Advances in Physical Metallurgy and Processing of Steels. Function of Hydrogen in Embrittlement of High-strength Steels.

TLDR

Hydrogen embrittlement mechanisms in steels are reviewed, emphasizing recent findings on hydrogen states and the role of deformation‑induced defects. The study proposes a model in which increased vacancy density and agglomeration promote failure. The model attributes hydrogen embrittlement to ductile fracture driven by vacancies.

Abstract

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.