Equiaxed dendritic solidification with convection .1. Multiscale/multiphase modeling
Equiaxed dendritic solidification with convection .1. Multiscale/multiphase modeling
复制标题
DOI：
10.1007/bf02652369
复制
发表时间：
1996-09-01
影响因子：
2.8
通讯作者：
Beckermann, C
中科院分区：
文献类型：
--
作者：
Wang, CY;Beckermann, C
在三篇系列文章中，我们研究了熔体对流和固相传输条件下的等轴枝晶凝固。在第一部分中，建立了一个多相模型来预测具有等轴形态的合金凝固过程中的成分和组织演变。该模型考虑了宏观(系统)尺度上的输运现象，以及不同微观尺度上的颗粒形核和长大机制。本模型通过考虑液体熔体对流和固相输运，推广了以前的多尺度/多相模型。用体积平均法推导出了固相、枝晶间和枝晶外液相的宏观输运方程，并用补充关系封闭了描述界面转移项的方程。在第二部分中，展示了该模型在矩形腔内Al-Cu合金等轴枝晶凝固中的数值应用。第三部分提供了使用NH4Cl-H2O透明模型合金对模型进行有限的实验验证。
Equiaxed dendritic solidification in the presence of melt convection and solid-phase transport is investigated in a series of three articles. In part I, a multiphase model is developed to predict composition and structure evolution in an alloy solidifying with an equiaxed morphology. The model accounts for the transport phenomena occurring on the macroscopic (system) scale, as well as the grain nucleation and growth mechanisms taking place over various microscopic length scales. The present model generalizes a previous multiscale/multiphase model by including liquid melt convection and solid-phase transport. The macroscopic transport equations for the solid and the interdendritic and extradendritic liquid phases are derived using the volume averaging technique and closed by supplementary relations to describe the interfacial transfer terms. In part II, a numerical application of the model to equiaxed dendritic solidification of an Al-Cu alloy in a rectangular cavity is demonstrated. Limited experimental validation of the model using a NH4Cl-H2O transparent model alloy is provided in part III.