US3568757A - Mold for producing single crystals - Google Patents
Mold for producing single crystals Download PDFInfo
- Publication number
- US3568757A US3568757A US746577A US3568757DA US3568757A US 3568757 A US3568757 A US 3568757A US 746577 A US746577 A US 746577A US 3568757D A US3568757D A US 3568757DA US 3568757 A US3568757 A US 3568757A
- Authority
- US
- United States
- Prior art keywords
- mold
- article
- lateral branch
- point
- starter
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000013078 crystal Substances 0.000 title claims abstract description 9
- 238000005266 casting Methods 0.000 claims abstract description 9
- 239000007858 starting material Substances 0.000 claims description 28
- 208000003351 Melanosis Diseases 0.000 claims description 4
- 229910045601 alloy Inorganic materials 0.000 description 6
- 239000000956 alloy Substances 0.000 description 6
- 238000007711 solidification Methods 0.000 description 3
- 230000008023 solidification Effects 0.000 description 3
- 229910001338 liquidmetal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 208000016311 Freckling Diseases 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007598 dipping method Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000003754 machining Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/04—Influencing the temperature of the metal, e.g. by heating or cooling the mould
- B22D27/045—Directionally solidified castings
Definitions
- a feature of this invention is a'mold that is adapted to produce single-crystal cast articles free of inclusions and with the desired dendritic orientation with respect to the axis of the cast article.
- Another feature is an arrangement by which to produce a plurality of cast articles at one time in a single mold, all with the appropriate crystalline orientation.
- FIG. 1 is a horizontal sectional view of a mold construction along broken line 1-1 of FIG..2.
- FIG. 2 is a vertical sectional view of the mold substantially along the line 2-2 6f FIG. I with one of the side branches broken away.
- FIG. 3 is a vertical sectional view of the mold of FIG. 1 at right angles to FIG. 2 and the broken lines 3-3 of FIG. 1.
- F10. 4 is a sectional view of a modification of the article portion of the mold.
- the mold of the invention is a shell mold and may be produced by making a wax pattern of the entire cast structure, then successively dipping the pattern in mold material until an adequate thickness of shell is built up. The mold is then cured at a temperature that will melt the wax so it flows out of the mold. This is now a well established technique and not a part of the present invention. The latter involves the mold arrangement to produce the desired results.
- the single-crystal cast article is described and claimed in the above-identified Piearcey U.S. Pat. No. 3,494,809.
- the mold of the invention is hollow throughout and has a central starter portion -2 preferably square in cross section with an open lower end 4 that is adapted to rest on a chill plate 6 during the casting process.
- the chill plate causes controlled solidification by heat removal from the metal or alloy at a selected rate.
- the starter portion 2 has a constriction 8 therein at a point spaced from the open lower end such that above this constriction the starter portion is smaller in cross-sectional area but of substantially constant cross-sectional area for the remainder of the starter portion to the top thereof. In this way only the central portion of the grain growth directly above the chill plate is continued into the smaller dimension of the starter portion.
- lateral branch portions 12 also preferably rectilinear in cross section.
- Each branch portion I2 has an upward slope away from the starter portion, as shown.
- a small constriction 14 extending across the side of the starter portion to which the branch portion is attached. This constriction materially reduces the number of columnar grains at this point and promotes a coarsening of the grains. Only these grains exposed to the branch portion above this constriction grow laterally into the branch and these grains then become platelike as represented by the individual grains 16 FIG. 1. Thus only a few columnar grains are formed in these branch portions and most of the grains extend substantially the length ofthe branch portion.
- the article mold portions 18 are attached to the sides of the branch portions at points spaced from the ends of the branches by transverse connecting mold portions 20 which have a slope upward from the branch portion. Just before the attachment of the transverse mold portions the branch portion has a constriction 22 along each side of the branch portion to which the transverse portion is attached. This reduces the grain growth in this areaand assures the location of a single platelike grain at the inlet end of each transverse portion. Thus, in these transverse portions, there will be only a single grain growth and this will continue into the article mold.
- the article mold shown is a turbine blade mold having a root section 24 at the base where it attaches to the transvers portion, an airfoil section 26 and a shroud section 28.
- the longitudinal axis of this mold passes through the root, airfoil and shroud sections and is the axis along which the blade has the highest loading in operation. It is along this axis that the (00l orientation should be and thus the longitudinal axis is located at right angles to the bottom opening in the mold and thus at right angles to the chill plate.
