| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability in Extreme Environments II
|
| Presentation Title |
Precipitate Evolution and Stability in Superalloy 718 Following HFIR Irradiation or Thermal Aging |
| Author(s) |
Stephen Taller, Jesse Werden |
| On-Site Speaker (Planned) |
Stephen Taller |
| Abstract Scope |
Ni-based superalloys gained their status as a candidate alloy class for high temperature applications because of their high strength and their innate creep resistance stemming from the precipitating γ’/γ'' phases. These phases are considered metastable and may not survive the combination of high temperatures and radiation damage in nuclear environments. Samples from three heat treatments of superalloy 718, two with distinct mixtures of γ' and γ'' precipitates, and one initially homogenized, were prepared. Samples were either irradiated in the High Flux Isotope Reactor (HFIR) up to 10 DPA at nominal temperatures of either 300°C or 600°C or aged at the same temperatures for the same duration as the HFIR irradiations to capture thermal precipitate evolution. Tensile testing was performed on irradiated and unirradiated material at 25, 300, and 600 °C with corresponding transmission electron microscopy, finding that the metastable γ'' precipitates determine high temperature strength after irradiation. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Environmental Effects, High-Temperature Materials, Copper / Nickel / Cobalt |