The cyclic-high temperature oxidation behavior of Fe-20Cr-4Al-S (748ppm) alloys with small amounts of yttrium at 1273K

Abstract

The cyclic-high temperature oxidation behavior of Fe-20Cr-4Al-S (748ppmS: A), Fe-20Cr-4Al (702ppmS, 30ppmY: B), Fe-20Cr-4Al (645ppmS, 30ppmY: C) and Fe-20Cr-4Al (73ppmS, 1700ppmY: D) alloys was studied in oxygen at 1273K during 5cycles (1cycle=18.0ks) by mass change measurements, macro-morphology of oxidized surface of the alloy, X-ray diffraction and scanning electron microscopy. Mass changes of all the alloys increased with increasing number of cycles. Cyclic-high temperature oxidation resistance of the C and D alloys increased markedly as compared with the A and B alloys.