HEAT TREATED SUPERALLOY SINGLE CRYSTAL ARTICLE AND PROCESS

摘要

Nickel base superalloy single crystal articles formed from a particular alloy and heat treated are described as is the process employed. The resultant articles are substantially free from the grain boundary strengtheners such as carbon, boron, and zirconium and contain only a limited amount of cobalt. As a result of the alloy composition, the alloys have a high incipient melting temperature. The heat treatment process homogenizes the microstructure, and refines the gamma prime morphology. The alloy has particular utility in the fabrication of airfoils (blades and vanes) for use in gas turbine engines. In particular, the strength of articles made according to this invention makes them especially suited for use as blades in gas turbine engines.