Co40NiCrMo合金本构关系的建立

Establishment of constitutive relationship for Co40NiCrMo alloy

根据Co40NiCrMo合金在THERMECMASTOR-Z热模拟机上进行等温压缩试验的数据,研究了Co40NiCrMo合金的本构关系模型,建立了以Zener-Hollomon参数和热变形参数为基本变量的Co40NiCrMo合金本构关系方程。绝大多数情况下误差仅为5%,误差最大值为5.8023%,误差大于5%的情况仅占试验规范的6%左右。所建立的本构关系能正确反映合金对锻造热力参数的动态响应特征,而且可以很好地描述不同应变、应变速率、温度时的应力特征。以Co40NiCrMo合金的金相试验为基础,研究热变形参数对Co40NiCrMo合金微观组织的影响规律,建立Co40NiCrMo合金在高温变形过程中的微观组织演化模型。建立的微观组织演化模型能够较好地反映热态变形时锻造热力参数对Co40NiCrMo合金显微组织演化过程和再结晶晶粒尺寸的影响规律。

The constitutive relationship of Co40NiCrMo alloy was studied based on the experimental results of compression tests carried out on the THERMECMASTOR Z hot work simulation machine, and the constitutive relationship model using the Zener- Hollomon parameter and hot deformation parameters as the primary variable was established. In most instances, the error was less than 5%, and the largest error was 5. 8023%. The equation can reflect the alloy＇s dynamic response character to deforming parameters and represent the stress character in different strain, strain rate and temperature; it can be used for the finite element simulation of plastic forming process and the dissipative structure theory. The effects of process parameters on the microstructure were studied on the basis of metallurgical analysis and the prediction model of microstructure evolution was established. The prediction model of microstructure evolution can reflect the influence of deformation parameters on microstructure.