| About this Abstract |
| Meeting |
Materials in Nuclear Energy Systems (MiNES) 2021
|
| Symposium
|
Materials in Nuclear Energy Systems (MiNES) 2021
|
| Presentation Title |
Effect of Helium Injection Rate on Cavity Microstructure in Dual Ion Irradiated T91 Steel |
| Author(s) |
Valentin Pauly, Stephen Taller, Zhijie Jiao, Gary S. Was |
| On-Site Speaker (Planned) |
Valentin Pauly |
| Abstract Scope |
Ferritic-martensitic steel T91 heat 30176 was irradiated using defocused 5.0 MeV Fe2+ or 9.0 MeV Fe3+ ions up to 100 dpa at 445-460°C with a constant damage rate of 7×10-4 dpa/s with co-injected He2+ ions at a rate varying between 0.22 and 4 appmHe/dpa. Transmission electron microscopy was used to characterize irradiation-induced cavities. For the first 35 dpa, the He injection rate was kept constant at 4 appmHe/dpa. After 35 dpa, the He injection rate was either kept constant or reduced to 0.22 appmHe/dpa. The cavity microstructure at 72 dpa with a reduction in He injection rate was similar to the constant 4 appmHe/dpa. Characterization results were combined with a model based on the cavity growth rate equation and the critical bubble model to better understand the impact of varying He injection rate on the nucleation of bubbles and their transformation to voids. |
| Proceedings Inclusion? |
Undecided |