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EP1931498A1 - Procede de reparation d'un composant ayant une microstructure orientee - Google Patents

Procede de reparation d'un composant ayant une microstructure orientee

Info

Publication number
EP1931498A1
EP1931498A1 EP06793849A EP06793849A EP1931498A1 EP 1931498 A1 EP1931498 A1 EP 1931498A1 EP 06793849 A EP06793849 A EP 06793849A EP 06793849 A EP06793849 A EP 06793849A EP 1931498 A1 EP1931498 A1 EP 1931498A1
Authority
EP
European Patent Office
Prior art keywords
repair
filling
base material
crack
component
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.)
Withdrawn
Application number
EP06793849A
Other languages
German (de)
English (en)
Inventor
Rene Jabado
Jens Dahl Jensen
Ursus KRÜGER
Daniel Körtvelyessy
Michael Ott
Ralph Reiche
Michael Rindler
Rolf WILKENHÖNER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Original Assignee
Siemens AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Siemens AG filed Critical Siemens AG
Priority to EP06793849A priority Critical patent/EP1931498A1/fr
Publication of EP1931498A1 publication Critical patent/EP1931498A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • 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
    • 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
    • B23P6/04—Repairing fractures or cracked metal parts or products, e.g. castings
    • B23P6/045—Repairing fractures or cracked metal parts or products, e.g. castings of turbine components, e.g. moving or stationary blades, rotors, etc.
    • 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
    • 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
    • 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
    • F05D2230/00—Manufacture
    • F05D2230/30—Manufacture with deposition of material
    • 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
    • F05D2230/00—Manufacture
    • F05D2230/40—Heat treatment
    • 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
    • F05D2230/00—Manufacture
    • F05D2230/80—Repairing, retrofitting or upgrading methods
    • 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
    • F05D2300/605—Crystalline
    • 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
    • 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
    • F05D2300/607—Monocrystallinity
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/60—Efficient propulsion technologies, e.g. for aircraft

Definitions

  • the present invention relates to a method for repairing a component, in particular a gas turbine component, which is made of a base material with a directional microstructure.
  • Machine components which are subjected to high loads during operation are nowadays produced, among other things, from high-temperature superalloys and in particular from those with a directional microstructure. These materials are characterized by a high resistance to thermal and mechanical loads.
  • materials with directional microstructure particular monocrystalline materials and materials are to be regarded, which have a grain structure in which the expansion of the grains has a common direction common to all grains. Components with the described grain structure are referred to as directionally solidified.
  • the monocrystalline materials are also referred to as SX materials and the directionally solidified materials as DX materials.
  • a common method for repairing damaged components is, for example, the soldering.
  • soldering In this soldering, a solder is applied in the region of the crack on the material of the component and connected by means of heat to the base material. However, after soldering, the solder material does not have a monocrystalline or directionally solidified structure.
  • a non-directional microstructure has inferior material properties compared to a directional microstructure - especially in the high temperature region - so that the solder joint is a weak point of the component.
  • welding processes are available with which a directional microstructure can also be created in the welded areas. Such a method is disclosed, for example, in EP 0 892 090 A1.
  • EP 1 666 635 A1 discloses a method of repairing components made of a superalloy. Cold gas spraying is used to apply a repair material, which is plastically deformed when it hits the surface and bound to the surface of the superalloy.
  • solder applications for components of directionally oriented materials involves the risk of recrystallization during the heat treatment, since the solder application requires a temperature close to the melting point of the directionally oriented material.
  • solder alloys In solder processes for repairing components, the solder alloys generally contain melting point depressants. Often these are boron (B), which can lead to the formation of sputtering phases during heat treatment and later operation of the component under the influence of hot gases. The sputter phases worsen the mechanical properties of the repair site. In addition, for example, gas turbine blade solder repairs are lengthy processes that sometimes take longer than 24 hours and require multi-stage heat treatment. As a result, the repair costs are significantly increased. Furthermore, necessary for solder repairs
  • a second object of the present invention is to provide an improved method for repairing a component, in particular a turbine component, from a high-temperature superalloy.
  • the first object is achieved by a method for repairing a component according to claim 1
  • the second object by a method for repairing a component according to claim 10.
  • the dependent claims contain advantageous embodiments of the invention.
