Heat-treated nickel-based superalloy object and process for producing it

摘要

The invention relates to nickel-based superalloy single-crystal objects which are produced from a special alloy and heat-treated. The resulting objects are substantially free of grain boundary hardeners such as carbon, boron and zirconium, and contain only a limited amount of cobalt. Owing to the alloy composition, the alloys have a high initial melting point. The heat treatment process homogenises the microstructure and refines the gamma '-morphology. The invention is particularly useful, for example, in the production of rotor blades and guide vanes for gas turbine engines.