Superalloy is a kind of metal material based on iron, nickel and cobalt, which can work for a long time under high temperature above 600 ℃ and certain stress; It has high high temperature strength, good oxidation and corrosion resistance, good fatigue performance, fracture toughness and other comprehensive properties. The superalloy is a single austenitic structure, which has good structural stability and service reliability at various temperatures.
Based on the above performance characteristics and high alloying degree of superalloy, it is also called "high temperature alloy", and is an important material widely used in aviation, aerospace, petroleum, chemical industry and ships. According to the matrix elements, the superalloys are divided into iron base, nickel base, cobalt base and other superalloys. The service temperature of iron base superalloy can only reach 750~780 ℃. For heat-resistant parts used at higher temperatures, nickel base and refractory metal based alloys are used. Nickel base superalloys play a particularly important role in the field of superalloys. They are widely used to manufacture the hottest end components of aviation jet engines and various industrial gas turbines.
