US4222794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Single crystal nickel superalloy
Assignee: RTX Corp
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Filing: 1979-07-02
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Granted: 1980-09-16
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Expires: 1999-07-02
Abstract
Abstract A specific composition range and process sequence are described for the production of single crystal superalloy articles which have an exceptional combination of high temperature mechanical properties and resistance to oxidation and hot corrosion. The nominal composition is 5.2% Cr, 5.4% Al, 1.1% Ti, 2.0% Mo, 4.9% W, 6.4% Ta, 3% Re, 0.4% V, balance nickel. Material of this composition is cast and solidified in single crystal form and heat treated to produce an optimum microstructure.
Inventors
- 👤 Frederick A. Schweizer
- 👤 David N. Duhl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:27
CPC Classifications
C; C30; C30B; C30B11/00; C30B29/00; C30B29/10; C30B29/52; C30B33/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
130 words
A heat treated single crystal superalloy article suited for use as an element in a gas turbine engine which consists of: 4.5 to 6% Cr, 5.0 to 5.8% Al, 0.8 to 1.5% Ti, 1.7 to 2.3% Mo, 4 to 6% W, 5.5 to 8% Ta, 1 to 5% Re, 0.2 to 0.6% V, 0 to 7% Co, balance essentially nickel, said article being free from internal grain boundaries and consisting of from about 60 to 65% of the gamma prime phase in a gamma matrix, with the average gamma prime particle size being less than about 0.5 micron, said article having a 1.0% creep life in excess of 80 hours and a rupture life in excess of 240 hours when tested at 1800° F. and a 36 KSI applied stress.
Claim 2
Dependent Claim
130 words
A heat treated single crystal superalloy article suited for use as an element in a gas turbine engine which consists of: 4.5 to 6% Cr, 5.0 to 5.8% Al, 0.8 to 1.5% Ti, 1.7 to 2.3% Mo, 4 to 6% W, 5.5 to 8% Ta, 1 to 5% Re, 0.2 to 0.6% V, 0 to 7% Co, balance essentially nickel, said article being free from internal grain boundaries and consisting of from about 60 to 65% of the gamma prime phase in a gamma matrix, with the average gamma prime particle size being less than about 0.5 micron, said article having a 1.0% creep life in excess of 80 hours and a rupture life in excess of 240 hours when tested at 1800° F. and a 36 KSI applied stress.
Claim 3
Independent Claim
139 words
A method for producing a single crystal super-alloy article, suited for use as an element in a gas turbine engine, which consists of: a. providing a composition consisting essentially of 4.5 to 6% Cr, 5.0 to 5.8% Al, 0.8 to 1.5% Ti, 1.7 to 2.3% Mo, 4 to 6% W, 5.5 to 8% Ta, 1 to 5% Re, 0.2 to 0.6% V, 0 to 7% Co, balance essentially nickel; b. melting and directionally solidifying the composition to produce a single crystal article; c. heat treating the article between about 2445° and 2465° F. for from about 1 to 10 hours; d. cooling the article; e. reheating the article to at least one temperature between about 1500° and 2100° F. and holding the article within the temperature range of 1500° to 2100° F. for from about 2 to 50 hours.
Claim 4
Independent Claim
139 words
A method for producing a single crystal super-alloy article, suited for use as an element in a gas turbine engine, which consists of: a. providing a composition consisting essentially of 4.5 to 6% Cr, 5.0 to 5.8% Al, 0.8 to 1.5% Ti, 1.7 to 2.3% Mo, 4 to 6% W, 5.5 to 8% Ta, 1 to 5% Re, 0.2 to 0.6% V, 0 to 7% Co, balance essentially nickel; b. melting and directionally solidifying the composition to produce a single crystal article; c. heat treating the article between about 2445° and 2465° F. for from about 1 to 10 hours; d. cooling the article; e. reheating the article to at least one temperature between about 1500° and 2100° F. and holding the article within the temperature range of 1500° to 2100° F. for from about 2 to 50 hours.
References Cited (Backward Citations)
US4116723A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-09-16 | 1984-03-17 | 1984-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-09-16 | 1988-03-17 | 1988-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-09-16 | 1992-03-17 | 1992-09-16 | $7700.00 | Window Closed / Lapsed |