IN718: The most widely used high-temperature alloy material in additive manufacturing
High-temperature alloy refers to a type of metal material based on iron, nickel, and cobalt that can work at high temperatures above 600°C and under certain stress for a long time; and has high high-temperature strength, good anti-oxidation and anti-corrosion properties, Good fatigue performance, fracture toughness and other comprehensive properties. High-temperature alloys have a single austenite structure and have good structural stability and service reliability at various temperatures.
Based on the above performance characteristics and the high degree of alloying of high-temperature alloys, they are also called "superalloys" and are 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 high-temperature alloys can generally only reach 750~780°C. For heat-resistant parts used at higher temperatures, nickel-based and refractory metal-based alloys are used. Nickel-based high-temperature alloys occupy a particularly important position in the entire field of high-temperature alloys. They are widely used to manufacture the hottest components of aviation jet engines and various industrial gas turbines.
IN718 features and application areas
Inconel 718 superalloy (IN718 for short) has been used in aerospace engines for half a century. It was invented and used in turbine parts by INCO Huntington Alloys (now Special Meatals Co.) in the United States in the early 1960s. After manufacturing, IN718 has become the most widely used nickel-based high-temperature alloy material in the history of aerospace engines. The unique alloy composition design of IN718 gives it good comprehensive properties, namely high strength, creep resistance and fatigue life, good ductility, excellent oxidation resistance, especially at temperatures below 650°C, its mechanical properties Has very good stability. Many parts of modern aeroengines, such as turbine disks, blades, brakes, shafts, stators, seals, supports, pipelines, fasteners, etc., are made of IN718.
At the same time, IN718 is also used in nuclear reactors (heat exchanger pipes), submarines (propeller blades, quick disconnect devices, auxiliary propulsion motors), chemical industry (vessels, pumps, valves, pipes), power generation (industrial gas turbines), oil and gas industry ( It has important applications in downhole pipelines, wellhead hardware, flare arms) and other fields.
