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采用Gleeble-1500热模拟实验机研究了70Cr3Mo钢在不同变形条件下的高温压缩热变形行为,变形温度850~1150℃,应变速率0.01~10 s-1。依据实验数据,分析了应力、应变间的关系,建立了流变应力本构方程和加工图。由应力、应变曲线可以得出:变形温度一定时,应力峰值随着应变速率的增加而增加;应变速率一定时,应力峰值随变形温度的增加而降低。计算分析了真应变为0.5的加工图,结果表明,70Cr3Mo钢在热压缩过程中存在两个失稳区:(1)变形温度为850~940℃、应变速率为0.01~1.6 s-1;(2)变形温度为975~1150℃、应变速率为1~10 s-1。并获得了最佳的工艺参数:变形温度为1000~1150℃、应变速率为0.01~0.36 s-1。
The hot deformation behavior of 70Cr3Mo steel under different deformation conditions was studied by Gleeble-1500 thermal simulation machine. The deformation temperature was 850-1150 ℃ and the strain rate was 0.01-10 s-1. Based on the experimental data, the relationship between stress and strain was analyzed, and the constitutive equation of flow stress and the processing diagram were established. From the stress and strain curves, it can be concluded that the stress peak increases with the strain rate at a certain deformation temperature, and decreases with the increase of the strain temperature at a constant strain rate. The results show that there are two destabilization zones in the hot compression process of the 70Cr3Mo steel: (1) the deformation temperature is 850-940 ℃ and the strain rate is 0.01-1.6 s-1; ( 2) Deformation temperature is 975 ~ 1150 ℃, strain rate is 1 ~ 10 s-1. The optimum technological parameters were obtained as follows: deformation temperature 1000 ~ 1150 ℃, strain rate 0.01 ~ 0.36 s-1.