Constitutive Modelling and Processing Map of GH3128 Superalloy during Hot Deformation
Journal of Materials Engineering and Performance(2022)
摘要
The deformation characteristics of GH3128 were explored via tension experiments in the temperature region of 1023-1173 K and strain rate range of 0.001-1 s −1 . The stress decreased as the temperature increased and the strain rate decreased. The obtained strain–stress curves were classified into two types: hardening and hardening–softening curves. To realise the unified prediction of the two types of stress–strain curves, a modified Johnson-Cook (JC)-Zerilli-Armstrong (ZA) constitutive model was established based on the deformation characteristics, in which the modified JC and ZA models were used to express the work-hardening and softening sections, respectively. At the same time, the peak strain was described as a function of ln Z to separate the work-hardening and softening sections. The comparison results suggest that the JC-ZA constitutive model can precisely express flow behaviour. In addition, a hot processing map for the GH3128 alloy was developed. The results showed that the high-energy dissipation region was mainly concentrated in the domain with a lower strain rate and higher temperature, where the instability domains were not included. The optimised working region was determined to be 1098-1173 K and 0.001-0.3 s −1 . Microstructural observations showed that the main deformation mechanism of the stable regions was dynamic recovery (DRV), with a small amount of dynamic recrystallisation (DRX). These studies provided a theoretical basis for the processing design of GH3128 alloy components.
更多查看译文
关键词
constitutive modelling, GH3128 superalloy, hot deformation, processing map
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要