- the vertical orientation of the dendritic growth in the columnar grains in the starter portion is continued into the dendritic growth in article portions all in parallel relation.
- each transverse portion is also preferably rectangular in cross section and, adjacent to the outer end, each transverse portion has a freckle catcher or blind riser 30 consisting of an upwardly extending recess in the mold. This recess receives any foreign particles floating on the liquid metal or alloy so that they are excluded from the article portion of the mold. These foreign particles if not entrapped may serve as nucleation sites for undesired grain growth. The appearance of these grains on the surface of the cast article is referred to as freckling.
- the extension of the starter portion 31 beyond the branch attachment, and the extension of the branch portions 33 beyond the transverse attachments provides improved perfection of grain orientation and serves as added pockets for entrapment of inclusions.
- the several features above described each contributes in its way in assuring a single-crystal cast article free of inclusions and surface defects and with the desired crystalline orientation.
- the mold also includes a pouring sprue by which the mold may be filled with metal or alloy.
- this sprue 32 is attached to the top ends of the several article portions to assure complete filling of the entire mold including each article portion.
- the orientation of the dendritic structure of the single crystal in each article may be controlled by appropriate orientation of the axis of the article portion with respect to the chill plate.
- a mold for producing directionally-oriented, singlecrystal castings the mold being positioned on a chill plate for the casting operation, said mold including a central starter portion open at its lower end to rest on the chill plate at least one lateral branch extending laterally from and connected at the side of the central portion at a point spaced from the open lower end thereof, said branch having a substantially vertical side opening therein substantially parallel to the longitudinal axis of the lateral branch, and at least one substantially vertically arranged article mold attached laterally at the lower end thereof to the side of the lateral branch at said side opening and extending upwardly therefrom, said article mold being in substantial horizontal communication with the lateral branch through said side opening in said branch, the longitudinal axis of the article mold extending substantially at right angles to the open end of the starter portion.
- a mold as in claim 1 in which the article mold portion is connected to the lateral branch by a transverse connecting mold portion.
- a mold as in claim 1 in which there are at least two lateral branches and at least two article mold portions in opposed relation on each lateral branch.
- a mold as in claim 1 in which there is protuberance on the lateral branch close to the article mold portion and at a point between the article mold portion and the central starter portion to form a constriction.
- a mold as in claim 1 in which a freckle catcher is formed at point of attachment of the article mold portion to the lateral branch in the form of an upwardly extending recess in the mold.
- a mold for producing directionally-oriented, singlecrystal castings the mold being positioned on a chill plate for the casting operation, said mold including a central starter portion having its lower end open to rest on the chill plate, said portion extending substantially vertically, at least one lateral branch portion extending outwardly from the side of the central portion at a point below the top thereof, and at least one article mold attached at the side of the lateral branch portion at a point spaced from the end of the branch portion.
- a mold as in claim 8 in which there is a restriction in the central starter portion below the lateral branch.
- a mold as in claim 8 in which there is a restriction in the lateral branch between the starter portion and the attachment point of the article mold.
- a mold as in claim 8 in which there is a transverse connecting mold portion between the lateral branch and the article mold.
- a mold as in claim 11 in which there is a blind riser in the transverse connecting mold portion adjacent to the article mold.
- a mold as in claim 8 in which there are a plurality of lateral branch portions projecting from the starter portion, and a plurality of article molds on the sides of each lateral branch and in which the longitudinal axes of the article molds are oriented with respect to the open lower end of the starter portion to produce the desired orientation in the cast article.
- a mold as in claim 8 in which the central starter portion is reduced in cross-sectional area at a point between the open bottom end and the attachment of the lateral branch thereto.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The mold is intended for producing single cast articles and is adapted for multiple casting having a central mold portion with lateral branches from the sides of which single crystals grow into the article molds.
Description
United States Patent Barry J. Piearcey Galmpton, Brixham, Devon, England 746,577
July 22, 1968 Mar. 9, 1971 United Aircraft Corporation East Hartford, Conn.
Inventor Appl. No. Filed Patented Assignee MOLD FOR PRODUCING SINGLE CRYSTALS 14 Claims, 4 Drawing Figs.
