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논문 기본 정보

자료유형
학술저널
저자정보
Yushuo Li (Northeastern University) Yanwu Dong (Northeastern University) Zhouhua Jiang (Northeastern University) Shuyang Du (Northeastern University) Kean Yao (Northeastern University) Yong Wang (Northeastern University) Xinwei Wang (Northeastern University)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.30 No.5
발행연도
2024.5
수록면
1,356 - 1,369 (14page)
DOI
10.1007/s12540-023-01570-z

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초록· 키워드

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To optimize the hot deformation microstructure of the difficult-to-deform GH4975 superalloy, this study investigates theeffect of cooling rate after sup-solvus temperature holding on the initial microstructure before hot deformation, and the effectof initial microstructure difference on the hot deformation microstructure. The results indicate that with decreasing the coolingrate from 1 to 0.1 °C min−1, the γ′ precipitates evolve into big size and irregular shape gradually, and the ratio of volumefraction to size of γ′ precipitates decreases. These changes intensify the bulging of grain boundaries (GBs) and enhancethe migration of dislocations and GBs in γ matrix. Therefore, the nucleation and development of dynamic recrystallization(DRX) grains in γ matrix during deformation are promoted, but the refinement effect of DRX grains in γ matrix is weakened. Noteworthily, there is a transition point when the cooling rate is extremely slow so that the fully grown γ′ precipitates cancontact each other and separate or seal off the local γ matrix. The DRX grains in γ matrix cannot penetrate the envelope ofγ′ precipitates and undergo significant refinement. Moreover, these large and irregular γ′ precipitates are fragmented intochains during deformation, undergo DRX, and eventually become refined. This is to say, sup-solvus temperature holding(1220 °C for 10 h) followed by extremely slow cooling (0.1 °C min−1) can not only ensure high DRX fraction, but also ensurefine grains of deformed microstructure, which is a recommended pretreatment process.

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