Abstract
The ODS ferritic/martensitic (ODS-FM) steel was irradiated up to 500 dpa at 550 °C with 2.5 MeV Fe2+ ions to investigate the microstructure evolution under low to very high doses. Transmission Electron Microscopy (TEM) and Energy-Dispersive X-ray Spectroscopy (EDS) were conducted to characterize the microstructure and chemical composition. Only a few a0 〈100〉 dislocation loops were observed at low doses, which evolved into dislocation networks with increasing dose. Voids preferentially formed at the oxides/matrix interface, and some voids gradually accumulated on grain boundaries and dislocation lines as the dose increased. The oxide particles underwent dissolution, re-precipitation, and coarsening, resulting in the formation of high-density nano-oxide particles that greatly inhibit void swelling. Ti-rich and (Y, O)-rich shells of Y-Ti-O particles were successively formed during the dissolution process.
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