US3645803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for improving the fracture toughness of metals and alloys
Assignee: United States Department of the Navy
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Filing: 1970-04-16
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Granted: 1972-02-29
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Expires: 1990-04-16
Abstract
Abstract This invention is directed to a method of improving the fracture toughness of titanium alloys by bonding a high-strength alloy of normally low toughness onto a lower strength alloy of high fracture toughness with subsequent heat treatment of the combination if desired or required.
Inventors
- 👤 Ralph W Huber
- 👤 William S Pellini
- 👤 Robert J Goode
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 16:10
CPC Classifications
C; C22; C22F; C22F1/00; B; B32; B32B; B32B15/00; B32B15/01; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/9335; Y10S428/94; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12986
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A method as claimed in claim 1; wherein, said composite structure is solution annealed in a vacuum at a temperature near the Beta transus for 1 hour followed by water quenching and aging at about 1,200* F. for 2 hours.
Claim 2
Dependent Claim
18 words
A method as claimed in claim 2; wherein, said bonding is carried out by an explosive bonding method.
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |