EP0249092A1 - Protection shield for a turbine blade made of titanium, and brazing method for such a shield - Google Patents

Protection shield for a turbine blade made of titanium, and brazing method for such a shield Download PDF

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Publication number
EP0249092A1
EP0249092A1 EP87107673A EP87107673A EP0249092A1 EP 0249092 A1 EP0249092 A1 EP 0249092A1 EP 87107673 A EP87107673 A EP 87107673A EP 87107673 A EP87107673 A EP 87107673A EP 0249092 A1 EP0249092 A1 EP 0249092A1
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European Patent Office
Prior art keywords
blade
plate
temperature
titanium
wafer
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Granted
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EP87107673A
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German (de)
French (fr)
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EP0249092B1 (en
Inventor
André Coulon
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Alstom Holdings SA
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Alstom SA
GEC Alsthom SA
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Priority to AT87107673T priority Critical patent/ATE50824T1/en
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/02—Making ferrous alloys by powder metallurgy
    • C22C33/0257—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements
    • C22C33/0278—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5%
    • C22C33/0292—Making ferrous alloys by powder metallurgy characterised by the range of the alloying elements with at least one alloying element having a minimum content above 5% with more than 5% preformed carbides, nitrides or borides
    • 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
    • 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 present invention relates to a protective plate for a turbine blade made of titanium alloy.
  • Titanium alloy blades for steam turbines are particularly interesting for the last low pressure stages where the blades must be large. However, in these latter stages, the water vapor includes drops of water which strike the movable blades, the peripheral speed of which is high.
  • a plate comprising the following components is fixed by welding or soldering to these leading edges: TiC: 28 to 40% Cr + Co: 12 to 26% MB: 1 to 6% Ni: 3 to 8% Cu: 0.3 to 1.5% Fe complement.
  • Titanium carbide has a coefficient of expansion and a shear modulus identical to titanium.
  • the binder consists of cobalt and chromium which have a high intrinsic resistance to erosion and nickel which improves the ductility of the assembly.
  • Iron constitutes the basic matrix in which the titanium carbides integrate without difficulty.
  • the structure of the wafer is a nickel martensite which has a high resistance to wear due to the presence of chromium and cobalt and a relatively high toughness due to the presence of nickel.
  • the invention also relates to a method for brazing the wafer, characterized in that it comprises the following steps: - Installation of the plate on the blade with interposition between the two of a copper-based strip with a thickness of between 7 and 15 / 100th of a mm. - Rise to a temperature between 900 ° and 950 ° C of dawn with its plate in a vacuum oven or in an inert atmosphere and maintenance of this temperature for a time between 30 and 75 minutes. - Cooling down to room temperature.
  • the soldering between the blade, the copper strip and the plate is simultaneous and optimal.
  • there is at least partial dissolution of the titanium carbide thus giving the wafer a hardness greater than 50 HRC.
  • a wafer with a hardness greater than 60 HRC is desired, after cooling to ambient temperature, it rises to the temperature up to 450 ° C - 500 ° C and is maintained for 4 to 6 hours before being brought back down to 'to the ambient.
  • This additional step allows almost complete solution of the titanium carbide and simultaneously provides an expansion heat treatment.
  • Figure 1 shows a plate according to the invention fixed on a titanium carbide blade.
  • FIG. 2 represents a top view of the blade of FIG. 1.
  • FIG. 3 represents a section of the dawn of FIG. 1.
  • the steam turbine blade shown in FIG. 1 has a foot 1 and a twisted blade 2 comprising a leading edge 3 and a trailing edge 4. At the top of the blade, we deposited along the edge of attack 3 on the upper surface side a plate 5. This plate extends over about a third of the width of the blade 2. Between the blade and the plate is disposed a copper-based strip 6 (fig. 2 and 3).
  • the blade is made of titanium alloy and the plate 5 has the following composition:
  • composition 2 33% 14% 9% 5% 6% 0.8% Supplement.
  • the wafer is obtained by sintering and mechanical compacting from powders followed by machining.
  • the plate will have a length equal to the part of the blade to be protected (up to 500 mm), an adequate width, will be flat or left, with or without angle or rounded, in order to adapt to the shape of the edge blade attack.
  • the machining must be done with sufficient precision so that the residual clearance between the blade 2 and the plate 5 is everywhere less than 1 / 10th of a mm.
  • the blade 2 is then prepared and the plate 5 is brazed onto the blade 2 by inserting between the two a strip 6 made of copper with a thickness of between 7 and 15/100 th of a mm.
  • the blade 2 provided with the plate 5 is placed in an oven, the latter being held in place by two or three molybdenum clamps.
  • the temperature is raised to a temperature between 900 ° C and 950 ° C. This temperature is maintained for 30 to 75 minutes depending on the thickness of the leading edge of the blade, then the oven is allowed to cool to ambient.
  • This treatment allows in addition to brazing to achieve structural hardening of the wafer 5 by dissolving a large part of the titanium carbide.
  • the wafer 5 then has a hardness of 50 to 55 HRC.
  • the latter is subjected to the following additional treatment.
  • the temperature of the furnace is raised to 450-500 ° C. and it is maintained for 4 to 6 hours, which results in almost complete dissolution of the titanium carbide. In addition, this allows simultaneous relaxation treatment to be carried out.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Metallurgy (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)
  • Ceramic Products (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Coating With Molten Metal (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Pressure Welding/Diffusion-Bonding (AREA)

