Simulation of Corrugated Rolling of Mg/Al Composite Plates and Analysis of Microstructure Evolution in Deformation Zone

doi:10.3969/j.issn.1004-132X.2021.22.010

Abstract

Abstract: By establishing the thermal-mechanical coupled finite element model of corrugated rolling of Mg/Al composite plates, the rolling block experiment was carried out. The effects of stress, strain and temperature on metal deformation and microstructure evolution were analyzed. The results show that the composite plates are bonded near the exit of deformation zones when the initial rolling temperature is as 400 ℃ and the average reduction rate is as 35%. The thickness of diffusion layer at the trough is as 3.3 μm, and the diffusion layer at the peak is as 2.7 μm. The increases of equivalent strain and temperature promote the dynamic recrystallization of the deformed grains of magnesium alloy. The microstructure mainly includes equiaxed grains, twins and dynamic recrystallization grains. The average grain sizes are as 3.71 μm and 6.92 μm at the trough and peak respectively.

Key words: corrugated rolling, rolling block experiment, finite element simulation, microstructure evolution

摘要： 通过建立Mg/Al复合板波纹轧热力耦合有限元模型并进行轧卡实验，分析了应力、应变及温度对金属变形以及微观组织演变的影响。结果表明，当波纹轧初始轧制温度为400 ℃、平均压下率为35%时，复合板在变形区靠近出口位置实现复合，复合界面波谷处扩散层厚度为3.3 μm，波峰处扩散层为2.7 μm;等效应变和温度的增加促进了镁合金的变形晶粒发生动态再结晶，其微观组织主要包括等轴晶、孪晶以及动态再结晶晶粒，界面波谷处晶粒平均尺寸为3.71 μm，波峰处为6.92 μm。

关键词: 波纹辊轧制, 轧卡实验, 有限元模拟, 微观组织演变

CLC Number:

TG335.5

SHEN Hongzhuo, LIU Yuanming, LIU Yanxiao, WANG Tao, LIU Yanping, . Simulation of Corrugated Rolling of Mg/Al Composite Plates and Analysis of Microstructure Evolution in Deformation Zone[J]. China Mechanical Engineering, 2021, 32(22): 2731-2738.

申宏卓, 刘元铭, 刘延啸, 王涛, 刘燕萍, . Mg/Al复合板波纹轧模拟及变形区微观组织演变分析[J]. 中国机械工程, 2021, 32(22): 2731-2738.

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