This work reports the melting of boride precipitates along the grain boundary of a supposedly solid state welding of a polycrystalline superalloy, and discusses its attendant effect on the hot ductility behaviour of the alloy. Nickel-based superalloy used for this study was previously processed by hot extrusion of argon atomized powered followed by forging. The alloy was solution heat treated at 1120°C, aged at 760°C and subsequently air cooled to room temperature. | On the role of boride in the structural integrity of a turbine disc superalloy’s solid state weld
