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US3620855A
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Superalloys incorporating precipitated topologically close-packed phases
Assignee: RTX Corp
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Filing: 1969-09-26
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Granted: 1971-11-16
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Expires: 1989-09-26
Abstract
Abstract The nickel-base and cobalt-base superalloys are formed to provide, in addition to the usual strengthening mechanisms, additional strengthening and other property improvements through the precipitation of copious quantities of the topologically close-packed phases, such as the sigma phase.
Inventors
- 👤 David H Wagner
- 👤 David N Duhl
- 👤 Edward H Van Der Molen
- 👤 Cornelius P Sullivan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:40
CPC Classifications
C; C22; C22C; C22C19/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
43 words
A nickel-base superalloy article characterized by high strength and hardness at high temperature which consists essentially of a nickel-base alloy matrix of high melting point, a gamma '' phase uniformly dispersed therein, and a dispersed topologically close-packed phase in a substantially equiaxed morphology.
Claim 2
Dependent Claim
30 words
An article according to claim 2 wherein the alloy microstructure is characterized by a polygonal substructure consisting of dislocations aligned as subcell boundaries to provide a regular array of defects.
Claim 3
Dependent Claim
16 words
An article according to claim 2 wherein the alloy microstructure comprises a randomly nonoriented dislocation distribution.
Claim 4
Dependent Claim
34 words
An article according to claim 2 wherein the allow contains, by weight, 10-25 percent chromium, 10-25 percent cobalt, 0-7 percent molybdenum, 1.5-7 percent titanium, 1.5-7 percent aluminum, 0.01-0.5 percent carbon, and 0.003-0.02 percent boron.
Claim 5
Dependent Claim
34 words
An article according to claim 5 wherein the alloy contains, by weight, 16-17 percent chromium, 16-18 percent cobalt, 5-6 percent molybdenum, 4-5 percent titanium, 4.5-5.5 percent aluminum, 0.01-0.08 percent carbon, and 0.004-0.01 percent boron.
Claim 6
Dependent Claim
52 words
A cobalt base superalloy article characterized by high strength and hardness at high temperature which consists essentially of 20-30 percent chromium, 5-20 percent nickel, 10-20 percent tungsten or molybdenum, 0-15 percent tantalum, 0-1 percent silicon, and 0.05-1 percent carbon have a dispersed topologically close-packed phase precipitated therein in a substantially equiaxed morphology.
Claim 7
Dependent Claim
34 words
An article according to claim 7 wherein the alloy contains, by weight, 23-27 percent chromium, 8-12 percent nickel, 13-17 percent tungsten, molybdenum or tantalum, 0.25-0.75 percent silicon, 0.05-0.1 percent carbon and 1-2 percent manganese.
References Cited (Backward Citations)
US3147155A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-15 | 1975-05-17 | 1975-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-15 | 1979-05-17 | 1979-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-15 | 1983-05-17 | 1983-11-16 | $7700.00 | Window Closed / Lapsed |