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US20090193656A1 - Steam turbine bucket with erosion durability - Google Patents

Steam turbine bucket with erosion durability Download PDF

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Publication number
US20090193656A1
US20090193656A1 US12/025,306 US2530608A US2009193656A1 US 20090193656 A1 US20090193656 A1 US 20090193656A1 US 2530608 A US2530608 A US 2530608A US 2009193656 A1 US2009193656 A1 US 2009193656A1
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US
United States
Prior art keywords
erosion
bucket
resistant material
leading edge
airfoil
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.)
Abandoned
Application number
US12/025,306
Inventor
Lyle B. Spiegel
Alan Richard DeMania
Qingxuan Michael Zhang
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.)
General Electric Co
Original Assignee
General Electric Co
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 General Electric Co filed Critical General Electric Co
Priority to US12/025,306 priority Critical patent/US20090193656A1/en
Assigned to GENERAL ELECTRIC COMPANY reassignment GENERAL ELECTRIC COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ZHANG, QINGXUAN MICHAEL, DEMANIA, ALAN RICHARD, SPIEGEL, LYLE B.
Priority to JP2009017850A priority patent/JP2009185814A/en
Priority to EP09151744A priority patent/EP2085573A3/en
Priority to CNA2009100057920A priority patent/CN101503967A/en
Publication of US20090193656A1 publication Critical patent/US20090193656A1/en
Abandoned legal-status Critical Current

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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
    • 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
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/20—Bonding
    • B23K26/32—Bonding taking account of the properties of the material involved
    • 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
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/34—Laser welding for purposes other than joining
    • 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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/30—Selection of soldering or welding materials proper with the principal constituent melting at less than 1550 degrees C
    • B23K35/3046—Co as the principal constituent
    • 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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/22—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by the composition or nature of the material
    • B23K35/24—Selection of soldering or welding materials proper
    • B23K35/32—Selection of soldering or welding materials proper with the principal constituent melting at more than 1550 degrees C
    • B23K35/327—Selection of soldering or welding materials proper with the principal constituent melting at more than 1550 degrees C comprising refractory compounds, e.g. carbides
    • 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
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/04—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass turbine or like blades from several pieces
    • 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
    • F01D5/12—Blades
    • F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
    • F01D5/286—Particular treatment of blades, e.g. to increase durability or resistance against corrosion or erosion
    • 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
    • F01D5/12—Blades
    • F01D5/28—Selecting particular materials; Particular measures relating thereto; Measures against erosion or corrosion
    • F01D5/288—Protective coatings for blades
    • 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
    • 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
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/08—Non-ferrous metals or alloys
    • 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
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/08—Non-ferrous metals or alloys
    • B23K2103/14—Titanium or alloys thereof
    • 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
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/18—Dissimilar materials
    • 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
    • B23K2103/00—Materials to be soldered, welded or cut
    • B23K2103/18—Dissimilar materials
    • B23K2103/26—Alloys of Nickel and Cobalt and Chromium
    • 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
    • B23K35/00—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting
    • B23K35/02—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape
    • B23K35/0222—Rods, electrodes, materials, or media, for use in soldering, welding, or cutting characterised by mechanical features, e.g. shape for use in soldering, brazing
    • B23K35/0244—Powders, particles or spheres; Preforms made therefrom
    • 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
    • F05D2230/90—Coating; Surface 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
    • F05D2300/00—Materials; Properties thereof
    • F05D2300/10—Metals, alloys or intermetallic compounds
    • F05D2300/13—Refractory metals, i.e. Ti, V, Cr, Zr, Nb, Mo, Hf, Ta, W
    • 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
    • F05D2300/611—Coating
    • 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
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49316—Impeller making
    • Y10T29/49336—Blade making
    • Y10T29/49337—Composite blade

