Property Predictions
The TCS Ni-based Superalloys Database (TCNI) database is validated against experimental data of phase composition, and other properties related to the molar volume of phases.
Table 1. Predicted compositions of γ and γ' as well as the fraction in two Ni-base alloys compared with measurements (in brackets) from the literature [2008Sud].
|
at.% |
Ni |
Al |
Cr |
W |
Experimental γ' fraction |
Predicted γ' fraction |
|---|---|---|---|---|---|---|
|
Ni-9.8Al-8.3Cr γ |
82.9 (82.7) |
8.51 (8.43) |
8.61 (8.86) |
- |
|
|
|
Ni-9.8Al-8.3Cr γ' |
76.7 (76.6) |
16.7 (17.4) |
6.63 (5.99) |
- |
18.9 |
15.8 |
|
Ni-9.7Al-8.5Cr-2W γ |
81.5 (81.8) |
6 .75(6.23) |
9 .66(10.48) |
2.06 (1.54) |
||
|
Ni-9.7-l-8.5Cr-2W γ' |
76.4 (76.2) |
15.5 (16.9) |
6.24 (3.94) |
1.87 (3.00) |
30.8 |
33.9 |
Ni-24Al-15Cr-19Co Alloy
|
|
Figure 1: Composition of the (left) γ-A1 and (right) β-B2 phases of Ni-24Al-15Cr-19Co alloy calculated and measured by EPMA [2015Ghe].
Ni-Cr-Al-Mo Alloys
Figure 2: Predicted densities of liquid Ni-Cr-Al-Mo alloys where the molar ratio of Ni:Cr:Al is close to the average value for commercial superalloys INCO713, CM247LC, and CMSX-4. Symbols are experimental values from the literature [2006Fan].
Inconel 600
Figure 3: Predicted lattice parameters of disordered FCC of Inconel 600 at varying temperatures compared to X-ray diffraction data [2004Raj]. At low temperature the calculation gives, besides the disordered FCC, also an ordered L12 phase, which causes the kink in the curve.
Ni-0.6Mo-0.92Ta-12.5Al-1.83Ti-10.5Cr-3.3W
Figure 4: Predicted γ/γ’ lattice mismatch of a Ni-0.6Mo-0.92Ta-12.5Al-1.83Ti-10.5Cr-3.3W (at. %) compared to experimental data [1985Nat].
References
[1985Nat] M. V Nathal, R. A. Mackay, R. G. Garlick, Temperature dependence of γ-γ’ lattice mismatch in Nickel-base superalloys. Mater. Sci. Eng. 75, 195–205 (1985).
[2004Raj] S. Raju, K. Sivasubramanian, R. Divakar, G. Panneerselvam, A. Banerjee, E. Mohandas, M. . Antony, Thermal expansion studies on Inconel-600® by high temperature X-ray diffraction. J. Nucl. Mater. 325, 18–25 (2004).
[2006Fan] L. Fang, Y. F. Wang, F. Xiao, Z. N. Tao, K. MuKai, Density of liquid NiCrAlMo quarternary alloys measured by a modified sessile drop method. Mater. Sci. Eng. B. 132, 164–169 (2006).
[2008Sud] C. K. Sudbrack, T. D. Ziebell, R. D. Noebe, D. N. Seidman, Effects of a tungsten addition on the morphological evolution, spatial correlations and temporal evolution of a model Ni–Al–Cr superalloy. Acta Mater. 56, 448–463 (2008).
[2015Ghe] T. Gheno, X. L. Liu, G. Lindwall, Z.-K. Liu, B. Gleeson, Experimental study and thermodynamic modeling of the Al–Co–Cr–Ni system. Sci. Technol. Adv. Mater. 16, 055001 (2015).