U.S. Cl 164/353, 164/60, 164/127, 164/361 Int. Cl B22d 15/0 B22d 25/06 Field of Search 164/60, 127, 338, 353, 361; 148/1.6;23/(Inquired); 415/177, 216; 416/241 [56] References Cited UNITED STATES PATENTS 3,204,303 9/1965 Chandley 164/127X 3,342,455 9/1967 Fleck et al. 253/77 3,376,915 4/1968 Chandley l64/60UX 3,441,078 4/1969 Chandley 164/361X Primary ExaminerJ. Spencer Overholser Assistant Examiner-John E. Roethel Attorney-Charles A. Warren ABSTRACT: The mold is intended for producing single crystal cast articles and is adapted for multiple casting having a central mold portion with lateral branches from the sides of which single cyrstals grow into the article molds.
MOLD FOR PRODUCING SINGLE QRYSTALS BACKGROUND OF THE INVENTION SUMMARY OF INVENTION A feature of this invention is a'mold that is adapted to produce single-crystal cast articles free of inclusions and with the desired dendritic orientation with respect to the axis of the cast article.
Another feature is an arrangement by which to produce a plurality of cast articles at one time in a single mold, all with the appropriate crystalline orientation.
BRIEF DESCRIPTION OF THE DRAWING FIG. 1 is a horizontal sectional view of a mold construction along broken line 1-1 of FIG..2.
FIG. 2 is a vertical sectional view of the mold substantially along the line 2-2 6f FIG. I with one of the side branches broken away.
FIG. 3 is a vertical sectional view of the mold of FIG. 1 at right angles to FIG. 2 and the broken lines 3-3 of FIG. 1.
F10. 4 is a sectional view of a modification of the article portion of the mold.
DESCRIPTION OF THE PREFERRED EMBODIMENT The mold of the invention is a shell mold and may be produced by making a wax pattern of the entire cast structure, then successively dipping the pattern in mold material until an adequate thickness of shell is built up. The mold is then cured at a temperature that will melt the wax so it flows out of the mold. This is now a well established technique and not a part of the present invention. The latter involves the mold arrangement to produce the desired results. The single-crystal cast article is described and claimed in the above-identified Piearcey U.S. Pat. No. 3,494,809. The mold of the invention is hollow throughout and has a central starter portion -2 preferably square in cross section with an open lower end 4 that is adapted to rest on a chill plate 6 during the casting process. The chill plate causes controlled solidification by heat removal from the metal or alloy at a selected rate. The starter portion 2 has a constriction 8 therein at a point spaced from the open lower end such that above this constriction the starter portion is smaller in cross-sectional area but of substantially constant cross-sectional area for the remainder of the starter portion to the top thereof. In this way only the central portion of the grain growth directly above the chill plate is continued into the smaller dimension of the starter portion.
Grain growth in columnar form, as described in the Ver- Snyder U.S. Pat. No. 3,260,505 is started at the chill plate and is propagated upward as solidification occurs. The mold is held at a temperature above the melting point of the alloy until the alloy is poured so that solidification will begin only at the chill plate. It will be understood that the columnar grains in the starter portion have a preferred (001) orientation. They are represented in FIG. 1 by the column ends 10.
Mounted on opposite sides of the starter portion 2 and at a point below the top thereof and above the restriction 8 are lateral branch portions 12 also preferably rectilinear in cross section. Each branch portion I2 has an upward slope away from the starter portion, as shown. Directly below the attachment of each branch portion to the starter portion there is a small constriction 14 extending across the side of the starter portion to which the branch portion is attached. This constriction materially reduces the number of columnar grains at this point and promotes a coarsening of the grains. Only these grains exposed to the branch portion above this constriction grow laterally into the branch and these grains then become platelike as represented by the individual grains 16 FIG. 1. Thus only a few columnar grains are formed in these branch portions and most of the grains extend substantially the length ofthe branch portion.
The article mold portions 18 are attached to the sides of the branch portions at points spaced from the ends of the branches by transverse connecting mold portions 20 which have a slope upward from the branch portion. Just before the attachment of the transverse mold portions the branch portion has a constriction 22 along each side of the branch portion to which the transverse portion is attached. This reduces the grain growth in this areaand assures the location of a single platelike grain at the inlet end of each transverse portion. Thus, in these transverse portions, there will be only a single grain growth and this will continue into the article mold.
