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 hydrog
en 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 d
uctile fracture in which vacancies play the primary role.