Effect of milling temperatures on the microstructure and high temperature long-term oxidation resistance of oxide-dispersion strengthened steels

摘要

This study investigated the effect of milling temperature on long-term high-temperature (800 degrees C) oxidation property of Fe-14Cr-3W-0.4Ti-0.3Y(2)O(3) (wt.%) oxide dispersion-strengthened steel (milling temperatures were set to 25 degrees C (K1) and -150 degrees C (K4)). Atom-probe tomography results showed several nm-scale naturally formed surface oxide films containing yttrium before oxidation. Weight gains after 6000 h oxidation tests for C (cast alloy without Y2O3), K1 and K4 were measured to be 2.45, 1.46 and 0.30 mg/cm(2), respectively. The exceptional oxidation resistance of K4 was found to come from the complicated interactions among reactive element (RE), grain size, nano-oxide particle and naturally formed oxide-film.