  • the method according to the invention for repairing a component made of a base material with a directional microstructure according to claim 1 comprises the steps of: cleaning the repair site, filling the repair site with a filler material corresponding to the composition of the base material and performing a heat treatment in the area of the filled repair site ,
  • the component to be repaired may in particular be a gas turbine component, for example a turbine blade.
  • the filling material has micro- and / or nanoscale particles.
  • measures are taken when filling the repair site, which prevent the oxidation of the filler.
  • the temperatures and holding times of the heat treatment are chosen such that the repair site has the same directional microstructure as the base material surrounding the repair site.
  • the directional microstructure can be brought about in particular by the fact that the temperature of the heat treatment is below the melting temperature of the
  • Base material is located and the cooling does not exceed a certain cooling rate. Too high a cooling rate would disturb the orderly growth and thus the formation of a directional microstructure in the repair site.
  • the respective temperatures to be respected and cooling rates depend u. a. from the base material so that they may be different for different base materials. Suitable cooling rates can be determined in particular empirically.
  • cracks in components made of directionally oriented materials can be structurally repaired in such a way that the repair point has the same direction. has a microstructure and without the properties of the surrounding base material are adversely affected. Due to the use of micro- and / or nanoscale particles, the melting temperature of the filling material is reduced relative to the melting temperature of the surrounding base material.
  • the heat treatment can therefore be carried out at temperatures which are lower than the temperatures in a soldering process. Also fall locally not as high amounts of heat, as in the welding process described above.
  • a spraying process can be used, which allows a low temperature of the sprayed particles. It is conceivable, for example, to use a low-temperature high-speed flame spraying process, as described, for example, in DE 102 53 794 A1. Preferably, however, a cold gas injection process, as described, for example, in DE 102 24 780 A1, is used to fill the repair site. In the case of low-temperature flame spraying, the oxidation of the sprayed particles can be largely suppressed. With cold gas spraying, in which spray particles are accelerated from a "cold" gas jet to high velocities, an even greater suppression of the oxidation is possible, so that virtually no oxidation of the sprayed particles takes place.
  • the particles are in an advantageous embodiment of the invention when filling the repair site surrounded by a shell.
  • the shell which may be constructed of a material component of the base material, for example nickel or cobalt, increases the dimension of the particles. Due to the increased size, the particles can be better entrained and accelerated by the cold gas flow. The kinetic energy converted into heat when hitting the walls of the filling station leads to a melting of the filling material.
  • those areas To protect those who surround the repair site, they can be covered during filling with a panel.
  • the filling material is present in the form of at least two constituents which have a eutectic mixing ratio.
  • a eutectic mixing ratio is a mixing ratio which results in only mixed crystals forming from a melt of the material composition on cooling.
  • a mixing ratio deviating from the eutectic mixing ratio leads to the formation on cooling of pure crystals of the two constituents of the material.
  • the eutectic mixing ratio is characterized by the fact that it has the lowest melting temperature of all mixing ratios of the two
  • the cleaning process before filling the repair site should preferably be such that any oxides present are completely removed from the site to be repaired.
  • the crack ends can be filled during the repair of cracks in the base material of a component. Filling the crack ends is not readily possible with larger particles. The filling of the crack ends but is of great importance, since by the
  • the volume of the cracks may also be greater than the size of the micro- and / or nanoscale particles.
  • an application of a coating takes place according to application 10 Repair material by spraying the repair material in the form of powder particles by means of cold gas spraying.
  • the repair material has a higher ductility than the high-temperature superalloy.
  • repair materials more ductile materials are proposed as the base material. These may in particular be materials which are already being used for repairs, in particular welding repairs, or they may be gamma-hardened superalloys. The latter are a good compromise between reduced strength and improved weldability compared to the base material. Further, as the repair materials, such Ni superalloys as Wrought Alloys are used because they have a much higher ductility compared to the currently used Ni cast superalloys for gas turbine blades (cast alloys). It is also possible to use materials as repair materials that are currently used for soldering repairs. However, it is possible to dispense with the addition or addition of melting point depressants, since the filler material is not melted during the cold gas repair.
  • the filler used as a repair material is applied cold.
  • the powdery filler material is only warmed up in the preheated gas stream, but not melted.
  • the component itself remains cold. Therefore, no hot cracks occur.
