US3980468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a ductile rare-earth containing superalloy
Assignee: Haynes International Inc
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Filing: 1973-11-01
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Granted: 1976-09-14
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Expires: 1993-11-01
Abstract
Abstract A method is provided for producing ductile superalloys containing rare-earth metals, lanthanum and yttrium by melting the desired alloy composition by conventional melt practices, adding the rare-earth metals, lanthanum or yttrium to the molten composition, forming the alloy composition into solid electrodes, remelting the solid electrode by electroslag remelting techniques and casting the remelted alloy.
Inventors
- 👤 Barry H. Rosof
- 👤 H. Joseph Klein
- 👤 Dennis S. Acuncius
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:30
CPC Classifications
C; C22; C22B; C22B9/00; C22B9/16; C22B9/18; C22C; C22C1/00; C22C1/02
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
63 words
The method of producing rare-earth containing super-alloys having as their major components nickel, cobalt and chromium in combination characterized by enhanced ductility and substantial freedom from brittleness comprising: a. melting the desired super alloy composition; b. adding the desired rare-earth alloy to the molten alloy composition; c. forming the alloy composition into solid electrodes; and d. remelting said solid electrodes by electroslag remelting.
Claim 2
Independent Claim
63 words
The method of producing rare-earth containing super-alloys having as their major components nickel, cobalt and chromium in combination characterized by enhanced ductility and substantial freedom from brittleness comprising: a. melting the desired super alloy composition; b. adding the desired rare-earth alloy to the molten alloy composition; c. forming the alloy composition into solid electrodes; and d. remelting said solid electrodes by electroslag remelting.
Claim 3
Dependent Claim
20 words
The method as claimed in claim 1 using a substantially pure calcium fluoride slag in step (d) of claim 1.
Claim 4
Dependent Claim
30 words
The method as claimed in claim 1 using a slag of about 70% CaF 2 , 15% CaO and 15% Al 2 O 3 in step (d) of claim 1.
Claim 5
Dependent Claim
25 words
The method as claimed in claim 1 where the superalloy composition is first melted and the rare earth added as a master alloy with nickel.
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) | 1979-09-14 | 1980-03-15 | 1980-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-14 | 1984-03-15 | 1984-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-14 | 1988-03-15 | 1988-09-14 | $7700.00 | Window Closed / Lapsed |