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Alloy 718 is an age-hardenable Alloy-chromium alloy that combines corrosion resistance with high strength and good fabricability. It has high creep-rupture strength at temperatures up to 700 OC. Its excellent relaxation resistance contributes to its application in springs.
Gas turbine engines
3. Hot Forming
Because of its strength, INCONEL alloy 718 is more resistant than most materials to deformation during hot forming. It is readily hot-worked if sufficiently powerful equipment is used. Hot forming is performed in the 1650°-2050°F temperature range. In the last operation, the metal should be worked uniformly with a gradually decreasing temperature, finishing with some light reduction in the 1650°-1750°F range. This procedure is necessary to ensure notch ductility in stress-rupture applications when material has been annealed and aged. In heating for hot working, the material should be brought up to temperature, allowed to soak a short time to ensure uniformity, and withdrawn. To avoid duplex grain structure INCONEL alloy 718 should be given uniform reductions. Final reductions of 20% minimum should be used for open-die work and 10% minimum for closed-die work. Parts should generally be aircooled from the hot-working temperature rather than waterquenched. Care should be taken to avoid overheating the metal by heat buildup due to working. Also, the piece should be reheated when any portion has cooled below 1650°F. Preheating tools and dies to 500°F is recommended. Any ruptures appearing on the surface of the workpiece must be removed at once. Following annealing and aging, specimens were rupturetested at 1200°F and 100 ksi. Success in achieving notchrupture ductility with forgings of alloy 718 through this type of procedure has also been reported by others.
4. Cold Forming
INCONEL alloy 718 can be cold-formed by standard procedures used for steel and stainless steel.
INCONEL alloy 718 can be readily machined, but its high strength and work-hardening characteristics must be considered in the selection and use of proper tool materials and design, operating speeds, and coolants. When machined in the age-hardened condition the alloy will have a slightly better finish; chip action on chipbreaker tools will be better. The use of annealed material, however, provides easier machining and longer tool life.
6. Super-Plastic Forming
This alloy, designated INCONEL alloy 718SPF, is available as annealed sheet in thicknesses from 0.02 to 0.08 inches (0.5 to 2.0 mm) in widths up to 36 inches (914 mm). The specification SAE AMS 5950 was developed to define the requirements for the alloy.
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