WO2003072284A2 - Method of removing casting defects - Google Patents
Method of removing casting defects Download PDFInfo
- Publication number
- WO2003072284A2 WO2003072284A2 PCT/IB2003/000362 IB0300362W WO03072284A2 WO 2003072284 A2 WO2003072284 A2 WO 2003072284A2 IB 0300362 W IB0300362 W IB 0300362W WO 03072284 A2 WO03072284 A2 WO 03072284A2
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- casting defect
- article
- defect
- casting
- melting
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D5/00—Blades; Blade-carrying members; Heating, heat-insulating, cooling or antivibration means on the blades or the members
- F01D5/005—Repairing methods or devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D19/00—Casting in, on, or around objects which form part of the product
- B22D19/10—Repairing defective or damaged objects by metal casting procedures
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
- B23P6/002—Repairing turbine components, e.g. moving or stationary blades, rotors
- B23P6/007—Repairing turbine components, e.g. moving or stationary blades, rotors using only additive methods, e.g. build-up welding
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B11/00—Single-crystal growth by normal freezing or freezing under temperature gradient, e.g. Bridgman-Stockbarger method
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B13/00—Single-crystal growth by zone-melting; Refining by zone-melting
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/52—Alloys
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B33/00—After-treatment of single crystals or homogeneous polycrystalline material with defined structure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/001—Turbines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F05—INDEXING SCHEMES RELATING TO ENGINES OR PUMPS IN VARIOUS SUBCLASSES OF CLASSES F01-F04
- F05D—INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS
- F05D2300/00—Materials; Properties thereof
- F05D2300/60—Properties or characteristics given to material by treatment or manufacturing
- F05D2300/606—Directionally-solidified crystalline structures
Definitions
- the invention relates to a method of removing casting defects in articles with oriented microstructure.
- Single crystal and directionally solidified castings are manufactured using a directional solidification process in which a ceramic shell mould filled with an alloy in the liquid state is withdrawn from a heating zone (temperature above the melting point of the alloy) into a cooling zone (well below the melting point of the alloy in temperature).
- a heating zone temperature above the melting point of the alloy
- a cooling zone well below the melting point of the alloy in temperature.
- the liquid alloy solidifies direction- ally - beginning with that portion of the mould that enters the cooling zone first, and ending with the last portion of the mould to enter the cooling zone.
- the solid/liquid interface is found substantially at a level between the heating and cooling zones.
- Freckles are also considered critical defects in columnar grain alloys, despite their higher content of grain boundary strengtheners.
- new grains can nucleate and grow for a limited distance in the direction of growth of the solid/liquid interface, provided that the primary orientation (crystallographic orientation relative to the growth direction) is close to that of the rest of the casting.
- This defect is known as a sliver, and can reach lengths of 5 cm or more. Since it may comprise a high angle boundary which is almost always impossible to measure using Laue methods due to the limited width of the grain, slivers are also considered critical defects.
- Other grain related linear defects include low angle grain boundaries which are above the allowed limit of misorientation.
- Non grain related linear defects include linear chains of pores, surface micro-cracks and dross or inclusions which are normally only detectable using Flourescent Penetrant Inspection (FPI).
- FPI Flourescent Penetrant Inspection
- Another well known potential defect in single crystal and columnar-grained castings is recrystal- lized grains. Although these develop only during the solution heat treatment and/or reconditioning, repair, rejuvenation treatments, they can be considered casting defects since they are caused by excessive local deformation of the cast article due to the differential thermal contraction of the casting alloy, ceramic core and ceramic shell mold as the casting assembly cools. Recrys- tallized grains typically occur in the regions of highest deformation which are usually fillets, corners and design features which constrain the core or shell against the cast article.
- freckles are a well known problem as it is desirable to pull castings as quickly as possible into the cold zone, but more rapid withdrawal also results in lower thermal gradients across the solid- liquid interface.
- the rate of rejection can be anywhere from under 5% to over 50% depending on the alloy used and size of the article.
