Roy Johnsen

Om

Information about myself

After receiving a Dr.ing. degree from NTH in 1984, I joined Statoil Research Centre in Trondheim in 1985 to work within their “Material Technology” group. During this period I was involved in several research projects, material selection activities for new fields and failure analysis for existing fields. I also worked as Department Manager for some years.

In 1991 I joined CorrOcean in a combined management/technical position to develop the company from a small national company to be a leading international company within “Corrosion monitoring and corrosion management”. During my 13 years with CorrOcean the company grew from 30 people to 350 people with activities in all the major oil regions in the world. I also got the opportunity to visit the most important regions with oil activities in the world including Asia, Australia , South America, North America and Europe working with the leading oil companies and supplier industry. During my years in CorrOcean the company was listed on the Oslo Stock Exchange.

After 20 years in oil industry I accepted an offer to be a Professor within “Corrosion and Surface Technology” at IPM in 2004. I still have good contact with the industry and use my contact and experience to develop my courses and to get interesting industrial related projects both for master students and for PhD candidates.

I am present manager for the Strategic Area Materials (Tematisk Satsingsområde Materialer) at NTNU.

Fields of interest

Material technology for the oil industry
Corrosion of metallic materials for the process industry
Corrosion protection by cathodic protection and/or coating
Corrosion, erosion and wear resistant materials and surfaces
Tribology (including tribo-corrosion)
Integrity management of production systems
Hydrogen embrittlement of metals

Research

In the following is given a short presentation of the main research projects I’m involved in:

HISC - Hydrogen induced stress cracking of stainless steels (2005 – 2011) JIP sponsored by Statoil, ConocoPhillips, Total, Shell, Petrobras, Chevron and supply industry.

Prevention of hydrogen induced stress cracking (HISC) in subsea pipelines and production systems made from stainless steels (2006- 2012) Project sponsored by the Norwegian Research Council through the Petromaks program.

NODE Advanced Riser Tensioning project (2007-2010) Project sponsored by the Norwegian Research Council through the Petromaks program together with National Oilwell Varco, Aker Solutions Maritime Hydraulics, Bosch Rexroth, Umoe Mandal, Statoil.

Pulsed plasma surface treatment (PPST) – effect on hydrogen embrittlement and hydrogen absorption and diffusion (2009-2012)
JIP sponsored by Total, Aker Solutions, FMC Kongsberg and MoTECH Plasma.

Smartpipe (2006-2010)
Project sponsored by the Norwegian Research Council through the Petromaks program together with oil companies and service industry.

NOWITECH – Norwegian Research Centre for OffshoreWind (2009-2015)
FME sponsored by The Norwegian Research Council and the industry. Participating in activities related to optimization of maintenance including coating technology.

Courses

TMM4100/4105	Materialteknikk
TMM4170/TMT4255	Corrosion and corrosion protection
TMM4205	Tribology and Surface technology
TMM4535	Robust material selection and design – offshore applications

Publikasjoner

2024

Koren, Erik Aas; Yamabe, Junichiro; Lu, Xu; Hagen, Catalina Hoem Musinoi; Wang, Dong; Johnsen, Roy. (2024) Hydrogen diffusivity in X65 pipeline steel: Desorption and permeation studies. International Journal of Hydrogen Energy
Vitenskapelig artikkel
Deconinck, Liesbet; Lu, Xu; Wang, Dong; Johnsen, Roy; Verbeken, Kim; Depover, Tom. (2024) Hydrogen enhanced localised plasticity of single grain α titanium verified by in-situ hydrogen microcantilever bending. International Journal of Hydrogen Energy
Vitenskapelig artikkel
Lu, Xu; Johnsen, Roy. (2024) Hydrogen diffusion and uptake in nickel Alloy 625 under cathodic protection conditions. Heliyon
Vitenskapelig artikkel
Jemblie, Lise; Hagen, Anette Brocks; Hagen, Catalina Hoem Musinoi; Nyhus, Bård; Alvaro, Antonio; Wang, Dong. (2024) Safe pipelines for hydrogen transport. International Journal of Hydrogen Energy
Vitenskapelig artikkel
Deconinck, Liesbet; Lu, Xu; Wang, Dong; Johnsen, Roy; Verbeken, Kim; Depover, Tom. (2024) Multiscale evaluation of hydrogen-assisted mechanical degradation in grade 2 titanium. Journal of Alloys and Compounds
Vitenskapelig artikkel

2023

Karimi, Shabnam; Taji, Iman; Palencsar, Simona; Dugstad, Arne; Hajilou, Tarlan; Barnoush, Afrooz. (2023) Evaluation of microstructural and environmental effects on the hydrogen uptake and desorption in high-strength carbon steels: A thermal desorption spectroscopy study. Corrosion Science
Vitenskapelig artikkel
Lu, Xu; Kattuputhur Soundararajan, Chandrahaasan; Wang, Dong; Johnsen, Roy. (2023) Failure investigation of Alloy 725 drive screw. Technical report
Rapport
Karimi, Shabnam; Taji, Iman; Hajilou, Tarlan; Palencsar, Simona; Dugstad, Arne; Barnoush, Afrooz. (2023) Role of cementite morphology on corrosion layer formation of high-strength carbon steels in sweet and sour environments. Corrosion Science
Vitenskapelig artikkel
Lu, Xu; Ma, Yan; Ma, Yuan; Wang, Dong; Gao, Lei; Song, Wenwen. (2023) Unravelling the effect of F phase on hydrogen-assisted intergranular cracking in nickel-based Alloy 725: Experimental and DFT study. Corrosion Science
Vitenskapelig artikkel
Blücher, Daniel; Johnsen, Roy. (2023) Rustfritt stål er ikke alltid rustfritt. Teknisk Ukeblad
Kronikk
Koren, Erik Aas; Hagen, Catalina Hoem Musinoi; Wang, Dong; Lu, Xu; Johnsen, Roy; Yamabe, Junichiro. (2023) Experimental comparison of gaseous and electrochemical hydrogen charging in X65 pipeline steel using the permeation technique. Corrosion Science
Vitenskapelig artikkel
Koren, Erik Aas; Hagen, Catalina Hoem Musinoi; Wang, Dong; Lu, Xu; Johnsen, Roy. (2023) Investigating electrochemical charging conditions equivalent to hydrogen gas exposure of X65 pipeline steel. Materials and corrosion - Werkstoffe und Korrosion
Vitenskapelig artikkel
Vatn, Jørn; Johnsen, Roy. (2023) Kjernekraft. Det er fali’ det – eller?. Adressa/Midtnorskdebatt
Leserinnlegg
Olden, Vigdis; Johnsen, Roy; Jemblie, Lise; Hagen, Anette Brocks; Hagen, Catalina Hoem Musinoi; Zhang, Zhiliang. (2023) International Hydrogen and Materials Integrity Workshop 2023.
Annet produkt

2022

Lu, Xu; Wang, Dong; Wan, Di; Guo, Xiaofei; Johnsen, Roy. (2022) Reveal hydrogen behavior at grain boundaries in Fe-22Mn-0.6C TWIP steel via in-situ micropillar compression test. Acta Metallurgica Sinica (English Letters)
Vitenskapelig artikkel
Skilbred, Ellen Synnøve; Palencsar, Simona; Dugstad, Arne; Johnsen, Roy. (2022) Hydrogen uptake during active CO2-H2S corrosion of carbon steel wires in simulated annulus fluid. Corrosion Science
Vitenskapelig artikkel
Lu, Xu; Wang, Dong; Johnsen, Roy. (2022) Hydrogen diffusion and trapping in nickel-based alloy 625: An electrochemical permeation study. Electrochimica Acta
Vitenskapelig artikkel
Karimi, Shabnam; Taji, Iman; Hajilou, Tarlan; Barnoush, Afrooz; Johnsen, Roy. (2022) Evaluation of the cementite morphology influence on the hydrogen induced crack nucleation and propagation path in carbon steels. International Journal of Hydrogen Energy
Vitenskapelig artikkel
Maicas Esteve, Héctor; Taji, Iman; Wilms, Marc; Gonzalez-Garcia, Yaiza; Johnsen, Roy. (2022) Corrosion and Microstructural Investigation on Additively Manufactured 316L Stainless Steel: Experimental and Statistical Approach. Materials
Vitenskapelig artikkel
Taji, Iman; Hajilou, Tarlan; Karimi, Shabnam; Schott, Florian; Plesiutschnig, Ernst; Barnoush, Afrooz. (2022) Role of grain boundaries in hydrogen embrittlement of alloy 725: single and bi-crystal microcantilever bending study. International Journal of Hydrogen Energy
Vitenskapelig artikkel
Lu, Xu; Díaz, Andrés; Ma, Jun; Wang, Dong; He, Jianying; Zhang, Zhiliang. (2022) The effect of plastic deformation on hydrogen diffusion in nickel Alloy 625. Scripta Materialia
Vitenskapelig artikkel
Wang, Dong; Hagen, Anette Brocks; Undrum Fathi, Pernille; Lin, Meichao; Johnsen, Roy; Lu, Xu. (2022) Investigation of hydrogen embrittlement behavior in X65 pipeline steel under different hydrogen charging conditions. Materials Science & Engineering: A
Vitenskapelig artikkel
Lu, Xu; Ma, Yan; Peng, Ding; Johnsen, Roy; Wang, Dong. (2022) In situ nanomechanical characterization of hydrogen effects on nickel-based alloy 725 under different metallurgical conditions. Journal of Materials Science & Technology
Vitenskapelig artikkel
Taji, Iman; Hajilou, Tarlan; Ebner, Anna Sophie; Scheiber, Daniel; Karimi, Shabnam; Plesiutschnig, Ernst. (2022) Hydrogen assisted intergranular cracking of alloy 725: The effect of boron and copper alloying. Corrosion Science
Vitenskapelig artikkel
Hornus, Edgar; Vouilloz, Francisco; Long, Yu; Andersen, Kjetil; Krosness, Ola; King, Mike. (2022) Growth Kinetics of Calcareous Deposits on Thermally Sprayed Aluminum Coatings in Natural Seawater. Corrosion
Vitenskapelig artikkel
Lu, Xu; Depover, Tom; Johnsen, Roy. (2022) Evaluation of hydrogen diffusion and trapping in nickel Alloy 625 by thermal desorption spectroscopy. International Journal of Hydrogen Energy
Vitenskapelig artikkel
Bengtsson Blucher, Daniel; Knudsen, Ole Øystein; Brakstad, Odd Gunnar; Hakvåg, Sigrid; Johnsen, Roy. (2022) Korrosjon av Stål i Ferskvann. sintef as
Rapport

2021

Skilbred, Ellen Synnøve; Kappes, Mariano; Iannuzzi, Mariano; Johnsen, Roy. (2021) Hydrogen uptake and diffusivity in steel armor wires with different chemical composition, carbide distribution, grain size, and degree of deformation. Materials and corrosion - Werkstoffe und Korrosion
Vitenskapelig artikkel
Parow, Hanna; Johnsen, Roy; Skovhus, Torben Lund. (2021) MIC in the Fire Water Sprinkler System at St. Olavs Hospital, Trondheim, Norway. CRC Press
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
Wang, Dong; Hagen, Anette Brocks; Wan, Di; Lu, Xu; Johnsen, Roy. (2021) Probing hydrogen effect on nanomechanical properties of X65 pipeline steel using in-situ electrochemical nanoindentation. Materials Science & Engineering: A
Vitenskapelig artikkel
Wang, Dong; Lu, Xu; Lin, Meichao; Wan, Di; Li, Zhiming; He, Jianying. (2021) Understanding the hydrogen effect on pop-in behavior of an equiatomic high-entropy alloy during in-situ nanoindentation. Journal of Materials Science & Technology
Vitenskapelig artikkel
Wang, Dong; Lu, Xu; Wan, Di; Guo, Xiaofei; Johnsen, Roy. (2021) Effect of hydrogen on the embrittlement susceptibility of Fe-22Mn-0.6C TWIP steel revealed by in-situ tensile tests. Materials Science & Engineering: A
Vitenskapelig artikkel
Torres Rodriguez, Cristian; Johnsen, Roy; Iannuzzi, Mariano. (2021) Crevice corrosion of solution annealed 25Cr duplex stainless steels: Effect of W on critical temperatures. Corrosion Science
Vitenskapelig artikkel

2020

Skilbred, Ellen Synnøve; Lootz, Signe Aarthun; Johnsen, Roy. (2020) Hydrogen Embrittlement Susceptibility of Steel Armor Wires for Flexible Pipes. International Corrosion Conference Series
Vitenskapelig artikkel
Stenerud, Gaute; Hajilou, Tarlan; Olsen, Jim Stian; Taji, Iman; Barnoush, Afrooz; Johnsen, Roy. (2020) The Effect of Hydrogen on the Nanoindentation Behavior of Heat Treated 718 Alloy. Metals
Vitenskapelig artikkel
Lervik, Adrian; Walmsley, John; Lodgaard, Lars; Marioara, Calin Daniel; Johnsen, Roy; Lunder, Otto. (2020) Stress Corrosion Cracking in an Extruded Cu-Free Al-Zn-Mg Alloy. Metals
Vitenskapelig artikkel
Torres Rodriguez, Cristian; Hazarabedian, Maria Sofia; Quadir, Zakaria; Johnsen, Roy; Iannuzzi, Mariano. (2020) The Role of Tungsten on the Phase Transformation Kinetics and its Correlation with the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels. Journal of the Electrochemical Society
Vitenskapelig artikkel
Torres Rodriguez, Cristian; Iannuzzi, Mariano; Johnsen, Roy. (2020) Use of the Critical Acidification Model to Estimate the Influence of W in the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels. Metals
Vitenskapelig artikkel

2019

Kheradmand, Nousha; Rogne, Bjørn Rune Sørås; Dumoulin, Stephane; Deng, Yun; Johnsen, Roy; Barnoush, Afrooz. (2019) Small scale testing approach to reveal specific features of slip behavior in BCC metals. Acta Materialia
Vitenskapelig artikkel
Johnsen, Roy; Gjelseng, Linn Cecilie; Heimsæter, Martin Arne; Jernberg, Anders; Qvale, Atle H. (2019) Influence of Manufacturing Process and Resulting Microstructure on HISC Susceptibility of 25Cr Duplex Stainless Steel Pipe. International Corrosion Conference Series
Vitenskapelig artikkel
Wilson, Håvard; Johnsen, Roy; Torres Rodriguez, Cristian; Hesjevik, Sven Morten. (2019) Properties of TSA in natural seawater at ambient and elevated temperature. Materials and corrosion - Werkstoffe und Korrosion
Vitenskapelig artikkel
Stefansson, Njall; Dunn, John; Strand, Einar; Johnsen, Roy; Heimsæter, Martin Arne. (2019) Performance of high strength UNS N08830 in hydrogen stress crack testing to simulate conditions arising from subsea cathodic protection. International Corrosion Conference Series
Vitenskapelig artikkel
Ingdal, Mats; Johnsen, Roy; Harrington, David A.. (2019) The Akaike information criterion in weighted regression of immittance data. Electrochimica Acta
Vitenskapelig artikkel
Torres Rodriguez, Cristian; Johnsen, Roy; Østvold, Hege Kokslien; Bernås, Mia; Iannuzzi, Mariano. (2019) Effect ofW on Phase Transformation Kinetics and its Correlation with Localized Corrosion Resistance for UNS S39274. International Corrosion Conference Series
Vitenskapelig artikkel
Johnsen, Roy; Olavesen, Henrik Horten; Hossein Zavieh, Amin; Erlien, Tomas Laugsand. (2019) Effect of cathodic polarization on localized corrosion of 25Cr in seawater. International Corrosion Conference Series
Vitenskapelig artikkel

2018

Hajilou, Tarlan; Hope, Malin Sofie B.; Hossein Zavieh, Amin; Kheradmand, Nousha; Johnsen, Roy; Barnoush, Afrooz. (2018) In situ small-scale hydrogen embrittlement testing made easy: An electrolyte for preserving surface integrity at nano-scale during hydrogen charging. International Journal of Hydrogen Energy
Vitenskapelig artikkel
Johnsen, Roy; Lange, Torstein; Stenerud, Gaute; Olsen, Jim Stian. (2018) Environmentally assisted degradation of spinodal copper alloy C72900. Corrosion Science
Vitenskapelig artikkel
Ryen, Audun; Johnsen, Roy; Iannuzzi, Mariano; Årtun, Lars. (2018) Cathodic protection by distributed sacrificial anodes - Performance at elevated temperature and in mud. International Corrosion Conference Series
Vitenskapelig artikkel
Wold, Kristian; Johnsen, Roy; Iannuzzi, Mariano; Årtun, Lars. (2018) Integrated cathodic protection (CP) sensor network development of the CP sensor. International Corrosion Conference Series
Vitenskapelig artikkel
Stenerud, Gaute; Johnsen, Roy; Olsen, Jim Stian. (2018) Hydrogen stress cracking and crack initiation in precipitation hardened Ni-alloys. Engineering Failure Analysis
Vitenskapelig artikkel
Stenerud, Gaute; Wenner, Sigurd; Olsen, Jim Stian; Johnsen, Roy. (2018) Effect of different microstructural features on the hydrogen embrittlement susceptibility of alloy 718. International Journal of Hydrogen Energy
Vitenskapelig artikkel
Husby, Hans; Wagstaff, Philip Haakon; Iannuzzi, Mariano; Johnsen, Roy; Kappes, Mariano A. (2018) Effect of Nickel on the Hydrogen Stress Cracking Resistance of Ferritic/Pearlitic Low Alloy Steels. Corrosion
Vitenskapelig artikkel
Bernås, Mia; Westermann, Ida; Johnsen, Roy; Torres Rodriguez, Cristian; Jernberg, Anders; Qvale, Atle H. (2018) Effect of tungsten on the precipitation kinetics and localized corrosion resistance of super duplex stainless steels. International Corrosion Conference Series
Vitenskapelig artikkel
Krogstad, Hedda Nordby; Johnsen, Roy; Coey, Michael. (2018) Effect of a uniform magnetic field on corrosion of Ni-Al bronze in 3.5wt% NaCl. Corrosion
Vitenskapelig artikkel
Krogstad, Hedda Nordby; Johnsen, Roy; Coey, Michael. (2018) Effect of a time-dependent magnetic field on the corrosion of Ni-Al bronze. Corrosion
Vitenskapelig artikkel
Torres Rodriguez, Cristian; Kappes, Mariano A; Johnsen, Roy; Iannuzzi, Mariano. (2018) Influence of tungsten on passivity breakdown and repassivation of 25CR super duplex stainless steel. International Corrosion Conference Series
Vitenskapelig artikkel
Husby, Hans; Iannuzzi, Mariano; Johnsen, Roy; Mariano, Kappes; Barnoush, Afrooz. (2018) Effect of nickel on hydrogen permeation in ferritic/ pearlitic low alloy steels. International Journal of Hydrogen Energy
Vitenskapelig artikkel

2017

Iannuzzi, Mariano; Barnoush, Afrooz; Johnsen, Roy. (2017) Materials and corrosion trends in offshore and subsea oil and gas production. npj Materials Degradation
Vitenskapelig artikkel
Bernås, Mia; Westermann, Ida; Johnsen, Roy; Lauritsen, Christian; Iannuzzi, Mariano. (2017) Effect of microstructure on the corrosion resistance of duplex stainless steels: Materials performance maps. International Corrosion Conference Series
Vitenskapelig artikkel
Krogstad, Hedda Nordby; Johnsen, Roy. (2017) Corrosion properties of nickel-aluminium bronze in natural seawater?Effect of galvanic coupling to UNS S31603. Corrosion Science
Vitenskapelig artikkel
Haugan, Eirik; Næss, Monika; Torres Rodriguez, Cristian; Johnsen, Roy; Iannuzzi, Mariano. (2017) Effect of tungsten on the pitting and crevice corrosion resistance of Type 25Cr super duplex stainless steels. Corrosion
Vitenskapelig artikkel
Farhat, Hanan; Johnsen, Roy. (2017) Hydrogen sulfide tube failure in a seawater heat exchanger. Materials performance
Vitenskapelig artikkel
Stenerud, Gaute; Johnsen, Roy; Olsen, Jim Stian; He, Jianying; Barnoush, Afrooz. (2017) Effect of hydrogen on dislocation nucleation in alloy 718. International Journal of Hydrogen Energy
Vitenskapelig artikkel
Quale, Geir; Iannuzzi, Mariano; Johnsen, Roy. (2017) Cathodic protection by distributed sacrificial anodes - A new cost-effective solution to prevent corrosion of subsea structures. International Corrosion Conference Series
Vitenskapelig artikkel
Krogstad, Hedda Nordby; Skilbred, Ellen Synnøve; Johnsen, Roy. (2017) Corrosion of nickel aluminium bronze - Effect of alloying elements and pH. International Corrosion Conference Series
Vitenskapelig artikkel
Krogstad, Hedda Nordby; Johnsen, Roy; Coey, M. (2017) Corrosion of nickel aluminium bronze - Effect of a uniform magnetic field. International Corrosion Conference Series
Vitenskapelig artikkel
Johnsen, Roy; Nese, Ove. (2017) AA5083 and AA6082 exposed to seawater - Effect of potential on corrosion behaviour. International Corrosion Conference Series
Vitenskapelig artikkel

2016

Lange, Torstein; Bengtsson Blucher, Daniel; Venkataraman, Shankar; Jakobi, Dietinde; Asteman, Henrik; Johnsen, Roy. (2016) A new cast Ni-base alloy suitable for severe sour service. International Corrosion Conference Series
Vitenskapelig artikkel
Næss, Monika; Johnsen, Roy; Haugan, Eirik Bjørge; Iannuzzi, Mariano. (2016) Effect of tungsten on pitting and crevice corrosion of type 25Cr super duplex stainless steel. International Corrosion Conference Series
Vitenskapelig artikkel
Kheradmand, Nousha; Johnsen, Roy; Olsen, Jim Stian; Barnoush, Afrooz. (2016) Effect of Hydrogen on the hardness of different phases in super duplex stainless steel. International Journal of Hydrogen Energy
Vitenskapelig artikkel

2015

Næss, Monika E; Iannuzzi, Mariano; Johnsen, Roy. (2015) Use of electrochemical techniques to determine the effect of sigma (σ)-phase precipitation on a 25 wt% CR super duplex stainless steel. International Corrosion Conference Series
Vitenskapelig artikkel
Holager, Cathrine Selina; Johnsen, Roy; Nisancioglu, Kemal. (2015) Corrosion of thermally sprayed aluminum in flowing seawater. International Corrosion Conference Series
Vitenskapelig artikkel
Castberg, Tore Støren; Johnsen, Roy; Berget, J. (2015) Corrosion and subsequent erosion of hardmetals: Dependence of WC grain size and distribution, and binder composition. Materials and corrosion - Werkstoffe und Korrosion
Vitenskapelig artikkel
Stenerud, Gaute; Johnsen, Roy; Olsen, Jim Stian. (2015) Susceptibility to Hydrogen Induced Stress Cracking of UNS N07718 and UNS N07725 under cathodic polarization. International Corrosion Conference Series
Vitenskapelig artikkel

2011

Rommetveit, Tarjei; Johansen, Tonni Franke; Johnsen, Roy. (2011) Using a multi-layered transducer model to estimate the properties of paraffin wax deposited on steel. Ultrasonics
Vitenskapelig artikkel
Von der Ohe, Christian Bertil; Johnsen, Roy; Espallargas, Nuria. (2011) A multi-degradation test rig for studying the synergy effects of tribocorrosion interacting with 4-point static and cyclic bending. Wear
Vitenskapelig artikkel
Asgari, Masoud; Barnoush, Afrooz; Johnsen, Roy; Hoel, Rune. (2011) Microstructural characterization of pulsed plasma nitrided 316L stainless steel. Materials Science & Engineering: A
Vitenskapelig artikkel
Hörnlund, Erik; Ersdal, Gerhard; Hinderaker, Rolf H.; Johnsen, Roy; Sharp, John M.. (2011) Material Issues in Ageing and Life Extension (OMAE2011-49363). The American Society of Mechanical Engineers (ASME)
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
Johnsen, Roy. (2011) Tribocorrosion in Marine Environments. Woodhead Publishing Limited
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel

2010

Rommetveit, Tarjei; Johansen, Tonni Franke; Johnsen, Roy. (2010) A Combined Approach for High-Resolution Corrosion Monitoring and Temperature Compensation Using Ultrasound. IEEE Transactions on Instrumentation and Measurement
Vitenskapelig artikkel
Laustad, Gro; Johnsen, Roy; Asbjørnsen, Ingvild; Bjurstrøm, Martin; Hjorth, C.G. (2010) Resistance Toward Hydrogen-Induced Stress Cracking of Hot Isostatically Pressed Duplex Stainles Steel under Cathodic Protection. Corrosion
Vitenskapelig artikkel
Axelsen, Sten Bjarne; Johnsen, Roy; Knudsen, Ole Øystein. (2010) Adhesion Properties of Polysiloxane Topcoats. Corrosion
Vitenskapelig artikkel
Axelsen, Sten Bjarne; Johnsen, Roy; Knudsen, Ole Øystein. (2010) Internal Stress in Polysiloxane Topcoats. Corrosion
Vitenskapelig artikkel
Axelsen, Sten Bjarne; Johnsen, Roy; Knudsen, Ole Øystein. (2010) Mechanical Properties of Polysiloxane Topcoats. Corrosion
Vitenskapelig artikkel
von der Ohe, Christian B.; Johnsen, Roy; Espallargas, Nuria. (2010) Modeling the multi-degradation mechanisms of combined tribocorrosion interacting with static and cyclic loaded surfaces of passive metals exposed to seawater. Wear
Vitenskapelig artikkel
Axelsen, Sten Bjarne; Sjaastad, A; Knudsen, Ole Øystein; Johnsen, Roy. (2010) Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System-Part 3: A Case Study. Corrosion
Vitenskapelig artikkel
Axelsen, Sten Bjarne; Knudsen, Ole Øystein; Johnsen, Roy. (2010) Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System-Part 2: Framework Establishment. Corrosion
Vitenskapelig artikkel

