High-pressure torsion of metastable austenitic stainless steel at moderate temperatures

Yoji Mine, Daisuke Haraguchi, Zenji Horita, Kazuki Takashima

    研究成果: Contribution to journalArticle査読

    4 被引用数 (Scopus)

    抄録

    We subjected samples of a 304 metastable austenitic stainless steel to high-pressure torsion (HPT) in the temperature range of 303-573 K, (i.e. at different austenite stabilities), to examine their microstructures and mechanical properties. HPT processing at room temperature led to the formation of a lamellar microstructure with austenitic and martensitic phases, of which sizes were characterised by prior austenite grains, whereas HPT processing at moderate temperatures produced nanostructured austenite grains through mechanical twinning. The nanostructured 304 steel with an average grain size of ∼70 nm exhibited a fine balance between tensile strength (∼1.7 GPa) and reduction of area (∼55%).

    本文言語英語
    ページ(範囲)269-276
    ページ数8
    ジャーナルPhilosophical Magazine Letters
    95
    5
    DOI
    出版ステータス出版済み - 5 4 2015

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics

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