Modeling of the partitioning and phase transformation temperatures of an as-cast third generation single crystal Ni-base superalloy

Cast single crystal Ni-base superalloys exhibit severe solidification segregation that must be subsequently removed by solution heat treatment. In order to understand how some of the elements in these alloys effect the solidification partitioning, the as-cast microstructure of the third generation single crystal Ni-base superalloy, CMSX-10, was examined. In addition, the solidification partitioning was calculated using Thermo-Calc™. The solidus, liquidus and γ′-solvus were also calculated for the compositions of the base alloy, and determined compositions of the dendrite cores and the interdendritic regions. All of the calculated values were compared to the experimentally determined results of this study and areas for future work will be discussed.