锻态GH4098高温合金热变形行为与再结晶组织演化规律

doi:10.11896/cldb.24100028

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Abstract The isothermal hot compression tests of the forged GH4098 superalloy were conducted using the Gleeble-3800 thermal-mechanical simulator at strain rates ranging from 0.01 to 10 s^-1 and deformation temperatures between 1 050 ℃ and 1 200 ℃). The constitutive equation and hot processing map of the alloy were established. The microstructural evolution laws during hot deformation under different temperatures (1 050 ℃, 1 100 ℃, 1150 ℃, 1 200 ℃ were analyzed at a high strain rate of 10 s^-1. The constitutive equation and hot processing map of the GH4098 superalloy were derived using the Arrhenius constitutive model and the Zener-Hollomon parameter. The energy dissipation rate of the material reached 37% at strain rates of 0.01 to 0.022 s^-1 and deformation temperatures of 1 050 ℃ to 1 150 ℃. The dynamic recrystallization (DRX) mechanism of the GH4098 superalloy was identified as discontinuous dynamic recrystallization (DDRX) through EBSD microstructural analysis. At temperatures ranging from 1 050 ℃ to 1 150 ℃, both the DRX volume fraction and average grain size increased with rising temperature, with peak values of 80.7% and 8.24 μm, respectively. At 1 200 ℃, the new grains underwent shape changes with increasing strain, promoting the occurrence of secondary recrystallization. This process resulted in a decrease in both the volume fraction of recrystallization and the average grain size. The output of this work indicates that the optimal hot working temperature range is 1 150—1 200 ℃, which could provide a theoretical foundation for the application of the GH4098 superalloy.

Key words： GH4098 superalloy Arrhenius constitutive model dynamic recrystallization (DRX) hot processing map

Published: 25 December 2025 Online: 2025-12-17

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TG135+.1

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	Articles by authors
	ZHANG Zhihui
	WU Shengqing
	YANG Ruize
	WANG Jianqiang
	GUO Yifeng
	LIU Sheng
	XU Bin
	GUO Lili
	SUN Mingyue

Cite this article:

ZHANG Zhihui,WU Shengqing,YANG Ruize, et al. Hot Deformation Behavior and Recrystallization Microstructure Evolution of Forged GH4098 Superalloy[J]. Materials Reports, 2025, 39(24): 24100028-8.

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https://www.mater-rep.com/EN/10.11896/cldb.24100028 OR https://www.mater-rep.com/EN/Y2025/V39/I24/24100028

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