The characteristics of hydrogen diffusion and concentration around a crack tip concerned with hydrogen embrittlement

A. Toshimitsu Yokobori, Yasrou Chinda, Takenao Nemoto, Koji Satoh, Tetsuya Yamada

    研究成果: Article査読

    94 被引用数 (Scopus)

    抄録

    Previously, we proposed a physical model for hydrogen diffusion and accumulation around the crack tip and performed accurate numerical analysis which takes account of the effects of both hydrogen diffusion and accumulation due to the stress gradient. Based on this analysis, the characteristics of hydrogen accumulation around the crack tip were clarified. Since the characteristics of stress corrosion cracking and corrosion fatigue are dominated by chemical anodic reaction, hydrogen embrittlement and dislocation mechanism, to perform the analysis on the competitive phenomenon by these mechanism and to relate the sensitivity of hydrogen embrittlement to the characteristics of corrosion fatigue, it is necessary to construct a exact physical law on the characteristics of hydrogen diffusion and concentration and to formulate the characteristics as a simple function such as diffusion constant, D, yield stress σys, and stress intensity factor, K. The effect of stress field such as plane strain and plane stress on the hydrogen embrittlement is necessary to be clarified as the effect of specimen thickness on the hydrogen embrittlement. In this paper, based on this view point, the effect of D, σfys, and K on hydrogen embrittlement were investigated and formulated. A quantitative parameter which characterize hydrogen embrittlement was proposed for both cases of plane strain and plane stress conditions as the effect of specimen thickness on the hydrogen embrittlement.

    本文言語English
    ページ(範囲)407-424
    ページ数18
    ジャーナルCorrosion Science
    44
    3
    DOI
    出版ステータスPublished - 2002 3

    ASJC Scopus subject areas

    • 化学 (全般)
    • 化学工学(全般)
    • 材料科学(全般)

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