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US4853044A Expired / Lapsed US ⏱️ 0.0 years remaining

Alloy suitable for making single crystal castings

Assignee: Rolls Royce PLC
•
Filing: 1988-01-13
•
Granted: 1989-08-01
•
Expires: 2008-01-13
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Abstract

Abstract An alloy suitable for making single crystal castings consists essentially of the following constituents by weight percent: ______________________________________ Chromium 8-15% Aluminum 5-7% Titanium 2-5% Niobium 0.1-2% Molybdenum 0-7% Tantalum 1-8% Tungsten 0-7% Cobalt 5-15% Vanadium 0.5-2% Carbon 0-0.05% Balance Nickel plus impurities. ______________________________________ The combined weight of Tungsten, Molybdenum and Tantalum is from 2.5 to 8.0 percent by weight of the total alloy weight and the combinations of Aluminium, Titanium, Niobium, Tantalum and Vanadium are balanced such as to give an alloy volume fraction of between 60 and 75% of gamma prime (Ni 3 (M)) where M is Aluminium, Titanium, Niobium, Tantalum, Vanadium and also minimum gamma/gamma prime lattice mismatch. The alloy has good high strength characteristics, impact resistance, corrosion and oxidation resistance and has a wide heat treatment window.

Inventors

  • 👤 David A. Ford
  • 👤 Anthony D. Hill
  • 👤 Ian R. Pashby

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-31 18:44
CPC Classifications
C; C30; C30B; C30B11/00; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/056; C30B29/00; C30B29/10; C30B29/52; C30B33/00

Claims Analysis

Total Claims: 9
Claim 1
Independent Claim 110 words
A single crystal casting cast from an alloy consisting essentially of, by weight percent: ______________________________________ Chromium 8-15% Aluminum 5-7% Titanium 2-5% Niobium 0.1-2% Molybdenum 0-7% Tantalum 1-8% Tungsten 0-7% Cobalt 5-15% Vanadium 0.5-2% Carbon 0-0.5% ______________________________________ Balance Nickel plus impurities, provided that the combined weight of Tungsten, Molybdenum and Tantalum is from 2.5 to 8.0 percent by weight of the total alloy weight and that the combination of Aluminum, Titanium, Niobium, Tantalum and Vanadium are balanced such as to give an alloy volume fraction of between 60 and 75% of gamma prime (Ni 3 (M)) where M is Aluminum, Titanium, Niobium, Tantalum, Vanadium, and also minimum gamma/gamma prime lattice mismatch.
Claim 2
Dependent Claim 110 words
A single crystal casting cast from an alloy consisting essentially of, by weight percent: ______________________________________ Chromium 8-15% Aluminum 5-7% Titanium 2-5% Niobium 0.1-2% Molybdenum 0-7% Tantalum 1-8% Tungsten 0-7% Cobalt 5-15% Vanadium 0.5-2% Carbon 0-0.5% ______________________________________ Balance Nickel plus impurities, provided that the combined weight of Tungsten, Molybdenum and Tantalum is from 2.5 to 8.0 percent by weight of the total alloy weight and that the combination of Aluminum, Titanium, Niobium, Tantalum and Vanadium are balanced such as to give an alloy volume fraction of between 60 and 75% of gamma prime (Ni 3 (M)) where M is Aluminum, Titanium, Niobium, Tantalum, Vanadium, and also minimum gamma/gamma prime lattice mismatch.
Claim 3
Dependent Claim 41 words
A single crystal casting as claimed in claim 1 consisting essentially of, by weight percent: ______________________________________ Chromium 10.0% Aluminum 5.8% Titanium 2.5% Niobium 0.8% Molybdenum 1.6% Tantalum 1.6% Tungsten 3.3% Cobalt 10.0% Vanadium 0.8% Carbon 0.01% Balance Nickel plus impurities. ______________________________________
Claim 4
Dependent Claim 40 words
A single crystal casting as claimed in claim 1 consisting essentially of, by weight: ______________________________________ Chromium 9.0% Aluminum 6.0% Titanium 2.5% Niobium 1.0% Molybdenum 1.5% Tantalum 2.0% Tungsten 3.0% Cobalt 10.0% Vanadium 1.0% Carbon 0.01% Balance Nickel plus impurities. ______________________________________
Claim 5
Dependent Claim 48 words
A method of manufacturing a single crystal having the composition claimed in claim 1, the method comprising the steps of forming a melt having said composition and allowing the melt to solidify while controlling the rate of solidification and conditions of solidification to form a single crystal alloy.
Claim 6
Dependent Claim 50 words
A method according to claim 4 wherein the solidified alloy is heat treated by heating the alloy at a temperature between 1250° C. and the alloy solidus for between one and five hours followed by heating the alloy at 1100° C. for one hour and 850° C. for 16 hours.
Claim 7
Dependent Claim 12 words
A single crystal casting formed from an alloy claimed in claim 1.
Claim 8
Dependent Claim 37 words
A single crystal casing as claimed in claim 1, wherein said single crystal has an average time until failure of 108.2 hours when maintained at a temperature of 850° C. and under a stress of 550 MPa.
Claim 9
Dependent Claim 37 words
A single crystal casting as claimed in claim 1, wherein said single crystal has an average time until failure of 119.7 hours when maintained at a temperature of 1050° C. and under a stress of 145 MPa.

References Cited (Backward Citations)

US4459160A Cited
GB2105369A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-07-31 1993-01-30 1993-08-01 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-07-31 1997-01-30 1997-08-01 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-07-31 2001-01-30 2001-08-01 $7700.00 Window Closed / Lapsed

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