Abstract

Plaquette de protection pour aube en titane et procédé de brasage d'une telle plaquette.L'invention concerne une plaquette (5) de protection pour aube en ti­tane pour turbine à vapeur. La plaquette comporte TiC 28 à 40 %, Cr + Co : 12 à 26 %, Ni 3 à 8 %, Cu 0,3 à 1,5 %, Fe complément.Pour braser la plaquette (5) sur l'aube (1) on interpose entre les deux un feuillard (6) à base de cuivre d'épaisseur comprise entre 7 et 15/100ème de mm puis on monte la température de l'aube (1) avec sa plaquette (5) dans un four sous vide ou à atmosphère inerte jus­qu'à 900 - 950°C. Cette température est maintenue pendant 30 à 75 minutes avant de laisser refroidir le four jusqu'à l'ambiante.Le brasage optimal permet également de durcir la plaquette (5) qui possède une très bonne résistance à l'abrasion par les gouttelettes d'eau.Protective plate for a titanium blade and method of brazing such a plate.The invention relates to a protective plate (5) for a titanium blade for a steam turbine. The wafer comprises TiC 28 to 40%, Cr + Co: 12 to 26%, Ni 3 to 8%, Cu 0.3 to 1.5%, additional Fe. To braze the wafer (5) on the blade (1 ) a copper-based strip (6) with a thickness of between 7 and 15/100th of a mm is interposed between the two, then the temperature of the blade (1) with its wafer (5) is raised in a vacuum oven or in an inert atmosphere up to 900 - 950°C. This temperature is maintained for 30 to 75 minutes before allowing the oven to cool down to ambient temperature. The optimal brazing also makes it possible to harden the plate (5) which has very good resistance to abrasion by water droplets .

Description

La présente invention concerne une plaquette de protection pour aube de turbine en alliage de titane.The present invention relates to a protective plate for a turbine blade made of titanium alloy.

Les aubes en alliage de titane pour turbines à vapeur sont parti­culièrement intéressantes pour les derniers étages à basse pression où les aubes doivent être grandes. Toutefois dans ces derniers étages la vapeur d'eau comporte des gouttes d'eau qui viennent frapper les aubes mobiles dont la vitesse périphérique est grande.Titanium alloy blades for steam turbines are particularly interesting for the last low pressure stages where the blades must be large. However, in these latter stages, the water vapor includes drops of water which strike the movable blades, the peripheral speed of which is high.

