Effect of Solution Nitriding on Microstructure and Hardness in 12%Cr Martensitic Stainless Steels

Huynh Kinh Luan Ngo, Koichi Nakashima, Toshihiro Tsuchiyama, Setsuo Takaki

    研究成果: ジャーナルへの寄稿学術誌査読

    17 被引用数 (Scopus)

    抄録

    Synopsis : Solution nitriding was applied to conventional 12%Cr stainless steels such as JIS SUS410L, SUS410, SUS420J1 and SUS420J2, and then the microstructure and hardness were examined for the as-quenched specimens as well as tempered ones. Nitrogen concentration was increased to around 0. 28 mass% under the solution nitriding condition of 1473K-0. 1MPa N2 in all of the 12%Cr steels regardless of the carbon content. Solid solution strengthening by nitrogen was relatively small compared with that by carbon in as-quenched martensite. However, solutionnitrided steels exhibited a remarkably large secondary hardening during tempering, which hardly appears in conventional martensitic stainless steels without nitrogen. TEM observation and X-ray analysis for extracted residue indicated that the secondary hardening by nitrogen was caused by precipitation of fine CrN nitride.

    本文言語英語
    ページ(範囲)25-31
    ページ数7
    ジャーナルTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
    98
    1
    DOI
    出版ステータス出版済み - 2012

    !!!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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