718 alloy is a precipitation-hardened nickel base alloy that exhibits high yield strength, tensile strength and creep cracking strength at temperatures up to 704°C. The aging hardening of 718 alloy is slow, so it will not harden with heating and cooling during annealing and welding. Compared to other nickel-based superalloys with aluminum and titanium added, 718 alloy welds well.

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When alloying elements are added to steel, iron and carbon, the basic components of steel, interact with alloying elements. The purpose of steel alloying is to improve the microstructure and properties of steel by the interaction of alloying elements with iron and carbon and the influence on the phase diagram of iron and carbon and the heat treatment of steel.