The article mold shown is a turbine blade mold having a root section 24 at the base where it attaches to the transvers portion, an airfoil section 26 and a shroud section 28. The longitudinal axis of this mold passes through the root, airfoil and shroud sections and is the axis along which the blade has the highest loading in operation. It is along this axis that the (00l orientation should be and thus the longitudinal axis is located at right angles to the bottom opening in the mold and thus at right angles to the chill plate. Thus the vertical orientation of the dendritic growth in the columnar grains in the starter portion is continued into the dendritic growth in article portions all in parallel relation.
The transverse portions are also preferably rectangular in cross section and, adjacent to the outer end, each transverse portion has a freckle catcher or blind riser 30 consisting of an upwardly extending recess in the mold. This recess receives any foreign particles floating on the liquid metal or alloy so that they are excluded from the article portion of the mold. These foreign particles if not entrapped may serve as nucleation sites for undesired grain growth. The appearance of these grains on the surface of the cast article is referred to as freckling.
The extension of the starter portion 31 beyond the branch attachment, and the extension of the branch portions 33 beyond the transverse attachments provides improved perfection of grain orientation and serves as added pockets for entrapment of inclusions. The several features above described each contributes in its way in assuring a single-crystal cast article free of inclusions and surface defects and with the desired crystalline orientation.
It will be understood that the mold also includes a pouring sprue by which the mold may be filled with metal or alloy. In the arrangement shown this sprue 32 is attached to the top ends of the several article portions to assure complete filling of the entire mold including each article portion. It will be understood that the orientation of the dendritic structure of the single crystal in each article may be controlled by appropriate orientation of the axis of the article portion with respect to the chill plate.
As shown in FIG. 4, it may be desirable to add additional freckle catchers in the article portion of the mold. To this end there are provided recesses 34 at the leading and trailing edges of the airfoil section 26 of the article portion of the mold in which any impurities remaining on the surface of the liquid metal or alloy will be collected. These recesses form projections 36 on the cast article which are removed by appropriate machining to produce the desired contour at leading and trailing ends of the airfoil section of the finished article.
Iclaim:
1. A mold for producing directionally-oriented, singlecrystal castings, the mold being positioned on a chill plate for the casting operation, said mold including a central starter portion open at its lower end to rest on the chill plate at least one lateral branch extending laterally from and connected at the side of the central portion at a point spaced from the open lower end thereof, said branch having a substantially vertical side opening therein substantially parallel to the longitudinal axis of the lateral branch, and at least one substantially vertically arranged article mold attached laterally at the lower end thereof to the side of the lateral branch at said side opening and extending upwardly therefrom, said article mold being in substantial horizontal communication with the lateral branch through said side opening in said branch, the longitudinal axis of the article mold extending substantially at right angles to the open end of the starter portion.
2. A mold as in claim 1 in which the article mold portion is connected to the lateral branch by a transverse connecting mold portion.
3 A mold as in claim 1 in which the article mold portion is attached to the lateral branch at a point spaced from the outer end thereof.
4. A mold as in claim 1 in which there are at least two lateral branches and at least two article mold portions in opposed relation on each lateral branch.
5. A mold as in claim 1 in which there is protuberance on the lateral branch close to the article mold portion and at a point between the article mold portion and the central starter portion to form a constriction.
6. A mold as in claim 1 in which a freckle catcher is formed at point of attachment of the article mold portion to the lateral branch in the form of an upwardly extending recess in the mold.
7. A mold as in claim 1 in which the lateral branch extends from the central portion at a point below the top thereof.
8. A mold for producing directionally-oriented, singlecrystal castings, the mold being positioned on a chill plate for the casting operation, said mold including a central starter portion having its lower end open to rest on the chill plate, said portion extending substantially vertically, at least one lateral branch portion extending outwardly from the side of the central portion at a point below the top thereof, and at least one article mold attached at the side of the lateral branch portion at a point spaced from the end of the branch portion.
9. A mold as in claim 8 in which there is a restriction in the central starter portion below the lateral branch.
10. A mold as in claim 8 in which there is a restriction in the lateral branch between the starter portion and the attachment point of the article mold.
11. A mold as in claim 8 in which there is a transverse connecting mold portion between the lateral branch and the article mold.
12. A mold as in claim 11 in which there is a blind riser in the transverse connecting mold portion adjacent to the article mold.
