Effect of the microstructure of Haynes 282 nickel-based superalloys on oxidation behavior under oxy-fuel combustion conditions

Abstract

The effect of the Haynes 282 microstructure on its oxidation behavior was investigated using X-ray diffraction, scanning electron microscopy, electron backscatter diffraction, transmission Kikuchi diffraction, and transmission electron microscopy. Specimens with different grain sizes were oxidized at 760 °C in O2 + 100 ppm SO2 to simulate oxy-fuel combustion conditions. Small-grained, deformed specimens showed a high oxidation rate at the initial stage. However, the small-grained specimen exhibited superior oxidation resistance at the later stage of oxidation, with Cr depletion being suppressed only in this specimen. These different oxidation behaviors are discussed in terms of Cr and Ti supplied from the matrix. ？ 2022 The Authors