采用Gleeble-3500热模拟试验机模拟了屈服强度550 MPa级桥梁钢轧板单道次热压缩变形过程,得到了试验钢的真应力-真应变曲线,分析了变形温度和应变速率对动态再结晶行为的影响,并建立了试验钢的再结晶图。结果表明,在较高的变形温度和较低的应变速率下,动态再结晶易进行。实验在动态再结晶激活能为460.14 kJ/mol时,建立了试验钢动态再结晶动力学模型。 The Gleeble-3500 thermal simulation testing machine was used to simulate the single-pass hot compression deformation process of steel plate with 550 MPa yield strength. The true stress-strain curve of the test steel was obtained. The effect of deformation temperature and strain rate on dynamic recrystallization Behavior, and established the recrystallization of the test steel. The results show that dynamic recrystallization is easy at higher deformation temperature and lower strain rate. The dynamic recrystallization kinetics model of the test steel was established when the dynamic recrystallization activation energy was 460.14 kJ / mol.