- the casting process parameters are always developed in order to achieve a balance between production rate and the rate of rejection from casting defects to optimize overall process eco- nomics.
- EP-A1-0 558 870 describes free form welding of metallic articles with a laser where already built-up material acts as a substrate for newly deposited metal. However, the authors either use powder or wire feed and pulsed laser irradiation.
- EP-A1-0 740 977 furthermore describes a containerless method of producing crack free metallic articles using a laser beam operating at moderate power density. A large diameter beam produces a shallow melt pool from which single crystal articles are generated by addition of powder. The rela- tively long interaction time is claimed to be advantageous to reduce the cracks resulting from hot tearing defects during solidification. The method, however, focusses on the generation of new parts. Also the process parameters are chosen in order to reduce thermal gradients and thus stress, which is not favourable for single crystal solidification.
- US-A-5, 837,960 describes a computer aided laser manufacturing process which is used to generate articles by laser/powder techniques. Again, the addition of powder is an essential part of that invention.
- US-A-5, 312,584 de-scribes a moldless/coreless method of producing single crystal castings of nickel-aluminides. In this case a laser is used to melt a Ni-AI target which melts, forms a drip and solidifies on an underlying single crystal substrate.
- DE-C1 -199 49 972 uses a laser method to generate 3D objects using a digitizer/optical vision system and layer by layer material build-up.
- the method requires additional material supply which is not necessary for the local repair of casting defects.
- the object of the present invention is to provide a method for removing casting defects from an article with oriented microstructure in an easy and cost- effective manner while restoring a defect-free grain structure and microstructure to the article.
- the heat source can be moved along the length of the casting defect.
- the molten material solidifies epitaxially with respect to the surrounding oriented microstructure of the article in a way that the solidified area is restored substantially to a volume as it was with the casting defect.
- a casting defect of one of the following can be re-melted: a freckle, a sliver, an equiaxed or recrystallized grain, a linear crack, a surface micro-crack, a chain of pores, a linear dross inclusion or a linear cluster of inclusions.
- additional material is added to the locally melted area during the welding operation, in order to compensate for the missing volume of the defect.
- material is added before the melting operation in the form of a preform solid, powder compress, paste or slurry and used to fill at least a portion of the defect that was remelted. Additional material can also be added when no portion of any defect has been removed. This material can have substantially the same composition as the underlying article.
- the defect is melted and re-solidified, and then a second melting operation is carried out while this time adding additional material. After the solidification of the alloy, excess material is machined away e.g. by grinding.
- One embodiment of the invention is to remove a portion of the casting defect by machining before re- melting begins.
- a vision system can be used to record locations on a specific article when it is in the grain etched condition to reveal grain related defects such as freckles, slivers or small equiaxed grains or in Flourescent Penetrant Inspection (FPI) to reveal linear cracks, chains of pores or linear dross/inclusions and then, again, later used to guide the heat source to these areas for melting the casting defect.
- grain related defects such as freckles, slivers or small equiaxed grains or in Flourescent Penetrant Inspection (FPI) to reveal linear cracks, chains of pores or linear dross/inclusions and then, again, later used to guide the heat source to these areas for melting the casting defect.
- FPI Flourescent Penetrant Inspection
- the casting defect is locally melted by at least one laser or at least one of Plasma Transfer Arc Welding, Micro Plasma Welding, Tungsten Inert Gas Welding, Electron Beam Welding. This can be done under an inert gas atmosphere, with inert gas shielding, or under vacuum. Larger penetration depths can be achieved by further reducing the processing speed or by preheating the article prior to the melting of the casting defect to a desired temperature in the range of 500 - 1000°C.
- This method is preferably applied to the article such as gas turbine components made from a nickel or cobalt base super alloy.
- These article will be a single crystal (SX) or directionally solidified (DS) microstructure.
- FIG. 1 shows a gas turbine blade having a casting defect
- Fig. 2 - 4 show different steps in the repair operation according to the present invention.
- Fig. 5 shows an example of an article with a re-melted surface layer.
- Figure 1 shows a single crystal (SX) or directionally solidified (DS) article 1 such as blades or vanes of gas turbine engines, the gas turbine blade comprising a root portion 2, a platform 3 and a blade 4 and having a surface 6.
- the article can as an example be made from a nickel or cobalt based super alloy.
- Investment casting methods for producing such SX or DS articles are known e.g. from the prior art US-A-4,96,501 , US-A-3,690,367 or EP-A1-0 749 790.
- the article 1 exhibits a linear casting defect 5 such as a freckle, a sliver or any equiaxed or recrystallized grains of limited size somewhere after the production process.
- Non grain related linear defects include linear chains of pores, surface micro-cracks and dross or inclusions.
- Figures 3 and 4 show the different steps of removing the casting defect 5 according to the present invention.
- a casting defect 5 is de- tected.
- Casting defects 5 are easily detected by using grain etching methods commonly known to those skilled in the art.
- Non grain related linear defects including linear chains of pores, surface micro-cracks and dross, inclusions or a linear cluster of inclusions are normally only detectable using Flourescent Penetrant Inspection (FPI).
- FPI Flourescent Penetrant Inspection
- the extremities may be demarcated with scribe marks or other such visible means such that after polishing or abrasive cleaning the site of the casting defect 5 is still apparent. It is also possible to leave a light grain etch on the surface and use that to weld in the correct areas. In either case, a vision system may be used to assist in the welding process. The system may be used to first record the position of the casting defect 5 (no marks are required) in the grain etched state and then used to guide the source of heat later for the repair operation.
- the article 1 is melted from the surface 6 in the region of the casting defect 5 by the use of a locally acting heat source 7, e.g. a laser, to a depth at least as great as the casting defect 5 itself.
- the heat source 7 reheats the affected zone above the melting point. If during this operation the ratio G ⁇ /V s (where G is the temperature gradient in the melt pool, n is a mate- rial constant and V s is the solidification speed) is kept above a material dependent threshold value, the subsequent solidification (as indicated in Figure 4 with repaired zone 10) will occur epitaxially, i.e. without creating new grain boundaries.
- the surrounding single crystal bulk material will act as a crystal seed for the remolten material. After solidification the remolten material will have the same microstructure as the bulk material without any defect so that the oriented microstructure is substantially restored to a volume as it used to be with the casting defect 5. The casting defect 5 will be thus remedied.
- lasers offer a particularly attractive choice for the heat source 7.
- Laser radiation can be focussed to small spots and generate thermal gradients in excess of 10 6 K/m. It is beneficial if the laser intensity is uniform over the heated area, which can be achieved by fiberoptic beam delivery. As laser power is very easily controlled, it is ensured that the criterion for single crystal solidification is maintained during the whole repair operation. As an additional consequence the boundaries that have been set by the vision system do not have to be rigorously kept. If the heat source 7 acts on zones without casting defects 5 the material will be also remolten and it will subsequently resolidify with its original orientation.
- the melting of whole areas of limited size can as well be achieved by parallel, partially overlapping laser remelting tracks, for example when repairing clusters of freckles in close proximity, wide slivers, and shallow equiaxed grains.
- the overlap is typically 30%-50%.
- the laser will be focussed to a spot size of 1-2mm diameter.
- the laser would be either of the Nd-YAG or high power diode laser type. These lasers operate in the near infrared and about 30-40% of the incident radiation is absorbed by typical super alloys.
- the laser beam will move at relatively slow speeds (approx. 1 -10 mm/s) over the affected zones and operate in the conduction welding mode.
