Ni-Cr-Co alloy for advanced gas turbine engines
First Claim
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1. A nickel-chromium-cobalt based alloy having a composition comprised in weight percent of:
- 17 to 22 chromium 8 to 15 cobalt 4.0 to 9.5 molybdenum up to 7.0 tungsten 1.28 to 1.65 aluminum 1.50 to 2.30 titanium up to 0.80 niobium 0.01 to 0.2 carbon up to 0.015 boron with a balance of nickel and impurities, the alloy further satisfying the following compositional relationships defined with elemental quantities being in terms of weight percent;
2.2<
Al+0.56Ti+0.29Nb<
2.9
6.5<
Mo+0.52W<
9.5
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Abstract
A wrought age-hardenable nickel-chromium-cobalt based alloy suitable for use in high temperature gas turbine transition ducts possessing a combination of three specific key properties, namely resistance to strain age cracking, good thermal stability, and good creep-rupture strength contains in weight percent 17 to 22 chromium, 8 to 15 cobalt, 4.0 to 9.5 molybdenum, up to 7 tungsten, 1.28 to 1.65 aluminum, 1.50 to 2.30 titanium, up to 0.80 niobium, 0.01 to 0.2 carbon, up to 0.01 boron, and up to 3 iron, with a balance of nickel and impurities. Certain alloying elements must be present in amounts according to two equations here disclosed.
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Citations
20 Claims
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1. A nickel-chromium-cobalt based alloy having a composition comprised in weight percent of:
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17 to 22 chromium 8 to 15 cobalt 4.0 to 9.5 molybdenum up to 7.0 tungsten 1.28 to 1.65 aluminum 1.50 to 2.30 titanium up to 0.80 niobium 0.01 to 0.2 carbon up to 0.015 boron with a balance of nickel and impurities, the alloy further satisfying the following compositional relationships defined with elemental quantities being in terms of weight percent;
2.2<
Al+0.56Ti+0.29Nb<
2.9
6.5<
Mo+0.52W<
9.5 - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A nickel-chromium-cobalt based alloy, suitable for use in gas turbine transition ducts, having a composition in weight percent consisting essentially of:
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17.5 to 21.3 chromium 8.3 to 14.2 cobalt 4.3 to 9.3 molybdenum up to 7.0 tungsten 1.29 to 1.63 aluminum 1.59 to 2.28 titanium up to 0.79 niobium 0.034 to 0.097 carbon 0.002 to 0.007 boron up to 2.6 iron with a balance of nickel and impurities, the alloy further satisfying the following compositional relationships defined with elemental quantities being in terms of weight percent;
2.35<
Al+0.56Ti+0.29Nb<
2.84
7.1<
Mo+0.52W<
9.3 - View Dependent Claims (11, 12, 13, 14, 15, 16, 17)
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18. An improved gas turbine engine of the type having a plurality of metal components wherein the improvement comprises at least one of the metal components is comprised in weight percent of:
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17 to 22 chromium 8 to 15 cobalt 4.0 to 9.5 molybdenum up to 7.0 tungsten 1.28 to 1.65 aluminum 1.50 to 2.30 titanium up to 0.80 niobium 0.01 to 0.2 carbon up to 0.015 boron with a balance of nickel and impurities, the alloy further satisfying the following compositional relationships defined with elemental quantities being in terms of weight percent;
2.2<
Al+0.56Ti+0.29Nb<
2.9
6.5<
Mo+0.52W<
9.5 - View Dependent Claims (20)
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19. The improved gas turbine engine wherein the at least one of the metal components is a transition duct.
Specification