| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Radiation Effects in Metals and Ceramics
|
| Presentation Title |
Enhanced Austenite Stability in Nanostructured Steels During Ion Irradiation |
| Author(s) |
Andrew K. Hoffman, Maalavan Arivu, Haiming Wen |
| On-Site Speaker (Planned) |
Andrew K. Hoffman |
| Abstract Scope |
The formation of ferrite in austenitic steels during irradiation has been documented for decades, and typically occurs at temperatures above 400 °C. Because this transformation does not typically occur at lower temperatures, this transformation has been attributed greatly to the chemical segregation of Ni (an austenite stabilizer) towards grain boundaries and dislocations, therefore reducing the austenite stability of the matrix. Some studies, however, claim that this transformation is due to the high strain accumulated in the material, causing a strain induced martensite transformation. In this study, we show that in the case of 304L steel ion irradiated at 500 °C, both chemical segregation and strain contribute to the ferrite formation. Additionally, we show that ultrafine-grained and nanocrystalline 304L steels possess significant resistance to the ferritic transformation during irradiation. This enhanced phase stability has been attributed to both reduced radiation induced segregation and resistance to radiation induced strain from defect accumulation. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |