Reverse Transformation Behavior in Multi-phased Medium Mn martensitic Steel Analyzed by <i>In-situ</i> Neutron Diffraction

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  • Matsuda Kyosuke
    Graduate School of Engineering, Kyushu University
  • Masumura Takuro
    Department of Materials, Kyushu University
  • Tsuchiyama Toshihiro
    Department of Materials, Kyushu University Research Center for Steel, Kyushu University
  • Onuki Yusuke
    Department of Advanced Machinary Engineering, School of Engineering, Tokyo Denki University
  • Takanashi Misa
    Research Center for Steel, Kyushu University High Toughness Steel Research Laboratory, Steel Research Laboratories, Nippon Steel Corporation
  • Maeda Takuya
    Research Center for Steel, Kyushu University High Toughness Steel Research Laboratory, Steel Research Laboratories, Nippon Steel Corporation
  • Kawamoto Yuzo
    High Toughness Steel Research Laboratory, Steel Research Laboratories, Nippon Steel Corporation
  • Shirahata Hiroyuki
    High Toughness Steel Research Laboratory, Steel Research Laboratories, Nippon Steel Corporation
  • Uemori Ryuji
    Research Center for Steel, Kyushu University

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Other Title
  • その場中性子回折による複相マルテンサイト組織を有する中Mn鋼の逆変態挙動の解析
  • ソノ バ チュウセイシ カイセツ ニ ヨル フクソウ マルテンサイト ソシキ オ ユウスル チュウ Mnコウ ノ ギャクヘンタイ キョドウ ノ カイセキ

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Abstract

<p>The reverse transformation behavior during heating in Fe-10%Mn-0.1%C (mass%) martensitic alloy consisting of α’-martensite, ε-martensite and retained austenite was investigated using the in-situ neutron diffraction. When the temperature was elevated with a heating rate of 10 K/s, the ε→γ reverse transformation occurred first at the temperature range of 535–712 K, where Fe and Mn hardly diffused. In the temperature range where the ε→γ reverse transformation occurred, the full width at half maximum of the 200γ peak increased, indicating that the austenite reversed from ε-martensite contains high-density dislocations. In addition, the transformation temperature hardly depends on the heating rate and the crystal orientation of the reversed austenite was identical to that of the prior austenite (austenite memory), which suggests that the ε→γ reverse transformation would proceed through the displacive mechanism. After completion of the ε→γ transformation, the α’→γ reverse transformation occurred at the temperature range of 842–950 K. When the heating rate is low (<10 K/s), the reverse transformation start temperature significantly depends on the heating rate. It could be because the diffusional reverse transformation accompanying the repartitioning of Mn occurs. On the other hand, a higher heating rate (≥10 K/s) resulted in the disappearance of the heating rate dependence. This was probably due to the change in the transformation mechanism to the massive-type transformation, which is diffusional transformation without repartitioning of Mn.</p>

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 110 (2), 83-88, 2024-02-01

    The Iron and Steel Institute of Japan

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