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采用热压缩试验研究了22Cr铸态双相不锈钢在变形温度为1000~1200℃,应变速率为1~50 s-1条件下的热变形行为。为了准确的表征双相不锈钢热变形过程中的力学行为,修正了热压缩过程中摩擦和变形热效应引起的流变应力误差。在此基础上建立了双相不锈钢的流变应力预测模型。该模型通过考虑应变对材料常数(α、n、Q和ln A)的影响,进一步获得了双相不锈钢热变形过程中流变应力与变形温度、应变速率和应变的关系。结果表明:所建立的模型能较好的预测双相不锈钢的热变形行为,预测值与实验值的相关系数为0.995,平均相对误差为4.48%。
The hot deformation behavior of 22Cr as-cast duplex stainless steel was studied by means of hot compression test at deformation temperature of 1000-1200 ℃ and strain rate of 1-50 s-1. In order to accurately characterize the mechanical behavior of duplex stainless steel during hot deformation, the flow stress error caused by the frictional and deformation thermal effects during hot compression was corrected. On this basis, the flow stress prediction model of duplex stainless steel was established. In this model, the relationship between flow stress and deformation temperature, strain rate and strain during the hot deformation of duplex stainless steel was further obtained by considering the effect of strain on the material constants (α, n, Q and ln A). The results show that the established model can better predict the thermal deformation behavior of duplex stainless steel. The correlation coefficient between predicted and experimental values is 0.995 and the average relative error is 4.48%.