Nickel-based superalloy 718, also known as Inconel 718 (UNS N07718/W.Nr. 2.4668), is a precipitation-hardening nickel-chromium-iron alloy that combines good machinability, high-temperature strength, excellent corrosion resistance, and weldability. It is widely used in key applications such as aerospace, nuclear power, marine engineering, and high-temperature chemical engineering. Its primary strengthening mechanism stems from the presence of two precipitated phases: γ″ (Ni₃Nb) and γ′ (Ni₃(Al,Ti)), resulting in excellent creep rupture strength and durability below 650°C.
