NSUF 16-790: Microstructural evolution of dual-phase cast stainless steels under irradiation
The embrittlement of cast austenitic stainless steels and stainless steel welds is a critical issue for aging nuclear power plants. Irradiation-induced defect and precipitate microstructures are responsible for the deteriorated mechanical performance after long-term service exposure to reactor environments. Previous studies have showed that irradiation dose rates and pre-existing precipitates induced by thermal aging can affect the microstructural evolution. The proposed study is to investigate the effects of dose rate and pre-existing neutron-irradiated microstructure on the phase stability and defect evolution of duplex microstructures under irradiation. The material to be investigated is a CF-8 alloy with approximately 20% ferrite. The focus of the study is the kinetics of defect evolution with and without the pre-neutron-irradiated microstructure, and the evolution of G-phase precipitation and spinodal decomposition of delta ferrite. The results will be used along with mechanical tests to improve our understanding on the embrittlement mechanism of CASS and SS welds under service conditions.
Допълнителна информация
| Поле | Стойност |
|---|---|
| Awarded Institution | Argonne National Laboratory |
| Embargo End Date | 2026-02-27 |
| Facility Tech Lead | Alina Montrose, Mukesh Bachhav, Wei-Ying Chen |
| NSUF Call | FY 2017 RTE 1st Call |
| PI | Yiren Chen |
| Project Member | Yiren Chen - Argonne National Laboratory (https://orcid.org/0000-0002-4153-1532) |
| Project Notes | Awarded on 12/16/2016 |
| Project Type | RTE |
| Publication | Microstructural evolution of NF709 austenitic stainless steel under in-situ ion irradiations at room temperature, 300, 400, 500 and 600 °C Chi Xu, Wei-Ying Chen, Yiren Chen, Yong Yang Journal of Nuclear Materials 509 2018-10-01 https://www.sciencedirect.com/science/article/pii/S002231151830165X#ack0010 |
| RTE Number | 790 |