Hot Deformation Behavior of Nickel-Based Superalloy GH4720Li |
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Authors: | QU Jing-long BI Zhong-nan DU Jin-hui WANG Min-qing WANG Qing-zeng ZHANG Ji |
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Affiliation: | 1. Central Iron and Steel Research Institute, Beijing 100081, Chinas 2. Special Steel Multi-Division, Baoshan Iron and Steel Co Ltd, Shanghai 200940, China |
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Abstract: | The hot deformation characteristics of GH4720Li alloy were studied at the temperature of 1100-1170 ℃ and strain rate of 001-1 s-1 using Gleeble hot compression tests. True stress-true strain curves and deformation microstructures were investigated. Constitutive equation was established using the hyperbolic law. Processing map for hot working was also developed on the basis of the variations of efficiency of power dissipation with temperature and strain rate. The results show that dynamic recrystallization is the dominant softening mechanism during hot deformation. Fully recrystallized grain is obtained at strain of 07 above 1130 ℃, and coarsening occurs above 1150 ℃. The mean deformation activation energy is determined to be 512 kJ/mol. According to the low activation energy value, high dissipation efficiency parameter and fine recrystallized microstructure, 1130 ℃ is chosen as the hot working temperature for GH4720Li alloy. |
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