| About this Abstract |
| Meeting |
2024 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Stability in Extreme Environments II
|
| Presentation Title |
Effect of Damage, Temperature, and Helium on Irradiated Nanoprecipitation in Advanced Ferritic/Martensitic (F/M) Fe9Cr Steel |
| Author(s) |
T.M. Kelsy Green, Kevin Field, Ying Yang, Tim Graening, Weicheng Zhong, Lizhen Tan |
| On-Site Speaker (Planned) |
T.M. Kelsy Green |
| Abstract Scope |
Nanoprecipitation is an important microstructural feature to prevent helium-driven materials degradation in steels for nuclear fission and fusion reactors. In this work, the behavior of TiC-MX nanoprecipitates in a novel Fe-9 wt% Cr reduced-activation FM (RAFM) steel alloy were systematically studied under various ion damage conditions with parameters ranging from 300-600°C, 1×10-4 - 7×10-4 dpa/s, 1-100 dpa, and 0-25 appm He/dpa. Results showed that helium affected the evolution of precipitates via the suppression of irradiation-enhanced Ostwald ripening but did not affect the overall high-dose (>15 dpa) dissolution behavior. The TiC precipitates sequestered helium in the form of nanobubbles at their interfaces near the peak swelling temperature. The importance of this phenomena to elongating the incubation period of swelling in RAFM steels, the applicability of previous theories on precipitate stability under irradiation, and the growth of cavities at the precipitate-matrix interface will be discussed. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Characterization, Iron and Steel |