- Laser intensities of 1 * 10 3 W/cm 2 to 5*10 4 W/cm 2 will remelt a zone reaching up to 500 ⁇ m below the surface. Larger penetration depths can be achieved by further reducing the processing speed or by preheating the article 1 prior to the melting of the casting defect 5 to a desired temperature in the range of 500 - 1000°C, e.g. with a high frequency generator. On preheated articles, however, thermal gradients are smaller and it is more difficult to meet the G V S criterion. On the other hand the risk of hot tearing defects during the repair operation is re- cuted.
- At least one of Plasma Transfer Arc Welding, Micro Plasma Welding, Tungsten Inert Gas Welding, Electron Beam Welding are any other suitable tool can be used.
- the welding can be carried out under an inert gas atmosphere, with inert gas shielding, or under vacuum to prevent excessive oxidation of the liquid alloy.
- the article can be prepared before the melting of the casting defects by stress relief heat treatments to tempera- tures close to the incipient melting point.
- additional material 8 can be added to the already molten area by means of a feeder 9 to ensure the monocrystalline structure of the underlying material.
- a feeder 9 to ensure the monocrystalline structure of the underlying material.
- material is added before the melting operation in the form of a preform solid, powder compress, paste or slurry and used to fill at least a portion of the defect that was remelted. Additional material can also be added when no portion of any defect has been removed. With advantage, additional material 8 with substantially the same composition as the article itself is fed to the locally melted area.
- the defect comprises essentially identical material compared to the rest of the article, so melting and re-solidifying epitaxially into the oriented microstructure of the article results in a structure substantially identical to that of a cast article that never had defects in the first place.
- the casting defect 5 is melted and re-solidified.
- a second melting operation is carried out while this time additional material is injected to the melt pool.
- this material will be machined away e.g. by machining or grinding. Still it is possible to remove by machining a portion of the casting defect before the method begins with the step of re- melting.
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP03702835A EP1478482B1 (en) | 2002-02-27 | 2003-02-04 | Method of removing casting defects |
AU2003205952A AU2003205952A1 (en) | 2002-02-27 | 2003-02-04 | Method of removing casting defects |
DE60305009T DE60305009T2 (en) | 2002-02-27 | 2003-02-04 | PROCESS FOR REMOVING MOLDING ERRORS |
US10/923,023 US7169242B2 (en) | 2002-02-27 | 2004-08-23 | Method of removing casting defects |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP02405142A EP1340567A1 (en) | 2002-02-27 | 2002-02-27 | Method of removing casting defects |
EP02405142.7 | 2002-02-27 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/923,023 Continuation US7169242B2 (en) | 2002-02-27 | 2004-08-23 | Method of removing casting defects |
Publications (3)
Publication Number | Publication Date |
---|---|
WO2003072284A2 true WO2003072284A2 (en) | 2003-09-04 |
WO2003072284A3 WO2003072284A3 (en) | 2003-11-13 |
WO2003072284A8 WO2003072284A8 (en) | 2004-10-07 |
Family
ID=27675797
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/IB2003/000362 WO2003072284A2 (en) | 2002-02-27 | 2003-02-04 | Method of removing casting defects |
Country Status (6)
Country | Link |
---|---|
US (1) | US7169242B2 (en) |
EP (2) | EP1340567A1 (en) |
CN (1) | CN100528410C (en) |
AU (1) | AU2003205952A1 (en) |
DE (1) | DE60305009T2 (en) |
WO (1) | WO2003072284A2 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7169242B2 (en) | 2002-02-27 | 2007-01-30 | Alstom Technology Ltd. | Method of removing casting defects |
