The mechanism of hydrogen embrittlement: The stress interaction between a crack, a hydrogen cluster, and moving dislocations

A. T. Yokobori

    Research output: Contribution to journalArticlepeer-review

    13 Citations (Scopus)

    Abstract

    Mechanisms of dissolvent anodic chemical reaction and hydrogen embrittlement have been proposed as stress corrosion cracking (SCC) mechanisms. The former is feasible for the case of plastic deformation dominant metals (low-yield stress), and the latter is for high-strength metals such as high-strength steels. However, in spite of low-yield stress, a discontinuous cleavage-like fracture is sometimes observed during SCC for ductile fee alloys, which concerns the interaction between dislocations and the hydrogen cluster. The problem of when these mechanisms will be dominant remains. In this paper, the stress corrosion cracking model on the basis of hydrogen diffusion and concentration toward the elastic-plastic stress field around a crack and the interaction of dislocations and hydrogen around a crack tip are proposed to clarify the mechanism of stress corrosion cracking for ductile and brittle materials. We conducted numerical analyses using these proposed models.

    Original languageEnglish
    Pages (from-to)121-131
    Number of pages11
    JournalInternational Journal of Fracture
    Volume128
    Issue number1
    DOIs
    Publication statusPublished - 2004 Jul 1

    Keywords

    • Cleavage fracture
    • Dislocation motion
    • HE parameter
    • Hydrogen diffusion
    • Hydrogen embrittlement
    • Stress corrosion cracking

    ASJC Scopus subject areas

    • Computational Mechanics
    • Modelling and Simulation
    • Mechanics of Materials

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