Pour protéger les bords d'attaque des aubes on fixe par soudage ou brasage sur ces bords d'attaque une plaquette comportant les compo­sants suivants :
TiC : 28 à 40 %
Cr + Co : 12 à 26 %
Mo : 1 à 6 %
Ni : 3 à 8 %
Cu : 0,3 à 1,5 %
Fe complément.To protect the leading edges of the blades, a plate comprising the following components is fixed by welding or soldering to these leading edges:
TiC: 28 to 40%
Cr + Co: 12 to 26%
MB: 1 to 6%
Ni: 3 to 8%
Cu: 0.3 to 1.5%
Fe complement.

Le carbure de titane possède un coefficient de dilatation et un module de cisaillement identiques au titane. Le liant est constitué de cobalt et de chrome qui présentent une grande résistance intrinsèque à l'érosion et de nickel qui améliore la ductilité de l'ensemble.Titanium carbide has a coefficient of expansion and a shear modulus identical to titanium. The binder consists of cobalt and chromium which have a high intrinsic resistance to erosion and nickel which improves the ductility of the assembly.

Le fer constitue la matrice de base dans laquelle les carbures de titane s'intégrent sans difficulté.Iron constitutes the basic matrix in which the titanium carbides integrate without difficulty.

La structure de la plaquette est une martensite au nickel qui présente une grande résistance à l'usure du fait de la présence de chrome et de cobalt et une ténacité relativement élevée du fait de la présence de nickel.The structure of the wafer is a nickel martensite which has a high resistance to wear due to the presence of chromium and cobalt and a relatively high toughness due to the presence of nickel.

L'invention concerne également un procédé de brasage de la pla­quette caractérisé en ce qu'il comporte les étapes suivantes :
- Pose de la plaquette sur l'aube avec interposition entre les deux d'un feuillard à base de cuivre d'une épaisseur comprise entre 7 et 15/100ème de mm.
- Montée à une température comprise entre 900° et 950°C de l'aube avec sa plaquette dans un four sous vide ou à atmosphère inerte et maintien de cette température pendant un temps compris entre 30 et 75 minutes.
- Refroidissement jusqu'à la température ambiante.The invention also relates to a method for brazing the wafer, characterized in that it comprises the following steps:
- Installation of the plate on the blade with interposition between the two of a copper-based strip with a thickness of between 7 and 15 / 100th of a mm.
- Rise to a temperature between 900 ° and 950 ° C of dawn with its plate in a vacuum oven or in an inert atmosphere and maintenance of this temperature for a time between 30 and 75 minutes.
- Cooling down to room temperature.

Grâce à ce procédé, le brasage entre l'aube, le feuillard à base de cuivre et la plaquette est simultané et optimal. De plus il y a mise en solution au moins partielle du carbure de titane conférant ainsi à la plaquette une dureté supérieure à 50 HRC.Thanks to this process, the soldering between the blade, the copper strip and the plate is simultaneous and optimal. In addition, there is at least partial dissolution of the titanium carbide, thus giving the wafer a hardness greater than 50 HRC.

Si on désire une plaquette de dureté supérieure à 60 HRC on remonte, après le refroidissement à l'ambiante, à la température jusqu'à 450°C - 500°C et on la maintient pendant 4 à 6 heures avant de la refaire redescendre jusqu'à l'ambiante.If a wafer with a hardness greater than 60 HRC is desired, after cooling to ambient temperature, it rises to the temperature up to 450 ° C - 500 ° C and is maintained for 4 to 6 hours before being brought back down to 'to the ambient.

Cette étape supplémentaire permet la mise en solution quasi-totale du carbure de titane et simultanément assure un traite­ment thermique de détente.This additional step allows almost complete solution of the titanium carbide and simultaneously provides an expansion heat treatment.

L'invention va maintenant être décrite plus en détail en se référant à un mode de réalisation particulier cité à titre d'exemple non limitatif et représenté par les dessins annexés.The invention will now be described in more detail with reference to a particular embodiment cited by way of nonlimiting example and represented by the accompanying drawings.

La figure 1 représente une plaquette selon l'invention fixée sur une aube en carbure de titane.Figure 1 shows a plate according to the invention fixed on a titanium carbide blade.

La figure 2 représente une vue de dessus de l'aube de la figure 1.FIG. 2 represents a top view of the blade of FIG. 1.

La figure 3 représente une coupe de l'aube de la figure 1.FIG. 3 represents a section of the dawn of FIG. 1.

L'aube de turbine à vapeur représentée à la figure 1 comporte un pied 1 et une pale vrillée 2 comprenant un bord d'attaque 3 et un bord de fuite 4. A la partie haute de l'aube on a déposé le long du bord d'attaque 3 côté extrados une plaquette 5. Cette plaquette s'étend sur environ un tiers de la largeur de la pale 2. Entre la pale et la plaquette est disposé un feuillard à base de cuivre 6 (fig. 2 et 3).The steam turbine blade shown in FIG. 1 has a foot 1 and a twisted blade 2 comprising a leading edge 3 and a trailing edge 4. At the top of the blade, we deposited along the edge of attack 3 on the upper surface side a plate 5. This plate extends over about a third of the width of the blade 2. Between the blade and the plate is disposed a copper-based strip 6 (fig. 2 and 3).

L'aube est en alliage de titane et la plaquette 5 a la composi­tion suivante :

Figure imgb0001
The blade is made of titanium alloy and the plate 5 has the following composition:
Figure imgb0001

Deux compositions particulières ont donné de bons résultats.

Figure imgb0002
Composition 2 33% 14% 9% 5% 6% 0,8% Complément.Two particular compositions have given good results.
Figure imgb0002
 Composition 2 33% 14% 9% 5% 6% 0.8% Supplement.

On obtient la plaquette par frittage et compactage mécanique à partir de poudres suivis d'un usinage. La plaquette aura une longueur égale à la partie de la pale à protéger (jusqu'à 500 mm), une largeur adéquate, sera de forme plane ou gauche, avec ou sans angle ou arrondi, en vue de son adaptation à la forme du bord d'attaque de la pale.The wafer is obtained by sintering and mechanical compacting from powders followed by machining. The plate will have a length equal to the part of the blade to be protected (up to 500 mm), an adequate width, will be flat or left, with or without angle or rounded, in order to adapt to the shape of the edge blade attack.

L'usinage doit être fait avec suffisamment de précision pour que le jeu résiduel entre la pale 2 et la plaquette 5 soit partout infé­rieur à 1/10ème de mm.The machining must be done with sufficient precision so that the residual clearance between the blade 2 and the plate 5 is everywhere less than 1 / 10th of a mm.

On prépare ensuite la pale 2 et on brase la plaquette 5 sur la pale 2 en intercalant entre les deux un feuillard 6 à base de cuivre d'une épaisseur comprise entre 7 et 15/100 ème de mm.The blade 2 is then prepared and the plate 5 is brazed onto the blade 2 by inserting between the two a strip 6 made of copper with a thickness of between 7 and 15/100 th of a mm.

Pour réaliser l'opération de brasage on met la pale 2 munie de la plaquette 5 dans un four, celle-ci étant maintenue en place par deux ou trois pinces en molybdène.To carry out the brazing operation, the blade 2 provided with the plate 5 is placed in an oven, the latter being held in place by two or three molybdenum clamps.

On monte la température jusqu'à une température comprise entre 900°C et 950°C. Cette température est maintenue pendant 30 à 75 minutes suivant l'épaisseur du bord d'attaque de l'aube, puis on lais­se refroidir le four jusqu'à l'ambiante.The temperature is raised to a temperature between 900 ° C and 950 ° C. This temperature is maintained for 30 to 75 minutes depending on the thickness of the leading edge of the blade, then the oven is allowed to cool to ambient.

Ce traitement permet en plus du brasage de réaliser un durcissement structural de la plaquette 5 par mise en solution d'une partie importante du carbure de titane. La plaquette 5 a alors une dureté de 50 à 55 HRC.This treatment allows in addition to brazing to achieve structural hardening of the wafer 5 by dissolving a large part of the titanium carbide. The wafer 5 then has a hardness of 50 to 55 HRC.