Families Citing this family (42)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1426458B1 (en) * | 2002-12-06 | 2008-03-12 | ALSTOM Technology Ltd | Method of locally depositing a MCrAlY coating |
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US7763823B2 (en) * | 2004-10-29 | 2010-07-27 | United Technologies Corporation | Method and apparatus for microplasma spray coating a portion of a compressor blade in a gas turbine engine |
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EP1772228A1 (en) * | 2005-10-07 | 2007-04-11 | Siemens Aktiengesellschaft | Process for repairing a workpiece with an oriented microstructure |
US7784668B2 (en) | 2005-12-16 | 2010-08-31 | United Technologies Corporation | Repair method for propagating epitaxial crystalline structures by heating to within 0-100° f of the solidus |
DE102006026704A1 (en) * | 2006-06-08 | 2007-12-13 | Mtu Aero Engines Gmbh | Process for the manufacture or repair of turbine or engine components, and component, namely turbine or engine component |
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US20220212296A1 (en) * | 2019-07-30 | 2022-07-07 | Siemens Energy, Inc. | System and method for repairing high-temperature gas turbine blades |
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Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59152029A (en) * | 1983-02-15 | 1984-08-30 | Mitsubishi Heavy Ind Ltd | Method of repairing defected casting |
JPS60167723A (en) * | 1984-02-03 | 1985-08-31 | Mitsubishi Heavy Ind Ltd | Method of repairing casting defect |
US4705203A (en) * | 1986-08-04 | 1987-11-10 | United Technologies Corporation | Repair of surface defects in superalloy articles |
US4878953A (en) * | 1988-01-13 | 1989-11-07 | Metallurgical Industries, Inc. | Method of refurbishing cast gas turbine engine components and refurbished component |
US5193272A (en) * | 1990-12-13 | 1993-03-16 | Sulzer-Mtu Casting Technology Gmbh | Process for repair of drive blades such as turbine blades |
US5701669A (en) * | 1995-12-21 | 1997-12-30 | Mtu Motoren- Und Turbinen-Union Muenchen Gmbh | Repair method for lengthening turbine blades |
Family Cites Families (20)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3310423A (en) * | 1963-08-27 | 1967-03-21 | Metco Inc | Flame spraying employing laser heating |
US3690367A (en) * | 1968-07-05 | 1972-09-12 | Anadite Inc | Apparatus for the restructuring of metals |
US4714101A (en) * | 1981-04-02 | 1987-12-22 | United Technologies Corporation | Method and apparatus for epitaxial solidification |
CA1312506C (en) * | 1987-09-30 | 1993-01-12 | Atsuhisa Fujisawa | Method of remedying coating |
US4969501A (en) * | 1989-11-09 | 1990-11-13 | Pcc Airfoils, Inc. | Method and apparatus for use during casting |
CA2034370A1 (en) * | 1990-03-30 | 1991-10-01 | Peter W. Mueller | Process for identification evaluation and removal of microshrinkage |
US5312584A (en) * | 1992-02-18 | 1994-05-17 | General Motors Corporation | Moldless/coreless single crystal castings of nickel-aluminide |
DE59208497D1 (en) | 1992-03-02 | 1997-06-19 | Sulzer Innotec Ag | Free-form welding of metal structures with lasers |
US5914059A (en) * | 1995-05-01 | 1999-06-22 | United Technologies Corporation | Method of repairing metallic articles by energy beam deposition with reduced power density |
US5900170A (en) | 1995-05-01 | 1999-05-04 | United Technologies Corporation | Containerless method of producing crack free metallic articles by energy beam deposition with reduced power density |
DE19539770A1 (en) | 1995-06-20 | 1997-01-02 | Abb Research Ltd | Process for producing a directionally solidified casting and device for carrying out this process |
