2022 Fiscal Year Annual Research Report
Novel strengthening mechanisms of high-strength Ni-Fe-based superalloys
| Project/Area Number |
20K15057
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| Research Institution | Nagoya University |
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Principal Investigator |
孫 飛 名古屋大学, 工学研究科, 特任講師 (00836562)
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| Project Period (FY) |
2020-04-01 – 2023-03-31
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| Keywords | Ni-Fe-based superalloy / L12 ordered precipitate / Orowan mechanism / Dislocation |
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| Outline of Annual Research Achievements |
According to the previous results, Ni-Fe-based superalloys have been optimized by coordinating elemental compositions and heat treatment conditions. Tensile tests results show that the Ni-Fe-based alloy has excellent yield strength at 700°C, which is higher than other Ni-based/Ni-Fe-based alloys. Tensile properties are sensitively affected by the size of γ′precipitates and γ′size exists a critical size. Higher Fe content addition can decrease the γ-γ′lattice mismatch and increase the coarsening rate of γ′ precipitate due to the decrease of the activation energy of v coarsening. The deformed microstructures have been characterized and analyzed to clarify the deformation behavior and related microstructure evolution in terms of dislocation interactions with γ′ precipitates.
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