What are the application areas of Inconel 718?
Inconel 718 Description
Inconel 718 alloy is a precipitation hardening nickel-chromium iron alloy containing niobium and molybdenum. It has high strength, good toughness at 700°C and corrosion resistance in high and low temperature environments. The delivery state can be solution treated or precipitation hardened. GH4169 alloy has an austenitic structure, and the γ" phase generated after precipitation hardening gives it excellent mechanical properties. The δ phase generated at the grain boundaries during heat treatment gives it the best plasticity.
The application areas of Inconel 718
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, that is, high strength, creep resistance and fatigue life, especially at temperatures below 650°C, its mechanical properties have good stability. Many parts of modern aeroengines, such as turbine disks, blades, brakes, shafts, stators, seals, supports, pipelines, fasteners, etc., are made of IN718.
Before the emergence of IN718, stainless steel materials (such as A286) and nickel-based alloys (such as RENE41) were widely used in turbine engines. However, these alloy materials cannot meet the requirements of continuously increasing engine operating temperatures and manufacturing costs. Among them, the mechanical properties of stainless steel materials that can precipitate out strengthening phases have poor stability under high temperature conditions; while RENE41, which contains a large amount of γ" strengthening phases, is prone to quenching cracks after heat treatment due to the low ductility of the material itself. As a result, manufacturing increased and maintainability decreased. The emergence of IN718 solved these problems well, and it quickly became widely used in the field of turbine engine manufacturing.
