Influence of Fe Ion Irradiation at 500°C on the Nanostructure of Oxide Dispersion-strengthened Steels

The radiation stability of three ODS steels, Eurofer ODS, 10Cr ODS and KP-3 ODS with different alloying systems was investigated in the present work. Radiation-induced changes in the ODS steels under iron ion irradiation up to a dose of 100 dpa at 500° C were analyzed with transmission electron microscopy. Although the size of oxide inclusions remained virtually unchanged under irradiation, a strong decrease in their number density was observed in 10Cr ODS and KP-3 ODS steels, whereas in Eurofer ODS the density of oxides did not change. Y–Ti–O and Y–Al–O oxides in 10Cr ODS and KP-3 ODS steels showed lower radiation stability compared to Y–O oxides in Eurofer ODS steel.