LAUSR

Ni-based superalloys represent a class of high performance alloys extensively applied in the aerospace industry, where combination of superior mechanical properties, improved surface stability and high creep and fatigue resistance, are prerequisites. Waspaloy is a wrought, γ ́ strengthened Ni-based superalloy, suitable for fabrication of hot section components in gas turbine and jet engines, mainly as blade and disc material. Hence, efficient commercial application of Waspaloy requires the use of welding, not only during manufacturing of new complex components, but also during repair of service-damaged parts [1]. This paper presents a TEM investigation of the microstructural evolution of Waspaloy, following Gas Tungsten Arc (GTA) and Electron Beam (EB) welding. The nanoscale characterization of γ ́ intermetallic phase provided is of great importance, as its composition, morphology, spatial and size distribution strongly affect the properties, which enable the application of Waspaloy in demanding high-temperature service conditions.