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用Gleeble-1500热模拟试验机研究了Cr8钢在温度为900~1200℃、应变速率为0.005~1 s~(-1)的热变形行为。得到了该材料的真应力应变曲线,基于双曲正弦关系建立了Cr8钢的本构方程,并对本构方程进行验证。结果表明:在变形温度为900~1200℃,应变速率为0.005~0.1 s~(-1)时,Cr8钢发生了明显的动态再结晶现象;所建模型预测的峰值应力与试验所得峰值应力的绝对值误差不超过7%,验证了所建本构方程的准确性;计算得出Cr8钢变形激活能为254.215 k J/mol。
The thermal deformation behavior of Cr8 steel at temperature of 900 ~ 1200 ℃ and strain rate of 0.005 ~ 1 s ~ (-1) was investigated by Gleeble-1500 thermal simulation machine. The true stress-strain curve of this material was obtained. Based on the hyperbolic sine relation, the constitutive equation of Cr8 steel was established and the constitutive equation was verified. The results show that the dynamic recrystallization of Cr8 steel takes place at the deformation temperature of 900-1200 ℃ and the strain rate of 0.005-0.1 s ~ (-1). The peak stress predicted by the model and the peak stress The absolute error is less than 7%, which verifies the accuracy of the constitutive equation. The deformation activation energy of Cr8 steel is calculated to be 254.215 kJ / mol.