US5837960A (en) * | 1995-08-14 | 1998-11-17 | The Regents Of The University Of California | Laser production of articles from powders |
JP2000511233A (en) * | 1995-11-21 | 2000-08-29 | オプティカスト アクチボラゲット | An improved method for optimizing grain refinement of aluminum alloys |
EP0861927A1 (en) * | 1997-02-24 | 1998-09-02 | Sulzer Innotec Ag | Method for manufacturing single crystal structures |
US6615470B2 (en) * | 1997-12-15 | 2003-09-09 | General Electric Company | System and method for repairing cast articles |
US6084196A (en) * | 1998-02-25 | 2000-07-04 | General Electric Company | Elevated-temperature, plasma-transferred arc welding of nickel-base superalloy articles |
US6054672A (en) * | 1998-09-15 | 2000-04-25 | Chromalloy Gas Turbine Corporation | Laser welding superalloy articles |
DE19949972C1 (en) | 1999-10-11 | 2001-02-08 | Fraunhofer Ges Forschung | Process for the manufacture of molded bodies or for the application of coatings onto workpieces comprises building up a molded body in layers or applying a coating made up of at least two individual layers |
US7204019B2 (en) * | 2001-08-23 | 2007-04-17 | United Technologies Corporation | Method for repairing an apertured gas turbine component |
EP1340567A1 (en) | 2002-02-27 | 2003-09-03 | ALSTOM (Switzerland) Ltd | Method of removing casting defects |
-
2002
- 2002-02-27 EP EP02405142A patent/EP1340567A1/en not_active Withdrawn
-
2003
- 2003-02-04 WO PCT/IB2003/000362 patent/WO2003072284A2/en not_active Application Discontinuation
- 2003-02-04 EP EP03702835A patent/EP1478482B1/en not_active Expired - Lifetime
- 2003-02-04 AU AU2003205952A patent/AU2003205952A1/en not_active Abandoned
- 2003-02-04 CN CNB038047152A patent/CN100528410C/en not_active Expired - Fee Related
- 2003-02-04 DE DE60305009T patent/DE60305009T2/en not_active Expired - Lifetime
-
2004
- 2004-08-23 US US10/923,023 patent/US7169242B2/en not_active Expired - Fee Related
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59152029A (en) * | 1983-02-15 | 1984-08-30 | Mitsubishi Heavy Ind Ltd | Method of repairing defected casting |
JPS60167723A (en) * | 1984-02-03 | 1985-08-31 | Mitsubishi Heavy Ind Ltd | Method of repairing casting defect |
US4705203A (en) * | 1986-08-04 | 1987-11-10 | United Technologies Corporation | Repair of surface defects in superalloy articles |
US4878953A (en) * | 1988-01-13 | 1989-11-07 | Metallurgical Industries, Inc. | Method of refurbishing cast gas turbine engine components and refurbished component |
US5193272A (en) * | 1990-12-13 | 1993-03-16 | Sulzer-Mtu Casting Technology Gmbh | Process for repair of drive blades such as turbine blades |
US5701669A (en) * | 1995-12-21 | 1997-12-30 | Mtu Motoren- Und Turbinen-Union Muenchen Gmbh | Repair method for lengthening turbine blades |
Non-Patent Citations (2)
Title |
---|
PATENT ABSTRACTS OF JAPAN vol. 008, no. 284 (M-348), 26 December 1984 (1984-12-26) & JP 59 152029 A (MITSUBISHI JUKOGYO KK), 30 August 1984 (1984-08-30) * |
PATENT ABSTRACTS OF JAPAN vol. 010, no. 002 (M-444), 8 January 1986 (1986-01-08) & JP 60 167723 A (MITSUBISHI JUKOGYO KK), 31 August 1985 (1985-08-31) * |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7169242B2 (en) | 2002-02-27 | 2007-01-30 | Alstom Technology Ltd. | Method of removing casting defects |
Also Published As
Publication number | Publication date |
---|---|
EP1340567A1 (en) | 2003-09-03 |
DE60305009D1 (en) | 2006-06-08 |
WO2003072284A3 (en) | 2003-11-13 |
US20050067065A1 (en) | 2005-03-31 |
AU2003205952A1 (en) | 2003-09-09 |
EP1478482B1 (en) | 2006-05-03 |
US7169242B2 (en) | 2007-01-30 |
DE60305009T2 (en) | 2007-04-19 |
WO2003072284A8 (en) | 2004-10-07 |
CN1638897A (en) | 2005-07-13 |
EP1478482A2 (en) | 2004-11-24 |
CN100528410C (en) | 2009-08-19 |
AU2003205952A8 (en) | 2003-09-09 |
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