Patent US3677331A successfully refreshed from Google Patents.
US3677331A
Expired / Lapsed
US
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Casting process for nickel base alloys
Assignee: Lockheed Martin Corp
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Filing: 1969-07-14
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Granted: 1972-07-18
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Expires: 1989-07-14
Abstract
Abstract A casting process and castings produced thereby wherein a nickel-base, chrominum containing alloy which also contains sufficient amounts of aluminum and titanium to produce eutectic gamma-prime phase in the alloy as cast is caused to contain about 0.5 percent to about 5 percent hafnium, is cast into final configuration and is cooled from the molten state rapidly through the range of 2,200* to 1,850* F. to maximize creep characteristics at 1,800* F. while at the same time providing castings which are thermally conditioned to exhibit good mechanical characteristics, especially prior creep at 1,400* F.
Inventors
- 👤 Carl H Lund
- 👤 John Hockin
- 👤 Michael J Woulds
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:19
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/03; C22C19/05; C22C19/051; C22C19/056; B; B22; B22D; B22D27/00; B22D27/04; B22D27/045
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
14 words
A process as in claim 1 wherein the casting is conducted under high vacuum.
Claim 2
Dependent Claim
116 words
A process as in claim 1 wherein the alloy in addition to hafnium contains in percent by weight about 0.2 percent to about 0.5 percent carbon, about 7 percent to about 15 percent chromium, up to about 35 percent cobalt, up to about 14 tungsten, up to about 8 percent molybdenum, about 0.5 percent to about 6 percent titanium, about 4 percent to about 7 percent aluminum, about 6.5 percent to about 10.5 percent aluminum plus titanium, up to about 0.3 percent boron, up to about 0.5 percent zirconium, up to about 3 percent columbium, up to about 1.5 percent vanadium, with the balance being essentially nickel in an amount of at least about 36 percent.
Claim 3
Dependent Claim
150 words
A process as in claim 3 wherein the alloy cast is an alloy selected from the group of alloys A to F modified to contain about 0.5 percent to about 5 percent by weight of hafnium in place of an equal percent by weight of nickel Percent by Weight Alloy A B C D E F C 0.16 0.10 0.15 0.12 .18 0.05 Cr 9.0 8.0 9.0 12.5 10.0 12.0 Co 10.0 10.0 10.0 -15.0 -W 10.0 - 12.5 - - -Mo 2.5 6.0 - 4.2 3.0 4.5 Ta 1.5 4.25 - - - -Ti 1.5 1.0 2.0 0.8 t 4.7 0.6 Al 5.5 6.0 5.0 6.1 5.5 5.9 B 0.015 0.015 0.015 0.012 0.014 0.01 Zr 0.05 0.10 0.05 0.10 0.06 0.10 Cb - - 1.0 2.0 -2.0 V - - - - 1.0 -Ni Bal. Bal. Bal. Bal. Bal. Bal and said alloy is cast under high vacuum.
Claim 4
Dependent Claim
17 words
A process as in claim 4 wherein the mold has the configuration of a gas turbine structure.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |