PSI - Issue 42

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

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Procedia Structural Integrity 42 (2022) 1428–1435

© 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 In order to evaluate the hydrogen-defect interactions, an internal friction study is performed on hydrogen-charged cold rolled ultra low carbon steel. For this purpose, the steel is subjected to various thermo-mechanical treatments and information on the hydrogen dislocation interactions are obtained via thorough analysis of the so-called hydrogen cold work peak obtained by internal friction. Using existing theoretical models, the peak could be decomposed into two contributions from hydrogen segregation at screw and non-screw dislocations. © 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/) 1. Introduction Understanding the interactions of hydrogen (H) with microstructural defects is of major importance for the mitigation of H embrittlement (HE). Several current models describing the HE mechanism identify H-dislocation interactions as the detrimental ones. However, the type of dislocation most involved in the HE mechanism is often not specified, despite DFT calculations indicating a strong difference between the H-binding to edge vs screw or mixed dislocations (Itakura et al. (2013), Lu et al. (2018), Ramasubramaniam et al. (2009), Taketomi et al. (2008)) Recently, interest has also been raised towards the action of vacancies and their interactions with H. Moreover, other interstitials present in steel, such as carbon (C), are known to interact with these defects as well. Consequently, the C distribution might strongly influence the H-defect interactions. Peer-review under responsibility of 23 European Conference on Fracture - ECF23 23 European Conference on Fracture - ECF23 The interaction of hydrogen with microstructural defects studied by internal friction Liese Vandewalle a , Milan J. Konstantinovi ć b , Kim Verbeken a *, Tom Depover a * a Ghent University; Department of Materials, Textiles and Chemical Engineering; Sustainable Materials Science, Tech Lane Ghent Science Park 46, B-9052 Ghent, Belgium b Belgian Nuclear Research Centre (SCK-CEN), Boeretang 200, B-2400 Mol, Belgium a e Peer-review under responsibility of 23 European Conference on Fracture - ECF23 Keywords: Hydrogen-defect interactions; Internal friction; Carbon-vacancies; Dislocations

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.2022.12.182