基于Laasraoui-Jonas位错密度模型的GH3625合金组织演变

doi:10.13251/j.issn.0254-6051.2024.10.034

摘要/Abstract

摘要： 为研究GH3625合金热加工过程中的组织演变,在Gleeble-3800热模拟试验机上进行不同变形条件(变形温度1030~1130 ℃、应变量10%~40%及应变速率0.01~1.0 s^-1)的热压缩试验,并通过应力-应变曲线得到GH3625合金的应变软化系数及应变硬化系数,建立了GH3625合金的Laasraoui-Jonas(L-J)位错密度模型。采用DEFORM-3D中集成的元胞自动机(Cellular automata, CA)模块对GH3625合金热变形过程中的微观组织进行有限元模拟,并与试验得到的微观组织进行对比分析。结果表明,GH3625合金的流变应力随着变形温度的升高和应变速率的降低而减小;结合微观组织和元胞自动机模拟结果分析可知,GH3625合金在热压缩过程中发生了明显的动态再结晶,随着应变量的增大、变形温度的升高及应变速率的减小,动态再结晶体积分数增加,组织更细小均匀。所构建的L-J位错密度模型能够较好地预测GH3625合金热变形过程中的组织演变。

关键词: GH3625合金, 动态再结晶, L-J位错密度模型, 组织演变

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

中图分类号:

TG146.1

李冰伟, 杨西荣, 刘晓燕, 王敬忠, 刘丹, 余承希, 白天育. 基于Laasraoui-Jonas位错密度模型的GH3625合金组织演变[J]. 金属热处理, 2024, 49(10): 202-210.

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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