Definitions

  • the subject invention relates to steam turbines. More particularly, the invention relates to erosion protection of steam turbine last stage buckets.
  • Last stage buckets of steam turbines can be exposed to a volatile environment where airfoils, particularly the leading edges of the airfoils, of the bucket are eroded due to moisture.
  • one method of increasing the durability and erosion resistance of the bucket involves fixing inserts formed from an erosion resistant material, such as cobalt-based stellite, to the leading edges of the bucket airfoils. This method includes precision machining of an insert to match the bucket airfoil, and then fixing the insert to the bucket via electron-beam welding.
  • This method does not allow the material composition of the insert to be easily adjusted to, for example, increase the alloy composition of the insert, or to add refractory metals such as chromium, molybdenum, tungsten, nickel, tantalum, and/or vanadium as well as refractory metal carbides to further enhance durability and erosion resistance.
  • refractory metals such as chromium, molybdenum, tungsten, nickel, tantalum, and/or vanadium as well as refractory metal carbides to further enhance durability and erosion resistance.
  • the electron-beam welding process currently utilized is costly and time-consuming, and must be performed in a vacuum environment. The use of the vacuum environment limits the opportunity to utilize shielding gases for the purpose of controlling the chemistry of the final alloy. Additionally, the electron-beam welding process cannot be utilized to weld a stellite insert to a bucket whose parent alloy is titanium based.
  • a method for forming a bucket for a steam turbine includes forming a leading edge on at least one airfoil.
  • the leading edge is comprised of an erosion resistant material and is bonded to the airfoil.
  • FIG. 1 is a partial perspective view of an embodiment of a last stage bucket
  • FIG. 2 is a partial cross-sectional view of an embodiment of an airfoil of the last stage bucket of FIG. 1 ;
  • FIG. 3 is a detail view of one method for forming a leading edge of the airfoil of FIG. 2 .
  • FIG. 1 depicts an embodiment of a steam turbine bucket 10 having a plurality of airfoils 12 .
  • the each airfoil 12 includes a forward face 14 at a forward end 16 of each airfoil 12 .
  • a leading edge 18 is formed at the forward face 14 from a deposition of a powdered material that is bonded, for example by fusion bonding, to the forward face 14 .
  • the material is typically a cobalt-based stellite alloy, which is chosen because it is erosion resistant and enhances the durability of the bucket 10 .
  • the material in one embodiment, is deposited, and a laser cladding process achieves the fusion bond.
  • powdered material 20 is ejected from one or more nozzles 22 toward a laser beam 24 .
  • the laser beam 24 is directed toward a melt pool 26 portion of the forward face 14 .
  • the powdered material 20 interacts with the laser beam 24 and melts in the melt pool 26 .
  • the laser beam 24 is then moved, thus moving the melt pool 26 . This allows the deposited material in the melt pool 26 to solidify and adhere to the forward face 14 .
  • the process is repeated until a clad layer 28 is formed on the forward face 14 .
  • a build up of a plurality of clad layers 28 may be utilized, with each layer 28 adhering to previous layers 28 .
  • the process as described above can be repeated to form the plurality of clad layers 28 which adhere to one another resulting in the leading edge shape 18 with a substantial multi-layer thickness of deposited material, as contrasted with a single coating layer over a substrate leading edge 18 .
  • the powdered material may be deposited on the forward face 14 by laser gas nitriding.
  • Utilization of the laser cladding process allows the material deposited on the forward face 14 to be adjusted as needed.
  • the composition of the material may be enhanced as needed to provide a desired combination of metallurgical properties by adding various alloying elements into the stellite alloy material.
  • additional alloying elements may include, for example, refractory metals such as chromium, molybdenum, tungsten, nickel, tantalum, and/or vanadium as well as refractory metal carbides in desired proportions to enhance resistance to heat, wear, and/or corrosion of the deposited material. It is to be appreciated that elements other than those listed above may be added to the stellite material and still be within the scope of the invention.
  • composition of the deposited material can be modified for particular a particular operating environment or for a particular bucket material.
  • a material deposit that results in a cobalt-free leading edge 18 with enhanced erosion resistance can be provided.
  • a material deposit that is base-matched to titanium can be provided when an erosion resistant leading edge 18 is desired for a bucket 10 formed of a titanium-based alloy.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • General Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Laser Beam Processing (AREA)
  • Other Surface Treatments For Metallic Materials (AREA)

Abstract

A method for forming a bucket for a steam turbine includes forming a leading edge on at least one airfoil. The leading edge is comprised of an erosion resistant material and is bonded to the airfoil.

Description

    BACKGROUND
  • The subject invention relates to steam turbines. More particularly, the invention relates to erosion protection of steam turbine last stage buckets.
  • Last stage buckets of steam turbines can be exposed to a volatile environment where airfoils, particularly the leading edges of the airfoils, of the bucket are eroded due to moisture. Currently, one method of increasing the durability and erosion resistance of the bucket involves fixing inserts formed from an erosion resistant material, such as cobalt-based stellite, to the leading edges of the bucket airfoils. This method includes precision machining of an insert to match the bucket airfoil, and then fixing the insert to the bucket via electron-beam welding.
  • This method does not allow the material composition of the insert to be easily adjusted to, for example, increase the alloy composition of the insert, or to add refractory metals such as chromium, molybdenum, tungsten, nickel, tantalum, and/or vanadium as well as refractory metal carbides to further enhance durability and erosion resistance. Further, the electron-beam welding process currently utilized is costly and time-consuming, and must be performed in a vacuum environment. The use of the vacuum environment limits the opportunity to utilize shielding gases for the purpose of controlling the chemistry of the final alloy. Additionally, the electron-beam welding process cannot be utilized to weld a stellite insert to a bucket whose parent alloy is titanium based.
    • BRIEF DESCRIPTION OF THE INVENTION
  • A method for forming a bucket for a steam turbine includes forming a leading edge on at least one airfoil. The leading edge is comprised of an erosion resistant material and is bonded to the airfoil.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • The subject matter which is regarded as the invention is particularly pointed out and distinctly claimed in the claims at the conclusion of the specification. The foregoing and other objects, features, and advantages of the invention are apparent from the following detailed description taken in conjunction with the accompanying drawings in which:
  • FIG. 1 is a partial perspective view of an embodiment of a last stage bucket;
  • FIG. 2 is a partial cross-sectional view of an embodiment of an airfoil of the last stage bucket of FIG. 1; and
  • FIG. 3 is a detail view of one method for forming a leading edge of the airfoil of FIG. 2.
    •
  • The detailed description explains embodiments of the invention, together with advantages and features, by way of example with reference to the drawing.
    • DETAILED DESCRIPTION
  • FIG. 1 depicts an embodiment of a steam turbine bucket 10 having a plurality of airfoils 12. In some embodiments, as shown in FIG. 2, the each airfoil 12 includes a forward face 14 at a forward end 16 of each airfoil 12. A leading edge 18 is formed at the forward face 14 from a deposition of a powdered material that is bonded, for example by fusion bonding, to the forward face 14. The material is typically a cobalt-based stellite alloy, which is chosen because it is erosion resistant and enhances the durability of the bucket 10.
  • The material, in one embodiment, is deposited, and a laser cladding process achieves the fusion bond. As illustrated in FIG. 3, in the laser cladding process, powdered material 20 is ejected from one or more nozzles 22 toward a laser beam 24. The laser beam 24 is directed toward a melt pool 26 portion of the forward face 14. The powdered material 20 interacts with the laser beam 24 and melts in the melt pool 26. The laser beam 24 is then moved, thus moving the melt pool 26. This allows the deposited material in the melt pool 26 to solidify and adhere to the forward face 14. The process is repeated until a clad layer 28 is formed on the forward face 14. To cover the forward face 14 and create the desired leading edge 18 shape, a build up of a plurality of clad layers 28 may be utilized, with each layer 28 adhering to previous layers 28. The process as described above can be repeated to form the plurality of clad layers 28 which adhere to one another resulting in the leading edge shape 18 with a substantial multi-layer thickness of deposited material, as contrasted with a single coating layer over a substrate leading edge 18. In another embodiment, the powdered material may be deposited on the forward face 14 by laser gas nitriding.
  • Utilization of the laser cladding process allows the material deposited on the forward face 14 to be adjusted as needed. The composition of the material may be enhanced as needed to provide a desired combination of metallurgical properties by adding various alloying elements into the stellite alloy material. Such additional alloying elements may include, for example, refractory metals such as chromium, molybdenum, tungsten, nickel, tantalum, and/or vanadium as well as refractory metal carbides in desired proportions to enhance resistance to heat, wear, and/or corrosion of the deposited material. It is to be appreciated that elements other than those listed above may be added to the stellite material and still be within the scope of the invention.
  • Further the composition of the deposited material can be modified for particular a particular operating environment or for a particular bucket material. For example, for applications such as nuclear wet stream where cobalt is restricted, a material deposit that results in a cobalt-free leading edge 18 with enhanced erosion resistance can be provided. Further, a material deposit that is base-matched to titanium can be provided when an erosion resistant leading edge 18 is desired for a bucket 10 formed of a titanium-based alloy.
  • While embodiments of the invention have been described above, it will be understood that, both now and in the future, various improvements and enhancements which fall within the scope of the claims which follow. These claims should be construed to maintain the proper protection for the invention first described.

