High-Temperature Cyclic Oxidation of 800H Superalloy at 750°C–950°C in Air

Faculty Engineering Year: 2019
Type of Publication: ZU Hosted Pages:
Authors:
Dalia Saber ahmed Elsayed
Journal: Journal of Testing and Evaluation ASTM international Volume:
Keywords : High-Temperature Cyclic Oxidation of 800H Superalloy , 750°C–950°C    
Abstract:
High-temperature oxidation behavior of iron-based superalloy (800H) was investigated at 750°C, 850°C, and 950°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°C, 850°C, and 950°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.
    
     
 
       

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