13. A mold as in claim 8 in which there are a plurality of lateral branch portions projecting from the starter portion, and a plurality of article molds on the sides of each lateral branch and in which the longitudinal axes of the article molds are oriented with respect to the open lower end of the starter portion to produce the desired orientation in the cast article.
14. A mold as in claim 8 in which the central starter portion is reduced in cross-sectional area at a point between the open bottom end and the attachment of the lateral branch thereto.
Claims (13)
- 2. A mold as in claim 1 in which the article mold portion is connected to the lateral branch by a transverse connecting mold portion.
- 3. A mold as in claim 1 in which the article mold portion is attached to the lateral branch at a point spaced from the outer end thereof.
- 4. A mold as in claim 1 in which there are at least two lateral branches and at least two article mold portions in opposed relation on each lateral branch.
- 5. A mold as in claim 1 in which there is protuberance on the lateral branch close to the article mold portion and at a point between the article mold portion and the central starter portion to form a constriction.
- 6. A mold as in claim 1 in which a freckle catcher is formed at point of attachment of the article mold portion to the lateral branch in the form of an upwardly extending recess in the mold.
- 7. A mold as in claim 1 in which the lateral branch extends from the central portion at a point below the top thereof.
- 8. A mold for producing directionally-oriented, single-crystal castings, the mold being positioned on a chill plate for the casting operation, said mold including a central starter portion having its lower end open to rest on the chill plate, said portion extending substantially vertically, at least one lateral branch portion extending outwardly from the side of the central portion at a point below the top thereof, and at least one article mold attached at the side of the lateral branch portion at a point spaced from the end of the branch portion.
- 9. A mold as in claim 8 in which there is a restriction in the central starter portion below the lateral branch.
- 10. A mold as in claim 8 in which there is a restriction in the lateral branch between the starter portion and the attachment point of the article mold.
- 11. A mold as in claim 8 in which there is a transverse connecting mold portion between the lateral branch and the article mold.
- 12. A mold as in claim 11 in which there is a blind riser in the transverse connecting mold portion adjacent to the article mold.
- 13. A mold as in claim 8 in which there are a plurality of lateral branch portions projecting from the starter portion, and a plurality of article molds on the sides of each lateral branch and in which the longitudinal axes of the article molds are oriented with respect to the opeN lower end of the starter portion to produce the desired orientation in the cast article.
- 14. A mold as in claim 8 in which the central starter portion is reduced in cross-sectional area at a point between the open bottom end and the attachment of the lateral branch thereto.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US74657768A | 1968-07-22 | 1968-07-22 |
Publications (1)
Publication Number | Publication Date |
---|---|
US3568757A true US3568757A (en) | 1971-03-09 |
Family
ID=25001438
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US746577A Expired - Lifetime US3568757A (en) | 1968-07-22 | 1968-07-22 | Mold for producing single crystals |
Country Status (1)
Country | Link |
---|---|
US (1) | US3568757A (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2242111A1 (en) * | 1971-09-15 | 1973-03-22 | United Aircraft Corp | METHOD AND DEVICE FOR CASTING OBJECTS WITH DIRECTLY SOLIDIZED JOINT |
US4548255A (en) * | 1982-03-01 | 1985-10-22 | United Technologies Corporation | Mold with starter and selector sections for directional solidification casting |
US4580613A (en) * | 1982-08-05 | 1986-04-08 | Howmet Turbine Components Corporation | Method and mold for casting articles having a predetermined crystalline orientation |
US4612969A (en) * | 1983-04-27 | 1986-09-23 | Howmet Turbine Components Corporation | Method of and apparatus for casting articles with predetermined crystalline orientation |
US4704258A (en) * | 1986-04-01 | 1987-11-03 | Grumman Aerospace Corporation | Method and apparatus for growth of single crystal material in space |
US4804311A (en) * | 1981-12-14 | 1989-02-14 | United Technologies Corporation | Transverse directional solidification of metal single crystal articles |
EP0637476A1 (en) * | 1993-08-06 | 1995-02-08 | Hitachi, Ltd. | Blade for gas turbine, manufacturing method of the same, and gas turbine including the blade |
