4.4 Article

Function of hydrogen in embrittlement of high-strength steels

Journal

ISIJ INTERNATIONAL
Volume 41, Issue 6, Pages 590-598

Publisher

IRON STEEL INST JAPAN KEIDANREN KAIKAN
DOI: 10.2355/isijinternational.41.590

Keywords

hydrogen embrittlement; fracture; lattice defect; fractography; thermal desorption analysis; high-strength steel

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Various models so far proposed for the mechanism of hydrogen embrittlement (HE) of steels are critically reviewed with respect to the manifestation of hydrogen in the fracture process. Recent studies that elucidate the hydrogen states and their relevance to HE are discussed. Particular attention is paid to the role of deformation-induced defects that interact with hydrogen. A model is proposed in which increased vacancy density and agglomeration lead to the promotion of failure. The model ascribes HE to the context of ductile fracture in which vacancies play the primary role.

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