Effect of rolling speed on microstructure and mechanical properties of as-cast AZ31B alloy under different reduction schedules
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- 作者：Yunpeng Ding ; Qichi Le ; qichil@mail.neu.edu.cn" class="auth_mail" title="E-mail the corresponding author ; dapeng1212@126.com" class="auth_mail" title="E-mail the corresponding author ; Zhiqiang Zhang ; Jianzhong Cui
- 关键词：Mg alloy ; Rolling speed ; Recrystallization ; Microstructure ; Mechanical properties
- 刊名：Journal of Materials Processing Technology
- 出版年：2016
- 出版时间：July 2016
- 年：2016
- 卷：233
- 期：Complete
- 页码：161-173
- 全文大小：10323 K
文摘
AZ31B alloy was severely rolled at speeds between 18 and 102 m/min by two different reduction schedules, respectively. The recrystallization behaviors, rolling feasibility, temperature distribution, texture and mechanical properties were examined. The {10
2} tensile twinning and subsequent secondary twinning and continuous dynamic recrystallization dominated the deformation. For 4-pass rolling, as the speed increased, the twin density gradually decreased and the grain size slightly rose due to the suppressed temperature reduction at higher speed. However the effective grain size sharply increased and the recrystallization fraction dropped with increased rolling speed for 2-pass rolling. Full recrystallization mainly occurred in grains with beneficial orientations for {102} twinning, rather than dislocation, during 2-pass rolling at speeds higher than 72 m/min. The rolling feasibility, texture and mechanical properties were largely affected by rolling speed. However, their trends were significantly different, sometimes even on the contrary, under different reduction schedules.
2} tensile twinning and subsequent secondary twinning and continuous dynamic recrystallization dominated the deformation. For 4-pass rolling, as the speed increased, the twin density gradually decreased and the grain size slightly rose due to the suppressed temperature reduction at higher speed. However the effective grain size sharply increased and the recrystallization fraction dropped with increased rolling speed for 2-pass rolling. Full recrystallization mainly occurred in grains with beneficial orientations for {102} twinning, rather than dislocation, during 2-pass rolling at speeds higher than 72 m/min. The rolling feasibility, texture and mechanical properties were largely affected by rolling speed. However, their trends were significantly different, sometimes even on the contrary, under different reduction schedules.