Waspaloy (also known as Alloy 685) is a nickel base, age hardenable superalloy with excellent high-temperature strength and good corrosion resistance by combustion products, notably to oxidation, at service temperatures of up to 1200°F (650°C) for critical rotating applications, and up to 1600°F (870°C) for less demanding applications. At temperatures over 1600°F (870°C), intergranular oxidation can occur.
The corrosion resistance is very good even after numerous cycles of elevated temperature exposure, or constant exposure to temperatures of up to 1900°F (1038°C). For the best possible corrosion resistance, solution-treated material is recommended. Waspaloy is also known to behave well in atmospheres in gas turbine engine service and salt spray environments.
Due to these properties, Nickel Waspaloy finds use in gas turbine engine components and aircraft jet engines, such as compressor disks, rotor disks, shafts, spacers, seals, rings, and casings. It also finds use in fasteners and other engine hardware in airframe assemblies and missile systems. Waspaloy is produced by vacuum induction melting and vacuum arc refining (VIM/VAR), or by vacuum induction melting and electroslag refining (VIM/ESR).
