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在DIL805A/T热模拟机上对低碳合金钢20CrNi2Mo进行等温单向热压缩试验,研究了该钢在温度为900~1 050℃、应变速率为0.001~1 s~(-1)条件下的应变补偿本构方程及动态再结晶行为,为探索塑性变形行为和组织控制提供理论指导。对应变补偿本构方程进行验证发现,考虑应变补偿后得到的应力值与试验值的线性相关系数R=0.992 1,平均相对误差AARE为3.019 2%;采用对θ-σ曲线进行3次多项式拟和求解拐点的方法,建立了临界动态再结晶模型,并结合微观组织分析了不同变形条件下动态再结晶进行的难易程度。结果表明,20CrNi2Mo钢在试验条件范围内全部发生了动态再结晶,且变形温度越高,应变速率越小,动态再结晶进行得越充分,并建立了Z参数动态再结晶临界应力模型和临界应变模型。
The uniaxial hot compression test of low carbon alloy steel 20CrNi2Mo was carried out on a DIL805A / T thermal simulator. The strain of the steel at 900-10000 ℃ and the strain rate of 0.001 ~ 1 s ~ (-1) was investigated. Compensate constitutive equation and dynamic recrystallization behavior, and provide theoretical guidance for exploring plastic deformation behavior and organization control. The strain compensation constitutive equation is verified and found that the linear correlation coefficient between the stress value and the experimental value after considering the strain compensation is R = 0.992 1, the average relative error AARE is 3.019 2%, and the third-order polynomial simulation And the method of solving inflection point, a critical dynamic recrystallization model was established, and the degree of difficulty of dynamic recrystallization under different deformation conditions was analyzed by combining with microstructure. The results show that the dynamic recrystallization of 20CrNi2Mo steel takes place within the experimental conditions. The higher the deformation temperature and the smaller the strain rate, the more dynamic recrystallization proceeds, and the Z-parameter dynamic recrystallization critical stress model and critical strain model.