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利用物理模拟实验方法对690合金进行恒温恒速压缩实验,变形温度范围为1050～1250℃,应变速率分别为0.1,1、5,10s-1,获得了合金的流变应力数据,并对合金变形后的组织特征进行了分析。建立了690合金高温热变形的本构方程和动态再结晶模型。结果表明:690合金高温变形时的流变行为可用Zener-Hollomon参数的双曲正弦函数来描述,所建立流变应力本构模型的预测值与实验值吻合较好,建立了690合金的动态再结晶模型,为热挤压过程中的组织控制提供理论依据。
The experiment of constant temperature and constant speed of 690 alloy was carried out by physical simulation experiment. The deformation temperature range was 1050 ~ 1250 ℃, the strain rate was 0.1, 1, 5, 10s-1 respectively. The flow stress data of the alloy were obtained. Deformed tissue characteristics were analyzed. The constitutive equation and dynamic recrystallization model of high temperature hot deformation of 690 alloy have been established. The results show that the rheological behavior of 690 alloy during high temperature deformation can be described by the hyperbolic sine function of Zener-Hollomon parameter. The predictive value of the constitutive model of flow stress is in good agreement with the experimental data, and the dynamic Crystallization model for the hot extrusion process to provide a theoretical basis for the organization control.