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在变形温度250~450℃、变形速率0.005~5 s-1条件下对铸态AZ31B镁合金进行了圆柱体高温压缩实验,研究变形温度、变形速率以及变形程度对变形抗力的影响规律。利用周纪华变形抗力数学模型进行拟合求解,分析影响该模型拟合误差的主要变量并据此提出改进的适用于AZ31B镁合金的变形抗力数学模型。研究结果表明:随着变形程度的增大,AZ31B镁合金材料变形抗力呈先增大后减小直至平衡的变化规律。随着变形温度的降低和变形速率的增大,变形抗力呈增大趋势。周纪华变形抗力模型的拟合相关系数为0.90,模型的平均相对误差为16.3%。变形程度是影响周纪华变形抗力模型拟合精度的主要因素,据此提出的改进的周纪华变形抗力模型的拟合相关系数为0.96,平均相对误差为7.8%,具有较高的预测精度,能够准确地表征AZ31B镁合金变形抗力的变化规律。
Under the conditions of deformation temperature of 250-450 ℃ and deformation rate of 0.005-5 s-1, the as-cast AZ31B magnesium alloy was subjected to high temperature cylinder compression test. The effects of deformation temperature, deformation rate and degree of deformation on deformation resistance were studied. The mathematical model of deformation resistance of Zhou Jihua was used to solve the fitting problem. The main variables affecting the fitting error of the model were analyzed and the improved mathematical model of deformation resistance was proposed for AZ31B magnesium alloy. The results show that with the increase of deformation, the deformation resistance of AZ31B magnesium alloy first increases and then decreases until the equilibrium changes. As the deformation temperature decreases and the deformation rate increases, the deformation resistance increases. The fitting correlation coefficient of Zhou Jihua’s deformation resistance model was 0.90 and the average relative error of the model was 16.3%. The degree of deformation is the main factor affecting the fitting precision of the deformation resistance model of Zhou Jihua. The fitting correlation coefficient of the improved model of Zhou Jihua deformation resistance is 0.96, the average relative error is 7.8%, with a high prediction accuracy, Characterization of AZ31B magnesium alloy deformation resistance changes.