Three‐dimensional Simulation of Thermosolutal Convection and Macrosegregation in Steel Ingots
Three‐dimensional Simulation of Thermosolutal Convection and Macrosegregation in Steel Ingots
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DOI：
10.1002/srin.201000038
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发表时间：
2010-11
影响因子：
2.2
通讯作者：
W. S. Li;H. Shen;B. Liu
中科院分区：
文献类型：
--
作者：
W. S. Li;H. Shen;B. Liu
对钢锭凝固过程中的热溶质对流和宏观偏析的形成进行了三维数值模拟。模拟是基于一个完全耦合的模型，质量，动量，能量和物种守恒方程。两相区枝晶间流动遵循达西定律，渗透率项采用插值液相分数法离散。将Pb‐Sn合金宏观偏析基准测试的数值结果与文献中的实验数据进行了比较。将该模型应用于工业钢锭凝固过程的数值模拟。初步预测，包括在热顶的正偏析，和锥形形状的负偏析区在底部的锭。碳的偏析比沿沿着锭的垂直中心线的预测变化进行了比较与测量，并观察到一般良好的协议。今后应注意的是，通过考虑复杂的凝固问题，如自由等轴晶的沉积和缩孔的形成预测精度。
Thermosolutal convection and macrosegregation formation during the solidification of steel ingots are numerically simulated in three dimensions. The simulation is based on a fully coupled model for mass, momentum, energy, and species conservation equations. The interdendritic flow in the mushy zone is governed by Darcy's law, and the permeability term is discretized using an interpolated liquid fraction method. The numerical results for a benchmark test of macrosegregation in a Pb‐Sn alloy are compared with experimental data taken from the literature. The present model is applied to simulate the solidification of industrial steel ingots. Preliminary predictions are obtained, including the positive segregation in the hot top, and the conically shaped negative segregation zone at the bottom of the ingot. The predicted variation of the segregation ratio in carbon along the vertical centreline of an ingot is compared with measurements, and generally good agreement is observed. Future attention should be paid to the precision of prediction by considering complex solidification issues, such as the sedimentation of free equiaxed grains and the formation of shrinkage cavity.