Abstract
The oxidation behavior of 9Cr-ODS and MA956 oxide dispersion strengthened (ODS) steel exposed to supercritical water at 500–600 °C and 25 MPa were examined. For comparison, a non-ODS steel (9Cr) was also examined. The oxidized samples were characterized by scanning electron microscopy/energy and gravimetry. The oxide films were rather porous in 9Cr steel, while the porosity in 9Cr-ODS almost could not be observed. A three-layered oxide films formed on 9Cr-ODS steel, which was composed of an outer oxide layer, an inner oxide layer, and an internal oxide zone which was featured by gradual variation of alloying elements and oxygen from the oxide to the matrix, the Cr2O3 in internal oxide zone play a key role of oxidation behavior. The kinetic data of 9Cr and 9Cr-ODS steels showed that oxide films formation obeyed a parabolic rate law. The oxidation rate of MA956 was lowest, the 9Cr-ODS steel lower than 9Cr.
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