Claims (13)

1. A method for forming a bucket for a steam turbine comprising forming a leading edge on at least one airfoil by bonding an erosion-resistant material to the airfoil.
2. The method of claim 1 wherein the erosion-resistant material is fusion bonded to the airfoil.
3. The method of claim 1 wherein the erosion-resistant material is fusion bonded to the airfoil by a laser cladding process.
4. The method of claim 1 wherein forming the leading edge comprises forming a plurality of layers of erosion-resistant material.
5. The method of claim 1 wherein the erosion-resistant material comprises a stellite alloy.
6. The method of claim 5 wherein the erosion-resistant material further comprises one or more refractory metals.
7. The method of claim 6 wherein the one or more refractory metals includes chromium, molybdenum, tungsten, nickel, tantalum, and/or vanadium.
8. The method of claim 1 wherein the leading edge is formed by laser gas nitriding.
9. The method of claim 1 wherein the leading edge is substantially cobalt-free.
10. The method of claim 1 wherein a bucket substrate is a titanium-based alloy.
11. The method of claim 10 wherein the erosion-resistant material is base-matched to the titanium-based alloy.
12. The method of claim 1, wherein the bucket comprises a last stage bucket.
13. The method of claim 1, wherein the steam turbine comprises a plurality of airfoils.
US12/025,306 2008-02-04 2008-02-04 Steam turbine bucket with erosion durability Abandoned US20090193656A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US12/025,306 US20090193656A1 (en) 2008-02-04 2008-02-04 Steam turbine bucket with erosion durability
JP2009017850A JP2009185814A (en) 2008-02-04 2009-01-29 Steam turbine bucket having erosion durability
EP09151744A EP2085573A3 (en) 2008-02-04 2009-01-30 Method for forming a steam turbine bucket with erosion durability
CNA2009100057920A CN101503967A (en) 2008-02-04 2009-02-04 Steam turbine bucket with erosion durability

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US12/025,306 US20090193656A1 (en) 2008-02-04 2008-02-04 Steam turbine bucket with erosion durability

Publications (1)

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US20090193656A1 true US20090193656A1 (en) 2009-08-06

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EP (1) EP2085573A3 (en)
JP (1) JP2009185814A (en)
CN (1) CN101503967A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130259698A1 (en) * 2012-03-28 2013-10-03 General Electric Company Method of Joining at Least Two Components, a Method for Rendering a Component Resistant to Eroision, and a Turbine Blade
US9291062B2 (en) 2012-09-07 2016-03-22 General Electric Company Methods of forming blades and method for rendering a blade resistant to erosion
US9903207B2 (en) 2012-02-23 2018-02-27 Nuovo Pignone Srl Turbo-machine impeller manufacturing

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ITUB20152136A1 (en) * 2015-07-13 2017-01-13 Nuovo Pignone Srl TURBOMACCHINA PADDLE WITH PROTECTIVE STRUCTURE, TURBOMACCHINA, AND METHOD FOR FORMING A PROTECTIVE STRUCTURE
JP7105535B2 (en) * 2016-07-15 2022-07-25 富士電機株式会社 Steam turbine blade manufacturing method

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US4532191A (en) * 1982-09-22 1985-07-30 Exxon Research And Engineering Co. MCrAlY cladding layers and method for making same
US4787736A (en) * 1987-06-15 1988-11-29 Toyota Jidosha Kabushiki Kaisha Laser clad valve for internal combustion engine
US4842663A (en) * 1988-04-29 1989-06-27 Kramer Leslie D Steam turbine blade anti-erosion shield and method of turbine blade repair
US20020045053A1 (en) * 2000-08-21 2002-04-18 Hoskin Robert Frank Repair of coatings and surfaces using reactive metals coating processes
US6387541B1 (en) * 1999-05-13 2002-05-14 Rolls-Royce Plc Titanium article having a protective coating and a method of applying a protective coating to a Titanium article
US6863990B2 (en) * 2003-05-02 2005-03-08 Deloro Stellite Holdings Corporation Wear-resistant, corrosion-resistant Ni-Cr-Mo thermal spray powder and method
US7259353B2 (en) * 2004-09-30 2007-08-21 Honeywell International, Inc. Compact coaxial nozzle for laser cladding
US7650710B1 (en) * 2004-06-03 2010-01-26 The United States Of America As Represented By The Secretary Of The Army Article with enhanced resistance to thermochemical erosion, and method for its manufacture
US7695248B2 (en) * 2005-11-15 2010-04-13 Snecma Method of making a rim situated at the free end of a blade, a blade obtained by the method, and a turbomachine fitted with the blade

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