About this Abstract |
| Meeting |
Materials in Nuclear Energy Systems (MiNES) 2025
|
| Symposium
|
Materials in Nuclear Energy Systems (MiNES) 2025
|
| Presentation Title |
Development of an ODS FeCrAl Alloy With Optimized High Temperature Properties and Irradiation Resistance |
| Author(s) |
David T. Hoelzer, Amy Godfrey, James Burns, Sebastien Dryepondt, Caleb Massey |
| On-Site Speaker (Planned) |
David T. Hoelzer |
| Abstract Scope |
Advanced oxide dispersion strengthened (ODS) ferritic alloys, such as 14YWT, were developed for fuel cladding and core structural materials in several nuclear energy reactor systems due to their improved high temperature strength and creep properties and excellent resistance to radiation damage. To achieve these attributes, 14YWT contains a high concentration of nano-sized Ti-Y-oxides or nanoclusters and ultra-fine grains that make it an ideal choice for high temperature, creep resistant applications in sodium-cooled fast reactors. However, the 14% Cr content of 14YWT is inadequate for corrosion resistance in other reactors, such as lead-cooled fast reactors. For these reactors, Al and Cr additions are required for high-temperature corrosion resistance. This new project will apply the extensive knowledge gained from past R&D of 14YWT and ODS FeCrAl alloys for developing a new ODS FeCrAl with a balance of irradiation and creep resistance at high temperatures and corrosion resistance for thin wall fuel cladding in Pb-containing reactors and heat pipes in Na-containing micro-reactor concepts. Two ODS FeCrAl alloys were produced by mechanical alloying with base powder composition Fe-16Cr-4Al-2Mo-0.2Y (wt.%) and combinations of CeO2 and Y2O3 powders. The microstructure characterization results of both alloys revealed grain sizes of ~450-520 nm with weak texture components and a high number density of nano-sized Ce-Y-O particles that contained no Al. The tensile tests for both alloys from room temperature to 400ºC showed very high strengths, but very low ductilities. From 500ºC to 800ºC, the strengths decrease rapidly, and the ductilities increase significantly. |
| Proceedings Inclusion? |
Undecided |