Microstructure evolution of GH3625 alloy based on Laasraoui-Jonas dislocation density model

doi:10.13251/j.issn.0254-6051.2024.10.034

Abstract

Abstract: To study the microstructural evolution of GH3625 alloy during hot deformation, hot compression tests were conducted on Gleeble-3800 thermal simulation machine under various deformation conditions (deformation temperature of 1030-1130 ℃, strain of 10%-40% and strain rate of 0.01-1.0 s^-1). The strain softening and strain hardening coefficients of the GH3625 alloy were determined by stress-strain curves, leading to the development of Laasraoui-Jonas (L-J) dislocation density model for the GH3625 alloy. The microstructural evolution of the GH3625 alloy during hot deformation was simulated using the cellular automata (CA) module integrated within DEFORM-3D, and the results were compared with the experimental microstructural observations. The results indicate that the flow stress of the GH3625 alloy decreases with the increase of deformation temperature and decrease of strain rate. Analysis combining microstructural observations and CA simulation results shows that significant dynamic recrystallization occurs during hot compression of the GH3625 alloy. As the strain increases, the deformation temperature rises and the strain rate decreases, the volume fraction of dynamic recrystallization increases and the microstructure becomes finer and more uniform. The developed L-J dislocation density model accurately predicts the microstructural evolution of the GH3625 alloy during hot deformation.

Key words: GH3625 alloy, dynamic recrystallization, L-J dislocation density model, microstructure evolution

CLC Number:

TG146.1

Li Bingwei, Yang Xirong, Liu Xiaoyan, Wang Jingzhong, Liu Dan, Yu Chengxi, Bai Tianyu. Microstructure evolution of GH3625 alloy based on Laasraoui-Jonas dislocation density model[J]. Heat Treatment of Metals, 2024, 49(10): 202-210.

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