Hydrogen effects on ultrafine-grained steels processed by high-pressure torsion

Yoji Mine, Zenji Horita

    研究成果: Contribution to journalReview article査読

    15 被引用数 (Scopus)

    抄録

    This article reviews the interactions between hydrogen and lattice defects produced by high-pressure torsion (HPT) process in ferritic iron and austenitic steels, and it shows the direction of development of hydrogen-resistant high-strength steels. In ferritic iron, grain boundaries as well as dislocations participate in hydrogen trapping. For austenitic steels, the contribution of grain boundaries to hydrogen trapping is negligible, while short-circuit diffusion occurs through them. Hydrogen trapping on precipitates caused by annealing after HPT processing depends on the affinity of hydrogen with constituting elements. In metastable austenitic steels, the presence of hydrogen suppresses deformationinduced martensitic transformation through enhanced slip planarity. If hydrogen-containing austenite transforms to martensite, excess hydrogen corresponding to a difference in the solubility between both phases is generated and diffuses out of the martensite, resulting in hydrogen concentration at the interphase. Deformation-induced martensite generated from ultrafine-grained austenite is used to simultaneously enhance strength and ductility without suffering from hydrogen embrittlement.

    本文言語英語
    ページ(範囲)773-785
    ページ数13
    ジャーナルMaterials Transactions
    53
    5
    DOI
    出版ステータス出版済み - 2012

    All Science Journal Classification (ASJC) codes

    • 材料科学(全般)
    • 凝縮系物理学
    • 材料力学
    • 機械工学

    フィンガープリント

    「Hydrogen effects on ultrafine-grained steels processed by high-pressure torsion」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。

    引用スタイル