High strength, hot corrosion and oxidation resistant, equiaxed nickel base superalloy and articles and method of making
OwnerAlan D. Cetel, Dilip M. Shahinventors
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Abstract
Corrosion and oxidation resistant, high strength, directionally solidified superalloy alloys and articles are described. The articles have a nominal composition in weight percent of about 12.1% Cr, 9% Co, 1.9% Mo, 3.8% W, 5% Ta, 3.6% Al, 4.1% Ti, 0.013% B, 0.1 % C, up to about 0.01 Zr, balance essentially nickel. The resultant articles have good hot corrosion resistance, oxidation resistance and creep properties. The articles are preferably cast as equiaxed articles such as gas turbine engine components.
Claims23
A high strength, corrosion and oxidation resistant nickel base superalloy consisting essentially of, in weight percent, of:
- 11-13.25% chromium;
- 8-10% cobalt;
- 1.5-2.5% molybdenum;
- 3.25-4.5% tungsten;
- 4.5-5.5% tantalum;
- 3.25-4% aluminum;
- 3.5-4.5% titanium;
- 0.005-0.02% boron;
- up to about 0.03 zirconium;
- 0.05-0.2% carbon;
- up to about 0.15% hafnium;
- and balance essentially nickel;
- said article having creep rupture at 1400° F. of at least roughly 2.5×, and at 1600° F. of at least roughly 2× compared to a similar equiaxed article having a nominal composition of 14 Cr, 4.9 Ti, 1.6 Mo, 3.8 W, 2.8 Ta, 3 Al, 9.5 Co, 0.01 B, 0.02 Zr, 0.1 C, and balance Ni.
A high strength, corrosion resistant, nickel base superalloy article adapted for use in equiaxed grain articles, comprising in weight percent 11-13.25% chromium;
- 8-10% cobalt;
- 1.5-2.5% molybdenum;
- 3.25-4.5% tungsten;
- 4.5-5.5% tantalum;
- 3.25-4% aluminum;
- 3.5-4.5% titanium;
- 0.005-0.02% boron;
- less than about 0.03% zirconium;
- 0.05-0.2% carbon;
- up to about 0.15% hafnium;
- and balance essentially nickel;
- said article having creep rupture at 1400° F. of at least roughly 2.5×, and at 1600° F. of at least roughly 2× compared to a similar equiaxed article having a nominal composition of 14 Cr, 4.9 Ti, 1.6 Mo, 3.8 W. 2.8 Ta, 3 Al, 9.5 Co, 0.01 B, 0.02 Zr, 0.1 C, and balance Ni.
A method of producing an equiaxed, cast, high strength, corrosion resistant, nickel base superalloy article comprising the steps of:
- melting an alloy consisting of in weight percent 11-13.25% chromium;
- 8-10% cobalt;
- 1.5-2.5% molybdenum;
- 3.25-4.5% tungsten;
- 4.5-5.5% tantalum;
- 3.25-4% aluminum;
- 3.5-4.5% titanium;
- 0.005-0.02% boron;
- less than about 0.03% zirconium;
- 0.05-0.2% carbon;
- up to about 0.15% hafnium;
- and balance essentially nickel;
- and
- casting the alloy to form an article, wherein the article has creep rupture at 1400° F. of at least roughly 2.5×, and at 1600° F. of at least roughly 2× compared to a similar equiaxed article having a nominal composition of 14 Cr, 4.9 Ti, 1.6 Mo, 3.8 W, 2.8 Ta, 3 Al, 9.5 Co, 0.01 B, 0.02 Zr, 0.1 C, and balance Ni.
Dependencies are inferred from the claim text.