Abstract
The characteristics of strengthening nanoparticles have a major influence on the mechanical property and irradiation resistance of oxide dispersion strengthened (ODS) steels. In situ small angle neutron scattering (SANS) experiments were performed to determine the evolution of nanoparticles in 9Cr ODS steel powders varied with temperature. Initial-added Y2O3 was completely dissolved into the steel matrix after mechanical alloying. Nanoparticles emerge after annealing at 600°C for 10min and coarsen slightly after 12h. The radius of nanoparticles increases from 0.73nm at 600°C to 1.63nm at 1000°C, while the volume fraction decreases with increasing annealing temperature.
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