Superalloy refers to a class of metal materials based on iron, nickel and cobalt, which can work for a long time at high temperature above 600℃ and under certain stress. And has a high temperature strength, good oxidation resistance and corrosion resistance, good fatigue performance, fracture toughness and other comprehensive properties. The superalloy is a single austenitic structure, which has good stability and reliability at various temperatures.
Based on the above performance characteristics, and the high alloying degree of superalloy, also known as "super alloy", is widely used in aviation, aerospace, petroleum, chemical industry, ships an important material. According to the matrix elements, superalloys are divided into iron, nickel, cobalt and other superalloys. The use temperature of iron-based superalloys can generally only reach 750~780 ° C, and for heat-resistant parts used at higher temperatures, nickel-based and refractory metal-based alloys are used. Nickel-based superalloy occupies a special important position in the whole field of superalloy, and it is widely used to manufacture the hottest end parts of aviation jet engines and various industrial gas turbines.