U720, U720LI Alloy

Alloy name: U720, U720LI
Diagram No.: 914
Type of diagram: TTT
Chemical composition in weight %:
U720 alloy: 2.25-2.75% Al, 0.010-0.020% B, 0.010-0.020% C, 15.5-16.5% Cr, 14-15.5% Co, 2.75-3.25% Mo, 55.16-59.705% Ni, 4.75-5.25% Ti, 1.0-1.5% W, 0.025-0.050% Zr
U720LI alloys: 16.02% Cr, 14.81% Co, 5.1% Ti, 2.63% Al, 2.98% Mo, 1.19% W, 0.009% C, 0.014% B, balance is Ni.
Alloy group: Nickel-based alloys
In the original paper presented to the Seven Springs meeting, concerned with thermodynamic calculations for Ni-based superalloys, the case of TCP stability in U720 and U720LI was examined. It was possible to show that the somewhat minor change in composition of U720 to U720LI would cause a sharp drop in Sigma stability, consistent with the experimental results of Keefe et al. [32]. However at that time it was not possible to calculate the TTT diagram. This has now been achieved and Figure shows the calculated results with the experimental observations of Keefe et al. [32]. The results match the different behaviour of the two alloys rather well.
Note: Calculated TTT diagrams for U720 and U720LI with experimental results of Keefe et al. [32] superimposed.
Reference: Not shown in this demo version.

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