Effect of overload on the oxidation behavior of CF8A austenitic stainless steel in a high-temperature water environment

The oxidation behavior of CF8A austenitic stainless steel was investigated under constant load and overload tests in a high-temperature water environment. Compared with the constant load condition, the protective performance of the oxide film formed on the matrix under the overload condition was seriously degraded. The main manifestation is the transformation of the inner oxide from Cr2O3 to non-stoichiometric spinel (Ni,Fe)(Fe,Cr)(2)O-4 under the overload condition. This is due to an increase in the chemical potential of the matrix and a change in the orientation between the oxide films and the matrix after overloading.