Effect of Al content on the oxidation behavior of Y2Ti2O7-dispersed Fe-14Cr ferritic alloys

Aluminum was added at different percentages of 1.5, 3 and 4.5 wt.% into the Y2Ti2O7-dispersed Fe-14Cr ferritic alloy to improve its oxidation resistance. The oxidation behavior of the oxide dispersion strengthened (ODS) alloys was investigated at 1100 °C in air up to 200 h. Al plays the key role in improving the oxidation resistance of the ODS alloys by generating alumina protection scale. Y2Ti2O7 is of importance to form stable alumina layer. To produce a compact and continuous alumina layer on the surface of Fe-14Cr ODS alloys, the concentration of Al should not be less than 4.5 wt.%.