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以Gleeble-1500热物理模拟实验研究为基础,探讨了30CrSiMoVA钢热压缩变形过程中不同变形速率和变形温度对流变应力的影响规律。通过对实验数据进行线性回归分析,确定了30CrSiMoVA钢的应变硬化指数以及形变激活能,拟合出30CrSiMoVA钢高温条件下的流变应力本构方程。此外,采用金相法研究了不同热变形条件对微观组织的影响规律。结果表明,在1050℃、10 s-1热变形条件下,晶粒细化最明显。
Based on the Gleeble-1500 thermophysical simulation experiment, the influence of different deformation rates and deformation temperatures on the flow stress during the hot compressive deformation of 30CrSiMoVA steel was discussed. Through the linear regression analysis of experimental data, the strain hardening index and deformation activation energy of 30CrSiMoVA steel were determined, and the rheological stress constitutive equation of 30CrSiMoVA steel was fitted under high temperature. In addition, the influence of different thermal deformation conditions on the microstructure was studied by the metallographic method. The results show that the grain refinement is the most obvious at 1050 ℃ and 10 s-1 thermal deformation.