718 Alloy

Alloy name: 718
Diagram No.: 912
Type of diagram: TTT
Chemical composition in weight %: 17.8-19.1% Fe, 0.03-0.06% C, 0.21- 1.12% Si, 17.9-18.3% Cr, 3.0-3.06% Mo, 5.11-6.17% Nb+Ta, 0.96-1.0% Ti, 0.42-0.47% Al, balance is Ni
Alloy group: Nickel-based alloys
Note: (a) Experimentally observed [30] and calculated [10] TTT diagram for alloy 718.
Figure shows the calculated TTT diagram [10] for a 718 alloy and compares it with experiment [30]. In this case the Gamma', Gamma'' and Delta phases are considered from the solution temperature, while Sigma forms from transformed Gamma at the temperature of calculation. For alloys of this type, the CCT diagram is often of equal importance and it is possible to convert a TTT diagram to a CCT diagram using well-known additivity rules.
Reference: Not shown in this demo version.

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