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采用Gleeble-3500热模拟实验机,对铌微合金钢Q345B进行热压缩实验.基于所获实验结果,充分考虑了热变形工艺参数(应变速率和变形温度)和动态软化机制(动态回复和动态再结晶)对流变应力的影响,建立了一种考虑动态软化机制影响的高温变形显式本构模型,给出了本构方程求解的方法,确定了模型中与工艺参数相关的主要参数的定量关系式;其主要特点是能够较准确地描述材料在高应力区域的动态回复软化阶段、动态再结晶软化阶段和稳定流变阶段的应力应变关系.模型验证表明,所建立模型预测出的流变曲线与实验结果吻合良好.
Based on the experimental results obtained, hot deformation process parameters (strain rate and deformation temperature) and dynamic softening mechanism (dynamic response and dynamic response Crystal) on the flow stress, an explicit constitutive model of high temperature deformation considering the influence of dynamic softening mechanism was established. The method of solving the constitutive equation was given and the quantitative relationship between the parameters of the model and the process parameters The main features of the model are that it can accurately describe the stress-strain relationship of the material during the dynamic recovery softening, dynamic recrystallization softening and steady rheological stages in the high-stress region. The model verification shows that the rheological curve predicted by the established model Good agreement with the experimental results.