US4482398A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for refining microstructures of cast titanium articles
Assignee: United States Department of the Air Force
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Filing: 1984-01-27
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Granted: 1984-11-13
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Expires: 2004-01-27
Abstract
Abstract The microstructure of titanium alloy castings is improved by a process which comprises beta-solution heat treating the cast article at or near the beta-transus temperature of the alloy, cooling the article to room temperature at a rate in excess of air cooling and aging the article at a temperature about 0.8 to 0.9 of the beta-transus.
Inventors
- 👤 Daniel Eylon
- 👤 Francis H. Froes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:44
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/16; C22F1/18; C22F1/183
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
90 words
A process for improving the microstructure of a cast titanium article which comprises the steps of: a. providing a cast titanium article; b. beta-solution heat treating said cast article at a temperature approximately equal to the beta-transus temperature of said article; c. cooling said article at a rate in excess of air cooling to room temperature; d. aging said article at a temperature in the approximate range of 0.80 to 0.90 times said beta-transus temperature for about 4 to 36 hours; and e. air cooling said article to room temperature.
Claim 2
Dependent Claim
90 words
A process for improving the microstructure of a cast titanium article which comprises the steps of: a. providing a cast titanium article; b. beta-solution heat treating said cast article at a temperature approximately equal to the beta-transus temperature of said article; c. cooling said article at a rate in excess of air cooling to room temperature; d. aging said article at a temperature in the approximate range of 0.80 to 0.90 times said beta-transus temperature for about 4 to 36 hours; and e. air cooling said article to room temperature.
Claim 3
Dependent Claim
34 words
The process of claim 1 wherein said beta-solution heat treatment is carried out at a temperature ranging from about 3% below to about 10% above said beta-transus temperature for about 10 to 240 minutes.
Claim 4
Dependent Claim
33 words
The process of claim 1 wherein said beta-solution treatment is carried out at a temperature in the approximate range of 0 to 3% above said beta-transus temperature for about 10 to 240 minutes.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein said cast article is cast from an alpha-beta titanium alloy.
Claim 6
Dependent Claim
10 words
The process of claim 4 wherein said alloy is Ti-6Al-4V.
Claim 7
Dependent Claim
16 words
The process of claim 1 wherein said cast article is cast from a near-alpha titanium alloy.
Claim 8
Dependent Claim
23 words
The process of claim 1 further comprising the step of hot isostatic pressing said cast article prior to said beta-solution heat treating step.
Claim 9
Dependent Claim
48 words
The process of claim 7 wherein said hot isostatic pressing is carried out by heating said article to a temperature in the approximate range of 5 to 10% below said beta-transus temperature at a pressure in the approximate range of 10-15 Ksi for about 2 to 4 hours.
Claim 10
Dependent Claim
84 words
An article of manufacture comprising a component cast from a titanium alloy, subjected to beta-solution heat treatment by heating said cast component to a temperature approximately equal to the beta-transus temperature of said alloy and cooling said component at a rate in excess of air cooling to room temperature, and aged by heating said component to a temperature in the approximate range of 0.80 to 0.90 of said beta-transus temperature for about 4 to 36 hours and air cooling said component to room temperature.
Claim 11
Dependent Claim
84 words
An article of manufacture comprising a component cast from a titanium alloy, subjected to beta-solution heat treatment by heating said cast component to a temperature approximately equal to the beta-transus temperature of said alloy and cooling said component at a rate in excess of air cooling to room temperature, and aged by heating said component to a temperature in the approximate range of 0.80 to 0.90 of said beta-transus temperature for about 4 to 36 hours and air cooling said component to room temperature.
Claim 12
Dependent Claim
15 words
The article of manufacture of claim 9 wherein said component is an aircraft brake drum.
Claim 13
Dependent Claim
23 words
An article of manufacture in accordance with claim 9 which further is subjected to hot isostatic pressing prior to said beta-solution heat treatment.
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) | 1987-11-13 | 1988-05-14 | 1988-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-13 | 1992-05-14 | 1992-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-13 | 1996-05-14 | 1996-11-13 | $7700.00 | Window Closed / Lapsed |