Abstract:Ni-Fe based superalloys are expected to be employed as 700℃ ultra-supercritical coal fired power plants because of its excellent high temperature strength, oxidation and corrosion resistance, low cost and high workability. In this paper, thermodynamic calculation software JMatPro and Ni-based database were used to analyze the solidification and equilibrium phase precipitation of a new Ni-Fe based superalloy. The effect of Al, Ti, Cr and C additions on the precipitation behaviors of strengthing phases was calculated. The results showed that the main constitution phases were γ、γ′、MC and M23C6. The precipitated temperature and amount of γ′ increased with the increasing Ti and Al contents. With the increase of Cr content, the solidus and liquidus temperature decreased and the amount of M23C6 increased firstly and then decreased. The additions of C content could reduce the freezing range and promote the amount and precipitated temperature of MC and M23C6. These results are beneficial to the superalloys design and development.