The Effect of Carbide Morphologies on Elevated Temperature Tensile and Fatigue Behavior of a Modified Single Crystal Ni-Base Superalloy

Abstract

Minor additions of various grain boundary strengthening elements to single crystal Ni-base superalloys have been shown to improve castability, but their effects on mechanical properties are not well understood. A comparative investigation of baseline CMSX-4 and variations modified with carbon, carbon and boron, and carbon and nitrogen has been performed. These modifications have been shown to form interdendritic MC-type carbides with different morphologies.