Abstract：Based on practically press-working technology,the eleven-pass continuous hot rolling process of direct-chilled AZ31B magnesium alloy with the distributions of stress field,strain field and temperature field was simulated using rigid-plastic thermal-mechanic finite element method(FEM)with a DEFORMTM software.The results show that the stress,strain and temperature distribute inhomogenously along the thickness direction of the ingot during the hot rolling process.Great strain value is obtained as a result of high stress at the surface where the AZ31B alloy ingot contacts with the mill roller.But the stress and strain are relatively low at the centre of the alloy ingot.During a single hot rolling within the continuous process,stress obtains a maximum value when the ingot first touches the mill roller.The stress changes slightly during the rolling process but will decrease at the end of rolling.The equivalent stress distributes homogeneously after hot rolling 9 passes,and increases gradually with the increasing of pass.Comparisons show that experimental data get a good match with numerical simulation results during multi-pass hot rolling of AZ31B alloy.The flow stress of multi-pass increases gradually and reaches a steady-state subsequently at low strain rates(0.01,0.1s-1).But work hardening is obviously at the first three pass at high strain rates(5,10s-1),and then evidently softening occurs between the passes.
余琨, 蔡志勇, 王晓艳, 史褆, 黎文献. 半连续铸造AZ31B镁合金连续热轧变形行为的数值模拟[J]. 材料工程, 2010, 0(9): 33-39.
YU Kun, CAI Zhi-yong, WANG Xiao-yan, SHI Ti, LI Wen-xian. Simulation of Multi-pass Hot Rolling Process of Direct-chilled AZ31B Magnesium Alloy. Journal of Materials Engineering, 2010, 0(9): 33-39.
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