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在Gleeble-3500热模拟机上采用双道次热压缩试验,研究50Cr5MoV轧辊钢高温变形道次间隔时间内的静态软化行为,通过应力补偿法计算静态再结晶体积分数,分析热变形温度、应变速率、变形程度以及初始奥氏体晶粒尺寸对静态再结晶体积分数的影响,并建立50Cr5MoV轧辊钢的静态再结晶动力学模型,获得静态再结晶激活能191.85 k J/mol。结果表明:变形温度、应变速率、变形程度和道次间隔时间对静态再结晶体积分数影响较大,而初始奥氏体晶粒尺寸对静态再结晶体积分数影响很小;将静态再结晶动力学模型的预测值与实测值进行比较,二者吻合较好。
In the Gleeble-3500 thermal simulator, the double-pass thermal compression test was used to study the static softening behavior of the 50Cr5MoV roll steel during the high-temperature deformation passes. The static recrystallization volume fraction was calculated by stress compensation method. The thermal deformation temperature, strain rate, The degree of deformation and the initial austenite grain size on the static recrystallization volume fraction were investigated. The static recrystallization kinetics model of 50Cr5MoV steel was established and the static recrystallization activation energy was 191.85 kJ / mol. The results show that the deformation temperature, the strain rate, the degree of deformation and the interpass time greatly influence the volume fraction of static recrystallization, while the initial austenite grain size has little effect on the volume fraction of static recrystallization. The static recrystallization kinetics The predicted value of the model is compared with the measured value, which is in good agreement.