US4534808A
Expired / Lapsed
US
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Method for refining microstructures of prealloyed powder metallurgy titanium articles
Assignee: United States, UNITED STATES AIR FORCE, Secretary of
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Filing: 1984-06-05
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Granted: 1985-08-13
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Expires: 2004-06-05
Abstract
Abstract A method for improving the microstructure of an article made by powder metallurgy of prealloyed titanium powder which comprises beta-solution heat treating the article at a temperature approximately equal to the beta-transus of the equivalent alloy, rapidly cooling the article, annealing the article at a temperature about 10 to 20% below the beta-transus and air cooling to room temperature. The resulting article has a fine alpha plate structure in a matrix of discontinuous beta phase.
Inventors
- 👤 Daniel Eylon
- 👤 Francis H. Froes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:53
CPC Classifications
B; B22; B22F; B22F3/00; B22F3/10; B22F3/1017; B22F3/1028
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
91 words
A method for improving the microstructure of an article made by powder metallurgy of prealloyed titanium powder which comprises, in combination, the steps of: a. beta-solution heat treating said article at a temperature approximately equal to the beta-transus temperature of said alloy; b. cooling said article at a rate in excess of air cooling to room temperature; c. annealing said article at a temperature in the approximate range of 10 to 20% below said beta-transus temperature for about 4 to 36 hours; and, d. air cooling said article to room temperature.
Claim 2
Independent Claim
91 words
A method for improving the microstructure of an article made by powder metallurgy of prealloyed titanium powder which comprises, in combination, the steps of: a. beta-solution heat treating said article at a temperature approximately equal to the beta-transus temperature of said alloy; b. cooling said article at a rate in excess of air cooling to room temperature; c. annealing said article at a temperature in the approximate range of 10 to 20% below said beta-transus temperature for about 4 to 36 hours; and, d. air cooling said article to room temperature.
Claim 3
Dependent Claim
34 words
The method of claim 1 wherein said beta-solution heat treatment is carried out at a temperature ranging from about 5% below to about 10% above said beta-transus temperature for about 10 to 240 minutes.
Claim 4
Dependent Claim
34 words
The method of claim 1 wherein said beta-solution heat treatment is carried out at a temperature in the approximate range of 0 to 5% above said beta-transus temperature for about 10 to 240 minutes.
Claim 5
Dependent Claim
14 words
The method of claim 1 wherein said prealloyed powder is an alpha+beta titanium alloy.
Claim 6
Dependent Claim
10 words
The method of claim 4 wherein said alloy is Ti-6Al-4V.
Claim 7
Dependent Claim
14 words
The method of claim 1 wherein said prealloyed powder is a near-alpha titanium alloy.
Claim 8
Dependent Claim
30 words
An article of manufacture comprising a component made by powder metallurgy of a prealloyed titanium alloy powder, said article having a fine alpha plate microstructure with a discontinuous beta phase.
Claim 9
Dependent Claim
30 words
An article of manufacture comprising a component made by powder metallurgy of a prealloyed titanium alloy powder, said article having a fine alpha plate microstructure with a discontinuous beta phase.
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) | 1988-08-12 | 1989-02-11 | 1989-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-12 | 1993-02-11 | 1993-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-12 | 1997-02-11 | 1997-08-13 | $7700.00 | Window Closed / Lapsed |