US4528048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanically worked single crystal article
Assignee: RTX Corp
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Filing: 1982-12-06
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Granted: 1985-07-09
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Expires: 2002-12-06
Abstract
Abstract A single crystal nickel base superalloy component, such as a gas turbine blade (20, 28) is mechanically deformed at elevated temperature to improve the yield strength of a portion which is used at temperatures below 800° C., compared to a portion which is used at a higher temperature. A blade (20) has a root (22) which is deformed by 2-14% at 700°-1100° C. and an airfoil (24) which is not deformed. The root yield strength is increased 15-50% while the airfoil creep strength is maintained.
Inventors
- 👤 Maurice L. Gell
- 👤 Anthony F. Giamei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:51
CPC Classifications
C; C30; C30B; C30B33/00; C30B29/00; C30B29/10; C30B29/52; Y; Y10; Y10S; Y10S148/00; Y10S148/902
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
105 words
A single crystal article made of nickel superalloy of the gamma-gamma prime type, the alloy lacking grain boundary strengtheners such as zirconium, boron and hafnium, characterized by a first portion of said part having a 0.2% yield strength at about 600° C. which is at least 15% greater than the corresponding yield strength in a second portion of the part, the first portion having had its cross sectional shape altered by deforming it 2-14% with a strain rate of less than 10 -1 cm/cm/sec at a temperature in the range 700°-1100° C. to provide it with a greater density of dislocations than the second portion.
Claim 2
Dependent Claim
105 words
A single crystal article made of nickel superalloy of the gamma-gamma prime type, the alloy lacking grain boundary strengtheners such as zirconium, boron and hafnium, characterized by a first portion of said part having a 0.2% yield strength at about 600° C. which is at least 15% greater than the corresponding yield strength in a second portion of the part, the first portion having had its cross sectional shape altered by deforming it 2-14% with a strain rate of less than 10 -1 cm/cm/sec at a temperature in the range 700°-1100° C. to provide it with a greater density of dislocations than the second portion.
Claim 3
Dependent Claim
19 words
The article of claim 1 characterized by a first portion having been deformed at a temperature of 900°-1000° C.
Claim 4
Dependent Claim
35 words
The article of claim 1 shaped as a gas turbine blade and characterized by being made from a casting wherein the first portion is the blade root part and the second portion is the airfoil.
Claim 5
Dependent Claim
20 words
The article of claim 3 having the [001] crystallographic axis lying within 20° of the z axis of the blade.
Claim 6
Dependent Claim
62 words
A gas turbine component made of a multiplicity of bonded-together single crystal nickel superalloy parts of essentially identical composition, characterized by a first part which has been deformed 2-14% at a temperature of 700°-1100° C., and a second part which has not been deformed at a temperature of 700°-1100° C., the first part having a higher yield strength than the second part.
Claim 7
Dependent Claim
62 words
A gas turbine component made of a multiplicity of bonded-together single crystal nickel superalloy parts of essentially identical composition, characterized by a first part which has been deformed 2-14% at a temperature of 700°-1100° C., and a second part which has not been deformed at a temperature of 700°-1100° C., the first part having a higher yield strength than the second part.
Claim 8
Dependent Claim
39 words
The component of claim 5 shaped as a gas turbine blade wherein the part which has been deformed is a central spar and the part which has not been deformed is a shell surrounding and attached to the spar.
References Cited (Backward Citations)
US3228095A
Cited
US3494709A
Cited
US3642543A
Cited
US4184900A
Cited
US4345950A
Cited
US4392894A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |