US3649256A
Expired / Lapsed
US
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Fully dense consolidated-powder superalloys
Assignee: Latrobe Steel Co
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Filing: 1970-02-16
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Granted: 1972-03-14
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Expires: 1990-02-16
Abstract
Abstract Superalloys formed of consolidated powder, which are fully dense and have a composition by weight consisting essentially of about 0.70 to 1.2 percent carbon, about 18 to 24 percent chromium, about 7 to 12 percent tungsten, about 3 to 11 percent tantalum, about 0.05 to 2.5 percent zirconium, and the balance cobalt together with minor alloying ingredients and incidental impurities, are characterized by being readily workable as compared to conventional casting alloys of the same chemical composition which are too brittle and have too little ductility to hot work.
Inventors
- 👤 Stewart G Fletcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:49
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/07; Y; Y10; Y10S; Y10S75/00; Y10S75/95
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
29 words
An alloy having the composition of the alloy of claim 1, prepared by consolidation of a powder in which the dendrite arm spacing is less than about 0.0003 inch.
Claim 2
Dependent Claim
70 words
An alloy according to claim 1, consisting essentially of: carbon about 0.9 to 1.1 percent chromium about 20 to 23 percent tungsten about 8 to 10 percent tantalum about 4 to 5 percent zirconiUm about 2 to 2.5 percent titanium about 0.65 to 0.85 percent silicon about 0.20 percent maximum manganese about 0.20 percent maximum iron about 1.5 percent maximum and the balance cobalt with usual impurities in ordinary amounts.
Claim 3
Dependent Claim
50 words
A fully dense consolidated-powder alloy consisting essentially of: carbon about 1.0 percent chromium about 21.5 percent tungsten about 9 percent tantalum about 4.5 percent zirconium about 2.0 percent titanium about 0.75 percent and the balance cobalt with usual impurities in ordinary amounts, said alloy being characterized by being hot workable.
Claim 4
Dependent Claim
69 words
An alloy according to claim 1, consisting essentially of: carbon about 0.78 to 0.93 percent chromium about 20 to 23 percent tungsten about 9 to 11 percent tantalum about 8 to 10 percent zirconium about 0.1 to 0.3 percent silicon about 0.4 percent maximum manganese about 0.2 percent maximum iron about 1.5 percent maximum boron about 0.01 percent maximum and the balance cobalt with usual impurities in ordinary amounts.
Claim 5
Dependent Claim
50 words
A fully dense consolidated-powder alloy, consisting essentially of: carbon about 0.85 percent chromium about 21.5 percent tungsten about 10 percent tantalum about 9 percent zirconium about 0.2 percent boron about 0.005 percent and the balance cobalt with usual impurities in ordinary amounts, said alloy being characterized by being hot workable.
References Cited (Backward Citations)
US3527744A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-14 | 1975-09-13 | 1976-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-14 | 1979-09-13 | 1980-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-14 | 1983-09-13 | 1984-03-14 | $7700.00 | Window Closed / Lapsed |