US4325756A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fatigue resistant nickel superalloy
Assignee: RTX Corp
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Filing: 1980-01-28
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Granted: 1982-04-20
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Expires: 2000-01-28
Abstract
Abstract Disclosed is a nickel base alloy of the gamma-gamma prime type, the composition of which is controlled, to provide a gamma matrix phase in which solid solution hardener elements are minimized, to less than 12.5 weight percent. Preferably, the alloy consists essentially by weight percent of 0.25-9Al, 1-4Ti, 2-6Cb, 0.01-0.1C, at least one material selected from the group consisting by weight percent of 0-6Co, 0-6Mo, 2-7.5Cr, 0-2.5Hf and mixtures thereof, balance nickel. The gamma prime fraction in a heat treated article is in the range 10-45 volume percent. The stacking fault energy is preferably in the range 80-120 ergs/cm 2 . A gas turbine engine disc made of the material exhibits a three fold increase in fatigue life in the 550-750° C. range, as compared to discs made of typical superalloys in current use, while retaining comparable tensile and stress rupture strength.
Inventors
- 👤 Edgar E. Brown
- 👤 Duane L. Ruckle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:31
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
97 words
As an article of manufacture, a gas turbine disc having improved fatigue resistance in the 550°-750° C. range, said disc being formed of a gamma-gamma prime fatigue resistant nickel base alloy consisting essentially by weight percent of 0.25-9 Al, 1-4 Ti, 2-6 Cb, 0.01-0.1 C, and at least one material comprising 5-13 weight percent, said material selected from the group consisting by weight percent of 0-6 Co, 0-6 Mo, 2-7.5 Cr, 0-2.5 Hf and mixtures thereof balance nickel, the article further having a composition and heat treatment which provides between 10 and 45 volume percent gamma prime.
Claim 2
Dependent Claim
97 words
As an article of manufacture, a gas turbine disc having improved fatigue resistance in the 550°-750° C. range, said disc being formed of a gamma-gamma prime fatigue resistant nickel base alloy consisting essentially by weight percent of 0.25-9 Al, 1-4 Ti, 2-6 Cb, 0.01-0.1 C, and at least one material comprising 5-13 weight percent, said material selected from the group consisting by weight percent of 0-6 Co, 0-6 Mo, 2-7.5 Cr, 0-2.5 Hf and mixtures thereof balance nickel, the article further having a composition and heat treatment which provides between 10 and 45 volume percent gamma prime.
Claim 3
Dependent Claim
18 words
The article of claim 1 further having a stacking fault energy of about 80-120 ergs per square centimeter.
Claim 4
Dependent Claim
91 words
As an article of manufacture, a gas turbine disc having improved fatigue resistance in the 550°-750° C. range, said disc being formed of a nickel base alloy consisting essentially by weight percent of 0.25-9 Al, 1-4 Ti, 2-6 Cb, 0.01-0.1 C, 0.5-1.5 Hf, and 2-13 gamma phase hardener selected from the group consisting of Cr, Co, Mo, and mixtures thereof, said disc having a composition and heat treatment which provides 10-45 volume percent gamma prime phase, and a gamma phase stacking fault energy substantially greater than 30 ergs per square centimeter.
Claim 5
Dependent Claim
91 words
As an article of manufacture, a gas turbine disc having improved fatigue resistance in the 550°-750° C. range, said disc being formed of a nickel base alloy consisting essentially by weight percent of 0.25-9 Al, 1-4 Ti, 2-6 Cb, 0.01-0.1 C, 0.5-1.5 Hf, and 2-13 gamma phase hardener selected from the group consisting of Cr, Co, Mo, and mixtures thereof, said disc having a composition and heat treatment which provides 10-45 volume percent gamma prime phase, and a gamma phase stacking fault energy substantially greater than 30 ergs per square centimeter.
Claim 6
Dependent Claim
21 words
The article of claim 1 in which the alloy has iron substituted for nickel in amounts up to 40 weight percent.
Claim 7
Dependent Claim
28 words
The article of claim 1 wherein the alloy consists essentially by weight percent of 4 Al, 2 Cb, 1 Ti, 5 Cr, 0.05 C, 0.8 Hf, balance Ni.
Claim 8
Dependent Claim
28 words
The article of claim 1 wherein the alloy consists essentially by weight percent of 0.5 Al, 5 Cb, 1.5 Ti, 33 Fe, 5 Co, 0.03 C, balance Ni.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-19 | 1985-10-19 | 1986-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-19 | 1989-10-19 | 1990-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-19 | 1993-10-19 | 1994-04-20 | $7700.00 | Window Closed / Lapsed |