US20050045300A1 (en) * | 2003-09-02 | 2005-03-03 | General Electric Company | Apparatus and method for producing single crystal metallic objects |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3204303A (en) * | 1963-06-20 | 1965-09-07 | Thompson Ramo Wooldridge Inc | Precision investment casting |
US3342455A (en) * | 1964-11-24 | 1967-09-19 | Trw Inc | Article with controlled grain structure |
US3376915A (en) * | 1964-10-21 | 1968-04-09 | Trw Inc | Method for casting high temperature alloys to achieve controlled grain structure and orientation |
US3441078A (en) * | 1967-02-01 | 1969-04-29 | Trw Inc | Method and apparatus for improving grain structures and soundness of castings |
-
1968
- 1968-07-22 US US746577A patent/US3568757A/en not_active Expired - Lifetime
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3204303A (en) * | 1963-06-20 | 1965-09-07 | Thompson Ramo Wooldridge Inc | Precision investment casting |
US3376915A (en) * | 1964-10-21 | 1968-04-09 | Trw Inc | Method for casting high temperature alloys to achieve controlled grain structure and orientation |
US3342455A (en) * | 1964-11-24 | 1967-09-19 | Trw Inc | Article with controlled grain structure |
US3441078A (en) * | 1967-02-01 | 1969-04-29 | Trw Inc | Method and apparatus for improving grain structures and soundness of castings |
Cited By (10)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2242111A1 (en) * | 1971-09-15 | 1973-03-22 | United Aircraft Corp | METHOD AND DEVICE FOR CASTING OBJECTS WITH DIRECTLY SOLIDIZED JOINT |
US4804311A (en) * | 1981-12-14 | 1989-02-14 | United Technologies Corporation | Transverse directional solidification of metal single crystal articles |
US4548255A (en) * | 1982-03-01 | 1985-10-22 | United Technologies Corporation | Mold with starter and selector sections for directional solidification casting |
US4580613A (en) * | 1982-08-05 | 1986-04-08 | Howmet Turbine Components Corporation | Method and mold for casting articles having a predetermined crystalline orientation |
US4612969A (en) * | 1983-04-27 | 1986-09-23 | Howmet Turbine Components Corporation | Method of and apparatus for casting articles with predetermined crystalline orientation |
US4704258A (en) * | 1986-04-01 | 1987-11-03 | Grumman Aerospace Corporation | Method and apparatus for growth of single crystal material in space |
EP0637476A1 (en) * | 1993-08-06 | 1995-02-08 | Hitachi, Ltd. | Blade for gas turbine, manufacturing method of the same, and gas turbine including the blade |
US5611670A (en) * | 1993-08-06 | 1997-03-18 | Hitachi, Ltd. | Blade for gas turbine |
US20050045300A1 (en) * | 2003-09-02 | 2005-03-03 | General Electric Company | Apparatus and method for producing single crystal metallic objects |
US7011141B2 (en) * | 2003-09-02 | 2006-03-14 | General Electric Company | Apparatus and method for producing single crystal metallic objects |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US3620289A (en) | Method for casting directionally solified articles | |
US4469161A (en) | Method of and mould for making a cast single crystal | |
US3401738A (en) | Core location in precision casting | |
US8540010B2 (en) | Sequential mold filling | |
US3376915A (en) | Method for casting high temperature alloys to achieve controlled grain structure and orientation | |
GB1369270A (en) | Casting of directionally solidified articles | |
US3568757A (en) | Mold for producing single crystals | |
US3752221A (en) | Mold apparatus for casting with downward unidirectional solidification | |
US3690368A (en) | Casting single crystal articles | |
US3580324A (en) | Double-oriented single crystal castings | |
US3572419A (en) | Doubly-oriented single crystal castings | |
US4609029A (en) | Method of reducing casting time | |
US4612969A (en) | Method of and apparatus for casting articles with predetermined crystalline orientation | |
US3417809A (en) | Method of casting directionally solidified articles | |
US5404930A (en) | Method and apparatus for casting an airfoil | |
US20010001415A1 (en) | Method and apparatus for making directional solidification castings | |
US3598172A (en) | Process of casting with downward-unidirectional solidification | |
US3667533A (en) | Making directionally solidified castings | |
US4809764A (en) | Method of casting a metal article | |
US3724531A (en) | Mold for casting single crystal articles | |
EP0059549A2 (en) | Method of casting an article | |
US3625275A (en) | Apparatus and method for single-crystal casting | |
EP0059550B1 (en) | Method of casting | |
US3519063A (en) | Shell mold construction with chill plate having uniform roughness | |
US3485291A (en) | Method of casting by directional solidification |