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在轧制温度350℃和轧制速度0.5 m/s条件下,分别以20%,30%,40%的压下量对铸轧态AZ31B镁合金板进行了轧制实验,对比了轧制后的微观组织,探究在不同压下量下镁合金板边部和中部区域微观组织变化及其产生原因。结合CA(元胞自动机)数学模型对镁合金的动态再结晶过程进行了数值模拟。结果表明:区域应力场变化所引起的空洞聚集是轧制裂纹扩展的主要原因之一;镁合金板中部和边部晶粒尺寸值平均减小幅度为39.6%和55.5%;CA数值模拟结果预测精度较高,平均相对预测误差在16.03%以内。
Under the conditions of the rolling temperature of 350 ℃ and the rolling speed of 0.5 m / s, the rolling experiments of the as-cast AZ31B magnesium alloy plates were carried out with the reduction of 20%, 30% and 40%, respectively. The microstructure of the magnesium alloy sheet at different reduction rates was investigated and the reasons for its occurrence were analyzed. The dynamic recrystallization process of magnesium alloy was numerically simulated with CA (cellular automaton) mathematical model. The results show that the cavity accumulation caused by the change of regional stress field is one of the main reasons for the crack growth. The average grain size decreases by 39.6% and 55.5% in the middle and the edge of the magnesium alloy sheet respectively. The accuracy is high, and the average relative prediction error is within 16.03%.