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采用Gleeble3500热模拟试验机对95CrMo钢进行了等温单向热压缩试验,得到了其在应变速率为0.1、1和10 s-1,变形温度为750~1050℃时的流变应力曲线。结果表明,应变量、变形温度和应变速率对95CrMo钢流变应力的影响是通过动态回复和动态再结晶软化机制造成的,这种软化机制是三者共同作用的结果。基于试验结果,建立了一种同时考虑应变量补偿、变形温度补偿和应变速率补偿的95CrMo钢流变应力本构方程。从相关系数、平均相对误差和标准偏差3个方面将该方程与周纪华-管克制模型进行了对比,发现该本构方程相比周纪华-管克智模型具有更高的精度和可靠性,更适用于数值仿真领域。
The uniaxial hot compression tests of 95CrMo steel were carried out by using Gleeble3500 thermal simulator. The rheological stress curves of 95CrMo steel at strain rates of 0.1, 1 and 10 s-1 and deformation temperatures of 750 to 1050 ℃ were obtained. The results show that the influence of strain, deformation temperature and strain rate on the flow stress of 95CrMo steel is caused by the dynamic recovery and dynamic recrystallization softening mechanism. The softening mechanism is the result of the combination of the three. Based on the experimental results, a constitutive equation of flow stress of 95CrMo steel with strain compensation, strain temperature compensation and strain rate compensation is established. This equation is compared with the model of Zhoujihua-Guanke control from three aspects of correlation coefficient, average relative error and standard deviation. It is found that the constitutive equation is more accurate and reliable than Zhoujihua-Guankezhi model In the field of numerical simulation.