Abstract
Nanostructured oxide dispersion strengthened (ODS) steels are the leading structural material candidates for advanced nuclear fission and fusion reactor applications due to their excellent radiation tolerances. A 9Cr-ODS ferritic/martensitic steel was produced by gas atomization, short-time mechanical alloying and hot isostatic pressing. The microstructure was characterized by electron backscatter diffraction (EBSD), high-resolution transmission electron microcopy (HRTEM) and atom probe tomography (APT), and the hardness and the tensile properties at room and elevated temperatures were measured. The results showed that the 9Cr-ODS steel are dual-phase ferritic/martensitic structure with extremely high-density of Y-Ti-O-rich nano-clusters. The average size of nano-clusters is less than 5nm and the number density was 3.4×1022/m3. A few larger precipitate CrTi2O5 (~40 nm) and Al2O3 (~100 nm) were found in the microstructure. The 9Cr-ODS steels exhibits the better Vickers hardness and ultimate tensile strengthen compared to Eurofer 97 and ODS Eurofer steels.
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