Hydrogen-induced intergranular failure of iron

Shuai Wang, May L. Martin, Petros Sofronis, Somei Ohnuki, Naoyuki Hashimoto, Ian M. Robertson

    研究成果: Contribution to journalArticle査読

    136 被引用数 (Scopus)

    抄録

    The hydrogen embrittlement of a commercial-grade pure iron was examined by using repeated stress-relaxation tests under simultaneous cathodic hydrogen charging. The hydrogen-charged iron, containing an estimated 25.8 appm H, fractured after repeated transients, with a total strain of ∼5%. The fracture mode was intergranular. Thermal activation measurements show a decrease in activation volume and free energy, which is consistent with hydrogen enhancing the dislocation velocity. The microstructure beneath the intergranular facets displays a dislocation cell structure more complex than expected for intergranular fracture and this strain-to-failure. It is proposed that hydrogen accelerates the evolution of the dislocation microstructure through the hydrogen-enhanced plasticity mechanism and this work-hardening of the matrix along with the attendant hydrogen concentration at the grain boundaries are crucial steps in causing the observed hydrogen-induced intergranular failure.

    本文言語英語
    ページ(範囲)275-282
    ページ数8
    ジャーナルActa Materialia
    69
    DOI
    出版ステータス出版済み - 5 2014

    All Science Journal Classification (ASJC) codes

    • 電子材料、光学材料、および磁性材料
    • セラミックおよび複合材料
    • ポリマーおよびプラスチック
    • 金属および合金

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