About this Abstract |
| Meeting |
2021 TMS Annual Meeting & Exhibition
|
| Symposium
|
Phase Transformations and Microstructural Evolution
|
| Presentation Title |
Phase Instability and Formation of Radiation-induced BCC-phases in Austenitic Stainless Steel after Long Term Neutron Exposure |
| Author(s) |
Diana A. Merezhko, Mikhail Merezhko, Maxim Gussev, Thomas Rosseel, Oleg Maksimkin, Francis Garner |
| On-Site Speaker (Planned) |
Mikhail Merezhko |
| Abstract Scope |
Accumulation of radiation-induced ferrite is a well-known phenomenon; however, it was not recognized as a potential issue until recently. BCC-phases, which may consist of Cr-rich ferrite or Fe-rich ferrite or both, being brittle after irradiation, may affect corrosion behavior in water coolant. This work analyzes available experimental datasets showing the accumulation of a significant amount of ferritic phase (3-4vol.% and more) after high-dose neutron irradiation. The data are derived from the BN-350 and BOR-60 SFR and also include several ion-irradiation experiments. The research considers Western (304 and 316) and Russian (12Cr18Ni10Ti, an analog of 321) austenitic steels (AustSS) irradiated to 0.3–125 dpa at temperatures of 280-420°C and dose rates of 0.25-60.2dpa/year. Experimental observations suggest that radiation-induced ferrite in AustSS forms a specific layered structure along grain boundaries, leading to reduced fracture toughness. Precipitates located near the grain boundaries may be also prone to corrosive attack in the high-temperature water. |
| Proceedings Inclusion? |
Planned: |