Numerical Analysis of Redistribution of Chromium and Carbon during Solidification of Primary Austenite in Fe-Cr-C Alloy

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  • Ono Yukinori
    Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University
  • Takechi Tsutomu
    Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University
  • Ogi Keisaku
    Department of Materials Science and Engineering, Faculty of Engineering, Kyushu University

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  • Fe-Cr-C合金の初晶オーステナイトの凝固におけるクロムおよび炭素の分配挙動の解析
  • Fe Cr C ゴウキン ノ ショショウ オーステナイト ノ ギョウコ ニ オ

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The redistribution of chromium and carbon during solidification of primary austenite was evaluated for Fe-Cr-C alloys by a finite difference method. In the calculation, the diffusion of chromium and carbon were estimated in both solid and liquid phases. The equilibrium partition was assumed at the interface between solid and liquid, though the partition coefficients of chromium and carbon varied depending on the alloy contents of liquid phase.<BR>EPMA analysis was also made on Fe-10.84%Cr-0.95%C and Fe-5.34%Cr-0.92%C alloy specimens solidified at a cooling rate of 0.167 K/s to reveal the chromium and carbon distribution in primary austenite. The comparison of experimental values with the calculated ones revealed the diffusion of chromium in austenite was very slow and resulted in the microsegregation, while carbon diffused completely and exhibited uniform distribution in austenite. The partition coefficient of chromium decreased gradually with the increase in the fraction of solid, fS, and that of carbon changed little until fS=0.7 and then gradually decreased. These changes in partition coefficients remarkably influenced the redistribution of elements.

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