US4643782A
Expired / Lapsed
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Single crystal alloy technology
Assignee: Cannon Muskegon Corp
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Filing: 1984-03-19
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Granted: 1987-02-17
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Expires: 2004-03-19
Abstract
Abstract Single crystal nickel-base superalloy having very fine gamma prime after heat treatment in a temperature range permitting total gamma prime solutioning without incipient melting. Component of the heat treated alloy has exceptional resistance to creep under high temperature and stress, particularly in that part of the creep curve representing one percent or less elongation. The alloy exhibits exceptionally low steady-state creep rate.
Inventors
- 👤 Kenneth Harris
- 👤 Gary L. Erickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:46
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/10; C30; C30B; C30B11/00; C30B29/00; C30B29/10; C30B29/52; C30B33/00
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
73 words
A single crystal casting to be used under high stress, high temperature conditions characterized by an increased resistance to creep under such conditions and a heat treat window of approximately 35° F. cast from an alloy consisting essentially of the following elements in the following proportions expressed as percentages of weight: ______________________________________
Co 9.6
Cr 6.6
Mo 0.6
W 6.4
Ta 6.5
Al 5.6
Ti 1.0
Hf 0.10
Re 3.0
Ni Bal
______________________________________
Claim 2
Dependent Claim
73 words
A single crystal casting to be used under high stress, high temperature conditions characterized by an increased resistance to creep under such conditions and a heat treat window of approximately 35° F. cast from an alloy consisting essentially of the following elements in the following proportions expressed as percentages of weight: ______________________________________
Co 9.6
Cr 6.6
Mo 0.6
W 6.4
Ta 6.5
Al 5.6
Ti 1.0
Hf 0.10
Re 3.0
Ni Bal
______________________________________
Claim 3
Dependent Claim
73 words
A single crystal casting to be used under high stress, high temperature conditions characterized by an increased resistance to creep under such conditions and a heat treat window of approximately 35° F. cast from an alloy consisting essentially of the following elements in the following proportions expressed as percentages of weight: ______________________________________
Co 9.3-10.0
Cr 6.4-6.8
Mo 0.5-0.7
W 6.2-6.6
Ta 6.3-6.7
Al 5.45-5.75
Ti 0.8-1.2
Hf 0.07-0.12
Re 2.8-3.2
Ni Bal
______________________________________
Claim 4
Dependent Claim
73 words
A single crystal casting to be used under high stress, high temperature conditions characterized by an increased resistance to creep under such conditions and a heat treat window of approximately 35° F. cast from an alloy consisting essentially of the following elements in the following proportions expressed as percentages of weight: ______________________________________
Co 9.3-10.0
Cr 6.4-6.8
Mo 0.5-0.7
W 6.2-6.6
Ta 6.3-6.7
Al 5.45-5.75
Ti 0.8-1.2
Hf 0.07-0.12
Re 2.8-3.2
Ni Bal
______________________________________
Claim 5
Dependent Claim
35 words
The single crystal casting claimed in either claims 1 or 2 wherein the alloy from which it was cast is characterized by the capability of complete solutioning of the primary gamma prime without incipient melting.
Claim 6
Dependent Claim
36 words
The single crystal casting as claimed in claim 3 further characterized by the capability of the casting to withstanding 36 ksi at 1800° F. for an average 80 hours before sustaining a creep of one percent.
Claim 7
Dependent Claim
13 words
A gas turbine blade cast as claimed in either claims 1 or 2.
Claim 8
Dependent Claim
13 words
A gas turbine vane cast as claimed in either claims 1 or 2.
Claim 9
Dependent Claim
16 words
The casting as claimed in claim 3 wherein the casting is a gas turbine engine blade.
Claim 10
Dependent Claim
16 words
The casting as claimed in claim 3 wherein the casting is a gas turbine engine vane.
Claim 11
Dependent Claim
27 words
The single crystal casting claimed in claim 3 further characterized by the absence of phase instability after testing under temperature and stress sufficient to rupture the casting.
Claim 12
Dependent Claim
101 words
A component for use in a gas turbine engine, cast as a single crystal from an alloy having an incipient melting temperature at least 30° F. above its gamma prime solvus temperature and consisting essentially of the elements Cr 6.4-6.8, Co 9.3-10.0, Mo 0.5-0.7, W 6.2-6.6, Ta 6.3-6.7, Al 5.45-5.75, Ti 0.8-1.2, Hf 0.07-0.12, Re 2.8-3.2, balance Ni, said component after heat treatment at a temperature and for a time period sufficient to solution all its primary gamma prime having the capability of withstanding 36 ksi at 1800° F. (982.2° C.) for 80 hours before sustaining a creep of one percent.
Claim 13
Dependent Claim
101 words
A component for use in a gas turbine engine, cast as a single crystal from an alloy having an incipient melting temperature at least 30° F. above its gamma prime solvus temperature and consisting essentially of the elements Cr 6.4-6.8, Co 9.3-10.0, Mo 0.5-0.7, W 6.2-6.6, Ta 6.3-6.7, Al 5.45-5.75, Ti 0.8-1.2, Hf 0.07-0.12, Re 2.8-3.2, balance Ni, said component after heat treatment at a temperature and for a time period sufficient to solution all its primary gamma prime having the capability of withstanding 36 ksi at 1800° F. (982.2° C.) for 80 hours before sustaining a creep of one percent.
Claim 14
Dependent Claim
52 words
A component as claimed in claim 10 wherein the heat treatment included 2 hours at 2350° F. (1288° C.) plus 2 hours at 2360° F. (1293° C.) then slow cooled, then 2 hours at 2350° F. (1288° C.) plus 2 hours at 2360° F. (1293° C.) followed by a gas fan quench.
Claim 15
Dependent Claim
33 words
A component as claimed in claim 10 wherein the heat treatment included 4 hours at 2350° F. (1288° C.) plus 4 hours at 2360° F. (1293° C.) followed by a gas fan quench.
Claim 16
Dependent Claim
25 words
A component as claimed in claim 12 wherein the component is aged 10 to 30 hours at 1600° F. (871° C.) and then air cooled.
Claim 17
Dependent Claim
72 words
A component for use in a gas turbine engine, cast as a single crystal from an alloy having an incipient melting temperature at least 30° F. above its gamma prime solvus temperature and consisting essentially of the elements Cr 6.4-6.8, Co 9.3-10.0, Mo 0.5-0.7, W 6.2-6.6, Ta 6.3-6.7, Al 5.45-5.75, Ti 0.8-1.2, Hf 0.07-0.12, Re 2.8-3.2, balance Ni and being capable of complete primary gamma prime solutioning with alternate heat treatment cycles.
Claim 18
Dependent Claim
72 words
A component for use in a gas turbine engine, cast as a single crystal from an alloy having an incipient melting temperature at least 30° F. above its gamma prime solvus temperature and consisting essentially of the elements Cr 6.4-6.8, Co 9.3-10.0, Mo 0.5-0.7, W 6.2-6.6, Ta 6.3-6.7, Al 5.45-5.75, Ti 0.8-1.2, Hf 0.07-0.12, Re 2.8-3.2, balance Ni and being capable of complete primary gamma prime solutioning with alternate heat treatment cycles.
References Cited (Backward Citations)
US4371404A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-02-16 | 1990-08-18 | 1991-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-16 | 1994-08-18 | 1995-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-16 | 1998-08-18 | 1999-02-17 | $7700.00 | Window Closed / Lapsed |