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采用热模拟试验、动态再结晶唯象理论和回归分析,研究了HPS485wf桥梁结构钢在温度为1273~1473 K,变形速率为0.1~10 s-1条件下热压缩变形的动态再结晶行为。分析了流变应力的变化规律和加工硬化率-应变图;判断了该钢发生动态软化的类型;得到了形变激活能和临界参数与温度补偿应变速率因子Z之间的关系;建立了相应的高温变形本构关系方程。
The dynamic recrystallization behavior of HPS485wf bridge structural steel under hot compressive deformation at temperature of 1273 ~ 1473 K and deformation rate of 0.1 ~ 10 s-1 was studied by means of thermal simulation test, dynamic recrystallization phenomenological theory and regression analysis. The change rule of flow stress and work-hardening rate-strain diagram are analyzed. The type of dynamic softening of the steel is judged. The relationship between deformation activation energy and critical parameter and temperature-compensated strain rate factor Z is obtained. Correspondingly, Constitutive equation of high temperature deformation.