Despite the development of newer nickel alloys like Waspaloy, Rene 41, and Alloy 625, Alloy 718 remains the benchmark for a simple reason: It offers the best cost-to-performance ratio across a wide range of operating conditions.
Advantages over other aerospace superalloys:
Easier to weld and fabricate
Lower material and processing costs
Good availability in bar, plate, sheet, and forgings
Established pedigree with extensive aerospace approvals (AMS, ASTM, and ISO standards)
Because of this, Alloy 718 is not only specified in legacy platforms but continues to be incorporated into next-generation engines and launch systems.