Carbon Additions and Grain Defect Formation in High Refractory Nickel-Base Single Crystal Superalloys

Abstract

Using two half fractional factorial experimental designs, the effect of alloying additions on the solidification characteristics of single crystal Ni-base superalloys has been studied in twelve distinct "2nd generation" type alloys. The experimental alloys, with compositional variations of C, W, Re, Ta, Al and Hf, were solidified as cylindrical bars in a large cluster mold.