PSI - Issue 42

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 42 (2022) 935–942

© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 23 European Conference on Fracture – ECF23 Abstract The use of hydrogen as an energy carrier plays a key role in the transition from fossil fuel to renewable energy. Norway may contribute to this shift by applying its vast natural gas subsea pipeline network for large-scale transport of hydrogen gas to the European countries. However, safe operating limits and countermeasures for hydrogen embrittlement need to be established to safely enable the transport. The knowledge basis for safe operation limits is being built upon a research project funded by the Research Council of Norway and an international industry consortium. This paper presents the results of an initial materials screening program involving examination of three vintage pipelines and one new pipeline. Results of microstructural characterization, slow strain rate tensile testing in air and in situ hydrogen charging conditions performed on the base metal are presented and discussed. The hydrogen embrittlement susceptibility of each material taken from three different positions within the pipe is quantified through the Embrittlement Index (EI). The post-mortem analysis of the fracture surfaces morphologies is also carried out to relate the overall degree of hydrogen embrittlement susceptibility to the characteristic metallurgical features of the material. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23 Keywords: Hydrogen Embrittlement; Slow Strain Rate Tensile Testing, Electrochemical Hydrogen Charging 2 an open access article under the CC B 23 European Conference on Fracture - ECF23 Hydrogen Embrittlement Assessment of Pipeline Materials Through Slow Strain Rate Tensile Testing Aleksander Omholt Myhre a* ,Anette Brocks Hagen b , Bård Nyhus b , Vigdis Olden b , Antonio Alvaro a,b , Alexei Vinogradov a a Norwegian University of Science and Technology, Department of Mechanical and Industrial Engineering, Richard Birkelands vei 2B, 7034 Trondheim, Norway b SINTEF Industry, Materials and Nanotechnology, Richard Birkelands vei 3, 7034 Trondheim, Norway e b ård b b io Alva a,b g a

* Corresponding author. E-mail address: aleksander.o.myhre@ntnu.no

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23

2452-3216 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.118