| About this Abstract |
| Meeting |
2020 TMS Annual Meeting & Exhibition
|
| Symposium
|
Radiation Effects in Metals and Ceramics
|
| Presentation Title |
Alpha-alpha' Decomposition at Grain Boundaries in Annealed and Irradiated ODS Steels |
| Author(s) |
Joel Ribis, Amal Issaoui, Joel Malaplate, Marie Loyer-Prost, Alexandre Legris |
| On-Site Speaker (Planned) |
Joel Ribis |
| Abstract Scope |
Cr-rich ferritic Oxide Dispersion Strengthened (ODS) steels are envisaged as cladding materials in Generation IV fission nuclear reactors due to their good radiation resistance and improved high-temperature mechanical properties. However, these alloys, whose service temperature is in the range of 400-700°C, face severe embrittlement problems owing to the decomposition of the matrix into the alpha (Fe-rich) and alpha’ (Cr-rich) phases. Thus, the aim of our study is to analyse the chemical response of the grain boundaries under both sollicitation: thermal aging and irradiation. We showed that under thermal aging, the low angle grain boundaries present a slight segregation of Cr while the large angle grain boundaries present a high Cr segregation. Further we reported spinodal decomposition solely at high angle grain boundaries while a classic nucleation/growth is observed for the alpha-alpha’ decomposition within the matrix. Under irradiation, Cr segregation is observed at dislocations while grain boundaries are systematically depleted. |
| Proceedings Inclusion? |
Planned: Supplemental Proceedings volume |