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자료유형
학술저널
저자정보
Sigeng Zhou (Chinese Academy of Sciences) Naicheng Sheng (Chinese Academy of Sciences) Shijie Sun (Chinese Academy of Sciences) Shigang Fan (Chinese Academy of Sciences) Jinjiang Yu (Chinese Academy of Sciences) Guichen Hou (Chinese Academy of Sciences) Jinguo Li (Chinese Academy of Sciences) Yizhou Zhou (Chinese Academy of Sciences) Xiaofeng Sun (Chinese Academy of Sciences)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.29 No.1
발행연도
2023.1
수록면
27 - 37 (11page)
DOI
10.1007/s12540-022-01216-6

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The evolution of γ′ phase and γ/γ′ eutectic during short-time heat treatment of the Ni-based superalloy with high W content,K416B are investigated. In this study, high temperature Differential Scanning Calorimetry (DSC) is employed to designthe heat treatment experiments and the precipitate temperature of secondary γ′ is found in the cooling curve. The standardcoarsening model is applied to figure out the coarsening rate constant of γ′ precipitate. On this basis, a novel method isproposed to predict the globularization time of γ phase in γ/γ′ eutectic during the heat treatment process. As holding temperatureincreases, more γ lamellae convert to platelets before reaching thermodynamic equilibrium. Electron microscopyobservations exhibit the boundary splitting and necking formation on the γ plate surface. Moreover, the dissolution kineticsof γ phase is quantitatively assessed by JMAK model. The volume fraction descends rapidly in the initial stage, and thenreach to a threshold. Above proposed approaches are validated via various heat treatment experiments.

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