US4543235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eutectic superalloy compositions and articles
Assignee: United States Department of the Navy
•
Filing: 1982-09-22
•
Granted: 1985-09-24
•
Expires: 2002-09-22
Abstract
Abstract An improved eutectic superalloy composition is described. The eutectic composition upon solidification forms a gamma matrix, containing a substantial quantity of particles of the gamma prime phase, and containing about 12% by volume of aligned continuous chromium carbide fibers (Cr3C2). Material of this composition is provided with significantly improved mechanical properties and surface stability through the addition of approximately one atomic percent of the material selected from the group consisting of manganese, technetium and rhenium. Directionally solidified articles of this composition have utility as gas turbine engine components.
Inventors
- 👤 Franklin D. Lemkey
- 👤 Irving Machlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:06
CPC Classifications
C; C30; C30B; C30B21/00; C30B21/02; C30B29/00; C30B29/10; C30B29/52
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
69 words
In a eutectic superalloy composition, intended for use in directionally solidified form, consisting essentially of 6.7-7.1 weight percent aluminum, 11.8-12.8 weight percent chromium, 0-1 weight percent yttrium, about 1.5% carbon, balance nickel, the improvement which comprises: adding from about 0.7 to about 1.4 atomic percent of an element selected from the group consisting of manganese, technetium and rhenium, and mixtures thereof, whereby improved surface stability and mechanical properties result.
Claim 2
Dependent Claim
69 words
In a eutectic superalloy composition, intended for use in directionally solidified form, consisting essentially of 6.7-7.1 weight percent aluminum, 11.8-12.8 weight percent chromium, 0-1 weight percent yttrium, about 1.5% carbon, balance nickel, the improvement which comprises: adding from about 0.7 to about 1.4 atomic percent of an element selected from the group consisting of manganese, technetium and rhenium, and mixtures thereof, whereby improved surface stability and mechanical properties result.
Claim 3
Dependent Claim
38 words
A composition as in claim 1 in which the yttrium content is replaced in whole or in part by a material selected from the group consisting of scandium, lanthanum, the lanthanide elements and Misch metal, and mixtures thereof.
Claim 4
Dependent Claim
93 words
A directionally solidified gas turbine engine component having a microstructure consisting of a continuous gamma (nickel solid solution) phase containing more than 40% of discontinuous gamma prime phase (Ni 3 X, where X is predominantly Al) and said matrix further containing about 12 volume percent of continuous fibers having a nominal Cr 3 C 2 composition, said component having a nominal composition of 6.9% aluminum, 12.2% chromium, 1.5% carbon, 0.2-0.7% yttrium, 0.7-1.4 atomic percent of an element selected from the group consisting of manganese, technetium and rhenium, and mixtures thereof, balance essentially nickel.
Claim 5
Dependent Claim
93 words
A directionally solidified gas turbine engine component having a microstructure consisting of a continuous gamma (nickel solid solution) phase containing more than 40% of discontinuous gamma prime phase (Ni 3 X, where X is predominantly Al) and said matrix further containing about 12 volume percent of continuous fibers having a nominal Cr 3 C 2 composition, said component having a nominal composition of 6.9% aluminum, 12.2% chromium, 1.5% carbon, 0.2-0.7% yttrium, 0.7-1.4 atomic percent of an element selected from the group consisting of manganese, technetium and rhenium, and mixtures thereof, balance essentially nickel.
Claim 6
Dependent Claim
40 words
A turbine engine component as in claim 3 in which the yttrium content is replaced in whole or in part by a material selected from the group consisting of scandium, lanthanum, the lanthanide elements and Misch metal, and mixtures thereof.
Claim 7
Dependent Claim
16 words
A composition as in claim 1 in which the yttrium level is from 0.2-0.7 weight percent.
Claim 8
Dependent Claim
46 words
In a directionally solidified eutectic superalloy article having a nominal composition of 6.9% aluminum, 12.2% chromium, 1.5% carbon, 0-1% yttrium, balance essentially nickel, the improvement which comprises: 0.7-1.4 atomic percent of an element selected from the group consisting of manganese, technetium and rhenium, and mixtures thereof.
Claim 9
Dependent Claim
46 words
In a directionally solidified eutectic superalloy article having a nominal composition of 6.9% aluminum, 12.2% chromium, 1.5% carbon, 0-1% yttrium, balance essentially nickel, the improvement which comprises: 0.7-1.4 atomic percent of an element selected from the group consisting of manganese, technetium and rhenium, and mixtures thereof.
References Cited (Backward Citations)
US3124452A
Cited
US3564940A
Cited
US3554817A
Cited
US3671223A
Cited
US3793010A
Cited
GB1484007A
Cited
US4012241A
Cited
US4111723A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-09-23 | 1989-03-25 | 1989-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-23 | 1993-03-25 | 1993-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-23 | 1997-03-25 | 1997-09-24 | $7700.00 | Window Closed / Lapsed |