Research progress in inertia friction welding of nickel-based superalloys

Nickel-based superalloys are widely used in high-temperature turbine components of aviation engines， and inertia friction welding （IFW） is widely used for the connection of nickel-based superalloy disc and shaft due to its solid-phase bonding property and high weld quality. With the emergence of new materials and structures， there are greater challenges for inertia friction welding. Therefore， this paper mainly reviews the current research status of the formation mechanism of weld seam， microstructural evolution characteristics， mechanical properties， and numerical simulation of welding process in inertia friction welding joint of nickel-based superalloy. At the same time， the formation mechanism of continuous drive friction welding joint of nickel-based superalloy is summarized for comparison. Finally， the key issues such as how to smoothly extrude flash， the selection of heat treatment process and the deterioration of corrosion resistance of joints after heat treatment are put forward in the relevant research in the future.