OALib Journal期刊
Fe-Bi-Mn三元合金多相相变-扩散体系中易切削相析出规律的数值研究
DOI: 10.11900/0412.1961.2014.00200
Keywords: Fe-Bi-Mn三元合金 ,凝固 ,多相相变 ,多相扩散路径 ,数值研究
Abstract:
以扩散支配相变动力学方法为基础,建立了多相三维流动凝固模型.模型考虑了固、液、气三相扩散相变对Fe-Bi-Mn三元合金凝固的影响,模拟研究了合金体系中Bi和MnS易切削相的析出过程,并分析了易切削相的多相相变过程和多相扩散路径.结果表明易切削相的析出过程受多相相变-扩散作用影响,Mls,MnS(MnS的固-液质量相变速率)较大,MnS的分配系数大而扩散系数小,当C*s,MnS(MnS的固相界面浓度)大于Cl,MnS(MnS的液相浓度)时,液相MnS在固-液界面处浓度降低,最终被固相完全“捕获”,导致MnS不再富集;Mls,Bi(Bi的固-液质量相变速率)较小且Mgl,Bi(Bi的液-气质量相变速率)为负值,Bi的分配系数小而扩散系数大,凝固过程中存在气相Bi且Cl,Bi(Bi的液相浓度)始终大于C*s,Bi(Bi的固相界面浓度),故Bi持续流动富集于MnS周围,直至凝固结束.研究工作将模拟结果与实验结果进行了对比,两者吻合较好.
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