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采用热模拟试验机对Q345B铌微合金钢进行热压缩试验,根据试验结果,充分考虑热变形应变速率和变形温度对流变应力的影响,并在Johnson-Cook本构方程的基础上,对Q345B铌微合金钢的Johnson-Cook本构方程中的参数进行标定,方程预测表明流变应力与试验值一致,应力变化趋势相同。在此基础上建立三维有限元压缩模型,有限元模拟结果显示,计算的压缩应力应变曲线与实验测定曲线一致,表明了本构方程在有限元计算中的有效性和可行性,这可为其他模拟轧制计算提供材料的流变应力模型。
Based on the test results, the effect of strain rate and deformation temperature on the flow stress was investigated. Based on the Johnson-Cook constitutive equation, the effect of heat treatment on the microstructure of Q345B niobium microalloyed steel was investigated. The parameters in the Johnson-Cook constitutive equation for microalloyed steels are calibrated. The equation predictions show that the flow stress is consistent with the experimental values and the stress changes are the same. On this basis, a three-dimensional finite element compression model is established. The results of finite element simulation show that the calculated compressive stress-strain curve is consistent with the experimental determination curve, indicating the validity and feasibility of the constitutive equation in the finite element calculation, which can be used for other Simulated rolling calculations provide a material flow stress model.