Plastic deformation of AZ91D magnesium alloy and recrystallization structure simulation in heated roll rolling

被引：0
|
作者：
Mei R.-B. [1 ,2 ]
Shi X.-L. [2 ]
Bao L. [2 ]
Li C.-S. [1 ]
Liu X.-H. [1 ]
机构：
[1] State Key Laboratory of Rolling and Automation, Northeastern University, Shenyang
[2] School of Resources and Materials, Northeastern University at Qinhuangdao, Qinhuangdao
来源：
Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2022年 / 32卷 / 05期
关键词：
Dynamic recrystallization; Heated rolling; Magnesium alloy strips; Microstructure; Numerical simulation;
D O I：
10.11817/j.ysxb.1004.0609.2021-41073
中图分类号：
学科分类号：
摘要：
The hot deformation behavior of AZ91D magnesium alloy was studied using single-pass compression experiments at temperature of 200-450 ℃ and strain rate of 0.001-1 s-1. An exponential function model was proposed to describe the dynamic recrystallization volume fraction equations of AZ91D magnesium alloy based on stress-strain curves. The numerical simulation of microstructure in heated roll rolling of magnesium alloy was realized through embedding the developed program into the finite element software platform. The results show that, with the increase of roll surface temperature and reduction, the dynamic recrystallization volume fraction increases obviously, and the dynamic recrystallization is incomplete during single pass rolling. The multi-pass rolling process is conducive to the full occurrence of dynamic recrystallization. When the roll surface temperature is 300 ℃, the dynamic recrystallization fraction is close to 85% after three passes of heated roll rolling, and the dynamic recrystallization is completed after five passes. Furthermore, the dynamic recrystallization grain sizes will grow up with more rolling passes than three passes or higher roll surface temperature than 350 ℃. The measured results are in agreement with the values predicted by the model, and the dynamic recrystallization model is significant to microstructure simulation and parameter optimization of AZ91D alloy in hot plastic deformation. © 2022, China Science Publishing & Media Ltd. All right reserved.
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页码：1289 / 1301
页数：12
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