Abstract
High-temperature oxidation behavior of iron-based superalloy (800H) was investigated at 750 degrees C, 850 degrees C, and 950 degrees C in air for 96 h. Weight gain was used to determine the kinetics of oxidation. The surface of the alloy was characterized by using scanning electron microscopy, X-ray diffraction, and energy dispersive X-ray spectroscopy after oxidation process. The results showed that mass gain increased rapidly in the initial stage of oxidation at high temperature. The alloy obeyed parabolic behavior at 750 degrees C, 850 degrees C, and 950 degrees C. The oxide layer mainly contains oxides of chromium oxide, nickel oxide, iron oxide, and spinel chromium nickel oxide. The thickness of the oxide scales increased with time and temperature.