Modeling of globular equiaxed solidification with a two-phase approach
Modeling of globular equiaxed solidification with a two-phase approach
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DOI：
10.1007/s11661-002-0241-z
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发表时间：
2002-12-01
影响因子：
2.8
通讯作者：
Wu, MH
中科院分区：
文献类型：
--
作者：
Ludwig, A;Wu, MH
提出了球状等轴凝固的两相体积平均模型。将液体和固体(分散颗粒)视为分离但高度耦合的互穿连续体，求解了两相的质量守恒方程、动量守恒方程、物种质量分数守恒方程和热焓守恒方程。我们还考虑了颗粒密度的守恒性。交换或源项考虑了熔体和固体之间的相互作用，如质量传递(凝固和熔化)、摩擦和阻力、溶质重分配、潜热的释放和成核。模拟了近球形等轴凝固合金(A1-4wtPctCu)的铸锭过程。得到了颗粒演化、熔体对流、沉积、溶质迁移和宏观偏析形成等结果。对产生这些结果的机理进行了详细的讨论。
A two-phase volume averaging model for globular equiaxed solidification is presented. Treating both liquid and solid (disperse grains) as separated but highly coupled interpenetrating continua, we have solved the conservation equations for mass, momentum, species mass fraction, and enthalpy for both phases. We also consider the conservation of grain density. Exchange or source terms take into account interactions between the melt and the solid, such as mass transfer (solidification and melting), friction and drag, Solute redistribution, release of latent heat, and nucleation. An ingot casting with a near globular equiaxed solidification alloy (A 1-4 wt pct Cu) is simulated. Results including grain evolution, melt convection, sedimentation, solute transport, and macrosegregation formation are obtained. The mechanisms producing these results are discussed in detail.