718 Alloy

Alloy name: 718
Diagram No.: 1055
Type of diagram: TTT
Chemical composition in weight %: 50.00-55.00% Ni, 17.00-21.00% Cr, 4.75-5.50% Cb, 2.80-3.30% Mo, 0.20-0.80% Al, 0.65-1.15% Ti, max. 0.35% Mn, max. 0.35% Si, max. 0.006% B, max. 0.08% C, max. 0.15% S, Mg residual, balance is Fe
Alloy group: Nickel-based alloys
Note: Time-temperature-transformation diagram for alloy 718. Note that the material was solution-annealed at 2100 F (1149 C) for 1 hour and water-quenched.
A time-temperature-transformation diagram (T-T-T) for alloy 718 is shown in Figure. The T-T-T diagram shows a number of phases that precipitate in alloy 718 base metal: gamma prime, CbC, MeC, delta phase (Ni3Cb), and laves phase. All of these phases go into solution around 1950 F (1065 C). Because the grain-boundary phases are going into solution and are therefore no longer pinning the boundaries, grain growth occurs at temperatures above about 1900 F (1040 C).
Reference: Not shown in this demo version.

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