| About this Abstract |
| Meeting |
Materials in Nuclear Energy Systems (MiNES) 2021
|
| Symposium
|
Materials in Nuclear Energy Systems (MiNES) 2021
|
| Presentation Title |
Innovative Elaboration Method of ODS Ferritic Steels Reinforced by Y2Ti2O7 Pyrochlore Phase Oxide |
| Author(s) |
Guillaume Josserand, Laurent Chaffron, Pierre-François Giroux, Joel Ribis, David Simeone, Thierry Gloriant |
| On-Site Speaker (Planned) |
Guillaume Josserand |
| Abstract Scope |
Oxide Dispersion Strengthened (ODS) ferritic steels are promising candidates as cladding material for 4th Generation Sodium-cooled Fast nuclear Reactors. Conventional reinforcement is achieved by introducing titanium and yttrium oxide Y2O3 during ball milling with matrix steel powder. The dissolution of the oxide leads to an uncontrolled nucleation of complex oxides during the consolidation by hot extrusion. While some Y-Ti-O nano-particles are highly beneficial to the mechanical behaviour of the material, coarser ones – e.g. TiC, TiO2, Y2O3 – make it brittle. An innovative alloy-design approach is developed at CEA. Nanostructured Y2Ti2O7 pyrochlore phase oxides are elaborated by mechanochemical synthesis, and then introduced in ferritic matrix through ball milling. This way prevents from the appearance of deleterious coarse particles. Mechanical tests reveal a significant improvement in ductility and a low anisotropy, while maintaining a sufficient tensile strength up to 650°C. An extended cold-formability is expected from this innovative ferritic ODS grade. |
| Proceedings Inclusion? |
Undecided |