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在Gleebles-1500热模拟试验机上,研究了45Cr4NiMoV合金钢在变形温度为800~1150℃、应变速率为0.002~5 s-1、最大变形量为60%条件下的热变形行为。采用Zener-Hollomon参数法来构建合金的本构模型。通过真应力-应变曲线,发现45Cr4NiMoV合金钢在热压缩变形过程中发生了动态再结晶,分析了温度、应变速率对动态再结晶的影响,并通过金相试验得到了验证。误差分析表明,所建立的本构模型能较好地反映出其高温流变特性。
The thermal deformation behavior of 45Cr4NiMoV alloy steels at 800 ~ 1150 ℃, strain rate of 0.002 ~ 5 s-1 and maximum deformation of 60% was studied on a Gleebles-1500 thermal simulator. The Zener-Hollomon parameter method was used to construct the constitutive model of the alloy. Through the true stress - strain curve, it is found that the dynamic recrystallization of 45Cr4NiMoV alloy during hot compression deformation is analyzed. The influence of temperature and strain rate on dynamic recrystallization is analyzed and verified by metallographic test. Error analysis shows that the established constitutive model can better reflect its high temperature rheological properties.