Patent US4804311A successfully refreshed from Google Patents.
US4804311A
Expired / Lapsed
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Transverse directional solidification of metal single crystal articles
Assignee: RTX Corp
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Filing: 1981-12-14
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Granted: 1989-02-14
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Expires: 2001-12-14
Abstract
Abstract During conventional directional solidification of a single crystal article having a large overhanging flange lying along its length, crystal nucleation defects and shrinkage occur in the flange. To form articles without such defects, the part is cast so that the solidification front moves transverse to the length of the article, and essentially parallel to the flange surfaces where the defects tend to occur. The solidification front is initiated at a seed crystal oriented to produce the desired crystal structure in the cast article. Dendritic effects produce somewhat different properties in articles cast in accord with the invention, compared to those cast with prior art techniques.
Inventors
- 👤 Neal P. Anderson
- 👤 Anthony F. Giamei
- 👤 Richard W. Salkeld
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 22:27
CPC Classifications
F; F01; F01D; F01D5/00; F01D5/12; F01D5/28; B; B22; B22D; B22D27/00; B22D27/04; B22D27/045; C; C30; C30B; C30B11/00; C30B29/00; C30B29/10; C30B29/52
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
109 words
A single crystal article having orthogonal x, y and z axes and having a body lying along the z axis and a flange lying at an angle thereto, the flange and the body having abutting surfaces intersecting with an angle A between 70°-120°; the flange containing a point located a perpendicular distance L from the nearest z axis surface of the body, the distance L in centimeters being greater than ##EQU3## wherein A is in degrees; the article made by directional solidification using a seed, wherein a solidification front initiated at the second is caused to form the part by moving through the article transverse to the z axis.
Claim 2
Dependent Claim
109 words
A single crystal article having orthogonal x, y and z axes and having a body lying along the z axis and a flange lying at an angle thereto, the flange and the body having abutting surfaces intersecting with an angle A between 70°-120°; the flange containing a point located a perpendicular distance L from the nearest z axis surface of the body, the distance L in centimeters being greater than ##EQU3## wherein A is in degrees; the article made by directional solidification using a seed, wherein a solidification front initiated at the second is caused to form the part by moving through the article transverse to the z axis.
Claim 3
Dependent Claim
14 words
The article of claim 1 having two opposing flanges spaced apart along the body.
Claim 4
Dependent Claim
16 words
The article of claim 2 having the shape of a vane for a gas turbine engine.
Claim 5
Dependent Claim
24 words
The article of claim 1 comprised of a face centered cubic crystal structure superalloy, with a crystallographic orientation of [001] along the z axis.
Claim 6
Dependent Claim
19 words
The article of claim 1 where L is at least 2.5 centimeters and A is less than about 105°.
Claim 7
Independent Claim
136 words
The method of directionally solidifying as a single crystal structure an article having orthogonal x, y and z axes wherein the article is comprised of a body part and a flange part, the body lying along the z axis and the flange lying at an angle thereto, the flange and the body having abutting surfaces intersecting with an angle A between 70°-120°; the flange containing a point located a perpendicular distance L from the nearest z axis surface of the body, the distance L in centimeters being greater than ##EQU4## wherein A is in degrees; characterized by initiating a solidification front at a seed and moving the front through the article in a direction transverse to the z axis, the seed providing in the solidified article a desired crystallographic orientation with respect to the z axis.
Claim 8
Independent Claim
136 words
The method of directionally solidifying as a single crystal structure an article having orthogonal x, y and z axes wherein the article is comprised of a body part and a flange part, the body lying along the z axis and the flange lying at an angle thereto, the flange and the body having abutting surfaces intersecting with an angle A between 70°-120°; the flange containing a point located a perpendicular distance L from the nearest z axis surface of the body, the distance L in centimeters being greater than ##EQU4## wherein A is in degrees; characterized by initiating a solidification front at a seed and moving the front through the article in a direction transverse to the z axis, the seed providing in the solidified article a desired crystallographic orientation with respect to the z axis.
Claim 9
Dependent Claim
19 words
The method of claim 6 characterized in that the article has two opposing flanges, spaced apart along the body.
Claim 10
Dependent Claim
42 words
The method of claim 5 characterized in that the article is a vane for a gas turbine engine, the body shaped as an airfoil with leading and trailing edges, the front moving from one edge of the airfoil, to the opposing edge.
Claim 11
Dependent Claim
42 words
The method of claim 6 characterized by an article comprised of a face centered cubic crystal structure superalloy, with a desired crystallographic orientation of [001] along the z axis, the seed having a [001] crystal axis lying parallel to the z axis.
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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) | 1992-02-14 | 1992-08-15 | 1993-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-14 | 1996-08-15 | 1997-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-14 | 2000-08-15 | 2001-02-14 | $7700.00 | Window Closed / Lapsed |