Effects of Substitutional Solute Accumulation at α/γ Boundaries on the Growth of Ferrite in Low Carbon Steels
Effects of Substitutional Solute Accumulation at α/γ Boundaries on the Growth of Ferrite in Low Carbon Steels
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DOI：
10.1007/s11661-007-9139-0
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发表时间：
2007-05
期刊：
影响因子：
--
通讯作者：
H. Guo;M. Enomoto
中科院分区：
文献类型：
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作者：
H. Guo;M. Enomoto
研究了Fe-C-X合金中先共析铁素体的长大。pct X，其中X是Mn，Ni，Cr，和Si，是重新审查的溶质阻力使用Hillert-Sundman理论。测量的生长速率的差异从那些计算下的准平衡（PE）以前报道的占考虑到不仅与边界的替代溶质的结合能，但也合金的相变温度。采用固定界面近似法模拟了Fe-C-Mn-Si四元合金中铁素体的生长。这些合金中生长的主要特征，即，初始快速的未分配生长和随后的缓慢分配生长，奥氏体中具有高水平的碳过饱和，被再现为在边界处结合Mn和Si的共偏析。因此，强烈的Mn-Si相互作用可能会增强这些元素在边界处的积累，并产生类似于Fe-C-Mo合金中的生长停滞的生长行为。
The growth of proeutectoid ferrite in Fe-C-X alloys containing ∼3 at. pct X, where X is Mn, Ni, Cr, and Si, is re-examined in terms of solute drag using the Hillert–Sundman theory. The differences of measured growth rates from those calculated under paraequilibrium (PE) reported previously were accounted for taking into account not only the binding energy of substitutional solute with the boundary, but also the transformation temperature of the alloy. The ferrite growth in quaternary Fe-C-Mn-Si alloys was modeled using the stationary-interface approximation for the matrix of finite grain size. The principal features of growth in these alloys,i.e., initial fast unpartitioned growth and subsequent slow partitioned growth with a high level of carbon supersaturation in austenite, were reproduced incorporating cosegregation of Mn and Si at the boundary. Thus, a strong Mn-Si interaction is likely to enhance accumulation of these elements at the boundary and yield the growth behavior that resembles the growth stasis in Fe-C-Mo alloys.