Thermodynamic calculation of equilibrium phases for P/M superalloys

The precipitation temperature range and quantity in equilibrium phases of three P/M superalloys, René95, René88DT and зп741нп, were systematically calculated by using a thermodynamic calculation method and the relevant superalloy database. The calculated results show that the three alloys have the same major phases, such as γ,γ' and MC, M6C, M23C6 carbides. The quantity of carbides in René95 is more than the others. The γ' precipitation temperature of зп741нп is higher and the γ' amount is more than that of René95 or René88DT. The liquid segregation behaviors of the three alloys were compared and discussed.