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

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

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    20 Citations (Scopus)

    Abstract

    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.

    Original languageEnglish
    Pages (from-to)25-31
    Number of pages7
    JournalTetsu-To-Hagane/Journal of the Iron and Steel Institute of Japan
    Volume98
    Issue number1
    DOIs
    Publication statusPublished - 2012

    All Science Journal Classification (ASJC) codes

    • Condensed Matter Physics
    • Physical and Theoretical Chemistry
    • Metals and Alloys
    • Materials Chemistry

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