  • Base material is neither dissolved nor coarsened. Therefore, there can be no Strain Age Cracking cracks in the Base material arise. The risk of such cracks occurring in the weld metal when using ⁇ '-hardened filler materials is also substantially reduced.
  • connection heat treatment for example, 1000-1100 0 C for 10 min to 2 h
  • the component must then be completely heat-treated (low-loss and outsourcing), but this is usually also required after welding and solder repairs.
  • the particle velocities can be below about 900 m / s and in particular below 800 m / s.
  • the repair material can hide the site to be repaired done. In other words, material is removed in the area of the repair site, so that an easy-to-fill recess arises where the damage was. The missing material can then be subsequently applied by means of cold gas spraying.
  • damage such as cracks
  • the repair site first is cleaned, for example by fluoride ion cleaning, to remove surface contaminants such as oxides. Such contaminants would affect the bond between the base material and the repair material.
  • the entire crack may not be filled in the direct filling of cracks, but the crack only covers, which may be acceptable under certain circumstances.
  • a material which contains nanoscale powder particles which are surrounded by a shell of nanoscale particles can be used as powder material.
  • FIG. 1 shows by way of example a gas turbine in a longitudinal partial section
  • Figure 2 shows a perspective view of a blade or vane of a turbomachine
  • FIG. 3 shows a combustion chamber of a gas turbine
  • Figure 4 shows a schematic representation of a section of a turbine blade with a crack
  • Figure 5 shows a schematic representation of the crack in a sectional side view
  • FIG. 6 shows the filling of the crack from FIG. 5
  • Figure 7 shows the filled crack after performing a heat treatment
  • Figure 8 shows a particle agglomerate as used to fill the crack
  • Figures 9 to 11 show a further embodiment of the inventive method for repairing a
  • Figures 12 to 14 show a third embodiment of the inventive method for repairing a component.
  • FIG. 1 shows by way of example a gas turbine 100 in a longitudinal partial section.
  • the gas turbine 100 has inside a rotatably mounted about a rotation axis 102 rotor 103, which is also referred to as a turbine runner.
  • a compressor 105 for example, a toroidal combustion chamber 110, in particular annular combustion chamber 106, with a plurality of coaxially arranged burners 107, a turbine 108 and the exhaust housing 109th
  • the annular combustion chamber 106 communicates with an annular annular hot gas channel 111, for example.
  • annular annular hot gas channel 111 for example.
  • turbine stages 112 connected in series form the turbine 108.
  • Each turbine stage 112 is formed, for example, from two blade rings. As seen in the direction of flow of a working medium 113, in the hot gas channel 111 of a row of guide vanes 115, a series 125 formed of rotor blades 120 follows.
  • the guide vanes 130 are fastened to an inner housing 138 of a stator 143, whereas the moving blades 120 of a row 125 are attached to the rotor 103 by means of a turbine disk 133, for example.
  • Coupled to the rotor 103 is a generator or work machine (not shown).
  • air 105 is sucked in and compressed by the compressor 105 through the intake housing 104.
  • the compressed air provided at the turbine-side end of the compressor 105 is fed to the burners 107 where it is mixed with a fuel.
  • the mixture is then burned to form the working fluid 113 in the combustion chamber 110.
  • the working medium 113 flows along the hot gas channel 111 past the guide vanes 130 and the rotor blades 120.
  • the working medium 113 expands on the rotor blades 120 in a pulse-transmitting manner, so that the rotor blades 120 drive the rotor 103 and drive the machine coupled to it ,
  • the components exposed to the hot working medium 113 are subject to thermal loads during operation of the gas turbine 100.
  • the guide vanes 130 and rotor blades 120 of the first turbine stage 112, viewed in the direction of flow of the working medium 113, are subjected to the highest thermal stress in addition to the heat shield bricks lining the annular combustion chamber 106.
  • substrates of the components may have a directional structure, i. they are monocrystalline (SX structure) or have only longitudinal grains (DS structure).
  • Iron, nickel or cobalt-based superalloys are used as material for the components, in particular for the turbine blades 120, 130 and components of the combustion chamber 110.
  • Such superalloys are known, for example, from EP 1 204 776 B1, EP 1 306 454, EP 1 319 729 A1, WO 99/67435 or WO 00/44949; these writings are part of the revelation.
