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建立了热轧低碳Si-Mn系TRIP钢相变动力学模型。将该模型用于模拟热轧TRIP钢分段冷却过程中显微组织的演变,并定量分析了热变形和冷却速率对热变形奥氏体相变行为的影响。结果表明,预测值与实测值符合较好;降低终轧温度、提高终轧变形量,延长两相区缓冷时间都能促进铁素体相变,从而有利于提高残余奥氏体中的碳含量。
The phase transition kinetic model of hot rolled low carbon Si-Mn TRIP steel was established. The model was used to simulate the microstructure evolution of the hot-rolled TRIP steel during the segmented cooling process. The effect of thermal deformation and cooling rate on the deformation behavior of hot-deformed austenite was quantitatively analyzed. The results show that the predicted value is in good agreement with the measured value. Reducing the finish rolling temperature, increasing the finish rolling deformation and prolonging the slow cooling time of two-phase zone can promote the ferrite transformation, which is beneficial to increase the carbon in retained austenite content.