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采用等压法,通过等温热压缩实验获得了AZ31镁合金变形温度和应变速率分别在473~673 K和0.005~5 s-1条件下对临界断裂应变的影响规律,以及Zener-Hollomon表达式,据此针对AZ31建立了临界断裂应变与变形温度和应变速率间的基本模型;在此基础上,基于镁合金轧制边裂的基本机理,引入Cockcroft&Latham断裂准则,建立了含有材料变形激活能和基本轧制工艺参数的AZ31镁合金轧制边裂预判模型;并通过相同条件下有限元模拟和热轧试验分别得到沿板宽方向损伤值和边部裂纹深度,以此对所建立的边裂预判模型进行验证,结果显示所建立边裂预判模型的预测值和实测值平均误差为11.3%。
The effect of deformation temperature and strain rate of AZ31 magnesium alloy on critical strain at 473 ~ 673 K and 0.005 ~ 5 s-1 was obtained by isothermal compression test. The Zener-Hollomon equation , Based on which the basic model of critical strain and deformation temperature and strain rate was set up for AZ31. Based on the basic mechanism of magnesium alloy rolling edge cracking, the Cockcroft & Latham fracture criterion was introduced to establish a model with deformation activation energy and Basic rolling parameters of AZ31 magnesium alloy rolling edge crack prediction model; and through the same conditions of finite element simulation and hot rolling test were obtained along the width direction of the damage value and the edge of the crack depth, thus the established edge The results show that the average error between the predicted value and the measured value is 11.3%.