| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Elucidating Microstructural Evolution Under Extreme Environments
|
| Presentation Title |
Prediction of Neutron-Irradiated Cavity Microstructures via Dual-Ion Irradiation up to 184 dpa in T91 Steel |
| Author(s) |
Valentin Pauly, Gary S. Was |
| On-Site Speaker (Planned) |
Valentin Pauly |
| Abstract Scope |
Ferritic-martensitic (FM) steels are candidate materials for internal components in next-generation nuclear reactors where damage levels are expected to reach 200 dpa. Prediction of reactor-irradiated microstructures via dual-ion irradiation coupled with computational rate theory can accelerate the qualification of materials. FM T91 heat 30176 was irradiated in the BOR-60 fast reactor up to 72 dpa at 375 °C and in the Fast Flux Test Facility (FFTF) up to 184 dpa at 415°C. The same heat was subjected to dual-ion irradiation with 9MeV Fe3+ and 3.42MeV He2+ at a damage rate of 7.5 x 10-4 dpa/s with a positive temperature shift and an increased helium injection rate compared to reactor conditions. A rate theory model including helium trapping-detrapping is used to evaluate microstructure evolution and determine the temperature shift and helium injection rate formulae that can predict the cavity microstructures of these two reactors at high damage levels. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Modeling and Simulation, Characterization |