2009

Olden, Vigdis; Thaulow, Christian; Johnsen, Roy; Østby, Erling; Berstad, Torodd. (2009) Influence of hydrogen from cathodic protection on the fracture susceptibility of 25%Cr duplex stainless steel - Constant load SENT testing and FE-modelling using hydrogen influenced cohesive zone elements. Engineering Fracture Mechanics
Vitenskapelig artikkel
Axelsen, Sten Bjarne; Knudsen, Ole Øystein; Johnsen, Roy. (2009) Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System - Part 1: Risk Analysis Methodology. Corrosion
Vitenskapelig artikkel
von der Ohe, Christian B.; Johnsen, Roy; Espallargas, Nuria. (2009) Hydraulic Cylinders for Offshore Splash Zone Operation: A Review of Piston Rod Failure Cases and Alternative Concepts.
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
Johnsen, Roy; Nyhus, Bård; Wästberg, Stig. (2009) Hydrogen Embrittlement of Stainless Steels Under Cathodic Protection in Seawater - Presentation of a New Test Method.
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel

2008

Olden, Vigdis; Thaulow, Christian; Johnsen, Roy. (2008) Modelling of hydrogen diffusion and hydrogen induced cracking in supermartensitic and duplex stainless steels. Materials & design
Vitenskapelig oversiktsartikkel/review
Olden, Vigdis; Thaulow, Christian; Johnsen, Roy; Østby, Erling; Berstad, Torodd. (2008) Application of hydrogen influenced cohesive laws in the prediction of hydrogen induced stress cracking in 25%Cr duplex stainless steel. Engineering Fracture Mechanics
Vitenskapelig artikkel

2007

Okstad, Trine; Rannestad, Øyvind; Johnsen, Roy; Nisancioglu, Kemal. (2007) Significance of hydrogen evolution during cathodic protection of carbon steel in Seawater. Corrosion
Vitenskapelig artikkel
Johnsen, Roy. (2007) Experience with the use of copper alloys in seawater systems on the Norwegian Continental Shelf. Woodhead Publishing Limited
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
Olden, Vigdis; Thaulow, Christian; Johnsen, Roy; Østby, Erling. (2007) Cohesive Zone Modeling of hydrogen-induced stress cracking in 25% Cr duplex stainless steel. Scripta Materialia
Vitenskapelig artikkel

2006

Johnsen, Roy; Gjerding-Smith, Knut; Lange, Hans Iver; Leinum, Bente; Gundersen, Gunnar; Isaksen, Bjørn. (2006) Wire fracture in locked coil cables. Bridge Structures - Assessment, Design and Construction
Vitenskapelig artikkel

