基于准固相区多场仿真的镁合金压铸件热裂成因分析

郑金星; 王成勇; 刘全坤; 李杨德

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基于准固相区多场仿真的镁合金压铸件热裂成因分析
Hot Tearing Formation Analysis of Die Casting Magnesium Alloy Parts Based on Multi-physical Field Simulation in Quasi-solid Phase Region
2010年30卷第9期页码：835-839
纸质出版日期： 2010 ，
DOI：

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[1]郑金星,王成勇,刘全坤,李杨德.基于准固相区多场仿真的镁合金压铸件热裂成因分析[J].特种铸造及有色合金,2010,30(09):835-839+781.

Zheng Jinxing1, Wang Chengyong1, Liu Quankun1, et al. Hot Tearing Formation Analysis of Die Casting Magnesium Alloy Parts Based on Multi-physical Field Simulation in Quasi-solid Phase Region[J]. Special Casting & Nonferrous Alloys, 2010,30(9):835-839.
[1]郑金星,王成勇,刘全坤,李杨德.基于准固相区多场仿真的镁合金压铸件热裂成因分析[J].特种铸造及有色合金,2010,30(09):835-839+781. DOI：

Zheng Jinxing1, Wang Chengyong1, Liu Quankun1, et al. Hot Tearing Formation Analysis of Die Casting Magnesium Alloy Parts Based on Multi-physical Field Simulation in Quasi-solid Phase Region[J]. Special Casting & Nonferrous Alloys, 2010,30(9):835-839. DOI：

摘要

对镁合金支撑件压铸模结构改进前后的压铸成形过程进行仿真分析

根据建立的镁合金准固相区多物理场参数模型

综合预测特征区域的凝固场、温度场、应力场在准固相区的变化规律

重点分析准固相区温度梯度、等效应力-屈服强度（-σ-σs）和最大主应力-抗拉强度（σ1-σb）3方面的变化趋势

分析热裂纹成因以及热裂纹区域多物理场变化规律。试验结果与仿真分析结果基本一致。

Abstract

Die casting process before and after modification for magnesium alloy absorber bracket was simulated by a software. Based on established magnesium alloy multi-physical filed modeling in quasi-solid region （90%<fs<100%）

change of solidification field

temperature field and stress field in the quasi-solid region was predicted

focusing on the change principle of quasi-solid region temperature gradient

equivalent stress-yield strength and maximum main stress-tensile strength. Formation of hot tearing and change of multi-physical field in hot-tearing zone were analyzed. The simulated results are well in agreement with experimental ones.