Effect of Cu addition on phase transformation and microstructure in 9 mass% Cr martensitic steels

Yuichi Futamura, Toshihiro Tsuchiyama, Setsuo Takaki

    研究成果: ジャーナルへの寄稿学術誌査読

    5 被引用数 (Scopus)

    抄録

    Effect of Cu addition on microstructure was investigated in Fe-Cr-Cu martensitic alloys by means of optical and transmission electron microscopy, and X-ray diffractometry. Lath-martensitic single structure can be obtained in 9 mass%-Cu steels water-quenched from the solution treatment temperature of 1273 K. The morphology of martensite-laths is independent of Cu content in the steels with 4 mass% Cu or less. Dislocation density in martensitic structure, however, is enhanced with increasing Cu content. On the solution treatment, Cu atoms markedly segregate at austenite grain boundary, and the Cu content increases to about 50 at% (53 mass%) in the case of 9 mass%Cr-4 mass%Cu steel. This results in the retardation of grain growth of austenite at the solution treatment temperature probably due to the grain boundary dragging effect by Cu atoms and/or the decrease in grain boundary energy. The austenite grain refining by Cu addition also causes the refining of substructure within prior austenite grains; martensite-block and -packet structure.

    本文言語英語
    ページ(範囲)697-702
    ページ数6
    ジャーナルTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
    85
    9
    DOI
    出版ステータス出版済み - 1999

    !!!All Science Journal Classification (ASJC) codes

    • 凝縮系物理学
    • 物理化学および理論化学
    • 金属および合金
    • 材料化学

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