Tidsskriftspublikasjoner

Koren, Erik Aas; Yamabe, Junichiro; Lu, Xu; Hagen, Catalina Hoem Musinoi; Wang, Dong; Johnsen, Roy. (2024) Hydrogen diffusivity in X65 pipeline steel: Desorption and permeation studies. International Journal of Hydrogen Energy
Vitenskapelig artikkel
Deconinck, Liesbet; Lu, Xu; Wang, Dong; Johnsen, Roy; Verbeken, Kim; Depover, Tom. (2024) Hydrogen enhanced localised plasticity of single grain α titanium verified by in-situ hydrogen microcantilever bending. International Journal of Hydrogen Energy
Vitenskapelig artikkel
Lu, Xu; Johnsen, Roy. (2024) Hydrogen diffusion and uptake in nickel Alloy 625 under cathodic protection conditions. Heliyon
Vitenskapelig artikkel
Jemblie, Lise; Hagen, Anette Brocks; Hagen, Catalina Hoem Musinoi; Nyhus, Bård; Alvaro, Antonio; Wang, Dong. (2024) Safe pipelines for hydrogen transport. International Journal of Hydrogen Energy
Vitenskapelig artikkel
Deconinck, Liesbet; Lu, Xu; Wang, Dong; Johnsen, Roy; Verbeken, Kim; Depover, Tom. (2024) Multiscale evaluation of hydrogen-assisted mechanical degradation in grade 2 titanium. Journal of Alloys and Compounds
Vitenskapelig artikkel
Karimi, Shabnam; Taji, Iman; Palencsar, Simona; Dugstad, Arne; Hajilou, Tarlan; Barnoush, Afrooz. (2023) Evaluation of microstructural and environmental effects on the hydrogen uptake and desorption in high-strength carbon steels: A thermal desorption spectroscopy study. Corrosion Science
Vitenskapelig artikkel
Karimi, Shabnam; Taji, Iman; Hajilou, Tarlan; Palencsar, Simona; Dugstad, Arne; Barnoush, Afrooz. (2023) Role of cementite morphology on corrosion layer formation of high-strength carbon steels in sweet and sour environments. Corrosion Science
Vitenskapelig artikkel
Lu, Xu; Ma, Yan; Ma, Yuan; Wang, Dong; Gao, Lei; Song, Wenwen. (2023) Unravelling the effect of F phase on hydrogen-assisted intergranular cracking in nickel-based Alloy 725: Experimental and DFT study. Corrosion Science
Vitenskapelig artikkel
Blücher, Daniel; Johnsen, Roy. (2023) Rustfritt stål er ikke alltid rustfritt. Teknisk Ukeblad
Kronikk
Koren, Erik Aas; Hagen, Catalina Hoem Musinoi; Wang, Dong; Lu, Xu; Johnsen, Roy; Yamabe, Junichiro. (2023) Experimental comparison of gaseous and electrochemical hydrogen charging in X65 pipeline steel using the permeation technique. Corrosion Science
Vitenskapelig artikkel
Koren, Erik Aas; Hagen, Catalina Hoem Musinoi; Wang, Dong; Lu, Xu; Johnsen, Roy. (2023) Investigating electrochemical charging conditions equivalent to hydrogen gas exposure of X65 pipeline steel. Materials and corrosion - Werkstoffe und Korrosion
Vitenskapelig artikkel
Vatn, Jørn; Johnsen, Roy. (2023) Kjernekraft. Det er fali’ det – eller?. Adressa/Midtnorskdebatt
Leserinnlegg
Lu, Xu; Wang, Dong; Wan, Di; Guo, Xiaofei; Johnsen, Roy. (2022) Reveal hydrogen behavior at grain boundaries in Fe-22Mn-0.6C TWIP steel via in-situ micropillar compression test. Acta Metallurgica Sinica (English Letters)
Vitenskapelig artikkel
Skilbred, Ellen Synnøve; Palencsar, Simona; Dugstad, Arne; Johnsen, Roy. (2022) Hydrogen uptake during active CO2-H2S corrosion of carbon steel wires in simulated annulus fluid. Corrosion Science
Vitenskapelig artikkel
Lu, Xu; Wang, Dong; Johnsen, Roy. (2022) Hydrogen diffusion and trapping in nickel-based alloy 625: An electrochemical permeation study. Electrochimica Acta
Vitenskapelig artikkel
Karimi, Shabnam; Taji, Iman; Hajilou, Tarlan; Barnoush, Afrooz; Johnsen, Roy. (2022) Evaluation of the cementite morphology influence on the hydrogen induced crack nucleation and propagation path in carbon steels. International Journal of Hydrogen Energy
Vitenskapelig artikkel
Maicas Esteve, Héctor; Taji, Iman; Wilms, Marc; Gonzalez-Garcia, Yaiza; Johnsen, Roy. (2022) Corrosion and Microstructural Investigation on Additively Manufactured 316L Stainless Steel: Experimental and Statistical Approach. Materials
Vitenskapelig artikkel
Taji, Iman; Hajilou, Tarlan; Karimi, Shabnam; Schott, Florian; Plesiutschnig, Ernst; Barnoush, Afrooz. (2022) Role of grain boundaries in hydrogen embrittlement of alloy 725: single and bi-crystal microcantilever bending study. International Journal of Hydrogen Energy
Vitenskapelig artikkel
Lu, Xu; Díaz, Andrés; Ma, Jun; Wang, Dong; He, Jianying; Zhang, Zhiliang. (2022) The effect of plastic deformation on hydrogen diffusion in nickel Alloy 625. Scripta Materialia
Vitenskapelig artikkel
Wang, Dong; Hagen, Anette Brocks; Undrum Fathi, Pernille; Lin, Meichao; Johnsen, Roy; Lu, Xu. (2022) Investigation of hydrogen embrittlement behavior in X65 pipeline steel under different hydrogen charging conditions. Materials Science & Engineering: A
Vitenskapelig artikkel
Lu, Xu; Ma, Yan; Peng, Ding; Johnsen, Roy; Wang, Dong. (2022) In situ nanomechanical characterization of hydrogen effects on nickel-based alloy 725 under different metallurgical conditions. Journal of Materials Science & Technology
Vitenskapelig artikkel
Taji, Iman; Hajilou, Tarlan; Ebner, Anna Sophie; Scheiber, Daniel; Karimi, Shabnam; Plesiutschnig, Ernst. (2022) Hydrogen assisted intergranular cracking of alloy 725: The effect of boron and copper alloying. Corrosion Science
Vitenskapelig artikkel
Hornus, Edgar; Vouilloz, Francisco; Long, Yu; Andersen, Kjetil; Krosness, Ola; King, Mike. (2022) Growth Kinetics of Calcareous Deposits on Thermally Sprayed Aluminum Coatings in Natural Seawater. Corrosion
Vitenskapelig artikkel
Lu, Xu; Depover, Tom; Johnsen, Roy. (2022) Evaluation of hydrogen diffusion and trapping in nickel Alloy 625 by thermal desorption spectroscopy. International Journal of Hydrogen Energy
Vitenskapelig artikkel
Skilbred, Ellen Synnøve; Kappes, Mariano; Iannuzzi, Mariano; Johnsen, Roy. (2021) Hydrogen uptake and diffusivity in steel armor wires with different chemical composition, carbide distribution, grain size, and degree of deformation. Materials and corrosion - Werkstoffe und Korrosion
Vitenskapelig artikkel
Wang, Dong; Hagen, Anette Brocks; Wan, Di; Lu, Xu; Johnsen, Roy. (2021) Probing hydrogen effect on nanomechanical properties of X65 pipeline steel using in-situ electrochemical nanoindentation. Materials Science & Engineering: A
Vitenskapelig artikkel
Wang, Dong; Lu, Xu; Lin, Meichao; Wan, Di; Li, Zhiming; He, Jianying. (2021) Understanding the hydrogen effect on pop-in behavior of an equiatomic high-entropy alloy during in-situ nanoindentation. Journal of Materials Science & Technology
Vitenskapelig artikkel
Wang, Dong; Lu, Xu; Wan, Di; Guo, Xiaofei; Johnsen, Roy. (2021) Effect of hydrogen on the embrittlement susceptibility of Fe-22Mn-0.6C TWIP steel revealed by in-situ tensile tests. Materials Science & Engineering: A
Vitenskapelig artikkel
Torres Rodriguez, Cristian; Johnsen, Roy; Iannuzzi, Mariano. (2021) Crevice corrosion of solution annealed 25Cr duplex stainless steels: Effect of W on critical temperatures. Corrosion Science
Vitenskapelig artikkel
Skilbred, Ellen Synnøve; Lootz, Signe Aarthun; Johnsen, Roy. (2020) Hydrogen Embrittlement Susceptibility of Steel Armor Wires for Flexible Pipes. International Corrosion Conference Series
Vitenskapelig artikkel
Stenerud, Gaute; Hajilou, Tarlan; Olsen, Jim Stian; Taji, Iman; Barnoush, Afrooz; Johnsen, Roy. (2020) The Effect of Hydrogen on the Nanoindentation Behavior of Heat Treated 718 Alloy. Metals
Vitenskapelig artikkel
Lervik, Adrian; Walmsley, John; Lodgaard, Lars; Marioara, Calin Daniel; Johnsen, Roy; Lunder, Otto. (2020) Stress Corrosion Cracking in an Extruded Cu-Free Al-Zn-Mg Alloy. Metals
Vitenskapelig artikkel
Torres Rodriguez, Cristian; Hazarabedian, Maria Sofia; Quadir, Zakaria; Johnsen, Roy; Iannuzzi, Mariano. (2020) The Role of Tungsten on the Phase Transformation Kinetics and its Correlation with the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels. Journal of the Electrochemical Society
Vitenskapelig artikkel
Torres Rodriguez, Cristian; Iannuzzi, Mariano; Johnsen, Roy. (2020) Use of the Critical Acidification Model to Estimate the Influence of W in the Localized Corrosion Resistance of 25Cr Super Duplex Stainless Steels. Metals
Vitenskapelig artikkel
Kheradmand, Nousha; Rogne, Bjørn Rune Sørås; Dumoulin, Stephane; Deng, Yun; Johnsen, Roy; Barnoush, Afrooz. (2019) Small scale testing approach to reveal specific features of slip behavior in BCC metals. Acta Materialia
Vitenskapelig artikkel
Johnsen, Roy; Gjelseng, Linn Cecilie; Heimsæter, Martin Arne; Jernberg, Anders; Qvale, Atle H. (2019) Influence of Manufacturing Process and Resulting Microstructure on HISC Susceptibility of 25Cr Duplex Stainless Steel Pipe. International Corrosion Conference Series
Vitenskapelig artikkel
Wilson, Håvard; Johnsen, Roy; Torres Rodriguez, Cristian; Hesjevik, Sven Morten. (2019) Properties of TSA in natural seawater at ambient and elevated temperature. Materials and corrosion - Werkstoffe und Korrosion
Vitenskapelig artikkel
Stefansson, Njall; Dunn, John; Strand, Einar; Johnsen, Roy; Heimsæter, Martin Arne. (2019) Performance of high strength UNS N08830 in hydrogen stress crack testing to simulate conditions arising from subsea cathodic protection. International Corrosion Conference Series
Vitenskapelig artikkel
Ingdal, Mats; Johnsen, Roy; Harrington, David A.. (2019) The Akaike information criterion in weighted regression of immittance data. Electrochimica Acta
Vitenskapelig artikkel
Torres Rodriguez, Cristian; Johnsen, Roy; Østvold, Hege Kokslien; Bernås, Mia; Iannuzzi, Mariano. (2019) Effect ofW on Phase Transformation Kinetics and its Correlation with Localized Corrosion Resistance for UNS S39274. International Corrosion Conference Series
Vitenskapelig artikkel
Johnsen, Roy; Olavesen, Henrik Horten; Hossein Zavieh, Amin; Erlien, Tomas Laugsand. (2019) Effect of cathodic polarization on localized corrosion of 25Cr in seawater. International Corrosion Conference Series
Vitenskapelig artikkel
Hajilou, Tarlan; Hope, Malin Sofie B.; Hossein Zavieh, Amin; Kheradmand, Nousha; Johnsen, Roy; Barnoush, Afrooz. (2018) In situ small-scale hydrogen embrittlement testing made easy: An electrolyte for preserving surface integrity at nano-scale during hydrogen charging. International Journal of Hydrogen Energy
Vitenskapelig artikkel
Johnsen, Roy; Lange, Torstein; Stenerud, Gaute; Olsen, Jim Stian. (2018) Environmentally assisted degradation of spinodal copper alloy C72900. Corrosion Science
Vitenskapelig artikkel
Ryen, Audun; Johnsen, Roy; Iannuzzi, Mariano; Årtun, Lars. (2018) Cathodic protection by distributed sacrificial anodes - Performance at elevated temperature and in mud. International Corrosion Conference Series
Vitenskapelig artikkel
Wold, Kristian; Johnsen, Roy; Iannuzzi, Mariano; Årtun, Lars. (2018) Integrated cathodic protection (CP) sensor network development of the CP sensor. International Corrosion Conference Series
Vitenskapelig artikkel
Stenerud, Gaute; Johnsen, Roy; Olsen, Jim Stian. (2018) Hydrogen stress cracking and crack initiation in precipitation hardened Ni-alloys. Engineering Failure Analysis
Vitenskapelig artikkel
Stenerud, Gaute; Wenner, Sigurd; Olsen, Jim Stian; Johnsen, Roy. (2018) Effect of different microstructural features on the hydrogen embrittlement susceptibility of alloy 718. International Journal of Hydrogen Energy
Vitenskapelig artikkel
Husby, Hans; Wagstaff, Philip Haakon; Iannuzzi, Mariano; Johnsen, Roy; Kappes, Mariano A. (2018) Effect of Nickel on the Hydrogen Stress Cracking Resistance of Ferritic/Pearlitic Low Alloy Steels. Corrosion
Vitenskapelig artikkel
Bernås, Mia; Westermann, Ida; Johnsen, Roy; Torres Rodriguez, Cristian; Jernberg, Anders; Qvale, Atle H. (2018) Effect of tungsten on the precipitation kinetics and localized corrosion resistance of super duplex stainless steels. International Corrosion Conference Series
Vitenskapelig artikkel
Krogstad, Hedda Nordby; Johnsen, Roy; Coey, Michael. (2018) Effect of a uniform magnetic field on corrosion of Ni-Al bronze in 3.5wt% NaCl. Corrosion
Vitenskapelig artikkel
Krogstad, Hedda Nordby; Johnsen, Roy; Coey, Michael. (2018) Effect of a time-dependent magnetic field on the corrosion of Ni-Al bronze. Corrosion
Vitenskapelig artikkel
Torres Rodriguez, Cristian; Kappes, Mariano A; Johnsen, Roy; Iannuzzi, Mariano. (2018) Influence of tungsten on passivity breakdown and repassivation of 25CR super duplex stainless steel. International Corrosion Conference Series
Vitenskapelig artikkel
Husby, Hans; Iannuzzi, Mariano; Johnsen, Roy; Mariano, Kappes; Barnoush, Afrooz. (2018) Effect of nickel on hydrogen permeation in ferritic/ pearlitic low alloy steels. International Journal of Hydrogen Energy
Vitenskapelig artikkel
Iannuzzi, Mariano; Barnoush, Afrooz; Johnsen, Roy. (2017) Materials and corrosion trends in offshore and subsea oil and gas production. npj Materials Degradation
Vitenskapelig artikkel
Bernås, Mia; Westermann, Ida; Johnsen, Roy; Lauritsen, Christian; Iannuzzi, Mariano. (2017) Effect of microstructure on the corrosion resistance of duplex stainless steels: Materials performance maps. International Corrosion Conference Series
Vitenskapelig artikkel
Krogstad, Hedda Nordby; Johnsen, Roy. (2017) Corrosion properties of nickel-aluminium bronze in natural seawater?Effect of galvanic coupling to UNS S31603. Corrosion Science
Vitenskapelig artikkel
Haugan, Eirik; Næss, Monika; Torres Rodriguez, Cristian; Johnsen, Roy; Iannuzzi, Mariano. (2017) Effect of tungsten on the pitting and crevice corrosion resistance of Type 25Cr super duplex stainless steels. Corrosion
Vitenskapelig artikkel
Farhat, Hanan; Johnsen, Roy. (2017) Hydrogen sulfide tube failure in a seawater heat exchanger. Materials performance
Vitenskapelig artikkel
Stenerud, Gaute; Johnsen, Roy; Olsen, Jim Stian; He, Jianying; Barnoush, Afrooz. (2017) Effect of hydrogen on dislocation nucleation in alloy 718. International Journal of Hydrogen Energy
Vitenskapelig artikkel
Quale, Geir; Iannuzzi, Mariano; Johnsen, Roy. (2017) Cathodic protection by distributed sacrificial anodes - A new cost-effective solution to prevent corrosion of subsea structures. International Corrosion Conference Series
Vitenskapelig artikkel
Krogstad, Hedda Nordby; Skilbred, Ellen Synnøve; Johnsen, Roy. (2017) Corrosion of nickel aluminium bronze - Effect of alloying elements and pH. International Corrosion Conference Series
Vitenskapelig artikkel
Krogstad, Hedda Nordby; Johnsen, Roy; Coey, M. (2017) Corrosion of nickel aluminium bronze - Effect of a uniform magnetic field. International Corrosion Conference Series
Vitenskapelig artikkel
Johnsen, Roy; Nese, Ove. (2017) AA5083 and AA6082 exposed to seawater - Effect of potential on corrosion behaviour. International Corrosion Conference Series
Vitenskapelig artikkel
Lange, Torstein; Bengtsson Blucher, Daniel; Venkataraman, Shankar; Jakobi, Dietinde; Asteman, Henrik; Johnsen, Roy. (2016) A new cast Ni-base alloy suitable for severe sour service. International Corrosion Conference Series
Vitenskapelig artikkel
Næss, Monika; Johnsen, Roy; Haugan, Eirik Bjørge; Iannuzzi, Mariano. (2016) Effect of tungsten on pitting and crevice corrosion of type 25Cr super duplex stainless steel. International Corrosion Conference Series
Vitenskapelig artikkel
Kheradmand, Nousha; Johnsen, Roy; Olsen, Jim Stian; Barnoush, Afrooz. (2016) Effect of Hydrogen on the hardness of different phases in super duplex stainless steel. International Journal of Hydrogen Energy
Vitenskapelig artikkel
Næss, Monika E; Iannuzzi, Mariano; Johnsen, Roy. (2015) Use of electrochemical techniques to determine the effect of sigma (σ)-phase precipitation on a 25 wt% CR super duplex stainless steel. International Corrosion Conference Series
Vitenskapelig artikkel
Holager, Cathrine Selina; Johnsen, Roy; Nisancioglu, Kemal. (2015) Corrosion of thermally sprayed aluminum in flowing seawater. International Corrosion Conference Series
Vitenskapelig artikkel
Castberg, Tore Støren; Johnsen, Roy; Berget, J. (2015) Corrosion and subsequent erosion of hardmetals: Dependence of WC grain size and distribution, and binder composition. Materials and corrosion - Werkstoffe und Korrosion
Vitenskapelig artikkel
Stenerud, Gaute; Johnsen, Roy; Olsen, Jim Stian. (2015) Susceptibility to Hydrogen Induced Stress Cracking of UNS N07718 and UNS N07725 under cathodic polarization. International Corrosion Conference Series
Vitenskapelig artikkel
Olden, Vigdis; Saai, Afaf; Jemblie, Lise; Johnsen, Roy. (2014) FE simulation of hydrogen diffusion in duplex stainless steel. International Journal of Hydrogen Energy
Vitenskapelig artikkel
Barnoush, Afrooz; Asgari, Masoud; Johnsen, Roy; Hoel, Rune. (2013) Hydrogen Effect on Nanomechanical Properties of the Nitrided Steel. Metallurgical and Materials Transactions A
Vitenskapelig artikkel
Asgari, Masoud; Barnoush, Afrooz; Johnsen, Roy; Hoel, Rune. (2013) Small-scale structural and mechanical characterization of the nitrided layer in martensitic steel. Tribology International
Vitenskapelig artikkel
Espallargas, Nuria; Johnsen, Roy; Torres, Christian Rodriguez; Igual Munoz, Anna. (2013) A new experimental technique for quantifying the galvanic coupling effects on stainless steel during tribocorrosion under equilibrium conditions. Wear
Vitenskapelig artikkel
Asgari, Masoud; Johnsen, Roy; Barnoush, Afrooz. (2013) Nanomechanical characterization of the hydrogen effect on pulsed plasma nitrided super duplex stainless steel. International Journal of Hydrogen Energy
Vitenskapelig artikkel
Baltzersen, Øystein; Johnsen, Roy; Martinussen, H; Nerbø, Ingar Stian. (2013) Using permanently installed ultrasound monitoring to maximize the lifetime of a pipeline. International Corrosion Conference Series
Vitenskapelig artikkel
Asgari, Masoud; S. Azar, Amin; Barnoush, Afrooz; Johnsen, Roy. (2013) Orientation Relationships and Texture of the Iron-Nitride Phase Constituents in Pulsed Plasma Nitriding. Metallurgical and Materials Transactions A
Vitenskapelig artikkel
Castberg, Tore Støren; Johnsen, Roy; Berget, John. (2013) Erosion of hardmetals: Dependence of WC grain size and distribution, and binder composition. Wear
Vitenskapelig artikkel
Von der Ohe, Christian Bertil; Johnsen, Roy; Espallargas, Nuria. (2012) Multi-degradation behavior of austenitic and super duplex stainless steel - The effect of 4-point static and cyclic bending applied to a simulated seawater tribocorrosion system. Wear
Vitenskapelig artikkel
Asgari, Masoud; Barnoush, Afrooz; Johnsen, Roy; Hoel, Rune. (2012) Nanomechanical evaluation of the protectiveness of nitrided layers against hydrogen embrittlement. Corrosion Science
Vitenskapelig artikkel
Barnoush, Afrooz; Asgari, Masoud; Johnsen, Roy. (2012) Resolving the hydrogen effect on dislocation nucleation and mobility by electrochemical nanoindentation. Scripta Materialia
Vitenskapelig artikkel
De Ridder, Karin; Pape, Kristine; Johnsen, Roy; Westin, Steinar; Holmen, Turid Lingaas; Bjørngaard, Johan Håkon. (2012) Adolescent health is associated with high school dropout, independent of parental socioeconomic status: a prospective population study, The Young-HUNT 1 study (Norway). European Journal of Public Health
Sammendrag/abstract
Rommetveit, Tarjei; Johansen, Tonni Franke; Johnsen, Roy. (2011) Using a multi-layered transducer model to estimate the properties of paraffin wax deposited on steel. Ultrasonics
Vitenskapelig artikkel
Von der Ohe, Christian Bertil; Johnsen, Roy; Espallargas, Nuria. (2011) A multi-degradation test rig for studying the synergy effects of tribocorrosion interacting with 4-point static and cyclic bending. Wear
Vitenskapelig artikkel
Asgari, Masoud; Barnoush, Afrooz; Johnsen, Roy; Hoel, Rune. (2011) Microstructural characterization of pulsed plasma nitrided 316L stainless steel. Materials Science & Engineering: A
Vitenskapelig artikkel
Rommetveit, Tarjei; Johansen, Tonni Franke; Johnsen, Roy. (2010) A Combined Approach for High-Resolution Corrosion Monitoring and Temperature Compensation Using Ultrasound. IEEE Transactions on Instrumentation and Measurement
Vitenskapelig artikkel
Laustad, Gro; Johnsen, Roy; Asbjørnsen, Ingvild; Bjurstrøm, Martin; Hjorth, C.G. (2010) Resistance Toward Hydrogen-Induced Stress Cracking of Hot Isostatically Pressed Duplex Stainles Steel under Cathodic Protection. Corrosion
Vitenskapelig artikkel
Axelsen, Sten Bjarne; Johnsen, Roy; Knudsen, Ole Øystein. (2010) Adhesion Properties of Polysiloxane Topcoats. Corrosion
Vitenskapelig artikkel
Axelsen, Sten Bjarne; Johnsen, Roy; Knudsen, Ole Øystein. (2010) Internal Stress in Polysiloxane Topcoats. Corrosion
Vitenskapelig artikkel
Axelsen, Sten Bjarne; Johnsen, Roy; Knudsen, Ole Øystein. (2010) Mechanical Properties of Polysiloxane Topcoats. Corrosion
Vitenskapelig artikkel
von der Ohe, Christian B.; Johnsen, Roy; Espallargas, Nuria. (2010) Modeling the multi-degradation mechanisms of combined tribocorrosion interacting with static and cyclic loaded surfaces of passive metals exposed to seawater. Wear
Vitenskapelig artikkel
Axelsen, Sten Bjarne; Sjaastad, A; Knudsen, Ole Øystein; Johnsen, Roy. (2010) Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System-Part 3: A Case Study. Corrosion
Vitenskapelig artikkel
Axelsen, Sten Bjarne; Knudsen, Ole Øystein; Johnsen, Roy. (2010) Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System-Part 2: Framework Establishment. Corrosion
Vitenskapelig artikkel
Olden, Vigdis; Thaulow, Christian; Johnsen, Roy; Østby, Erling; Berstad, Torodd. (2009) Influence of hydrogen from cathodic protection on the fracture susceptibility of 25%Cr duplex stainless steel - Constant load SENT testing and FE-modelling using hydrogen influenced cohesive zone elements. Engineering Fracture Mechanics
Vitenskapelig artikkel
Axelsen, Sten Bjarne; Knudsen, Ole Øystein; Johnsen, Roy. (2009) Protective Coatings Offshore: Introducing a Risk-Based Maintenance Management System - Part 1: Risk Analysis Methodology. Corrosion
Vitenskapelig artikkel
Olden, Vigdis; Thaulow, Christian; Johnsen, Roy. (2008) Modelling of hydrogen diffusion and hydrogen induced cracking in supermartensitic and duplex stainless steels. Materials & design
Vitenskapelig oversiktsartikkel/review
Olden, Vigdis; Thaulow, Christian; Johnsen, Roy; Østby, Erling; Berstad, Torodd. (2008) Application of hydrogen influenced cohesive laws in the prediction of hydrogen induced stress cracking in 25%Cr duplex stainless steel. Engineering Fracture Mechanics
Vitenskapelig artikkel
Okstad, Trine; Rannestad, Øyvind; Johnsen, Roy; Nisancioglu, Kemal. (2007) Significance of hydrogen evolution during cathodic protection of carbon steel in Seawater. Corrosion
Vitenskapelig artikkel
Olden, Vigdis; Thaulow, Christian; Johnsen, Roy; Østby, Erling. (2007) Cohesive Zone Modeling of hydrogen-induced stress cracking in 25% Cr duplex stainless steel. Scripta Materialia
Vitenskapelig artikkel
Johnsen, Roy; Gjerding-Smith, Knut; Lange, Hans Iver; Leinum, Bente; Gundersen, Gunnar; Isaksen, Bjørn. (2006) Wire fracture in locked coil cables. Bridge Structures - Assessment, Design and Construction
Vitenskapelig artikkel

