Claims
- 1. A cladding for use on gas turbine buckets or gas turbine vanes subject to high-temperature corrosive atmospheres, said cladding consisting essentially of, by weight, 25-35 percent chromium, 15-35 percent nickel, 0-15 percent cobalt, 3-6 percent aluminum, 0.1-1.5 percent yttrium, balance iron, said cladding having a crystal structure at least 66 percent face centered cubic and a nickel plus cobalt content of at least 30 percent by weight.
- 2. A cladding according to claim 1 consisting essentially of by weight about 25 percent chromium, 15 percent nickel, 15 percent cobalt, 4 percent aluminum, 1 percent yttrium, balance iron.
- 3. a cladding according to claim 1 consisting essentially of by weight about 25 percent chromium, 30 percent nickel, 4 percent aluminum, 1.0 percent yttrium, balance iron.
- 4. A cladding according to claim 1 consisting essentially of by weight about 25 percent chromium, 35 percent nickel, 4 percent aluminum, 0.15 percent yttrium, balance iron.
- 5. A cladding according to claim 1 which, on solution heat treating at 1800.degree. F to 2350.degree. F for 30 minutes to eight hours followed by quenching, is characterized by a crystal structure substantially 100 percent face centered cubic.
- 6. A cladding according to claim 5 which, on solution heat treating at 2200.degree. F for 30 minutes followed by quenching, is characterized by a crystal structure substantially 100 percent austenitic.
- 7. A gas turbine bucket or gas turbine vane comprising:
- a core member of a superalloy having a major constituent selected from the group consisting of nickel and cobalt and further characterized by being essentially free of iron; and
- a cladding surrounding said core member, said cladding consisting essentially of, by weight, 25-35 percent chromium, 15-35 percent nickel, 0-15 percent cobalt, 3-6 percent aluminum, 0.1-1.5 percent yttrium, balance iron, said cladding having a crystal structure at least 66 percent face centered cubic.
- 8. The article of claim 7 wherein said cladding consists essentially of, by weight, about 25 percent chromium, 15 percent nickel, 15 percent cobalt, 4 percent aluminum, 1 percent yttrium, balance iron.
- 9. The article of claim 7 wherein said cladding consists essentially of, by weight, about 25 percent chromium, 35 percent nickel, 4 percent aluminum, 0.15 percent yttrium, balance iron.
- 10. The article of claim 7 wherein said cladding has a crystal structure substantially 100 percent face centered cubic.
- 11. The article of claim 7 wherein said core member and said cladding have closely matching coefficients of thermal expansion to minimize shear stress at the bond interface therebetween.
CROSS-REFERENCE TO RELATED APPLICATION
This is a continuation-in-part of U.S. application Ser. No. 692,512, filed June 3, 1976, now abandoned.
BACKGROUND OF THE INVENTION
This invention was made under contract with the United States Government, Maritime Administration of the Department of Commerce, Contract 0-35510. The U.S. Government is licensed in accordance with the terms of the aforesaid contract and has reserved the rights set forth in Sections 1(f) and 1(9) of the Oct. 10, 1963 Presidential Statement of Government Patent Policy.
US Referenced Citations (8)
Continuations (1)
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Number |
Date |
Country |
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692512 |
Jun 1976 |
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