Transactions of Materials and Heat Treatment

Title：Research on new high temperature constitutive model and quantitative microstructure of delta-processed GH4169 alloy

Authors： Si Jiayong Chen Long Liao Xiaohang Li Zhi

Unit： Central South University of Forestry and Technology

KeyWords： GH4169 alloy delta-processed (DP) constitutive model dynamic recrystallization δ phase

ClassificationCode：TG113.2

year,vol(issue):pagenumber：2017,42(10):180-188

Abstract：

The true stress-true strain curves of delta-processed GH4169 alloy with the deformation temperature of 900-1060 ℃, the strain rate of 0.001-0.5 s-1 and the compression amount of 70% were obtained by the high temperature hot compression tests. Then, the new high temperature constitutive models were established according to the characteristics of rheological curve to define two stages of the work hardening-dynamic recovery and dynamic rheological softening. Furthermore, the deformation microstructure was observed, and the quantitative metallographic analysis was carried out. The results show that the size of dynamic recrystallized grain increases gradually with the increasing of deformation temperature and the decreasing of strain rate. However, the content of δ phase gradually drops and almost disappears at 1060 ℃. Thus, the predicted values and actual test data are highly matched by introducing the standard statistical parameters of the correlation coefficient and the absolute value of average relative error, and the stress values of the delta-processed GH4169 alloy and optimized parameters in the hot forming process are accurately predicted by the new developed constitutive models.

Funds：

湖南省教育厅重点项目（16A220）；湖南省自然科学基金面上项目（2017JJ2403）；湖南省高校科技创新团队支持计划（201485）

作者简介：司家勇 (1978-)，男，博士，副教授，E-mail：sjy98106@163.com

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