  • blades 120, 130 may be anti-corrosion coatings (MCrAlX; M is at least one member of the group Iron (Fe), cobalt (Co), nickel (Ni), X is an active element and stands for yttrium (Y) and / or silicon and / or at least one element of the rare earths or hafnium).
  • M is at least one member of the group Iron (Fe), cobalt (Co), nickel (Ni)
  • X is an active element and stands for yttrium (Y) and / or silicon and / or at least one element of the rare earths or hafnium).
  • Such alloys are known from EP 0 486 489 B1, EP 0 786 017 Bl, EP 0 412 397 B1 or EP 1 306 454 A1, which are intended to be part of this disclosure.
  • a thermal barrier coating may still be present, consisting for example of ZrC> 2, Y2 ⁇ 3-ZrC> 2, i. it is not, partially or completely stabilized by yttrium oxide and / or calcium oxide and / or magnesium oxide.
  • suitable coating methods e.g. Electron beam evaporation (EB-PVD) produces stalk-shaped grains in the thermal barrier coating.
  • the vane 130 has a guide vane foot (not shown here) facing the inner housing 138 of the turbine 108 and a vane head opposite the vane foot.
  • the vane head faces the rotor 103 and fixed to a mounting ring 140 of the stator 143.
  • FIG. 2 shows a perspective view of a moving blade 120 or guide blade 130 of a turbomachine that extends along a longitudinal axis 121.
  • the turbomachine may be a gas turbine of an aircraft or a power plant for power generation, a steam turbine or a compressor.
  • the blade 120, 130 has along the longitudinal axis 121 consecutively a fastening region 400, a blade platform 403 adjoining thereto and an airfoil 406.
  • the blade 130 may have at its blade tip 415 another platform (not shown).
  • a blade root 183 is formed, which serves for attachment of the blades 120, 130 to a shaft or a disc (not shown).
  • the blade root 183 is designed, for example, as a hammer head. Other designs as Christmas tree or Schwalbenschwanzfuß are possible.
  • the blade 120, 130 has a flow-on edge 409 and a downstream edge 412 for a medium that flows past the blade 406.
  • blades 120, 130 for example, solid metallic materials, in particular superalloys, are used in all regions 400, 403, 406 of the blade 120, 130.
  • superalloys are known, for example, from EP 1204776 Bl, EP 1306454, EP 1319729 A1, WO 99/67435 or WO 00/44949; these writings are part of the revelation.
  • the blade 120, 130 can be made by a casting process, also by directional solidification, by a forging process, by a Fras vide or combinations thereof.
  • Single-crystalline structures or structures are used as components for machines that are subject to high mechanical, thermal and / or chemical stresses during operation.
  • the production of such monocrystalline workpieces for example, by directed solidification from the melt.
  • These are casting processes in which the liquid metallic alloy solidifies to a monocrystalline structure, ie to a single-crystalline workpiece, or directionally.
  • dendritic crystals are aligned along the warm flow and form either a crystal grain structure (columnar, ie grains that run the entire length of the work piece and here, according to general usage, are referred to as directionally solidified) or a monocrystalline structure ie the whole work consists of a single crystal.
  • Structures are also called directionally solidified structures. Such methods are known from US Pat. No. 6,024,792 and EP 0 892 090 A1; these writings are part of the revelation.
  • the blades 120, 130 may be coatings against corrosion or oxidation (MCrAlX; M is at least one element of the group iron (Fe), cobalt (Co), nickel (Ni), X is an active element and is yttrium (Y) and / or silicon and / or at least one element of the rare earths, or hafnium (Hf)).
  • M is at least one element of the group iron (Fe), cobalt (Co), nickel (Ni)
  • X is an active element and is yttrium (Y) and / or silicon and / or at least one element of the rare earths, or hafnium (Hf)).
  • Such alloys are known from EP 0 486 489 B1, EP 0 786 017 Bl, EP 0 412 397 B1 or EP 1 306 454 A1, which are intended to be part of this disclosure.
  • thermal barrier coating On the MCrAlX may still be present a thermal barrier coating and consists for example of ZrÜ2, Y2Ü3-Zr ⁇ 2, i. it is not, partially or completely stabilized by yttrium oxide and / or calcium oxide and / or magnesium oxide.