Pour augmenter encore la dureté de la plaquette 5 on fait subir à celle-ci le traitement additional suivant.To further increase the hardness of the wafer 5, the latter is subjected to the following additional treatment.

On remonte la température du four jusqu'à 450-500°C et on la maintient pendant 4 à 6 heures ce qui entraîne une mise en solution quasi-totale du carbure de titane. De plus cela permet de réaliser simultanément un traitement de détente.The temperature of the furnace is raised to 450-500 ° C. and it is maintained for 4 to 6 hours, which results in almost complete dissolution of the titanium carbide. In addition, this allows simultaneous relaxation treatment to be carried out.

Claims (3)

1/ Plaquette de protection (5) pour aube (1) de turbine en titane, caractérisée en ce qu'elle comporte les composants suivants :
TiC 28 à 40 %
Cr + Co 12 à 26 %
Mo 1 à 6 %
Ni 3 à 8 %
Cu 0,3 à 1,5 %
Fe complément.1 / Protective plate (5) for blade (1) of titanium turbine, characterized in that it comprises the following components:
TiC 28 at 40%
Cr + Co 12 to 26%
MB 1 to 6%
Ni 3 to 8%
Cu 0.3 to 1.5%
Fe complement. 2/ Procédé de brasage sur l'aube (1) de la plaquette (5) selon la revendication 1, caractérisé en ce qu'il comporte les étapes suivantes :
- Pose de la plaquette (5) sur l'aube (1) avec interposition entre les deux d'un feuillard (6) à base de cuivre d'une épaisseur comprise entre 7 et 15/100ème de mm.
- Montée à une température comprise entre 900° et 950°C de l'aube (1) avec sa plaquette (5) dans un four sous vide ou à atmosphère inerte et maintien de cette température pendant un temps compris entre 30 et 75 minutes.
- Refroidissement jusqu'à l'ambiante.2 / A method of brazing on the blade (1) of the wafer (5) according to claim 1, characterized in that it comprises the following steps:
- Installation of the plate (5) on the blade (1) with interposition between the two of a strip (6) based on copper with a thickness between 7 and 15 / 100th of mm.
- Rise to a temperature between 900 ° and 950 ° C of the dawn (1) with its plate (5) in a vacuum oven or in an inert atmosphere and maintaining this temperature for a time between 30 and 75 minutes.
- Cooling down to ambient. 3/ Procédé selon la revendication 2, caractérisé en ce qu'après le refroidissement jusqu'à l'ambiante, on remonte la température jusqu'à 450° - 500°C et on la maintient pendant 4 à 6 heures avant de la refaire redescendre jusqu'à l'ambiante.3 / A method according to claim 2, characterized in that after cooling to room temperature, the temperature is raised to 450 ° - 500 ° C and maintained for 4 to 6 hours before bringing it down again to the ambient.
EP87107673A 1986-05-28 1987-05-26 Protection shield for a turbine blade made of titanium, and brazing method for such a shield Expired - Lifetime EP0249092B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT87107673T ATE50824T1 (en) 1986-05-28 1987-05-26 PROTECTIVE SHIELD FOR A TITANIUM TURBINE BLADE AND BRADING METHOD FOR SUCH PROTECTIVE SHIELD.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8607661 1986-05-28
FR8607661A FR2599425B1 (en) 1986-05-28 1986-05-28 PROTECTIVE PLATE FOR TITANIUM BLADE AND METHOD OF BRAZING SUCH A PLATE.

Publications (2)

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EP0249092A1 true EP0249092A1 (en) 1987-12-16
EP0249092B1 EP0249092B1 (en) 1990-03-07

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EP87107673A Expired - Lifetime EP0249092B1 (en) 1986-05-28 1987-05-26 Protection shield for a turbine blade made of titanium, and brazing method for such a shield

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US (1) US4795313A (en)
EP (1) EP0249092B1 (en)
JP (1) JPS62297442A (en)
CN (1) CN1009472B (en)
AT (1) ATE50824T1 (en)
CS (3) CS276725B6 (en)
DE (1) DE3761833D1 (en)
ES (1) ES2013272B3 (en)
FR (1) FR2599425B1 (en)
GR (1) GR3000501T3 (en)
ZA (1) ZA873837B (en)

