Abstract
Oxide Dispersion Strengthened (ODS) steels are promising candidate alloys for structural and cladding applications in extreme environments. They contain a high density of nanoscale oxides for high temperature mechanical strength and radiation resistance. In this work, gas atomization reaction synthesis (GARS) was used to produce powders that were used for additive manufacturing (AM) Laser Powder Bed Fusion consolidation of ODS steels, in order to skip the traditional mechanical alloying of blended yttria and alloy powders. Powder containing iron, chromium, and tungsten with varying amounts of yttrium, titanium, oxygen and zirconium were used to produce ODS steel samples. AM consolidated specimens and powder samples were characterized with transmission electron microscopy. TEM imaging, diffraction patterns, and energy dispersive X-ray spectroscopy (EDS) was used to identify phases present before and after consolidation across chemistries. The effect of the controlled oxygen input (from GARS) and the oxide-forming additions (Y, Ti, Zr) on precipitate size distribution and composition is substantiated and discussed.
| Original language | English |
|---|---|
| Article number | 115141 |
| Journal | Materials Characterization |
| Volume | 225 |
| DOIs | |
| State | Published - Jul 2025 |
Funding
This material is based partly upon work supported by the Department of Energy National Nuclear Security Administration through the Nuclear Science and Security Consortium under Award Number(s) DE-NA0003996 and partly under the DOE ARPA-E GAMOW (Galvanizing Advances in Market-Aligned Fusion for an Overabundance of Watts) program, DE-AR0001379. Portions of this work were performed at the Analytical Instrumentation Facility (AIF) at North Carolina State University , which is supported by the State of North Carolina and the National Science Foundation (award number ECCS-2025064 ). The AIF is a member of the North Carolina Research Triangle Nanotechnology Network (RTNN) , a site in the National Nanotechnology Coordinated Infrastructure (NNCI) . The authors would like to thank the Low Activation Materials Development and Analysis Facility at Oak Ridge National Lab for their support in TEM characterization of samples. The authors would like to thank Dr. Chris Winkler who has been extremely helpful with providing support during TEM characterization at NC State.