  • suitable coating methods e.g. Electron beam evaporation (EB-PVD) produces stalk-shaped grains in the thermal barrier coating.
  • Refurbishment means that components 120, 130 may have to be freed from protective layers after use (eg by sandblasting). This is followed by removal of the corrosion and / or oxidation layers or products. Optionally, even cracks in the component 120, 130 are repaired. Thereafter, a the coating of the component 120, 130 and a renewed use of the component 120, 130.
  • the blade 120, 130 may be hollow or solid. If the blade 120, 130 is to be cooled, it is hollow and may still film cooling holes 418 (indicated by dashed lines) on.
  • FIG. 3 shows a combustion chamber 110 of a gas turbine.
  • the combustion chamber 110 is designed, for example, as a so-called annular combustion chamber, in which a multiplicity of burners 107 arranged around the rotation axis 102 in the circumferential direction open into a common combustion chamber space.
  • the combustion chamber 110 is configured in its entirety as an annular structure, which is positioned around the axis of rotation 102 around.
  • the combustion chamber 110 is designed for a comparatively high temperature of the working medium M of about 1000 ° C. to 1600 ° C.
  • the combustion chamber wall 153 is provided on its side facing the working medium M side with an inner lining formed from heat shield elements 155.
  • Each heat shield element 155 is equipped on the working medium side with a particularly heat-resistant protective layer or made of high-temperature-resistant material. These may be solid ceramic stones or alloys with MCrAlX and / or ceramic coatings. The materials of the combustion chamber wall and its coatings may be similar to the turbine blades.
  • the combustion chamber 110 may also be provided for the heat shield elements 155 and for their holding elements, a cooling system.
  • the combustion chamber 110 is designed in particular for detecting losses of the heat shield elements 155.
  • a number of temperature sensors 158 are positioned between the combustion chamber wall 153 and the heat shield elements 155.
  • FIG. 4 shows, in a highly schematized view, a section of the blade leaf 406 with a branched crack 420.
  • the blade leaf 406 is produced from a monocrystalline nickel-based alloy. In principle, however, it is also possible to repair components made of other monocrystalline base alloys, for example cobalt-base alloys or iron-based alloys, using the method according to the invention.
  • the crack 420 has a number of crack ends 422, in the vicinity of which particularly high stresses are present in the monocrystalline base material. The stresses may lead to further expansion of the crack 420. It is therefore particularly important to prevent the progress of the crack in the area of the crack ends 422.
  • a repair of the turbine blade 406 can be carried out by filling the crack 420 with a material similar to the base material and bonding it to the base material by means of a suitable heat treatment. In particular, if this happens in the area of the crack ends 422, further expansion of the crack is effectively prevented and the repaired turbine blade 406 can be put back into operation.
  • the fill of the crack 420 should have the same single crystalline structure as the surrounding base material. This can be achieved with the repair method described below.
  • FIG. 5 shows a schematic representation of a
  • Section of the turbine blade 406. The section is taken along the line AA in Figure 4.
  • the figure shows the crack 420 before filling and after cleaning, with all Oxides have been removed from the crack walls.
  • the crack cleaning can be done by common cleaning methods. Alternatively, it is also possible to widen the crack 420 by means of an erosion pin.
  • the cleaned crack 420 is filled with a material similar to the base material filling material.
  • the filling process is shown schematically in FIG. 6.
  • the base material is a nickel-base alloy containing, among others, aluminum as an additive.
  • As a filler nanoscale particles are used, which are injected by means of a cold gas spray gun 426 in the crack 420.
  • the nanoscale particles which have a particle size of less than 5 ⁇ m and preferably less than 1 ⁇ m, by means of the cold gas injection method, they are combined with other particles to form agglomerates 425.
  • the agglomerates then have the necessary cross-section to flow from the cold gas stream, for example a helium stream, into
  • the agglomerate 425 in the present embodiment comprises a central nanoscale aluminum particle 425a, around which nanoscale nickel particles 425b are deposited.
  • the cohesion of the agglomerate is caused by electrostatic forces.
  • the nickel particles 425b form a shell around the aluminum particle 425a, so that the diameter of the agglomerate is at least 5 ⁇ m.
  • the cross section of the agglomerate is then large enough to be entrained by the helium stream.
  • agglomerate 425 disintegrates.
