Patent US4459160A successfully refreshed from Google Patents.
US4459160A
Expired / Lapsed
US
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Single crystal castings
Assignee: Rolls Royce PLC
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Filing: 1981-09-18
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Granted: 1984-07-10
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Expires: 2001-09-18
Abstract
Abstract An alloy composition intended for use in the form of a single crystal casting comprises a modified nickel-based superalloy. The alloy consists essentially of, by weight percent, 7-13% Chromium, 0-15% Cobalt, 1.25-3% Titanium+1/2 Niobium, 4.5-6.7% Aluminium, 3-12% Tungsten, 0-3.5% Molybdenum, 0-5% Tantalum, 0-2% Hafnium, 0-1.5% Vanadium, 0.015-0.05% Carbon, 0-0.01% Boron, 0-0.05% Zirconium, Balance essentially Nickel plus incidental impurities. The invention also contemplates a heat treatment for the alloy comprising initially heating to 1300°-1320° C. followed by cooling to room temperature and ageing the alloy at a temperature of about 870° C. for 16 hours.
Inventors
- 👤 Geoffrey W. Meetham
- 👤 Michael J. Goulette
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:54
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/056; C30; C30B; C30B11/00; C30B29/00; C30B29/10; C30B29/52
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
40 words
A single crystal casting cast from an alloy consisting essentially of by weight percent: 8-10% Chromium, 3-7% Cobalt, 1.7-2.6% Titanium, 5.25-5.75% Aluminium, 9-11% Tungsten, 2.25-3.2% Tantalum, 0-0.5% Hafnium, 0.015-0.05% Carbon, 0-0.01% Boron, 0.0-0.05% Zirconium, balance essentially Nickel plus incidental impurities.
Claim 2
Dependent Claim
40 words
A single crystal casting cast from an alloy consisting essentially of by weight percent: 8-10% Chromium, 3-7% Cobalt, 1.7-2.6% Titanium, 5.25-5.75% Aluminium, 9-11% Tungsten, 2.25-3.2% Tantalum, 0-0.5% Hafnium, 0.015-0.05% Carbon, 0-0.01% Boron, 0.0-0.05% Zirconium, balance essentially Nickel plus incidental impurities.
Claim 3
Dependent Claim
39 words
The single crystal casting as claimed in claim 1 in which the alloy consists essentially of by weight percent, 9% Chromium, 5% Cobalt, 1.7% Titanium, 5.5% Aluminium, 10% Tungsten, 2.5% Tantalum, 0.015% Carbon, balance essentially Nickel plus incidental impurities.
Claim 4
Dependent Claim
39 words
The single crystal casting as claimed in claim 1 in which the alloy consists essentially of by weight percent, 8.5% Chromium, 5% Cobalt, 1.7% Titanium, 5.5% Aluminium, 9.5% Tungsten, 3.2% Tantalum, 0.02% Carbon, balance essentially Nickel plus incidental impurities.
Claim 5
Dependent Claim
39 words
The single crystal casting as claimed in claim 1 in which the alloy consists essentially of by weight percent, 8.5% Chromium, 5% Cobalt, 2.2% Titanium, 5.5% Aluminium, 9.5% Tungsten, 2.8% Tantalum, 0.015% Carbon, balance essentially Nickel plus incidental impurities.
Claim 6
Dependent Claim
28 words
A solution heat treatment for the single crystal casting of claim 1, 2, 3 or 4 comprising heating the casting to a temperature in the range 1300°-1320° C.
Claim 7
Dependent Claim
30 words
A solution heat treatment as claimed in claim 5 and comprising cooling the casting from said temperature to room temperature at a rate of 70° to 200° C. per minute.
Claim 8
Dependent Claim
24 words
A solution heat treatment as claimed in claim 6 and in which the casting is subsequently heated to a temperature of about 870° C.
Claim 9
Dependent Claim
49 words
A solution heat treatment as claimed in claim 7 and comprising heating the casting to a temperature of about 1320° C. for 4 hours, cooling the casting to room temperature and heating it to a temperature of about 870° C. and maintaining it as this temperature for 16 hours.
References Cited (Backward Citations)
US4116723A
Cited
US4209348A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-07-10 | 1988-01-09 | 1988-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-07-10 | 1992-01-09 | 1992-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-07-10 | 1996-01-09 | 1996-07-10 | $7700.00 | Window Closed / Lapsed |