US4226644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High gamma prime superalloys by powder metallurgy
Assignee: RTX Corp
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Filing: 1978-09-05
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Granted: 1980-10-07
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Expires: 1998-09-05
Abstract
Abstract A series of superalloy compositions are described, which when processed according to a described processing sequence, produce homogeneous superalloy articles which contain an exceptionally high amount of the gamma prime phase. These alloys contain large amounts of aluminum and chromium and hence are quite oxidation resistant. The processing sequence includes rapid solidification to suppress the formation of the low melting eutectic phases which would otherwise occur.
Inventors
- 👤 Arthur R. Cox
- 👤 Romeo G. Bourdeau
- 👤 Paul R. Holiday
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 22:29
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/04; C22C1/0433
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
140 words
A method of fabricating an oxidation resistant nickel superalloy article including the steps of: a. providing an alloy consisting of 7-12% Al, 0-5% Ti, 7-15% Cr, 0-6% Ta, 0-6% Cb, 0-12% W, 0-10% Mo, 0-5% Hf, 0-0.5% C, 0-0.1% B, 0-0.1% Zr, 0-0.5% Y, balance nickel; b. melting the alloy; c. solidifying the alloy into particulate form at a rate in excess of 10 4 ° F./sec. which is sufficient to suppress the formation of low melting eutectic phases; and d. compacting the solidified particulate form an article; and whereby the incipient melting temperature of the alloys and the elevated temperature mechanical properties of the alloy are increased and so that a more uniform distribution of elements throughout the alloy as obtained resulting in an increased volume fraction of the gamma prime phase being present and in improved oxidation resistance.
Claim 2
Independent Claim
140 words
A method of fabricating an oxidation resistant nickel superalloy article including the steps of: a. providing an alloy consisting of 7-12% Al, 0-5% Ti, 7-15% Cr, 0-6% Ta, 0-6% Cb, 0-12% W, 0-10% Mo, 0-5% Hf, 0-0.5% C, 0-0.1% B, 0-0.1% Zr, 0-0.5% Y, balance nickel; b. melting the alloy; c. solidifying the alloy into particulate form at a rate in excess of 10 4 ° F./sec. which is sufficient to suppress the formation of low melting eutectic phases; and d. compacting the solidified particulate form an article; and whereby the incipient melting temperature of the alloys and the elevated temperature mechanical properties of the alloy are increased and so that a more uniform distribution of elements throughout the alloy as obtained resulting in an increased volume fraction of the gamma prime phase being present and in improved oxidation resistance.
Claim 3
Dependent Claim
62 words
A method as in claim 1 wherein the article formed in heat treated near, but below the gamma prime solvus temperature to cause the formation of gamma prime particles at grain boundaries and is then passed through a thermal gradient whose hot end is greater than the gamma prime solvus temperature, but less than the incipient melting temperature to form elongated grains.
Claim 4
Dependent Claim
67 words
A method as in claim 2 wherein after the passage of the article through the thermal gradient, the article is reheated to a temperature in excess of the gamma prime solvus temperature, but below the incipient melting temperature, to dissolve substantially all of the gamma prime, and is then held at a temperature below the gamma prime temperature to cause controlled reprecipitation of the gamma prime phase.
Claim 5
Dependent Claim
38 words
A method as in claim 1 wherein the alloy consists essentially of 7-10% Al, 0-2% Ti, 8-12% Cr, 0-6% Ta, 0-6% Cb, 0-12% W, 0-10% Mo, 0-3% Hf, 0-0.5% C, 0-0.1% B, 0-1% Zr, 0-0.5% Y, balance nickel.
Claim 6
Dependent Claim
14 words
A method as in claim 2 wherein the sum of Ta+Cb+W+Mo+Hf is about 2-18%.
Claim 7
Dependent Claim
14 words
A method as in claim 2 wherein the sum of Ta+Cb+W+Mo+Hf is about 5-15%.
Claim 8
Dependent Claim
10 words
The product made according to the method of claim 1.
Claim 9
Dependent Claim
10 words
The product made according to the method of claim 2.
Claim 10
Dependent Claim
10 words
The product made according to the method of claim 3.
Claim 11
Dependent Claim
10 words
The product made according to the method of claim 4.
References Cited (Backward Citations)
US3832167A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-10-07 | 1984-04-07 | 1984-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-07 | 1988-04-07 | 1988-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-07 | 1992-04-07 | 1992-10-07 | $7700.00 | Window Closed / Lapsed |