  • the composition of the agglomerates 425 ie the ratio of shell particle number to a central particle, is selected so that the filler is present in a eutectic mixture.
  • the filler material forms a mixed crystal during the heat treatment.
  • the melting temperature of a eutectic mixture is the lowest possible melting temperature of the mixture compared to a mixture with the same ingredients but different mixing ratios. Therefore, if the filler contains the same constituents as the surrounding base material and is in a eutectic mixing ratio, its melting temperature is particularly far below the melting temperature of the surrounding base material.
  • the described method can be used in particular to fill the crack 420 in the region of the ends 422 in such a way that the monocrystalline structure of the surrounding base material is continued. In this way, the stresses in the base material in the region of the crack ends 422 can be significantly reduced, so that a progression of the crack 420 can be effectively prevented. The remaining areas of the crack can then be filled with coarser than nanoscale particles with which not readily the monocrystalline
  • Structure of the base material can be continued. It is important in this context, above all, that the crack ends 422 can be reliably filled by means of the nanoscale particles.
  • FIG. 9 shows, in a highly schematic sectional view, a section of an airfoil 506 with a crack 520.
  • the airfoil 506 is made of a nickel-based alloy with a polycrystalline crystal structure.
  • other base alloys for example cobalt or iron-based alloys, can also be repaired by the method according to the invention.
  • the component to be repaired may also have a monocrystalline base material or a directionally solidified base material.
  • the crack is widened, for example by means of an erosion pin, whereby also contaminants in the area of the crack wall are removed. The widening creates a recess 522 in the component 506 where the crack 520 was located. This recess 522 is then filled with a repair material.
  • FIG. 5 The filling of the recess 522 with the repair material is shown schematically in FIG.
  • the figure shows next to the blade 506 and the recess 522, the nozzle 526 a Cold gas spraying device and repair material 529, which is injected by means of the cold gas spraying device in the form of powder 528 in the recess 522.
  • the repair material As a shaped repair material, a material is used which has a higher ductility than the base material of the airfoil 506. In other words, the repair material tends under the action of external forces to plastic and thus permanent deformations without causing material separations occur. Ductile substances are especially good cold formability.
  • the repair material may be a material used in the prior art for repair by means of welding. Examples of these are nickel base alloys with high ductility and weldability, such as alloys known as IN 617, Haste Alloy X, Coat Metal CM64, PWA 795. Alternatively, ⁇ '-hardened superalloys can also be used as a repair material.
  • ⁇ '-hardened superalloys grains of ⁇ ' phase are present in a ⁇ -phase, which has a cubic body-centered lattice structure.
  • the grains of ⁇ 'phase lead to a hardening of the superalloy material.
  • Suitable ⁇ '-hardened superalloys as coating material are, for example, materials known by the name Nimonic C263, Rene 41,
  • Haynes 282 are known. These represent a good compromise between reduced strength and improved weldability compared to the base material. The improved weldability results from the increased ductility compared to the base material. As another
  • repair materials such nickel superalloys can be used, which are considered as wrought alloys, as they have a much higher ductility compared to the commonly used cast iron superalloys for gas turbine blades (so-called cast alloys).
  • repair materials can be used, as they are currently used for soldering repairs.
  • melting point depressants such as in particular boron (B), but also eg zirconium (Zr), hafnium (Hf), scandium (Sc), platinum (Pt) or palladium (Pd)
  • the sprayed 528 of the repair material by means of the nozzle 526 is compacted by cold deformation when hitting the surface of the recess 522. Due to the cold deformation and in addition to adhesion, the sprayed powder adheres to the surface of the recess 522. These mechanisms work the better the more ductile the repair material used is. By means of the cold gas spraying of ductile repair materials, therefore, a dense and well adhering layer is produced in the recess 522.
  • the spraying of the powder 528 takes place in the preheated helium stream. The powder is only warmed up in it, but not melted. The component 506 itself remains cold, ie usually below 300 0 C, so no hot cracks occur.
  • the preheated helium may have temperatures in the range of 500 0 C to 700 0 C. Instead of helium, another inert gas, for example nitrogen, can be used for cold gas spraying.
