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采用单道次热模拟实验分析了各变形参数(初始晶粒尺寸、变形速率、变形温度和变形量)对碳锰钢动态再结晶的影响。结果表明,当初始晶粒越细小、变形温度越高、变形速率越小时,越易发生动态再结晶,同时在能够发生动态再结晶的条件下,变形量越大,动态再结晶越充分。得到了发生动态再结晶时的形变激活能Qdef、临界变形量模型、动态再结晶百分数模型及动态再结晶晶粒尺寸模型。计算得出0ε.5模型的平均误差为3.95%,模型预测值与实验数据计算值符合较好。
Single-pass heat simulation experiments were conducted to analyze the effect of deformation parameters (initial grain size, deformation rate, deformation temperature and deformation) on dynamic recrystallization of carbon-manganese steel. The results show that the dynamic recrystallization is more likely to occur when the initial grain size is finer, the deformation temperature is higher and the deformation rate is smaller, and the more the deformation is, the more dynamic recrystallization is possible under the condition of dynamic recrystallization. The deformation activation energy Qdef, the critical deformation model, the dynamic recrystallization percentage model and the dynamic recrystallization grain size model were obtained when dynamic recrystallization occurred. The average error of 0ε.5 model was calculated to be 3.95%. The predicted values of the model fitted well with the experimental data.