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Problems in Solidification Model for Microsegregation Analysis of Fe-Cr-Ni-Mo-Cu Alloys

机译：Fe-Cr-Ni-Mo-Cu合金微观偏析的凝固模型中的问题

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摘要

Microsegregation of a Fe-Cr-Ni-Mo-Cu alloy was studied with the calculation model on the basis of two-dimensional concept considering diffusion of solutes during and after solidification. The calculated results were compared with the previous experimental results of the microsegregation profiles obtained by random sampling method. At first, a calculation model was created by applying two database sets of diffusion coefficients reported on Fe(γ)-X binary and Fe-Cr-Ni systems. The results using the database of the Fe-Cr-Ni systems fitted the experimental data better than those using the Fe(γ)-X systems in the region of lower solid fraction (fs). Meanwhile, in the higher fs region, the calculated lines passed below the arranged experimental data plots particularly for Cr and Mo. This inconsistency could be attributed to the following problems: (a) Diffusion coefficients might be lower at the post solidification temperature. (b) Partition coefficients might vary with solidification progress. (c) The ratio of the solid/liquid interfacial area to the solid volume might vary with solidification progress. Further, Fe contents analyzed in the previous experiments were rearranged as they simply decreased, while Cr, Ni, Mo and Cu were rearranged dependently with the Fe data at each fs point to keep the law of mass conservation. This rearrangement showed that the "slope segment" appearing in the region of fs below 0.1 in random sampling method was attributed to the probable measurement error.
机译：利用二维模型，考虑了凝固过程中和凝固后溶质的扩散，利用计算模型研究了Fe-Cr-Ni-Mo-Cu合金的微观偏析。将计算结果与通过随机采样方法获得的微偏析图的先前实验结果进行了比较。首先，通过应用在Fe（γ）-X二元体系和Fe-Cr-Ni系统上报告的两个扩散系数数据库集创建计算模型。使用Fe-Cr-Ni系统的数据库在较低固含量（fs）的区域中比使用Fe（γ）-X系统的结果更好地拟合了实验数据。同时，在较高的fs区域中，计算所得的线穿过了布置的实验数据图下方，特别是对于Cr和Mo。这种不一致可能归因于以下问题：（a）凝固后温度下的扩散系数可能较低。 （b）分配系数可能会随着凝固进度而变化。 （c）固/液界面面积与固体体积之比可能会随着固化进度而变化。此外，先前实验中分析的Fe含量随着其含量的下降而重新排列，而Cr，Ni，Mo和Cu在每个fs点处均与Fe数据相关地重新排列，以保持质量守恒定律。这种重排表明，在随机采样方法中出现在低于0.1的fs区域中的“斜率段”归因于可能的测量误差。

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  • 来源
    《ISIJ international》 |2019年第2期|277-282|共6页
  • 作者

    Yusuke KOBAYASHI; Hidekazu TODOROKI; Kenji MIZUNO;

  • 作者单位

    Nippon Yakin Kogyo Co., Ltd., Technical Research Center, 4-2 Kojima-cho, Kawasaki-ku, Kawasaki, Kanagawa, 210-8558 Japan;

    Nippon Yakin Kogyo Co., Ltd., Technical Research Center, 4-2 Kojima-cho, Kawasaki-ku, Kawasaki, Kanagawa, 210-8558 Japan;

    Nippon Yakin Kogyo Co., Ltd., Technical Research Center, 4-2 Kojima-cho, Kawasaki-ku, Kawasaki, Kanagawa, 210-8558 Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    stainless steel; solidification; microsegregation; partition coefficient; diffusion;

    机译：不锈钢;凝固;微偏析分配系数;扩散;

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