Del av bok/rapport

Parow, Hanna; Johnsen, Roy; Skovhus, Torben Lund. (2021) MIC in the Fire Water Sprinkler System at St. Olavs Hospital, Trondheim, Norway. CRC Press
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
Perez Ramirez, Pedro Agustin; Johnsen, Roy; Utne, Ingrid Bouwer. (2012) Probabilistic condition assessment of aging equipment considering the effect of operating conditions and maintenance. The American Society of Mechanical Engineers (ASME)
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
Hörnlund, Erik; Ersdal, Gerhard; Hinderaker, Rolf H.; Johnsen, Roy; Sharp, John M.. (2011) Material Issues in Ageing and Life Extension (OMAE2011-49363). The American Society of Mechanical Engineers (ASME)
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
Johnsen, Roy. (2011) Tribocorrosion in Marine Environments. Woodhead Publishing Limited
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
von der Ohe, Christian B.; Johnsen, Roy; Espallargas, Nuria. (2009) Hydraulic Cylinders for Offshore Splash Zone Operation: A Review of Piston Rod Failure Cases and Alternative Concepts.
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
Johnsen, Roy; Nyhus, Bård; Wästberg, Stig. (2009) Hydrogen Embrittlement of Stainless Steels Under Cathodic Protection in Seawater - Presentation of a New Test Method.
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel
Johnsen, Roy. (2007) Experience with the use of copper alloys in seawater systems on the Norwegian Continental Shelf. Woodhead Publishing Limited
Vitenskapelig Kapittel/Artikkel/Konferanseartikkel

Rapport

Lu, Xu; Kattuputhur Soundararajan, Chandrahaasan; Wang, Dong; Johnsen, Roy. (2023) Failure investigation of Alloy 725 drive screw. Technical report
Rapport
Bengtsson Blucher, Daniel; Knudsen, Ole Øystein; Brakstad, Odd Gunnar; Hakvåg, Sigrid; Johnsen, Roy. (2022) Korrosjon av Stål i Ferskvann. sintef as
Rapport
Brataas, Arne; Mathiesen, Ragnvald; Grande, Tor; Roven, Hans Jørgen; Grepstad, Jostein; Echtermeyer, Andreas. (2013) Enabling technologies at NTNU; materials science and engineering. NTNU
Rapport

PRODUKT

Olden, Vigdis; Johnsen, Roy; Jemblie, Lise; Hagen, Anette Brocks; Hagen, Catalina Hoem Musinoi; Zhang, Zhiliang. (2023) International Hydrogen and Materials Integrity Workshop 2023.
Annet produkt

Undervisning

Emner

Formidling

2024

Vitenskapelig foredrag

Lu, Xu; Johnsen, Roy. (2024) Hydrogen embrittlement in Ni alloys: some insights. ECF conference 2024 2024-08-26 - 2024-08-30
Vitenskapelig foredrag

Lu, Xu; Johnsen, Roy. (2024) Hydrogen embrittlement in Ni alloys: some insights. Hydrogenius Symposium 2024-09-12 - 2024-09-13
Vitenskapelig foredrag

Jemblie, Lise; Alvaro, Antonio; Hagen, Catalina Hoem Musinoi; Hagen, Anette Brocks; Nyhus, Bård; Johnsen, Roy. (2024) Safe pipelines for hydrogen transport - results from the HyLINE project. Centre for Environment-friendly Research (FME) HYDROGENi H2Science , Trondheim 2024-06-18 - 2024-06-19
Vitenskapelig foredrag

Hagen, Catalina Hoem Musinoi; Koren, Erik Halås; Knudsen, Ole Øystein; Hagen, Anette Brocks; Nyhus, Bård; Jemblie, Lise. (2024) Hydrogen embrittlement testing: electrochemical versus hydrogen gas charging. European Federation of Corrosion EUROCORR 2024 , Paris 2024-09-01 - 2024-09-05
Vitenskapelig foredrag

Hagen, Catalina Hoem Musinoi; Koren, Erik Halås; Knudsen, Ole Øystein; Hagen, Anette Brocks; Nyhus, Bård; Jemblie, Lise. (2024) Exploring Electrochemical Charging: A Potential Substitute for Hydrogen Gas in Hydrogen Embrittlement Testing?. Centre for Environmental friendly Research (FME) HYDROGENi H2 Science , Oslo 2024-06-17 - 2024-06-18
Vitenskapelig foredrag

Jemblie, Lise; Hagen, Catalina Hoem Musinoi; Nyhus, Bård; Alvaro, Antonio; Johnsen, Roy; Zhang, Zhiliang. (2024) Safe pipelines for hydrogen transport. VTT International seminar: Hydrogen & Materials 2024 , Espoo, Finland 2024-06-06 - 2024-06-07
Vitenskapelig foredrag

Jemblie, Lise; Hagen, Catalina Hoem Musinoi; Johnsen, Roy; Nyhus, Bård; Alvaro, Antonio; Olden, Vigdis. (2024) Safe pipelines for Hydrogen Transport. Electric Power Research Institute - EPRI HydrogenEmbrittlement Workshop , University of Oxford 2024-06-23 - 2024-06-26
Faglig foredrag

Endrös, Paula; Johnsen, Roy; Razavi, Nima; Lu, Xu. (2024) Hydriding behavior in Ti-6Al-4V manufactured with electron beam powder bed fusion (PBF-EB) . MSE 2024 Congress - Materials Science and Engineering 2024-09-24 - 2024-09-26
Faglig foredrag

Endrös, Paula; Razavi, Nima; Johnsen, Roy; Lu, Xu. (2024) Hydrogen embrittlement of Ti-6Al-4V manufactured with electron beam powder bed fusion (PBF-EB) . European Conference on Fracture 2024 2024-08-26 - 2024-08-30
Vitenskapelig foredrag

Deconinck, Liesbet; Ferreiros, Pedro A.; Que, Zaiqing; Johnsen, Roy; Lu, Xu. (2024) The role of martensite in hydrogen embrittlement of post-processed 316L stainless steel. ESIS European Conference on Fracture 2024 , Zagreb (Croatia) 2024-08-26 - 2024-08-30
Poster

Deconinck, Liesbet; Ferreiros, Pedro A.; Que, Zaiqing; Johnsen, Roy; Lu, Xu. (2024) Hydrogen embrittlement of post-processed laser powder bed fused 316L stainless steel. Kyushu University Hydrogenius Symposium 2024 , Fukuoka (Japan) 2024-09-12 - 2024-09-13

2023

Vitenskapelig foredrag

Olden, Vigdis; Alvaro, Antonio; Nyhus, Bård; Hagen, Anette Brocks; Johnsen, Roy; Di, Wan. (2023) Hydrogen embrittlement in subsea pipelines - From natural gas to hydrogen gas transport. Engineering Conferences International International Hydrogen Conference 2023 , Park City, Utah, USA 2023-09-17 - 2023-09-21
Vitenskapelig foredrag

Koren, Erik Aas; Hagen, Catalina Hoem Musinoi; Wang, Dong; Lu, Xu; Johnsen, Roy; Yamabe, Junichiro. (2023) Hydrogen diffusion in X65 pipeline steels. SINTEF/NTNU/Kyushu University SNEAC - Environmental assisted cracking workshop , Trondheim 2023-06-06 - 2023-06-08
Vitenskapelig foredrag

Johnsen, Roy; Koren, Erik Aas; Hagen, Catalina Hoem Musinoi; Lu, Xu; Wang, Dong. (2023) Main take aways from the HYLINE project WP1 - Relationship between gaseous and electrochemical hydrogen charging of X65 pipeline steel using the permeation technique. SINTEF INDUSTRI og NTNU SNEAC II - NTNU/SINTEF , Trondheim 2023-06-07 - 2023-06-08
Vitenskapelig foredrag

Lu, Xu; Ma, Yan; Ma, Yuan; Johnsen, Roy. (2023) H-assisted failure in nickel alloys and possible mitigation approaches . 19th Asian Pacific Corrosion Control Conference 2023-11-17 - 2023-11-18
Vitenskapelig foredrag

