Equilibrium Precipitation of Niobium Carbonitride in Austenite

The equilibrium between niobium carbonitride and austenite has been studied. Experimentally, X-ray diffaction technique was adopted to verify that the precipitates have the same composition and structure. Theoretically, Hillert and Staffansson's regular model about stoichimetric phase was used to describe the thermodynamic properties of multi-component precipitate. Calculated results agree well with experimental values from literatures.