| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advancing Current and State-of-the-Art Application of Ni- and Co-based Superalloys
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| Presentation Title |
Microstructure Evolution in a P/M Ni-based Super Alloy |
| Author(s) |
Taisuke Sasaki, Akihiro Suzuki, Motoki Okuno, Daisuke Nagahama, Masato Ohnuma, Kazuhiro Hono |
| On-Site Speaker (Planned) |
Taisuke Sasaki |
| Abstract Scope |
P/M Ni-based superalloys for turbine disk are subjected to a post-forging heat treatment to precipitate γ’ phase. Because stability of the γ’ phase depends on the heat treatment temperature, the γ’ phase in the P/M Ni-based superalloys exhibit a complicated growth behavior. In this work, we analyzed the mechanism of this anomalous microstructure evolution by SEM, TEM and 3DAP and SAXS.
In the early stage of the heat treatment, tertiary γ’ phase with a few nm in diameter precipitates, and are coarsened monotonically while it is not the case for secondary γ’ phase with ~20 nm in diameter. The size of the secondary γ’ does not change significantly in the early stage, and is mostly identical to that of the tertiary γ’ phase at 200 h. The reason for the different growth behavior can be explained by the compositional change within the precipitates during the heat treatment. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |