A Macro-micro Coupled Model for Simulation of Aluminum Alloy during Solidification

Xu Lin Yang Xiangjie Guo Hongmin

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A Macro-micro Coupled Model for Simulation of Aluminum Alloy during Solidification
Issue 3, Pages: 37-39(2004)
Published： 2004 ，
DOI：

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[1]许林,杨湘杰,郭洪民.用宏微观耦合模型模拟铝合金凝固过程[J].特种铸造及有色合金,2004(03):37-39+75.

Xu Lin Yang Xiangjie Guo Hongmin. A Macro-micro Coupled Model for Simulation of Aluminum Alloy during Solidification. [J]. Special Casting & Nonferrous Alloys (3):37-39(2004)
[1]许林,杨湘杰,郭洪民.用宏微观耦合模型模拟铝合金凝固过程[J].特种铸造及有色合金,2004(03):37-39+75. DOI：

Xu Lin Yang Xiangjie Guo Hongmin. A Macro-micro Coupled Model for Simulation of Aluminum Alloy during Solidification. [J]. Special Casting & Nonferrous Alloys (3):37-39(2004) DOI：

摘要

用一种宏微观耦合模型对Al 2 .5Si在金属型中的凝固情况进行了模拟。该模型结合改进的元胞自动机模型与有限差分法

考虑了温度场、浓度场和微观生长过程。该改进的元胞自动机模型与经典元胞自动机相比较

不仅考虑了温度场扩散

而且考虑了溶质在液相中的扩散、界面曲率和溶质富集对枝晶尖端过冷度的影响。在宏微观耦合模型中采用大小两套网格分别进行宏观温度场和微观组织演变的计算。在 3种不同的浇注温度下得到了 3种典型的柱状晶向等轴晶转变的图形。考虑边界条件后的模拟结果发现等轴晶的形核情况与理论分析有所差别。

Abstract

A macro-micro coupled model combined with the finite differential method and the modified cellular automaton model is used to simulate the solidification of Al-2.5Si alloy in metallic mold

considering the temperature field

solute field and the growth of dendrite. Compared with the classic cellular automaton

the modified cellular automaton model considered not only the temperature field diffusion

but also effects of the diffusion of solute in liquid and interface curvature as well as the enrichment of solute on supercooling of dendrite tip. Large-grid and small-grid were respectively used to simulate the macro-temperature field and micro\|structure evolution in the coupled model. Three typical images of columnar-to-equiaxed grain transition were obtained at three pouring temperatures. Considering boundary condition

it was showed that the simulated results differed from theoretical analysis in nucleation of equaixed grain