| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Steels in Extreme Environments
|
| Presentation Title |
Neutron Irradiation-Induced Performance Degradation of RAFM and ODS Steels |
| Author(s) |
Arunodaya Bhattacharya |
| On-Site Speaker (Planned) |
Arunodaya Bhattacharya |
| Abstract Scope |
Reduced activation ferritic-martensitic (RAFM) and oxide dispersion strengthened (ODS) steels are leading candidates for fusion first-wall/blanket structures. However, the narrow operating temperature window of ~350-550 °C with RAFM steels is a major reactor design challenge. The lower temperature limit is particularly concerning as a design limiting issue due to irradiation-induced low temperature hardening-embrittlement (LTHE) phenomenon. Uncertainty still remains regarding the underlying mechanisms causing LTHE and the synergistic effect of helium. Using neutron irradiations in high flux isotope reactor (HFIR) and isotopic tailoring this presentation will discuss the LTHE scenarios in RAFM steels for doses >80 dpa. The presentation will also discuss the results on ODS steels neutron irradiated between 300-500 °C/4.5–50.7 dpa – which show significant high temperature hardening. The LTHE scenarios for ODS steels vs RAFM steels are compared to highlighted the necessity of a different safe lower operating temperature limit for ODS alloys for fusion applications. |
| Proceedings Inclusion? |
Planned: |