ATI 718Plus Alloy

Alloy name: ATI 718Plus
Diagram No.: 1114
Type of diagram: TTT
Chemical composition in weight %: 17.97% Cr, 9.09% Co, 9.64% Fe, 2.69% Mo, 1.02% W, 5.49% Nb, 1.6% Al, 0.75% Ti, 0.009% P, 0.005% B, 0.022% C, balance is Ni
Alloy group: Nickel-based alloys
Note: TTT diagram of Eta/Delta phase precipitation in 718Plus wrought billet.
The precipitation data was fitted using 2nd order polynomials, and the annealing times for specific phase content interpolated to produce the TTT diagram in Figure. As expected, the nose appears to be slightly below 950C. The shape and nose of the diagram correlate very well with the results by Stotter et al., although their diagram is shifted towards shorter times, probably due to differences in the starting material. The structural results obtained in this study reflect the behavior of small samples that were given various single heat treatments, and therefore reflect accurately the local material behavior. In large components, where thermal delays lead to slower transformation, the nose of the curves is likely to shift to the longer times, even if the shape of the curves is expected to remain similar.
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