Hot Deformation Behavior and Recrystallization Microstructure Evolution of Forged GH4098 Superalloy
ZHANG Zhihui1,3, WU Shengqing2, YANG Ruize3, WANG Jianqiang4, GUO Yifeng4, LIU Sheng4,*, XU Bin2,GUO Lili1,*, SUN Mingyue2
1 College of Materials Science and Engineering, Dalian Jiaotong University, Dalian 116028, Liaoning, China 2 Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China 3 Yangtze Delta Region Institute of Advanced Materials, Suzhou 215000, Jiangsu, China 4 Suzhou Laboratory, Suzhou 215123, Jiangsu, China
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.
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2025, Vol. 39 
