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Description:

Hydrogen-assisted (HA) fatigue crack growth (FCG) occurs in ferritic steels, wherein H-dislocation interaction plays a vital role. We aim to model the HAFCG mechanism based on the obstruction of dislocations within the crack tip zone. Our modeling framework is as follows: H is condensed into crack tip and trapped by dislocations; these H significantly decrease dislocation mobility; stress relief via crack blunting is suppressed; localized brittle fracture triggers HAFCG. This model was substantiated experimentally in H2 gas at various load frequencies and temperatures. Theoretical formulations were established considering the thermal equilibrium of H-trapping and dislocation breakaway from the H atmosphere.

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Hydrogen embrittlement, Fatigue crack growth, Ferritic steel, Dislocation

Date published: 2025-12-31

Publisher: Informa UK Limited

Journal:

• Science and Technology of Advanced Materials (ISSN: 14686996) vol. 26 issue. 1

Funding:

• JSPS KAKENHI

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1080/14686996.2024.2436345

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Updated at: 2025-01-09 16:31:04 +0900

Published on MDR: 2025-01-20 12:31:02 +0900