  • the particle velocities in the sprayed powder material are about 900 m / sec or less, in particular less than about 800 m / s. Due to the relatively low
  • Particle velocities may find use with nozzles 526 having relatively large nozzle diameters, which results in an increase in coating speed compared to
  • the airfoil after spraying the repair material is shown in FIG. 11.
  • the repair material injected into the recess 522 forms a tight and well-adhering insert 530 in the recess, which also has a smooth surface.
  • a heat treatment of the complete component for example a solution annealing, can take place.
  • FIG. 12 shows an airfoil 606 with a crack 620, which corresponds to the airfoil 506 from FIG. 9.
  • the crack walls Prior to filling the crack 620, the crack walls are cleaned to remove oxides. The crack cleaning can be done by common cleaning methods.
  • the crack 620 is filled with a repair material having a higher ductility than the base material of the airfoil 606.
  • the repair material is injected into the crack 620 in the form of a powder 628 by means of the nozzle 626 of a cold gas injection device.
  • the surface of the member 606 in the area outside the crack 620 was covered by a mask 630 to suppress adhesion of the repair material to this area.
  • the repair material After the repair material has been injected into the crack, it forms a dense insert 632 which adheres well to the base material of the airfoil 606 and also has a smooth surface.
  • the powder used 628 it may be that not the entire crack is filled, but the crack is only capped. In other words, in areas of the crack, which have particularly small dimensions, the powder may not penetrate. However, such a capping of the crack can be tolerated in some cases.
  • nanoscale particles as a repair material. Since particles smaller than 5 ⁇ m in size, and preferably smaller than 1 ⁇ m in size, can not readily be sprayed by cold gas spraying, the particles can be sprayed in the form of agglomerates as described with reference to FIG. 8. A central particle then has a shell surrounding the central particle so that the agglomerate has a dimension of at least 5 ⁇ m. When hitting the surface of the crack or repair material already in the crack, the agglomerates break up due to the relatively weak bond between the particles, so that the individual nanoscale particles are then present separately.
  • composition of the agglomerates is chosen to correspond to an alloy having a higher ductility than the base alloy of the blade 606.
  • such particle agglomerates can be sprayed by means of the cold gas spraying method.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • General Engineering & Computer Science (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

L'invention concerne un procédé de réparation d'un composant (406), notamment d'un composant turbine à gaz qui est réalisé dans un matériau de base ayant une microstructure orientée. Ce procédé consiste à nettoyer la zone à réparer (420) ; à remplir la zone à réparer (420) d'un matériau de remplissage correspondant à la composition du matériau de base ; à effectuer un traitement thermique au niveau de la zone à réparer (420) remplie, ce matériau de remplissage présentant des particules (425a, 425b) micrométriques et/ou nanométriques. Lors du remplissage de la zone à réparer (420), on prend des mesures qui empêchent l'oxydation du matériau de remplissage et on adapte les températures et temps de maintien du traitement thermique à la composition du matériau de remplissage et du matériau de base du composant (406) de manière à obtenir une liaison épitaxique du matériau de remplissage au matériau de base environnant.
EP06793849A 2005-10-07 2006-09-27 Procede de reparation d'un composant ayant une microstructure orientee Withdrawn EP1931498A1 (fr)

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EP06793849A EP1931498A1 (fr) 2005-10-07 2006-09-27 Procede de reparation d'un composant ayant une microstructure orientee

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Application Number Priority Date Filing Date Title
EP05021898A EP1772228A1 (fr) 2005-10-07 2005-10-07 Procédé pour la réparation d'une pièce à microstructure orientée.
PCT/EP2006/066779 WO2007042395A1 (fr) 2005-10-07 2006-09-27 Procede de reparation d'un composant ayant une microstructure orientee
EP06793849A EP1931498A1 (fr) 2005-10-07 2006-09-27 Procede de reparation d'un composant ayant une microstructure orientee

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EP06793849A Withdrawn EP1931498A1 (fr) 2005-10-07 2006-09-27 Procede de reparation d'un composant ayant une microstructure orientee

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EP (2) EP1772228A1 (fr)
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Also Published As

Publication number Publication date
CN101277782A (zh) 2008-10-01
CN101277782B (zh) 2010-11-17
US20090297701A1 (en) 2009-12-03
WO2007042395A1 (fr) 2007-04-19
CN102029499A (zh) 2011-04-27
EP1772228A1 (fr) 2007-04-11

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