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US4888064A Expired / Lapsed US ⏱️ 0.0 years remaining

Method of forming strong fatigue crack resistant nickel base superalloy and product formed

Assignee: General Electric Co
•
Filing: 1986-09-15
•
Granted: 1989-12-19
•
Expires: 2006-09-15
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Abstract

Abstract A novel alloy is provided having approximately the following ingredient formula: ______________________________________ Element Composition in weight % ______________________________________ Ni balance Cr 16 Co 18 Mo 5.00 W 5.00 Al 2.50 Ti 3.00 Nb 3.00 Zr 0.05 B 0.01 C 0.075 ______________________________________ The alloy has a low solvus temperature for the γ' precipitate thus facilitating metal processing and treatment and also forging of the metal. Fatigue crack propagation rate is remarkably low for metal samples cooled at rates of 20° C./min to 200° C./min.

Inventors

  • 👤 Keh-Minn Chang

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-25 00:10
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/10; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/056

Claims Analysis

Total Claims: 15
Claim 1
Independent Claim 63 words
A nickel base superalloy composition consisting essentially of the following composition ______________________________________ Composition in weight % Element From To ______________________________________ Ni balance Cr 13 18 Co 15 20 Mo 3 6 W 3 6 Al 2 4 Ti 2 4 Nb 2 4 Zr 0.02 0.08 B 0.005 0.03 C less than 0.1. ______________________________________ said composition having been supersolvus annealed and slowly cooled.
Claim 2
Dependent Claim 63 words
A nickel base superalloy composition consisting essentially of the following composition ______________________________________ Composition in weight % Element From To ______________________________________ Ni balance Cr 13 18 Co 15 20 Mo 3 6 W 3 6 Al 2 4 Ti 2 4 Nb 2 4 Zr 0.02 0.08 B 0.005 0.03 C less than 0.1. ______________________________________ said composition having been supersolvus annealed and slowly cooled.
Claim 3
Dependent Claim 29 words
The alloy of claim 1 which has a low fatigue crack propagation rate and which has been supersolvus annealed and cooled at a rate of less than 250° C./min.
Claim 4
Dependent Claim 32 words
The alloy of claim 1 which has a low fatigue crack propagation rate, which has been supersolvus annealed and which has been cooled at a rate between 20° C./min and 200° C./min.
Claim 5
Dependent Claim 14 words
The alloy of claim 1 in which the solvus temperature is about 1080° C.
Claim 6
Dependent Claim 42 words
The alloy of claim 1 in which the composition is as follows: ______________________________________ Element Composition in weight % ______________________________________ Ni balance Cr 16 Co 18 Mo 5.00 W 5.00 Al 2.50 Ti 3.00 Nb 3.00 Zr 0.05 B 0.01 C 0.075 ______________________________________
Claim 7
Independent Claim 86 words
The method of preparing a nickel base superalloy which comprises preparing a melt consisting essentially of the following approximate ingredient content ______________________________________ Composition in weight % Element From To ______________________________________ Ni balance Cr 13 18 Co 15 20 Mo 3 6 W 3 6 Al 2 4 Ti 2 4 Nb 2 4 Zr 0.02 0.08 B 0.005 0.03 C less than 0.1. ______________________________________ cooling the melt to a solid, supersolvus annealing the solid, and cooling the solid at a rate of 250° C./min. or less.
Claim 8
Independent Claim 86 words
The method of preparing a nickel base superalloy which comprises preparing a melt consisting essentially of the following approximate ingredient content ______________________________________ Composition in weight % Element From To ______________________________________ Ni balance Cr 13 18 Co 15 20 Mo 3 6 W 3 6 Al 2 4 Ti 2 4 Nb 2 4 Zr 0.02 0.08 B 0.005 0.03 C less than 0.1. ______________________________________ cooling the melt to a solid, supersolvus annealing the solid, and cooling the solid at a rate of 250° C./min. or less.
Claim 9
Dependent Claim 17 words
The method of claim 6 in which the cooling rate is between 20° C./min and 200° C./min.
Claim 10
Dependent Claim 17 words
The method of claim 6 in which the solid is subjected to heat aging following the cooling.
Claim 11
Dependent Claim 22 words
The method of claim 6 in which the solid is subjected to heat aging at about 760° C. for about 16 hours.
Claim 12
Dependent Claim 42 words
The method of claim 6 in which the composition is as follows: ______________________________________ Element Composition in weight % ______________________________________ Ni balance Cr 16 Co 18 Mo 5.00 W 5.00 Al 2.50 Ti 3.00 Nb 3.00 Zr 0.05 B 0.01 C 0.075 ______________________________________
Claim 13
Dependent Claim 16 words
The method of claim 6 in which the alloy is forged after cooling from the melt.
Claim 14
Dependent Claim 19 words
The method of claim 6 in which the cooling of the melt to a solid is by powder atomization.
Claim 15
Dependent Claim 19 words
The method of claim 6 in which the cooling of the melt to a solid is by spray forming.

References Cited (Backward Citations)

US4685977A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1992-12-18 1993-06-19 1993-12-19 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1996-12-18 1997-06-19 1997-12-19 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 2000-12-18 2001-06-19 2001-12-19 $7700.00 Window Closed / Lapsed

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