Sharma, Suraksha; Bjerk, Christoffer; Geiker, Mette Rica; Hornbostel, Karla; Osmolska, Magdalena Jadwiga; Danner, Tobias. (2023) Inspections and Investigations on Herøysund Bridge, 2023. UiT HERØY FoU: 2023 PLENARY MEETING , Narvik 2023-12-05 - 2023-12-06

2022

Vitenskapelig foredrag

Johnsen, Roy; Djupvik, Veronika; Hartung, Cathrine; Qvale, Atle Helge; Westermann, Ida. (2022) The Susceptibility of Spheroidal Graphite Cast Iron to Hydrogen Induced Stress Cracking. Association for Materials Protection and Performance (AMPP) AMPP Corrosion , San Antonio, Texas 2022-03-06 - 2022-03-10
Vitenskapelig foredrag

Nyhus, Bård; Alvaro, Antonio; Myhre, Aleksander Omholt; Hagen, Anette Brocks; Wang, Dong; Koren, Erik Aas. (2022) Hydrogen-materials research on the influence of pressurized H2 gas on pipeline steel - Recent results from the HyLINE project. Norsk Petroleumsforening Subsea Pipelines & Cables , Trondheim 2022-10-11 - 2022-10-12
Vitenskapelig foredrag

Lu, Xu; Johnsen, Roy. (2022) Hydrogen diffusion and uptake in nickel Alloy 625 . Eurocorr Conference , Berlin 2022-08-28 - 2022-09-01
Vitenskapelig foredrag

Lu, Xu; Johnsen, Roy. (2022) Hydrogen diffusion and uptake in nickel alloy 625. Nasjonal konferanse for materialteknologi , Oslo 2022-06-01 - 2022-06-02
Vitenskapelig foredrag

Johnsen, Roy. (2022) Hydrogen uptake and embrittlement of X65 pipeline steel. Qatar Environment and Energy Research Institute (QEERI) Material Science day at Qatar Environment and Energy Research Institute (QEERI) , Doha, Qatar 2022-09-15 - 2022-09-15
Faglig foredrag

Johnsen, Roy; Salasi, Mobin; Iannizzi, Mariano; Andersen, Kjetil; Krosness, Ola. (2022) Calcareous deposition on thermally sprayed aluminum surfaces. Association for Materials Protection and Performance (AMPP) AMPP Corrosion , San Antonio, Texas 2022-03-05 - 2022-03-10
Faglig foredrag

Johnsen, Roy; Torres, Cristian; Skar, Jan-Ivar; Duparc, Marion; Hesjevik, Sven Morten. (2022) Determination of oxygen limits for corrosion resistant alloys (CRAs) in oil & gas produced water based on electrochemical test methods Part 1: Crevice corrosion and repassivation potentials without oxygen. Association for Materials Protection and Performance (AMPP) AMPP Corrosion , San Antonio, Texas 2022-03-06 - 2022-03-10
Faglig foredrag

Johnsen, Roy; Duparc, Marion; Skar, Jan-Ivar; Saxegård, Tov Eivind. (2022) Determination of Oxygen Limits for Corrosion Resistant Alloys (CRAs) in Oil & Gas Produced Water Based on Electrochemical Test Methods – Part 2. Association for Materials Protection and Performance (AMPP) AMPP Corrosion , San Antonio, Texas 2022-03-05 - 2022-03-10
Vitenskapelig foredrag

Lu, Xu; Johnsen, Roy. (2022) H-assisted failure in nickel alloys and possible mitigation approach. Swerim 4th Sweden hydrogen seminar 2022-10-27 - 2022-10-27
Vitenskapelig foredrag

Lu, Xu; Johnsen, Roy. (2022) Hydrogen diffusion and trapping in nickel Alloys 625 and 725. NTNU HEiNS symposium , Trondheim 2022-12-05 - 2022-12-06
Vitenskapelig foredrag

Olden, Vigdis; Vinogradov, Alexei; Johnsen, Roy; Zhang, Zhiliang; Alvaro, Antonio; Hagen, Catalina Hoem Musinoi. (2022) Hydrogen embrittlement resistance of X65 pipeline steels - Results from the HyLINE project. HYDROGENIUS, I2CNER, HYDROMATE AND SINTEF HYDROGEN-MATERIALS INTERACTIONS - HYDROGENIUS, I2CNER, HYDROMATE AND SINTEF JOINT RESEARCH SYMPOSIUM 2022 , Fukuoka, Kyushu Universitet 2022-01-27 - 2022-01-28
Faglig foredrag

Olden, Vigdis; Vinogradov, Alexei; Johnsen, Roy; Zhang, Zhiliang; Alvaro, Antonio; Hagen, Catalina Hoem Musinoi. (2022) Hydrogen embrittlement resistance of X65 pipeline steel – recent results from the HyLINE project. Norsk Forening for vedlikehold Robust materialvalg i energisektoren , Quality Hotel Olavsgaard, Skjetten 2022-04-04 - 2022-04-05
Vitenskapelig foredrag

Koren, Erik Aas; Hagen, Catalina Hoem Musinoi; Wang, Dong; Lu, Xu; Johnsen, Roy; Yamabe, Junichiro. (2022) Experimental comparison of gaseous and electrochemical hydrogen charging in a X65 pipeline steel using the permeation technique. European Federation of Corrosion EUROCORR2022 , Berlin, Tyskland 2022-08-28 - 2022-09-01
Vitenskapelig foredrag

Koren, Erik Aas; Hagen, Catalina Hoem Musinoi; Wang, Dong; Lu, Xu; Johnsen, Roy; Yamabe, Junichiro. (2022) Correlating electrochemical and gaseous hydrogen charging of a X65 pipeline steel by the permeation technique. European Structural Integrity Society ECF23, European Conference on Fracture 2022 , Madeira, Portugal 2022-06-27 - 2022-07-01
Vitenskapelig foredrag

Alvaro, Antonio; Myhre, Aleksander Omholt; Olden, Vigdis; Hagen, Anette Brocks; Wang, Dong; Nyhus, Bård. (2022) Mechanical performance of subsea pipeline steels for hydrogen transport application. OCAS International Conference on Metals and Hydrogen , Ghent 2022-10-11 - 2022-10-13

2021

Vitenskapelig foredrag

Lu, Xu; Johnsen, Roy. (2021) Effect of temperature on hydrogen uptake in nickel alloy 625. Academic Seminar on the M-HEAT project 2021-10-12 - 2021-10-12
Vitenskapelig foredrag

Lu, Xu; Johnsen, Roy. (2021) Study on hydrogen trapping and diffusion in nickel alloys. NTNU Academic Seminar on the M-HEAT project , NTNU 2021-06-15 - 2021-06-15
Vitenskapelig foredrag

Lu, Xu; Johnsen, Roy. (2021) Evaluation of hydrogen diffusion behavior in nickel alloy 625. NTNU Academic Seminar on the M-HEAT project , NTNU 2021-03-23 - 2021-03-23
Faglig foredrag

Johnsen, Roy; Eriksen, Kristian; Hauger, Stian. (2021) Welding of CRA with insufficient purging gas Impact on mechanical properties and corrosion resistance. NACE International/AMMP NACE Corrosion 2021 , Salt Lake City, USA 2021-04-19 - 2022-01-30
Vitenskapelig foredrag

Hagen, Catalina Hoem Musinoi; Knudsen, Ole Øystein; Johnsen, Roy; Pfleging, Wilhelm. (2021) Oxidation of coated steel during exposure to humid air and effects on cathodic disbonding. EUROCORR 2021 2021-09-20 - 2021-09-24

2017

Vitenskapelig foredrag

Johnsen, Roy. (2017) Hydrogen Induced Stress Cracking of Stainless Steel in Seawater – what do we know and what is still unknown?. European Federation of Corrosion EUROCORR 2017 , Praha 2017-07-03 - 2017-07-07

2016

Vitenskapelig foredrag

Bernås, Mia; Westermann, Ida; Johnsen, Roy; Iannuzzi, Mariano. (2016) Microstructural evolution during isothermal heat treatment of a W-rich super duplex stainless steel. Norsk Materialteknisk Selskap/Norsk Metallografisk Forening Nasjonal Konferanse for Materialteknologi , Trondheim 2016-08-24 - 2016-08-25
Vitenskapelig foredrag

Johnsen, Roy; Stenerud, Gaute; Barnoush, Afrooz; Olsen, Jim Stian. (2016) In Situ Electrochemical Nanoindentation of Alloy 718. European Federation of Corrosion EUROCORR 2016 , Montpellier 2016-09-11 - 2016-09-15
Vitenskapelig foredrag

Johnsen, Roy; Lange, Torstein; Olsen, Jim Stian. (2016) Susceptibility to hydrogen embrittlement for C72900 exposed to H2S environment and under cathodic polarization in simulated seawater. European Federation of Corrosion EUROCORR 2016 , Montpellier 2016-09-11 - 2016-09-15
Vitenskapelig foredrag

Venkataraman, Shankar; Bengtsson Blucher, Daniel; Jakobi, Dietinde; Asteman, Dr. Henrik; Johnsen, Roy; Lange, Torstein. (2016) A New Cast Ni-Base Alloy Suitable for Severe Sour Service. Nace International NACE International Corrosion 2016 Conference & Expo , Vancouver 2016-03-06 - 2016-03-10
Vitenskapelig foredrag

Johnsen, Roy. (2016) Hydrogen Induced Stress Cracking of Duplex Stainless Steel under Cathodic Protection in Seawater – Historical overview and Lessons Learned. ACerS, AIST, ASM International, TMS, NACE International Material Science & TEchnology 2016 , Salt Lake City 2016-10-23 - 2016-10-27
Vitenskapelig foredrag

Bengtsson Blucher, Daniel; Lange, Torstein; Venkataraman, Shankar; Asteman, Henrik; Jakobi, Dietlinde; Johnsen, Roy. (2016) A new centrifugally cast austenitic Ni-base alloy suitable for severe sour service heavy wall thickness piping application. EUROCORR 2016 2016-09-11 - 2016-09-15
Vitenskapelig foredrag

Johnsen, Roy; husby, hans; Barnoush, Afrooz; Iannuzzi, Mariano. (2016) Effect of nickel in solid solution on hydrogen transport kinetics in low alloy steels. European Federation of Corrosion EUROCORR/16 , Montpellier 2016-09-11 - 2016-09-15
Vitenskapelig foredrag

Olden, Vigdis; Johnsen, Roy; Zhang, Zhiliang. (2016) Hydrogen induced stress cracking (HISC) . SINTEF og NTNU SINTEF and NTNU's Environmental Assisted Cracking workshop - SNEAC , Trondheim 2016-06-08 - 2016-06-10
Vitenskapelig foredrag

Johnsen, Roy; Iannuzzi, Mariano; Haugan, Eirik; Næss, Monika E. (2016) Effect of Tungsten on Pitting and Crevice Corrosion of type 25Cr Super Duplex Stainless Steel. NACE International NACE International Corrosion 2016 Conference & Expo , Vancouver 2016-03-06 - 2016-03-10
Vitenskapelig foredrag

Krogstad, Hedda Nordby; Johnsen, Roy. (2016) The effect of a Magnetic Field on the Galvanic corrosion of NiAlBronze in Natural Seawater. NACE International NACE International Corrosion 2016 Conference & Expo , Vancouver 2016-03-06 - 2016-06-10
Faglig foredrag

Johnsen, Roy; Iannuzzi, Mariano. (2016) Distributed Sacrificial Anode (DSA) – a new cost effective solution for corrosion protection of structures in seawater . Norsk Korrosjonsteknisk Forening, Stavanger avdeling Materialdagen , Stavanger 2016-06-02 - 2016-06-03

2015

Vitenskapelig foredrag

Holager, Cathrine Selina; Johnsen, Roy; Nisancioglu, Kemal. (2015) Corrosion of Thermally Sprayed Aluminum in Flowing Seawater. NACE International NACE Corrosion 2015 , Dallas, Texas 2015-03-15 - 2015-03-19
Faglig foredrag

Kheradmand, Nousha; Johnsen, Roy; Barnoush, Afrooz. (2015) Hydrogen Embrittlement in Advanced Materials for Oil and Gas Industry: A Nanomechanical Approach. TMS 2015, 144th Annual Meeting and Exhibition 2015-03-15 - 2015-03-19
Faglig foredrag

Kheradmand, Nousha; Hajilou, Tarlan; Deng, Yun; Johnsen, Roy; Barnoush, Afrooz. (2015) In situ electrochemical-micro-compression test: An investigation of dislocation-grain boundary interaction in presence of hydrogen. TMS 2015, 144th Annual Meeting and Exhibition 2015-03-15 - 2015-03-19
Vitenskapelig foredrag

