US4714587A
Expired / Lapsed
US
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Method for producing very fine microstructures in titanium alloy powder compacts
Assignee: United States Department of the Air Force
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Filing: 1987-02-11
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Granted: 1987-12-22
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Expires: 2007-02-11
Abstract
Abstract A process for producing titanium alloy articles by Hot Isostatic Pressing of a rapidly-solidified titanium alloy powder is provided wherein such pressing is carried out at a pressure greater than 30 ksi, and a temperature of about 60 to 80 percent of the beta-transus temperature of the alloy, in degrees C. Hot Isostatic Pressing under these conditions allows retention of the fine microstructure of the rapidly-solidified powder. The compacted article may be subjected to heat treatment to alter its microstructure.
Inventors
- 👤 Daniel Eylon
- 👤 Francis H. Froes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:40
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/02
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
71 words
A process for producing titanium alloy articles having a desired microstructure which comprises the steps of: (a) providing a prealloyed titanium powder; (b) filling a suitable mold with said powder; and (c) consolidating the powder in the filled mold at a pressure of at least 30 ksi and a temperature about 60 to 80 percent of the beta transus temperature of said alloy, in degrees-C., for about 4 to 48 hours.
Claim 2
Dependent Claim
71 words
A process for producing titanium alloy articles having a desired microstructure which comprises the steps of: (a) providing a prealloyed titanium powder; (b) filling a suitable mold with said powder; and (c) consolidating the powder in the filled mold at a pressure of at least 30 ksi and a temperature about 60 to 80 percent of the beta transus temperature of said alloy, in degrees-C., for about 4 to 48 hours.
Claim 3
Dependent Claim
20 words
The process of claim 1 further comprising the step of: (d) annealing the resulting consolidated article to alter its microstructure.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein said providing step (a) comprises subjecting said powder to a strain energing process prior to said step (b).
Claim 5
Dependent Claim
13 words
The process of claim 1 wherein said pressure is at least 35 ksi.
Claim 6
Dependent Claim
22 words
The process of claim 1 further comprising the step of: (d) beta-solution heat treating the resulting consolidated article to alter its microstructure.
Claim 7
Dependent Claim
26 words
The process of claim 1 further comprising the steps of: (d) beta-solution heat treating the resulting consolidated article; and (e) annealing the heat treated, consolidated article.
Claim 8
Dependent Claim
26 words
The process of claim 1 wherein said alloy is Ti-6Al-4V, and wherein said consolidation is carried out at 650° C. at 45 ksi for 24 hours.
Claim 9
Dependent Claim
27 words
The process of claim 7 further comprising the step of annealing the thus-consolidated article at 815° C. for 24 hours followed by air cooling to room temperature.
Claim 10
Dependent Claim
25 words
The process of claim 3 wherein said alloy is Ti-6Al-4V, and wherein consolidation is carried about at 595° C. at 45 ksi for 24 hours.
Claim 11
Dependent Claim
27 words
The process of claim 9 further comprising the step of annealing the thus-consolidated article at 705° C. for 24 hours followed by furnace cooling to room temperature.
Claim 12
Dependent Claim
27 words
The process of claim 9 further comprising the step of annealing the thus-compacted article at 815° C. for 24 hours followed by furnace cooling to room temperature.
Claim 13
Dependent Claim
24 words
The process of claim 9 further comprising the step of annealing the thus-consolidated article at 815° C. for 24 hours followed by furnace cooling.
Claim 14
Dependent Claim
24 words
The process of claim 9 further comprising the step of heating the thus-consolidated article at 955° C. for 2 hours followed by furnace cooling.
Claim 15
Dependent Claim
22 words
The process of claim 1 wherein said alloy is Ti-10V-2Fe-3Al and wherein consolidation is carried out at 505° C. for 24 hours.
Claim 16
Dependent Claim
40 words
The process of claim 14 further comprising the steps of heat treating the thus-consolidated article at 760° C. for one hour followed by water quench, and heating the thus-heat-treated article at 510° C. for 8 hours followed by air cooling.
Claim 17
Dependent Claim
39 words
The process of claim 14 further comprising th steps of heat-treating the thus-consolidated article at 790° C. for 3 hours followed by air cooling, and heating the thus-heat-treated article at 370° C. for 4 hours followed by air cooling.
Claim 18
Dependent Claim
25 words
The process of claim 3 wherein said alloy is Ti-10V-2Fe-3Al and wherein consolidation is carried out at 540° C. at 45 ksi for 24 hours.
Claim 19
Dependent Claim
40 words
The process of claim 17 further comprising the steps of heat treating the thus-consolidated article at 750° C. for one hour followed by water quench, and heating the thus-heat-treated article at 550° C. for 8 hours followed by air cooling.
References Cited (Backward Citations)
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Cited
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-12-21 | 1991-06-22 | 1991-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-12-21 | 1995-06-22 | 1995-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-12-21 | 1999-06-22 | 1999-12-22 | $7700.00 | Window Closed / Lapsed |