Low rhenium single crystal superalloy for turbine blades and vane applications
AssigneeCannon-Muskegon Corporation
InventorsKenneth Harris, Jacqueline B. Wahl
Life of this patent
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Abstract
A low rhenium nickel-base superalloy for single crystal casting that exhibits excellent high temperature creep resistance, while also exhibiting other desirable properties for such alloys, comprises 5.60% to 5.80% aluminum by weight, 9.4% to 9.9% cobalt by weight, 4.9% to 5.5% chromium by weight, 0.08% to 0.35% hafnium by weight, 0.50% to 0.70% molybdenum by weight, 1.4% to 1.6% rhenium by weight, 8.1% to 8.5% tantalum by weight, 0.60% to 0.80 titanium by weight, 7.6 to 8.0% tungsten by weight the balance comprising nickel and minor amounts of incidental impurity elements.
Claims15
A nickel-base superalloy for single crystal casting, comprising:
- 5.60% to 5.80% aluminum by weight;
- 9.4% to 9.9% cobalt by weight;
- 4.9% to 5.5% chromium by weight;
- 0.08% to 0.35% hafnium by weight;
- 0.50% to 0.70% molybdenum by weight;
- 1.4% to 1.6% rhenium by weight;
- 8.1% to 8.5% tantalum by weight;
- 0.60% to 0.80 titanium by weight;
- 7.6 to 8.0% tungsten by weight;
- the balance consisting of nickel and incidental elements, the total amount of incidental elements being 1% or less;
- and
- wherein the casting exhibits a rupture life of at least about 200.2 hours at a temperature of 1800° F. under a load of 36.0 ksi.
A nickel-base superalloy single crystal casting comprising:
- about 5.72% aluminum by weight;
- about 9.7% cobalt by weight;
- about 5.4% chromium by weight;
- about 0.30% hafnium by weight;
- about 0.59% molybdenum by weight;
- about 1.5% rhenium by weight;
- about 8.3% tantalum by weight;
- about 0.71% titanium by weight;
- and
- about 7.8% tungsten by weight;
- the balance consisting of nickel and incidental elements in an amount of 1% or less;
- wherein the casting exhibits a rupture life of at least about 200.2 hours at a temperature of 1800° F. under a load of 36.0 ksi, a rupture life of at least about 983.5 hours at a temperature of 1600° F. under a load of 65 ksi, and a rupture life of at least 199.6 hours at a temperature of 1900° F. under a load of 25 ksi.
Dependencies are inferred from the claim text.