US3920489A
Expired / Lapsed
US
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Method of making superalloy bodies
Assignee: General Electric Co
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Filing: 1974-05-28
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Granted: 1975-11-18
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Expires: 1994-05-28
Abstract
Abstract A method of making superalloy bodies characterized by having aligned elongated grains is provided by employing powder metallurgy procedures. The method involves hot compacting a nickel-base superalloy to a dense solid, heat treating the solid to form an essentially single phase gamma structure, imparting a critical strain to the single phase material and then subjecting the material to a unidirectional recrystallization step to form an elongated columnar grained structure having grain boundaries substantially parallel to the direction of recrystallization.
Inventors
- 👤 Edward R Buchanan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:23
CPC Classifications
H; H10; H10D; H10D62/00; H10D62/40; H10D62/405; B; B22; B22F; B22F3/00; B22F3/24; H10D99/00; H10P; H10P14/00; H10P14/20; H10P14/29; H10P14/2901; H10P14/2902; H10P14/2905; H10P14/2926; H10P14/34; H10P14/3402; H10P14/3404; H10P14/3411; H10P95/00; Y; Y10; Y10S; Y10S117/00; Y10S117/901; Y10S117/902; Y10S148/00; Y10S148/049; Y10S148/097; Y10S148/115; Y10S148/118; Y10S438/00; Y10S438/973
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
143 words
AN ARTICLE OF MANUFACTURE HAING A CHEMICALLY INERT PHASE DISPERSED THEREIN COMPRISING A UNIDIRECTIONALLY RECRYSTALLIZED NICKEL-BASE SUPERALLOY BODY FREE OF EUTECTIC MODULE INHOMOGENIETIES HAVING AN ALIGNED ELONGATED GRAIN OR MONOCRYSTALLINE STRUCTURE AND CONTAINING UP TO 10 PERCENT BY VOLUME OF CHEMICALLY CHAMICALLY INERT PHASE DISPERSED THEREIN WHERIN SAID NICKEL-BASE SUPERALLOY BODY IS PREPAREED BY A METHOD COMPRISING THE STEPS OF: A. HOT COMPACTING A NICKEL-BASE SUPERALLOY POWDER TO FROM A RELATIVELY DENSE SOLID CONSISTING ESSENTAILLY OF A Y'' PRECIPITATE PHASE WITH A Y'' MATRIX. B. SOLUTION HEAT TREATING THE DENSE SOLID AT A TEMPERATURE BELOW THE INCIPIENT MELTING POINT AND HIGH ENOUGH TO DISSOLVE A SUBSTANTIAL PORTION OF THE Y'' PHASE. C. SUBJECTING THE MATERIAL TO A SUFFICIENT STRAIN BELOW THE RECRYSTALLIZATION TEMPERATURE TO PERMIT SUBSEQUENT RECRYSTALLIZATION, AND D. UNIDIRECTIONALLY RECRYSTALLIZATION THE STRAINED MATERIAL IN A TEMPERATURE GRADIENT BELOW THE INCIPIENT MELTING TEMPER-
Claim 2
Dependent Claim
143 words
AN ARTICLE OF MANUFACTURE HAING A CHEMICALLY INERT PHASE DISPERSED THEREIN COMPRISING A UNIDIRECTIONALLY RECRYSTALLIZED NICKEL-BASE SUPERALLOY BODY FREE OF EUTECTIC MODULE INHOMOGENIETIES HAVING AN ALIGNED ELONGATED GRAIN OR MONOCRYSTALLINE STRUCTURE AND CONTAINING UP TO 10 PERCENT BY VOLUME OF CHEMICALLY CHAMICALLY INERT PHASE DISPERSED THEREIN WHERIN SAID NICKEL-BASE SUPERALLOY BODY IS PREPAREED BY A METHOD COMPRISING THE STEPS OF: A. HOT COMPACTING A NICKEL-BASE SUPERALLOY POWDER TO FROM A RELATIVELY DENSE SOLID CONSISTING ESSENTAILLY OF A Y'' PRECIPITATE PHASE WITH A Y'' MATRIX. B. SOLUTION HEAT TREATING THE DENSE SOLID AT A TEMPERATURE BELOW THE INCIPIENT MELTING POINT AND HIGH ENOUGH TO DISSOLVE A SUBSTANTIAL PORTION OF THE Y'' PHASE. C. SUBJECTING THE MATERIAL TO A SUFFICIENT STRAIN BELOW THE RECRYSTALLIZATION TEMPERATURE TO PERMIT SUBSEQUENT RECRYSTALLIZATION, AND D. UNIDIRECTIONALLY RECRYSTALLIZATION THE STRAINED MATERIAL IN A TEMPERATURE GRADIENT BELOW THE INCIPIENT MELTING TEMPER-
Claim 3
Dependent Claim
20 words
The article of claim 1, wherein the strain is equivalent to an elongation at room temperature of about 1-3 percent.
Claim 4
Dependent Claim
21 words
The article of claim 1, wherein the strain is equivalent to an elongation at a temperature of 1200-1400*F. of 8-10 percent.
Claim 5
Dependent Claim
30 words
The article of claim 1, wherein the nickel-base superalloy powder is compacted by canning in a steel jacket under vacuum to form a billet and the billet is hot extruded.
Claim 6
Dependent Claim
12 words
The article of claim 1, wherein said chemically inert phase ia alumina.
Claim 7
Dependent Claim
11 words
The article of claim 1, wherein said inert phase is yttria.
Claim 8
Dependent Claim
15 words
The article of claim 1, wherein said alloy consists essentially in weight percent of about:
Claim 9
Dependent Claim
44 words
The article of claim 4, wherein the strained material is unidirectionally recrystallized by drawing the material through a gradient furnace having a temperature gradient of at least 1000*F. per inch and the material is drawn at a rate of about 0.5-2 inches per hour.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |