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采用数值模拟和试验方法研究了变形镁合金ZK60管材挤压成形组织演变规律。根据材料热模拟试验结果,得到了ZK60镁合金动态再结晶组织演变的Yada模型中的相关系数。结果表明,当挤压速度增大时,挤压管材晶粒尺寸减小,变化规律接近线性。当挤压温度增大时,挤压管材晶粒尺寸增大。挤压比增大时,晶粒尺寸减小。晶粒尺寸数值模拟结果与试验结果吻合,最大相对误差小于16%。当温度在300～360℃时,ZK60镁合金发生了完全动态再结晶,晶粒较小且组织均匀,平均晶粒尺寸是原始晶粒尺寸的38%。
The microstructure evolution of deformed magnesium alloy ZK60 pipe was studied by numerical simulation and experimental method. According to the thermal simulation results of the material, the correlation coefficient in Yada model of dynamic recrystallization microstructure of ZK60 magnesium alloy was obtained. The results show that when the extrusion rate increases, the extrusion pipe grain size decreases, the change rule is close to linear. When the extrusion temperature increases, extrusion pipe grain size increases. As the extrusion ratio increases, the grain size decreases. The results of numerical simulation of grain size agree well with the experimental results, and the maximum relative error is less than 16%. When the temperature is between 300 and 360 ℃, the ZK60 magnesium alloy undergoes completely dynamic recrystallization. The grain size is small and uniform, and the average grain size is 38% of the original grain size.