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利用Gleeble-1500热模拟试验机对调质钢07MnNiCrMoVDR在变形温度400~750℃、变形速率为0.01~0.1 s-1下进行低温热变形模拟试验,获得不同变形条件下的流动应力-应变曲线。对试验数据进行分析,确定了影响流动应力的主要因素。通过试验结果计算拟合了模型参数,并根据Sellars-Tegart的方程分别建立低温区加工硬化-动态回复和动态再结晶流动应力模型。该模型能预测低温流动应力,完整地表示07MnNiCrMoVDR钢低温流动应力模型。将模型应用于中厚板矫直力计算,预测值与实测值吻合较好。
The Gleeble-1500 thermal simulator was used to simulate the low temperature deformation of quenched and temper steel 07MnNiCrMoVDR at deformation temperature of 400-750 ℃ and deformation rate of 0.01-0.1 s-1. The flow stress-strain curves under different deformation conditions were obtained. The experimental data were analyzed to determine the main factors that affect the flow stress. Based on the experimental results, the parameters of the model were fitted and the flow stress models of work hardening-dynamic recovery and dynamic recrystallization were established respectively according to Sellars-Tegart equation. The model can predict low temperature flow stress and completely represent the low temperature flow stress model of 07MnNiCrMoVDR steel. The model is applied to calculate the straightening force of plate, the predicted value is in good agreement with the measured value.