Patent US4184900A successfully refreshed from Google Patents.
US4184900A
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Control of microstructure in cast eutectic articles
Assignee: RTX Corp
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Filing: 1977-09-02
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Granted: 1980-01-22
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Expires: 1997-09-02
Abstract
Abstract This invention concerns a method for controlling the microstructure of directionally solidified eutectic articles and the article produced thereby. The method is particularly appropriate for the production of articles such as turbine blades which require different mechanical properties in different areas of the article. The microstructure is controlled by varying the directional solidification conditions during the casting process.
Inventors
- 👤 John S. Erickson
- 👤 Earl R. Thompson
- 👤 Patrick M. Curran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:45
CPC Classifications
B; B22; B22D; B22D27/00; B22D27/04; B22D27/045; C; C30; C30B; C30B21/00; C30B21/02; Y; Y10; Y10S; Y10S148/00; Y10S148/902
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
26 words
A directionally solidified eutectic article having at least one portion with a cellular microstructure and at least one further portion having a fully oriented fibrous microstructure.
Claim 2
Dependent Claim
26 words
A directionally solidified eutectic article having at least one portion with a cellular microstructure and at least one further portion having a fully oriented fibrous microstructure.
Claim 3
Dependent Claim
31 words
An article as in claim 1 in the shape of a turbine blade with an airfoil section with a completely oriented fibrous microstructure and a root section with a cellular microstructure.
Claim 4
Dependent Claim
45 words
An article as in claim 2 wherein the completely oriented microstructure has an average degree of misalignment of less than about 5° from the solidification axis and the cellular microstructure has an average degree of misalignment between about 6° and 15° from the solidification axis.
Claim 5
Dependent Claim
13 words
An article as in claim 3 composed of a nickel base superalloy eutectic.
References Cited (Backward Citations)
US3939895A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-01-21 | 1983-07-23 | 1984-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-21 | 1987-07-23 | 1988-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-21 | 1991-07-23 | 1992-01-22 | $7700.00 | Window Closed / Lapsed |