Quantitative Analysis of Hardening due to Carbon in Solid Solution in Martensitic Steels

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  • Uranaka Shohei
    Graduate School of Engineering, Kyushu University
  • Hirashima Issei
    Graduate School of Engineering, Kyushu University
  • Maeda Takuya
    Research Center for Steel, Kyushu University Plate, Shape, Pipe & Tube Research Laboratory, Steel Research Laboratories, Nippon Steel Corporation
  • Masumura Takuro
    Department of Materials, Kyushu University
  • Tsuchiyama Toshihiro
    Research Center for Steel, Kyushu University Department of Materials, Kyushu University
  • Kawamoto Yuzo
    Plate, Shape, Pipe & Tube Research Laboratory, Steel Research Laboratories, Nippon Steel Corporation
  • Shirahata Hiroyuki
    Plate, Shape, Pipe & Tube Research Laboratory, Steel Research Laboratories, Nippon Steel Corporation
  • Uemori Ryuji
    Research Center for Steel, Kyushu University

Bibliographic Information

Other Title
  • マルテンサイト鋼における炭素による固溶硬化の定量解析
  • マルテンサイトコウ ニ オケル タンソ ニ ヨル コヨウ コウカ ノ テイリョウ カイセキ

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Description

<p>The relationship between hardness and solute carbon concentration estimated via electrical resistivity measurement was investigated in as-quenched and tempered martensitic steels containing carbon of 0.3-0.6 mass%. As a result of corelating the amount of hardening due to carbon in solid solution with the solute carbon concentration, by the calculation to subtract precipitation strengthening, grain refinement strengthening, dislocation strengthening, and softening due to retained austenite from the total strengthening, we derived an equation of solid solution strengthening, where the hardening increases proportionally to the 1 / 2 or 2 / 3 power of the solute carbon concentration. It was confirmed that the effects of the factors other than solid solution strengthening due to carbon on hardness are relatively small in tempered specimens when the tempering temperature is less than 673 K; therefore, the change in hardness in tempered martensitic steels can be mostly explained by solute carbon concentration regardless of carbon content.</p>

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 109 (7), 649-660, 2023-07-01

    The Iron and Steel Institute of Japan

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