High temperature alloy refers to a type of metal material based on iron, nickel, and cobalt that can work for a long time at a high temperature above 600 ℃ and a certain stress; and 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 structure stability and service reliability at various temperatures.
Based on the above-mentioned performance characteristics, and the high degree of alloying of superalloys, it is also called "superalloys". It is an important material widely used in aviation, aerospace, petroleum, chemical industry, and ships. According to the matrix elements, high-temperature alloys are divided into iron-based, nickel-based, cobalt-based and other high-temperature alloys. The service temperature of iron-based superalloys can generally only reach 750~780℃. For heat-resistant parts used at higher temperatures, nickel-based and refractory metal-based alloys are used. Nickel-based superalloy occupies a particularly important position in the entire field of superalloys. It is widely used to manufacture the hottest parts of aviation jet engines and various industrial gas turbines.
Features and application fields of IN718
The unique alloy composition design of IN718 makes it have good comprehensive properties, namely higher strength, creep resistance and fatigue life, good ductility, excellent oxidation resistance, especially under 650℃, its mechanical properties Has good stability. Many parts of modern aero-engines, such as turbine discs, blades, brakes, shafts, stators, seals, supports, pipes, fasteners, etc., are all made of IN718.
At the same time, IN718 is also used in nuclear reactors (heat exchanger pipelines), submarines (propeller blades, quick disconnect devices, auxiliary propulsion motors), chemical industry (containers, pumps, valves, pipelines), power generation (industrial gas turbines), oil and gas industry ( Downhole piping, wellhead hardware, flare arm) and other fields have important applications.
Application of IN718 in the field of additive manufacturing
When traditional manufacturing methods such as machining, forging or welding are used, annealing is often required before the process starts, and the high temperature corrosion and creep resistance of the parts will be affected. The results of additive manufacturing of IN718 alloy show that the mechanical properties have not been sacrificed and can even exceed the performance of cast or forged parts. In addition, IN718 is a typical difficult-to-machine material due to its high cutting temperature and serious work hardening. For the complex geometries usually required in aerospace applications, the manufacture of IN718 parts is often very difficult and costly.
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