Effect of Alloying Elements on Grain Boundary Segregation of Boron and Carbon in α-Iron

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  • Tokunaga Tatsuya
    Department of Materials Science and Engineering, Faculty of Engineering, Kyushu Institute of Technology
  • Motomura Yuta
    Graduate Student, Kyushu Institute of Technology, now TOCALO Co., Ltd.
  • Era Hidenori
    Department of Materials Science and Engineering, Faculty of Engineering, Kyushu Institute of Technology
  • Tsuchiyama Toshihiro
    Department of Materials Science and Engineering, Graduate School of Engineering, Kyushu University
  • Shobu Kazuhisa
    Research Institute of Computational Thermodynamics, Inc.
  • Hasebe Mitsuhiro
    Department of Materials Science and Engineering, Faculty of Engineering, Kyushu Institute of Technology Research Institute of Computational Thermodynamics, Inc.
  • Ohtani Hiroshi
    Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, now Toyota Physical and Chemical Research Institute

Bibliographic Information

Other Title
  • α鉄におけるホウ素，炭素の粒界偏析に及ぼす合金元素の影響
  • aテツ ニ オケル ホウソ,タンソ ノ リュウカイヘンセキ ニ オヨボス ゴウキン ゲンソ ノ エイキョウ

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Abstract

<p>To clarify the effect of alloying elements (M) on the grain boundary segregation behavior of boron (B) and carbon (C) in α-iron, the grain boundary segregation of B, C and alloying elements was evaluated thermodynamically for the Fe–B–1.0 at.%M and the Fe–C–1.0 at.%M ternary systems (M: Al, Ti, V, Cr, Mn, Nb, Mo) using the parallel tangent law proposed by Hillert. In this calculation, the Gibbs energies of the liquid phase in the Fe–B–M and Fe–C–M ternary systems were applied to those of the grain boundaries. According to the calculated results, in the Fe–B–M ternary systems, co-segregation of Ti, V, Mn or Nb with B was predicted, while no co-segregation behavior was confirmed in the case of Al, Cr or Mo addition; in the Fe–C–M ternary systems, co-segregation of Ti, V, Nb or Mo with C was predicted, while no co-segregation behavior was confirmed in the case of Al, Cr or Mn addition. These co-segregation tendencies correspond well with the formation tendencies of metal borides or metal carbides. Although the present calculated results were based on the assumption that substitutional elements can diffuse sufficiently in addition to interstitial elements B and C, we proposed an equation for the parallel tangent law under paraequilibrium condition in which no partitioning of substitutional elements occurs.</p>

Journal

  • Tetsu-to-Hagane

    Tetsu-to-Hagane 109 (3), 158-166, 2023

    The Iron and Steel Institute of Japan

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