PSI - Issue 59

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Procedia Structural Integrity 00 (2024) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Procedia Structural Integrity 00 (2024) 000 – 000

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 59 (2024) 104–111

© 2024 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 DMDP 2023 Organizers © 2024 The Auth ors. 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 DMDP 2023 Organizers Abstract This paper discusses the role of diffusion in the hydrogen transport in pearlitic steel by studying hydrogen-plasticity interactions. To this end, it focuses on the effects of crack-tip residual stresses of compressive nature, generated by fatigue loading, in stress corrosion cracking of pre-cracked samples of high strength pearlitic steel subjected to localized anodic dissolution and hydrogen assisted cracking. In both situations, compressive residual stresses improve the stress corrosion behaviour of the steel by delaying either the near-tip metal dissolution or the crack-tip hydrogen diffusion, thus increasing the fracture load in aggressive media. The Rice's model of residual stress distribution in the close vicinity of a crack tip is used to explain these retardation effects by estimating the stress level and the plastic zone. On the basis of the near-tip yielding (plastic zone) evolution and the size of the hydrogen-assisted micro-damage region, it is seen that hydrogen diffusion predominates over hydrogen transport by dislocations. © 2024 The Auth ors. 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 DMDP 2023 Organizers VII International Conference ―In -service Damage of Materials: Diagnostics and Prediction ‖ (DMDP 2023) Role of diffusion in the hydrogen transport in pearlitic steel: Interactions between crack-tip plasticity and hydrogen. A Tribute to T.S. Eliot’s “ And All is Always Now ” Jesús Toribio * Fracture & Structural Integrity Research Group (FSIRG), University of Salamanca (USAL) E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain Abstract This paper discusses the role of diffusion in the hydrogen transport in pearlitic steel by studying hydrogen-plasticity interactions. To this end, it focuses on the effects of crack-tip residual stresses of compressive nature, generated by fatigue loading, in stress corrosion cracking of pre-cracked samples of high strength pearlitic steel subjected to localized anodic dissolution and hydrogen assisted cracking. In both situations, compressive residual stresses improve the stress corrosion behaviour of the steel by delaying either the near-tip metal dissolution or the crack-tip hydrogen diffusion, thus increasing the fracture load in aggressive media. The Rice's model of residual stress distribution in the close vicinity of a crack tip is used to explain these retardation effects by estimating the stress level and the plastic zone. On the basis of the near-tip yielding (plastic zone) evolution and the size of the hydrogen-assisted micro-damage region, it is seen that hydrogen diffusion predominates over hydrogen transport by dislocations. VII International Conference ―In -service Damage of Materials: Diagnostics and Prediction ‖ (DMDP 2023) Role of diffusion in the hydrogen transport in pearlitic steel: Interactions between crack-tip plasticity and hydrogen. A Tribute to T.S. Eliot’s “ And All is Always Now ” Jesús Toribio * Fracture & Structural Integrity Research Group (FSIRG), University of Salamanca (USAL) E.P.S., Campus Viriato, Avda. Requejo 33, 49022 Zamora, Spain Keywords: pearlitic steel; hydrogen diffusion; hydrogen transport by dislocations; hydrogen-plasticity interactions; hydrogen assisted cracking. Keywords: pearlitic steel; hydrogen diffusion; hydrogen transport by dislocations; hydrogen-plasticity interactions; hydrogen assisted cracking.

* Corresponding author. Tel.: +34-677566723; fax: +34-980545002. E-mail address: toribio@usal.es * Corresponding author. Tel.: +34-677566723; fax: +34-980545002. E-mail address: toribio@usal.es

2452-3216 © 2024 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 DMDP 2023 Organizers 2452-3216 © 2024 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 DMDP 2023 Organizers

2452-3216 © 2024 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 DMDP 2023 Organizers 10.1016/j.prostr.2024.04.016