Alloy name: ALLVAC 718PLUS
Diagram No.: 1102
Type of diagram: TTT
Chemical composition in weight %: 0.025% C, 18.0% Cr, 2.70% Mo, 1.0% W, 9.0% Co, 10.0% Fe, 5.40% Nb, 0.70% Ti, 1.45% Al, 0.007% P, 0.004% B
Alloy group: Nickel-based alloys
Note: TTT Curve of Delta Phase Precipitation of As-Forged Alloy 718Plus. Determined by Experiment.
An isothermal annealing study was carried out on alloy 718Plus plate hot-rolled at 1010C. The results are presented in Figure. Little Delta phase existed in the initial as-rolled condition and extensive .. phase precipitation occurred during solution treatment. It seems that Delta phase precipitation is structure-sensitive. It occurs first on grain boundaries, then on twin boundaries and eventually grain interiors. The nose temperature of Delta phase precipitation is around 900-950C. It seems that hot working accelerated Delta phase precipitation at twin and intragranular locations. This result has an important practical meaning because, as stated below, massive Delta phase formation will lead to significant degradation in mechanical properties of this alloy.
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