论文部分内容阅读
利用Gleeble-3500热模拟试验机,在850~1180℃温度下,以0.001~20 s-1的应变速率对300M高强钢进行变形量为60%的热压缩变形试验,对其在不同变形条件下的变形行为进行研究。结果表明,300M高强钢的变形行为与变形参数密切相关,变形温度越高,应变速率越低,越有利于动态再结晶的发生。基于试验数据,建立了Arrhenius双曲正弦方程中Q,A,n,α与真应变的本构关系,从而进一步建立了包含变形温度、应变速率及应变在内的300M高强钢的高温变形本构方程。为了验证该本构方程的正确性,对应力计算值与试验值进行了对比及平均误差分析,最大误差为14.2%,但整体均控制在10%以下。分析表明,应用所建立的本构方程得到的应力计算值与试验值吻合较好。
The hot compression deformation test of 300M HSS at a strain rate of 0.001 ~ 20 s-1 with a deformation of 60% was carried out at a temperature of 850 ~ 1180 ℃ using a Gleeble-3500 thermal simulation machine. The deformation behavior of the study. The results show that the deformation behavior of 300M high strength steel is closely related to the deformation parameters. The higher the deformation temperature is, the lower the strain rate is, the more conducive to the occurrence of dynamic recrystallization. Based on the experimental data, the constitutive relation between Q, A, n, α and true strain in the Arrhenius hyperbolic sine equation is established, and the high temperature deformation constitutive of 300M high strength steel including deformation temperature, strain rate and strain is further established equation. In order to verify the correctness of the constitutive equation, the calculated value of stress and the experimental value were compared and the average error was analyzed. The maximum error was 14.2%, but the overall control was below 10%. The analysis shows that the stress calculated by the established constitutive equation is in good agreement with the experimental value.