Abstract
Oxidation of Fe-20Cr-4Al alloys with small amounts of sulfur and reactive elements was studied for 360ks in air at 1573K. Mass changes of the alloys with up to 185ppm of sulfur were 2.7-3.4×10-2kg/m2. Mass changes of the alloys with 1300 and 6300ppm of sulfur showed small values compared with the other alloys with sulfur. This result was in good agreement with spalling of oxide films on 1300 and 6300ppmS alloys. Mass changes of the alloys with sulfur and yttrium were 2.3-3.0×10-2kg/m2. On the other hand, mass changes of the alloys with sulfur and hafnium showed almost negative values because of marked spalling of oxide films on these alloys.
