High-temperature oxidation of Al₂O₃-forming heat-resistant alloys with small amount of sulfur at 1373 and 1473K

Abstract

High-temperature oxidation behavior of Fe-20Cr-4Al alloys with 3, 7, 53, 104, 171, 185, 1300 and 6300ppm of sulfur was studied for 360ks in air at 1373 and 1473K by mass change measurements, observation of surface appearance of the alloys, X-ray diffraction, scanning laser microscopy, scanning electron microscopy and electron probe X-ray microanalysis. Mass changes of the alloys with 7ppm of sulfur at 1373K, with 53 and 1300ppm of sulfur at 1473K showed negative values. This fact was in good agreement with spalling of the oxide on the alloys.