US4144380A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Claddings of high-temperature austenitic alloys for use in gas turbine buckets and vanes
Assignee: General Electric Co
•
Filing: 1977-08-10
•
Granted: 1979-03-13
•
Expires: 1997-08-10
Abstract
Abstract Austenitic alloys are disclosed which consist of iron, nickel, cobalt, chromium, aluminum, and yttrium, and articles utilizing these alloys are described such as claddings for gas turbine buckets. The substitution of selected quantities of nickel or nickel and cobalt in prior art ferrous alloys, together with the use of rather high levels of chromium, yields articles having excellent high-temperature strength, oxidation and hot corrosion resistance, and diffusion and thermal expansion compatibility with superalloy substrates.
Inventors
- 👤 Adrian M. Beltran
- 👤 William F. Schilling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:35
CPC Classifications
C; C23; C23C; C23C30/00; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/52; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12861; Y10T428/12937
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
67 words
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.
Claim 2
Dependent Claim
67 words
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.
Claim 3
Dependent Claim
29 words
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.
Claim 4
Dependent Claim
26 words
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.
Claim 5
Dependent Claim
26 words
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.
Claim 6
Dependent Claim
38 words
A cladding according to claim 1 which, on solution heat treating at 1800° F to 2350° F for 30 minutes to eight hours followed by quenching, is characterized by a crystal structure substantially 100 percent face centered cubic.
Claim 7
Dependent Claim
30 words
A cladding according to claim 5 which, on solution heat treating at 2200° F for 30 minutes followed by quenching, is characterized by a crystal structure substantially 100 percent austenitic.
Claim 8
Dependent Claim
81 words
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.
Claim 9
Dependent Claim
81 words
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.
Claim 10
Dependent Claim
31 words
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.
Claim 11
Dependent Claim
28 words
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.
Claim 12
Dependent Claim
18 words
The article of claim 7 wherein said cladding has a crystal structure substantially 100 percent face centered cubic.
Claim 13
Dependent Claim
28 words
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.
References Cited (Backward Citations)
US3017265A
Cited
US3027252A
Cited
US3420660A
Cited
US3619180A
Cited
US3649225A
Cited
US3754898A
Cited
US4034142A
Cited
US4005989A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-03-12 | 1982-09-11 | 1983-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-03-12 | 1986-09-11 | 1987-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-03-12 | 1990-09-11 | 1991-03-13 | $7700.00 | Window Closed / Lapsed |