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为研究一种锻造斗齿用新型低合金耐磨钢高温热变形行为,采用Gleeble-1500D热模拟试验机对其试样进行等温压缩试验,获取在变形温度为1173~1473 K、应变速率为0.01~10 s-1下的真应力-真应变曲线,对高温流动应力特征进行研究,分析了高温热变形行为的物理本质,拟合计算材料本构方程中的参数值,为斗齿锻造成形工艺的数值模拟提供材料性能数据。研究结果表明:热变形温度区间内,当应变速率一定时,该材料的流动应力随着变形温度的升高而减小;当变形温度一定时,该材料的流动应力随着应变速率的增大而增大;本构方程能够比较精确地描述材料在热变形过程中的流动应力,预测值与实验值的平均相对误差为2.29%,最大仅为5.37%。
In order to study a high-temperature hot deformation behavior of a new low-alloy wear-resistant steel forged bucket teeth, the specimens were subjected to isothermal compression tests using a Gleeble-1500D thermal simulation testing machine. The deformation temperature was 1173-1473 K and the strain rate was 0.01 ~ 10 s-1 under true stress-true strain curve, the high-temperature flow stress characteristics are studied, the physical nature of high temperature thermal deformation behavior is analyzed, and the parameter values in the constitutive equation of the material are fitted to calculate the tooth forging forming process The numerical simulation provides material performance data. The results show that when the strain rate is constant, the flow stress of the material decreases with the increase of the deformation temperature. When the deformation temperature is constant, the flow stress of the material increases with the increase of the strain rate The constitutive equation can describe the flow stress of the material more accurately during thermal deformation. The average relative error between the predicted value and the experimental value is 2.29% and the maximum is only 5.37%.