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EP0605152A1 (en) * 1992-12-30 1994-07-06 General Electric Company Process for producing turbine bucket with water droplet erosion protection and realted product
EP0780187A1 (en) * 1995-12-22 1997-06-25 Gec Alsthom Electromecanique Sa Manufacturing process of a blade comprising alpha-beta titanium with an insert at metastable beta titanium and a blade manufactured by such a process
WO2011039075A1 (en) * 2009-09-30 2011-04-07 Siemens Aktiengesellschaft Final-stage rotor blade of a steam turbine
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US5165859A (en) * 1992-06-26 1992-11-24 Hudson Products Corporation Leading edge protection for fan blade
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US7841834B1 (en) * 2006-01-27 2010-11-30 Florida Turbine Technologies, Inc. Method and leading edge replacement insert for repairing a turbine engine blade
US20080181808A1 (en) 2007-01-31 2008-07-31 Samuel Vinod Thamboo Methods and articles relating to high strength erosion resistant titanium alloy
US7780419B1 (en) 2007-03-06 2010-08-24 Florida Turbine Technologies, Inc. Replaceable leading edge insert for an IBR
US20090068446A1 (en) * 2007-04-30 2009-03-12 United Technologies Corporation Layered structures with integral brazing materials
DE102008047043A1 (en) * 2008-09-13 2010-03-18 Mtu Aero Engines Gmbh A gas turbine blade, gas turbine blade, gas turbine blade replacement, and gas turbine blade repair method
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US10428657B2 (en) 2013-06-21 2019-10-01 Pratt & Whitney Canada Corp. Method for repairing a blade
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EP0605152A1 (en) * 1992-12-30 1994-07-06 General Electric Company Process for producing turbine bucket with water droplet erosion protection and realted product
DE4310896C1 (en) * 1993-04-02 1994-03-24 Thyssen Industrie Mfr. process for wear resistant edges on turbine blades, pref. steam turbine blades of chrome steels and/or titanium@ base alloys - by application of a powder layer by plasma spraying or encapsulation, followed by hot isostatic pressing
EP0780187A1 (en) * 1995-12-22 1997-06-25 Gec Alsthom Electromecanique Sa Manufacturing process of a blade comprising alpha-beta titanium with an insert at metastable beta titanium and a blade manufactured by such a process
FR2742689A1 (en) * 1995-12-22 1997-06-27 Gec Alsthom Electromec PROCESS FOR MANUFACTURING A TITANIUM ALPHA BETA DARK COMPRISING A METASTABLE BETA TITANIUM INSERT, AND A DUST PRODUCED BY SUCH A PROCESS
WO2011039075A1 (en) * 2009-09-30 2011-04-07 Siemens Aktiengesellschaft Final-stage rotor blade of a steam turbine
CN103603695A (en) * 2011-12-31 2014-02-26 无锡透平叶片有限公司 Blade alloy groove and processing method thereof
CN103603695B (en) * 2011-12-31 2016-06-22 无锡透平叶片有限公司 A kind of blade alloy groove and processing method thereof
FR3123380A1 (en) * 2021-05-28 2022-12-02 Safran Aircraft Engines Improved leading edge shield

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ATE50824T1 (en) 1990-03-15
EP0249092B1 (en) 1990-03-07
ES2013272B3 (en) 1990-05-01
FR2599425A1 (en) 1987-12-04
CS382790A3 (en) 1992-01-15
CS276725B6 (en) 1992-08-12
CS276857B6 (en) 1992-08-12
CS389287A3 (en) 1992-03-18
FR2599425B1 (en) 1988-08-05
DE3761833D1 (en) 1990-04-12
US4795313A (en) 1989-01-03
ZA873837B (en) 1987-11-24
GR3000501T3 (en) 1991-07-31
JPS62297442A (en) 1987-12-24
CN1009472B (en) 1990-09-05
CN87104497A (en) 1987-12-16

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