US4134758A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Titanium alloy with high internal friction and method of heat-treating the same
Assignee: Kobe Steel Ltd
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Filing: 1977-04-26
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Granted: 1979-01-16
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Expires: 1997-04-26
Abstract
Abstract A titanium alloy having a high degree of internal friction and suitable for rotating blades of turbomachines is composed of 5.5 - 6.75% Al, 1 - 5% V, 1 - 5% Mo, V plus Mo being greater than or equal to 5%, and the balance Ti and usual impurities, all by weight. A method of heat-treating the alloy comprises maintaining the same at a temperature not lower than 125° C below its β transformation point for a predetermined period of time and then rapidly cooling the alloy.
Inventors
- 👤 Nobuyuki Nagai
- 👤 Yasuo Moriguchi
- 👤 Yoshimasa Itoh
- 👤 Shoji Ueda
- 👤 Yorimasa Takeda
- 👤 Akira Hiromoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 17:29
CPC Classifications
C; C22; C22C; C22C14/00
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
76 words
A heat-treated titanium alloy with a high internal friction suitable for rotating blades of turbomachines and consisting essentially of, by weight, 5.5-6.75% Al, 1-5% V, 1-5% Mo, V plus Mo being greater than 6%, and the balance being Ti, the alloy having been solution heat treated at a temperature not lower than 125° C. below the β transformation point of the alloy, the alloy having a minimum damping capacity of about 5 × 10 -3 .
Claim 2
Dependent Claim
76 words
A heat-treated titanium alloy with a high internal friction suitable for rotating blades of turbomachines and consisting essentially of, by weight, 5.5-6.75% Al, 1-5% V, 1-5% Mo, V plus Mo being greater than 6%, and the balance being Ti, the alloy having been solution heat treated at a temperature not lower than 125° C. below the β transformation point of the alloy, the alloy having a minimum damping capacity of about 5 × 10 -3 .
Claim 3
Independent Claim
94 words
A method of solution heat-treating a titanium alloy with a high internal friction suitable for rotating blades of turbomachines, which comprises heating and maintaining a titanium alloy consisting essentially of, by weight, 5.5-6.75% Al, 1-5% V, 1-5% Mo, V plus Mo being greater than 6%, and the balance being Ti at a temperature not lower than 125° C. below the β transformation point of the alloy for a predetermined period of time, and then rapidly cooling the same to produce an alloy having a minimum damping capacity of about 5 × 10 -3 .
Claim 4
Independent Claim
94 words
A method of solution heat-treating a titanium alloy with a high internal friction suitable for rotating blades of turbomachines, which comprises heating and maintaining a titanium alloy consisting essentially of, by weight, 5.5-6.75% Al, 1-5% V, 1-5% Mo, V plus Mo being greater than 6%, and the balance being Ti at a temperature not lower than 125° C. below the β transformation point of the alloy for a predetermined period of time, and then rapidly cooling the same to produce an alloy having a minimum damping capacity of about 5 × 10 -3 .
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) | 1982-01-15 | 1982-07-17 | 1983-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-01-15 | 1986-07-17 | 1987-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-01-15 | 1990-07-17 | 1991-01-16 | $7700.00 | Window Closed / Lapsed |