About this Abstract |
Meeting |
2023 TMS Annual Meeting & Exhibition
|
Symposium
|
Materials and Chemistry for Molten Salt Systems
|
Presentation Title |
Microstructural Evolution and Hardness Changes in Ion irradiated Ni-based Superalloys |
Author(s) |
Qinyun Chen, Ryan Thier, Yan-Ru Lin, Wang Ling, Steven Zinkle |
On-Site Speaker (Planned) |
Qinyun Chen |
Abstract Scope |
Nickel-based superalloys are promising structural material candidates for molten salt reactors and other advanced nuclear energy systems. However, traditional Ni alloys such as Inconel 718 and Nimonic PE16 exhibit severe mechanical degradation after irradiation. Several high-performance commercial Ni-base superalloys, including Haynes 282 and solid solution strengthened and precipitation strengthened Haynes 244, were irradiated with 8 MeV Ni ions to midrange doses of 1 and 10 dpa at 600 ℃ and 750 ℃. Microstructural changes and mechanical properties were characterized by GIXRD, cross-section TEM, and nanoindentation. With increasing irradiation dose at 600 ℃, the hardness of Haynes 244 with different pre-irradiation heat treatments significantly increased, while the hardness of Haynes 282 showed an overall trend of slight decrease and subsequent increase. Mechanical behavior will be explained based on microstructural changes regarding the size and density of precipitates and dislocations as a function of irradiation temperature, dose, and precipitate type. |
Proceedings Inclusion? |
Planned: |