Iannuzzi, Mariano; Johnsen, Roy; Næss, Monika E. (2015) Use of electrochemical techniques to determine the degree of σ-phase precipitation in Type 25Cr SDSS. NACE International CORROSION/15 , Dallas 2015-03-16 - 2015-03-19
Vitenskapelig foredrag

Iannuzzi, Mariano; Johnsen, Roy; Næss, Monika E. (2015) Use of electrochemical techniques to determine localized corrosion resistance of 25-wt% Cr Super Duplex Stainless Steels. Norwegian Corrosion Society 16th Nordic Corrosion Congress , Stavanger 2015-05-20 - 2015-05-22
Vitenskapelig foredrag

Johnsen, Roy. (2015) Corrosion and hydrogen embrittlement in production systems – effect on process safety. College of North Atlantic Qatar Qatar Process Safety Symposium “Successfully Managing Changes for a safer future , Doha 2015-03-30 - 2015-03-31
Vitenskapelig foredrag

Johnsen, Roy. (2015) Corrosion Challenges for the oil and gas industry in the State of Qatar. TMS TMS Middle East – Mediterranean Materials Congress and Energy and Infrastructure Systems (MEMA 2015). , Doha 2015-01-11 - 2015-01-14

2014

Vitenskapelig foredrag

Holager, Cathrine Selina; Johnsen, Roy; Nisancioglu, Kemal. (2014) Corrosion of Thermally Sprayed Aluminium in Flowing Seawater. European Federation of Chemical Engineering 10th European Symposium on Electrochemical Engineering , Cagliari 2014-09-28 - 2014-10-02
Vitenskapelig foredrag

Olden, Vigdis; Saai, Afaf; Jemblie, Lise; Johnsen, Roy. (2014) A finite element study of hydrogen diffusion in duplex stainless steel. Lode Duprez, Department Manager Metallurgy at OCAS, Zelzate Steel & Hydrogen Conference 2014 , Gent 2014-05-05 - 2014-05-07
Vitenskapelig foredrag

Johnsen, Roy. (2014) Hydrogen embrittlement of corrosion resistant alloys in oil/gas environment. Texas A&M Qatar Oryx GTL Excellence Series in Chemical Engineering , Doha 2014-02-18 - 2014-02-18
Vitenskapelig foredrag

Andersen, Kjetil; Johnsen, Roy; Olsen, Jim Stian. (2014) Effect of grain size on HISC resistance in 25% Cr super duplex stainless steels. ESIS EFC20 , TRONDHEIM 2014-06-30 - 2014-07-04
Vitenskapelig foredrag

Wesmann, Johan Andre; Johnsen, Roy; Espallargas, Nuria; Herland, j; Twist, Dag; Araki, H. (2014) Investigation of oxide formation on sliding interfaces of WC-CoCr in relation to friction and wear. Foredrag - proceedings 2014-05-21 - 2014-05-23

2013

Vitenskapelig foredrag

Wesmann, Johan Andre; Herland, j; Twist, Dag; Johnsen, Roy; Espallargas, Nuria. (2013) Influence of environmental conditions on friction of WC-CoCr coatings. World Tribology Conference 2013 2013-09-08 - 2013-09-13
Vitenskapelig foredrag

Wesmann, Johan Andre; Twist, Dag; Johnsen, Roy; Espallargas, Nuria. (2013) Friction and wear of coatings for subsea valves. International Thermal Spray Conference 2013 2013-05-13 - 2013-05-15
Vitenskapelig foredrag

Wesmann, Johan Andre; Herland, j; Twist, Dag; Johnsen, Roy; Espallargas, Nuria. (2013) FRICTION EVOLUTION OF WC-CoCr THERMALLY SPRAYED COATINGS DURING DRY SLIDING IN DIFFERENT ENVIRONMENTS. International Tribology Symposium of IFToMM 2013-03-19 - 2013-03-21
Vitenskapelig foredrag

Barnoush, Afrooz; Zamanzade, Mohammad; Asgari, Masoud; Johnsen, Roy; Vehoff, Horst. (2013) Hydrogen embrittlement revisited by novel nanomechanical approach. German physic society (DPG) DPG Spring Meeting of the Condensed Matter Section , Regensburg 2013-03-10 - 2013-03-15
Vitenskapelig foredrag

Lange, Hans Iver; Johnsen, Roy; Gundersen, Gunnar. (2013) Sensitivity for fracture from defects in wires of bridge suspension cables. The 8th International cable supported bridge operators' conference, Edinburgh, Scotland 2013-06-03 - 2013-06-05

2012

Vitenskapelig foredrag

Espallargas, Nuria; von der Ohe, Christian B.; Johnsen, Roy. (2012) Effect of fatigue on tribocorrosion of passive materials used in offshore drilling applications – new test rig combining cyclic/static bending and tribocorrosion. foredrag 2012-04-19 - 2012-04-20
Vitenskapelig foredrag

Johnsen, Roy. (2012) Hydrogen embrittlement of carbon steel and stainless steel. Qatar University and Texas A&M Materials and Science Engineering Symposium 2012 , Doha 2012-02-28 - 2012-02-28
Populærvitenskapelig foredrag

Johnsen, Roy. (2012) Corrosion and corrosion fatigue properties of aluminium components – Focus on oil & gas. Qatar University Aluminium Workshop , Doha 2012-05-12 - 2012-05-12
Vitenskapelig foredrag

Perez Ramirez, Pedro Agustin; Johnsen, Roy; Utne, Ingrid Bouwer. (2012) Probabilistic condition assessment of aging equipment considering the effect of operating conditions and maintenance. 31st International Conference on Ocean, Offshore and Arctic Engineering (OMAE 2012) , Rio de Janeiro 2012-07-01 - 2012-07-06

2011

Vitenskapelig foredrag

Mubarok, Fahmi; Puranen, Jouni; Vuoristo, Petri; Johnsen, Roy; Espallargas, Nuria. (2011) Effect of suspension characteristics on microstructure of suspension plasma sprayed SiC submicron coatings. DVS – German Welding Society, ASM International International Thermal Spray Conference 2011 , Hamburg 2011-09-27 - 2011-09-29
Vitenskapelig foredrag

Bjørnsdotter, Marte; Holme, Caroline; Johnsen, Roy; Nisancioglu, Kemal. (2011) A simple approach for measuring slow rates of hydrogen entrainment and diffusion in metals. The Electrochemical Society 220th ECS Meeting , Boston 2011-10-09 - 2011-10-14
Vitenskapelig foredrag

Bjørnsdotter, Marte; Johnsen, Roy; Nisancioglu, Kemal. (2011) A simple method for measuring hydrogen entrainment and diffusion in stainless steel. European Federation of Corrosion Eurocorr (The European Corrosion Congress) 2011 , Stockholm 2011-09-04 - 2011-09-08
Vitenskapelig foredrag

Bjørnsdotter, Marte; Holme, Caroline; Johnsen, Roy; Nisancioglu, Kemal. (2011) A simple electrochemical engineering approach for measuring very slow rates of hydrogen entrainment and diffusion in metals. The european federation of chemical engineering 9th ESEE (European Symposium on Electrochemical Engineering) 2011 , Chania, Kreta 2011-06-19 - 2011-06-23
Vitenskapelig foredrag

Johnsen, Roy. (2011) Replacement of "Hard Chrome" with HVOF on piston rods for offshore hydraulic sylinders. Svetskommissionen Nordic Conference on Thermal Spraying , Trollhättan 2011-04-13 - 2011-04-14
Vitenskapelig foredrag

Johnsen, Roy; Nyhus, B.; Kongsten, O.E.. (2011) Susceptibility of hydrogen induced stress cracking of duplex stainless steel at elevated temperature. NACE Corrosion 2011 , Houston 2011-03-13 - 2011-03-17
Vitenskapelig foredrag

Johnsen, Roy; Espallargas, Nuria; von der Ohe, Christian B.. (2011) The effect of cyclic and static tensile stresses on the tribocorrosion behavior of austenitic and duplex stainless steels in marine environment. NACE Corrosion 2011 , Houston 2011-03-13 - 2011-03-17
Poster

Asgari, Masoud; Barnoush, Afrooz; Johnsen, Roy; Hoel, Rune. (2011) Effect of In-situ Hydrogen Charging on the Pulsed Plasma Nitriding Layer in Stainless steel. Engineering Conferences International (ECI 2011) Nanomechanical Testing in Materials Research and Development , Lanzarote, Canary Islands 2011-10-09 - 2011-10-14

2010

Vitenskapelig foredrag

Johnsen, Roy; Nisancioglu, Kemal. (2010) INFLUENCE OF TEMPERATURE AND HYDROSTATIC PRESSURE ON HYDROGEN DIFFUSIVITY AND PERMEABILITY IN 13%Cr SUPER MARTENSITIC STAINLESS STEEL UNDER CATHODIC PROTECTION. NACE NACE Corrosion 2010 , San Antonio, Texas 2010-03-13 - 2010-03-17
Populærvitenskapelig foredrag

Johnsen, Roy. (2010) Thirty Years Experience with the use of stainless steels on the Norwegian Continental Shelf. Swerea/KIMAB 21st Seminar on Stainless Steel May 19th 2010 , Stockholm 2010-05-19 - 2010-05-19
Populærvitenskapelig foredrag

Johnsen, Roy. (2010) Corrosion related problems on the Norwegian Continental Shelf - Topside and subsea. Petronas, Pertrad and Intsok Workshop on Corrosion Management , Kuala Lumpur 2010-01-26 - 2010-01-27
Vitenskapelig foredrag

Skjellerudsveen, Magnus; Akselsen, Odd Magne; Olden, Vigdis; Johnsen, Roy. (2010) Effect of microstructure and temperature on hydrogen diffusion and trapping in X70 pipeline steel and its weldments. Dechema EuroCorr 2010 , Moskva 2010-09-13 - 2010-09-17
Vitenskapelig foredrag

Smirnova, Anna; Johnsen, Roy; Nisancioglu, Kemal. (2010) Effect of tensile stress on hydrogen permeation in 13% Cr super martensitic stainless steel. Dechema EuroCorr 2010 , Moskva 2010-09-13 - 2010-09-17
Populærvitenskapelig foredrag

Johnsen, Roy. (2010) Kan termisk sprøyting erstatte ”forkromming” på komponenter offshore?. Korrosjonsteknisk Forening, Bergen / Overflateteknikk Overflate 2010 , Bergen 2010-11-10 - 2010-11-11
Populærvitenskapelig foredrag

Johnsen, Roy. (2010) Improved corrosion protection of topside structures by thermal spraying. Petronas, Pertrad and Intsok Workshop on Corrosion Management , Kuala Lumpur 2010-01-26 - 2010-01-27

2009

Vitenskapelig foredrag

Bjørgum, Astrid Jørgine; Knudsen, Ole Øystein; Johnsen, Roy. (2009) Zinc rich primers - Effect of zinc loading. European Ferderation of Corrosion EUROCORR 2009 , Nice 2009-09-07 - 2009-09-10
Vitenskapelig foredrag

Smirnova, Anna; Johnsen, Roy; Nisancioglu, Kemal. (2009) The influence of calcareous deposit on hydrogen uptake in 13% Cr super martensittic stainles steel under cathodic protection. European Federation of Corrosion EUROCORR 2009 , Nice 2009-09-07 - 2009-09-10
Vitenskapelig foredrag

Johnsen, Roy; Stangeland, Helga Wiig. (2009) Cathodic Protection in Cold Seawater - current density requirements. NACE International Corrosion 2009 , Atlanta, Georgia 2009-03-22 - 2009-03-26
Vitenskapelig foredrag

von der Ohe, Christian B.; Johnsen, Roy; Espallargas, Nuria. (2009) Premature failure of riser tensioner piston rods exposed to offshore splash zone operation – status and review of critical multi-degradation factors. NACE International Corrosion 2009 , Atlanta 2009-03-22 - 2009-03-26
Vitenskapelig foredrag

Rommetveit, Tarjei; Johnsen, Roy; Johansen, Tonni Franke; Baltzersen, Øystein. (2009) High resolution ultrasound thickness measurements through polyester coating and real-time process control. NACE International Corrosion 2009 , Atlanta 2009-03-22 - 2009-03-26
Vitenskapelig foredrag

Johnsen, Roy; Vingsand, Håvard. (2009) Corrosion properties of UNS S32750, UNS N06022 and UNS N10276 in seawater. NACE International Corrosion 2009 , Atlanta 2009-03-22 - 2009-03-26
Vitenskapelig foredrag

Johnsen, Roy. (2009) Hydraulic piston rods for hash environment - Can 25% Cr super duplex stainless steel be the preffered material?. ATI Wah Chang Corrosion Solution 2009 7th International Conference , Park City - Utah 2009-09-20 - 2010-09-24
Vitenskapelig foredrag

Espallargas, Nuria; Johnsen, Roy; von der Ohe, Christian B.. (2009) Tribocorrosion properties of super duplex stainless steel in 3.4% NaCl and H2SO4 0.5M solution. European Federation of Corrosion EUROCORR 2009 , Nice 2009-09-07 - 2009-09-10
Vitenskapelig foredrag

Smirnova, Anna; Johnsen, Roy; Nisancioglu, Kemal. (2009) Influence of calcareous deposits on hydrogen uptake in 13% Cr super martensitic stainless steel under cathodic protection. EuroCorr2009 2009-09-06 - 2009-09-10
Vitenskapelig foredrag

Johnsen, Roy; Nyhus, Bård; Kongstein, Ole Edvard. (2009) Effect of temperature on Hydrogen Induced Stress Cracking (HISC) of UNS S32750 under cathodic protection in seawater. European Federation of Corrosion EUROCORR 2009 , NICE 2009-09-07 - 2009-09-10
Vitenskapelig foredrag

Axelsen, Sten Bjarne; Johnsen, Roy; Knudsen, Ole Øystein. (2009) Protective Coatings Offshore: Introducing a risk based maintenance management system. NACE International Corrosion 2009 , Atlanta 2009-03-22 - 2009-03-26
Poster

Smirnova, Anna; Johnsen, Roy. (2009) New equipment for studying hydrogen diffusion in metals under varying temperature, stress/strain and hydrostatic pressure. EuroCorr2009 2009-09-06 - 2009-09-10

2008

Vitenskapelig foredrag

Johnsen, Roy. (2008) HISC testing of stainless components in seawater under cathodic protection. National Physical laboratory FESI-NPL Workshop "How best to qualify a material for resistance to hydrogen assisted cracking? , Teddington 2008-02-12 - 2008-02-12
Vitenskapelig foredrag

Rommetveit, Tarjei; Johnsen, Roy; Baltzersen, Øystein. (2008) Using ultrasound measurements for real-time process control of pipelines and process equipment subjected to corrosion and/or erosion. NACE International Corrosion 2008 , New Orleans 2008-03-16 - 2008-03-20
Vitenskapelig foredrag

Okstad, Trine; Rannestad, Øyvind; Johnsen, Roy; Nisancioglu, Kemal. (2008) Significance of hydrogen evolution in cathodic protection of steel in seawater. Izmir University XI. International Corrosion Symposium (KORSEM08) , Izmir 2008-10-22 - 2008-10-25
Vitenskapelig foredrag

Johnsen, Roy. (2008) Hydrogensprøhet for materialer i sjøvann - hva vet vi?. Norsk Forening for Vedlikehold Oppshore Prosessanlegg og Rørledninger , Bergen 2008-10-21 - 2008-10-22
Vitenskapelig foredrag

Olden, Vigdis; Thaulow, Christian; Johnsen, Roy. (2008) FE modeling of hydrogen induced stress cracking in 25% Cr duplex stainless steel. 2008 International Hydrogen Conference , Jackson Lake Lodge, Grand Teton National Park, Wyoming 2008-09-07 - 2008-09-10
Vitenskapelig foredrag

Johnsen, Roy; Nyhus, Bård; Wästberg, Stig. (2008) HISC testing of stainless steels under cathodic protection in seawater. Aurocorr 2008 , Edinburgh 2008-09-07 - 2008-09-11
Vitenskapelig foredrag

Olden, Vigdis; Thaulow, Christian; Johnsen, Roy; Østby, Erling; Berstad, Torodd; Nyhus, Bård. (2008) Influence of hydrogen from CP on the fracture susceptibility of 25% Cr duplex stainless steel - FE modeling of constant load testing using hydrogen influenced cohesive zone elements. ISOPE 2008 , Vancouver 2008-07-06 - 2008-07-11
Vitenskapelig foredrag

Johnsen, Roy; Vingsand, Håvard. (2008) Comparion of corrosion properties of UNS S32750, UNS N06022 and UNS N10276 in seawater. Eurocorr 2008 , Edinburgh 2008-09-07 - 2008-09-11
Vitenskapelig foredrag

Espallargas, Nuria; Johnsen, Roy; Lunde, Lars; Berget, Jon. (2008) Coatings for use in Telescopic Joint used in Workover riser systems. Eurocorr 2008 , Edinburgh 2008-09-07 - 2008-09-11
Vitenskapelig foredrag

Axelsen, Sten Bjarne; Røsseland, T.; Johnsen, Roy; Knudsen, Ole Øystein. (2008) Topcoat flaking - A mechanism study. NACE Corrosion 2008 , New Orleans 2008-03-16 - 2008-03-20

2007

Vitenskapelig foredrag

Johnsen, Roy. (2007) Cathodic protection in natural seawater - current practice and effect on probability of hydrogen induced stress cracking. European Federation of Corrosion Event No. 289 Konferanse , Freiburg im Breisgau 2007-09-09 - 2007-09-13
Vitenskapelig foredrag

Johnsen, Roy; Lauvstad, Gro Ø.; Asbjørnsen, Ingvild; Bjurstrøm, Martin; Hjort, Carl Gustav. (2007) The resistance towards hydrogen induced stress cracking (HISC) of hot isostatically pressed (HIP) duplex stainless steels under cathodic protection. European Federation of Corrosion Event No. 289 Eurocorr 2007 , Freiburg im Breisgau 2007-09-09 - 2009-09-13
Vitenskapelig foredrag

Johnsen, Roy; Bjørgum, Astrid Jørgine; Knudsen, Ole Øystein; Kvernbråten, Ann-Karin. (2007) Bare steel maintenance offshore - effect of different mechanical pre-treatment methods. European Federation of Corrosion Event No. 289 Eurocorr 2007 , Freiburg im Breisgau 2007-09-09 - 2007-09-13
Vitenskapelig foredrag

Smirnova, Anna; Johnsen, Roy. (2007) Hydrogen Permeation in Super Martensitic and Duplex Stainless Steels under Cathodic Charging and Exposed to Artificial Seawater and 3.5% NaCl Solution. EuroCorr 2007 , Freiburg 2007-09-09 - 2007-09-13
Vitenskapelig foredrag

Johnsen, Roy; Okstad, Trine; Nicansioglu, Kemal; Rannestad, Øyvind. (2007) Significance of hydrogen evolution during cathodic protection. NACE International NACE Corrosion 2007 , Nashville, TN 2007-03-11 - 2007-03-15
Vitenskapelig foredrag

Johnsen, Roy; Baltzersen, Øystein; Waag, Tor Inge; Ahlén, Carl Henrik; Tveit, Edd. (2007) Wall thickness monitoring of new and existing subsea pipelines using ultrasound. NACE International NACE Corrosion 2007 , Nashville, TX 2007-03-11 - 2007-03-15
Vitenskapelig foredrag

Lauvstad, Gro Ø.; Johnsen, Roy; Nyhus, Bård. (2007) Improved resistance towards hydrogen induced stress cracking (HISC) of hot isostatically pressed (HIP) duplex stainless steels under cathodic protection. NACE International NACE Corrosion 2007 , Nashville, TN 2007-03-11 - 2007-03-15
Vitenskapelig foredrag

Johnsen, Roy; Nyhus, Bård; Wästberg, Stig; Lauvstad, Gro Ø.. (2007) New improved method for HISC testing of stainless steels under cathodic protection. NACE International NACE Corrosion 2007 , Nashville, TN 2007-03-11 - 2007-03-15
Vitenskapelig foredrag

Johnsen, Roy; Berget, John; Nilsen, Tonelill. (2007) Influence of porosity on corrosion properties of thermally sprayed coatings. NACE International NACE Corrosion 2007 , Nashville, TN 2007-03-11 - 2007-03-15
Vitenskapelig foredrag

Bjørgum, Astrid Jørgine; Johnsen, Roy; Knudsen, Ole Øystein; Kvernbråten, Ann-Karin. (2007) Repair coating systems for bare steel: Effect of pre-treatment and conditions during application and curing. NACE International NACE Corrosion 2007 , Nashville, TN 2007-03-11 - 2007-03-15
Vitenskapelig foredrag

Knudsen, Ole Øystein; Johnsen, Roy; Bjørgum, Astrid Jørgine; Polanco-Loria, Mario A.; Øyen, Anne. (2007) Internal stress and mechanical properties of pant films. NACE International NACE Corrosion 2007 , Nashville, TN 2007-03-11 - 2007-03-15
Vitenskapelig foredrag

Lauvstad, Gro Ø.; Johnsen, Roy; Borch, Øyvind; Da Silva, Erik Falck; Walmsley, John C. (2007) Breakdown in passivity of austenitic stainless steels in Cl- and H2S - modeling and characterization of the pit initiation process. NACE International NACE Corrosion 2007 , Nashville, TN 2007-03-11 - 2007-03-15
Vitenskapelig foredrag

Baltzersen, Øystein; Waag, Tor Inge; Johnsen, Roy; Ahlén, Carl Henrik; Tveit, Edd. (2007) Wall Thickness Monitoring of new and existing subsea pipelines using ultrasound. NACE NACE Corrosion 2007-01-01 - 2007-02-01

2006

Vitenskapelig foredrag

Johnsen, Roy; Nilsen, Anders Calder. (2006) Cathodic Protection of FPSO's - Current density requirements at potentials more negative than -1000 mV Ag/AgCl. Intenational Association of Corrosion Engineers NACE CORROSION 2006 , San Diego 2006-03-12 - 2006-03-16
Vitenskapelig foredrag

Johnsen, Roy; Berget, John; Rogne, Trond. (2006) Improved Corrosion Resistance of HVOF sprayed ceramic-metallic coatings. International Association of Corrosion Engineers NACE CORROSION2006 , San Diego 2006-03-12 - 2006-03-16
Vitenskapelig foredrag

Johnsen, Roy. (2006) Korrosjonstekniske utfordringer i oljeindustrien. Norsk Forening for Vedlikerhold Årsmøte i Norsk Forening for Vedlikehold , Molde 2006-05-10 - 2006-05-11
Vitenskapelig foredrag

Johnsen, Roy; Mikkelsen, Andre; Wästberg, Stig; Nyhus, Bård; Rogne, Trond. (2006) Influence of ambient pressure on Hydrogen Induced Stress Cracking (HISC) of Duplex Stainless Steels under Cathodic Protection. International Association of Corrosion Engineers NACE CORROSION 2006 , San Diego 2006-03-12 - 2006-03-16
Vitenskapelig foredrag

Johnsen, Roy; Knudsen, Ole Øystein; Bjørgum, Astrid Jørgine; Frydenberg, Tone. (2006) Development of internal stress in organic coatings during curing and exposure. Intarnational Accosiation of Corrosion Engineers NACE CORROSION2006 , San Diego 2006-03-12 - 2006-03-16
Populærvitenskapelig foredrag

Johnsen, Roy. (2006) Belegg for hydrauliske sylindere i marint miljø - Erfaringer og fremtidig behov. Norges Forskningsråd og Sveiseteknisk Forening Materialdagen , Stavanger 2006-10-25 - 2006-10-25
Populærvitenskapelig foredrag

Johnsen, Roy. (2006) Hva er korrosjon?. Tekniske Foreningers Servicekontor Strategisk Inspeksjonsstyring , Stavanger 2006-04-25 - 2006-04-26

2005

Vitenskapelig foredrag

Johnsen, Roy. (2005) Hydrogen Induced Stress Cracking of Stainless Steels. European Federation of Corrosion (EFC) EUROCORR'2005 , Lisboa 2005-09-05 - 2005-09-08
Vitenskapelig foredrag

Johnsen, Roy. (2005) HISC - Problemstillinger og utfordringer. Stålmat / Norsk Sveiseteknisk Forening Materialdagen 2005 , Stavanger 2005-10-26 - 2005-10-26
Vitenskapelig foredrag

Johnsen, Roy. (2005) A New Multichannel Ultrasonic System for Subsea Corrosion amd Erosion Monitoring. NACE International CORROSION'2005 , Houston TX 2005-04-03 - 2005-04-07

2004

Vitenskapelig foredrag

Johnsen, Roy. (2004) Experience with the use of Copper Alloys in seawater systems in the Norwegian Sector of the North Sea. European Federation of Corrosion Eurocorr 2004 , NICE 2004-09-12 - 2004-09-16
Populærvitenskapelig foredrag

Johnsen, Roy. (2004) Robuste beleggsystem for offshore konstruksjoner. Norsk Korrosjonsteknisk Forening - Avd. Stavanger Bransjeseminar Materialer og Belegg , Stavanger 2004-05-25 - 2004-05-26
Populærvitenskapelig foredrag

Johnsen, Roy. (2004) Malingsvedlikehold - Verktøy for planlegging og utførelse. Teknologisk Institutt Overflatedagene 2004 , Oslo 2004-11-08 - 2004-11-10
Populærvitenskapelig foredrag

Johnsen, Roy. (2004) Korrosjonsproblem i offshore industrien - Hva har vi lært?. Stålmat (NFR) Materialdagen 2004 , Stavanger 2004-10-27 - 2004-10-27

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