GH6159高温合金热变形行为及动态再结晶建模与仿真研究

曾祥; 廖润泽; 徐雪峰; 涂啟啟; 陈霄霄; 罗杰; 范旭; 黄乐亨; 刘杰

doi:10.3969/j.issn.1674-6457.2025.07.021

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精密成形工程 ›› 2025, Vol. 17 ›› Issue (7) : 193-205. DOI: 10.3969/j.issn.1674-6457.2025.07.021

高温合金成形

GH6159高温合金热变形行为及动态再结晶建模与仿真研究

曾祥^1a,1b,*, 廖润泽^1a, 徐雪峰^1a, 涂啟啟², 陈霄霄², 罗杰², 范旭², 黄乐亨^1a, 刘杰^1a

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Hot Deformation Behavior and Dynamic Recrystallization Modeling and Simulation of GH6159 Superalloy

ZENG Xiang^1a,1b,*, LIAO Runze^1a, XU Xuefeng^1a, TU Qiqi², CHEN Xiaoxiao², LUO Jie², FAN Xu², HUANG Leheng^1a, LIU Jie^1a

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文章历史 +

摘要

目的通过热压缩实验和微观组织分析,获得GH6159高温合金变形行为和组织演变规律,为优化热加工工艺提供理论支持。方法利用Thermecmastor-Z热模拟试验机对GH6159高温合金进行热压缩实验,获得该合金在应变速率0.1~10 s^-1和温度900~1 100 ℃条件下的应力-应变曲线,分别采用摩擦修正与变形热修正公式对真应力-真应变曲线进行修正,并建立修正后的Arrhenius模型和动态再结晶模型;同时,通过电子背散射衍射技术（EBSD）,分析不同温度和应变速率下试样的微观组织特征,随后建立了GH6159高温合金圆柱压缩有限元模型,利用所建立的动态再结晶模型,预测GH6159高温合金在热加工过程中的动态再结晶行为。结果热变形时,GH6159高温合金表现出明显的流动软化现象,微观组织中出现了大量的动态再结晶。通过仿真预测和实验对比发现,经900 ℃-0.01 s^-1、1 100 ℃-0.01 s^-1、900 ℃-10 s^-1、1 100 ℃-10 s^-1热压缩变形后,动态再结晶体积分数分别为81.3%、83.7%、78.5%、82.7%,基本与EBSD实验结果一致。结论动态再结晶体积分数对变形温度和应变速率较为敏感,在低温高应变速率下,动态再结晶体积分数低且组织均匀性差;在高温低应变速率下,动态再结晶体积分数高且组织均匀性好。通过实验和有限元模拟发现,所建立的动态再结晶模型具有较高精度。

Abstract

The work aims to obtain the deformation behavior and microstructure evolution laws of GH6159 superalloy through hot compression experiments and microstructure analysis, to provide theoretical support for optimizing the hot working process. Thus, a study on microstructure evolution laws of GH6159 was carried out. Thermal compression experiments were carried out on GH6159 superalloy with a Thermecmastor-Z thermal simulation tester to obtain the stress-strain curves of the alloy at 0.1-10 s^-1 and 900-1 100 ℃. True stress-true strain curves were modified using frictional and deformation-thermal corrections formulae, and modified Arrhenius model and dynamic recrystallization (DRX) model were established. Meanwhile, the microstructure characteristics of specimens at different temperature and strain rates were analyzed by Electron Backscatter Diffraction (EBSD). Then, a finite element compression model of GH6159 superalloy was established. DRX behavior of GH6159 superalloy in the hot working process was predicted with the established DRX model. GH6159 superalloy exhibited an obvious flow softening phenomenon and a large amount of DRX appeared during hot deformation. Via simulation prediction and experimental comparison, DRX volume fractions were 81.3%, 83.7%, 78.5%, and 82.7% at 900 ℃-0.01 s^-1, 1 100 ℃- 0.01 s^-1, 900 ℃-10 s^-1, and 1 100 ℃-10 s^-1, respectively, which agreed well with the results of EBSD. The DRX volume fraction is sensitive to deformation temperature and strain rates. High strain rates and low temperature show low dynamic recrystallization volume fraction and poor microstructure homogeneity, while the dynamic recrystallization volume fraction is high and microstructure homogeneity is good at low strain rates and high temperature. The established dynamic recrystallization model has a high accuracy by comparison of experiment and finite element simulation.

导出引用

曾祥, 廖润泽, 徐雪峰, 涂啟啟, 陈霄霄, 罗杰, 范旭, 黄乐亨, 刘杰. GH6159高温合金热变形行为及动态再结晶建模与仿真研究[J]. 精密成形工程. 2025, 17(7): 193-205 https://doi.org/10.3969/j.issn.1674-6457.2025.07.021

ZENG Xiang, LIAO Runze, XU Xuefeng, TU Qiqi, CHEN Xiaoxiao, LUO Jie, FAN Xu, HUANG Leheng, LIU Jie. Hot Deformation Behavior and Dynamic Recrystallization Modeling and Simulation of GH6159 Superalloy[J]. Journal of Netshape Forming Engineering. 2025, 17(7): 193-205 https://doi.org/10.3969/j.issn.1674-6457.2025.07.021

中图分类号： TG146.1

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