Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
  • B22F1/05—Metallic powder characterised by the size or surface area of the particles
  • B22F1/052—Metallic powder characterised by the size or surface area of the particles characterised by a mixture of particles of different sizes or by the particle size distribution
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C1/00—Making non-ferrous alloys
  • C22C1/04—Making non-ferrous alloys by powder metallurgy
  • C22C1/0433—Nickel- or cobalt-based alloys
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
  • B22F1/05—Metallic powder characterised by the size or surface area of the particles
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
  • B22F10/20—Direct sintering or melting
  • B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
  • B22F10/30—Process control
  • B22F10/36—Process control of energy beam parameters
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
  • B22F10/30—Process control
  • B22F10/36—Process control of energy beam parameters
  • B22F10/366—Scanning parameters, e.g. hatch distance or scanning strategy
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
  • B22F10/60—Treatment of workpieces or articles after build-up
  • B22F10/64—Treatment of workpieces or articles after build-up by thermal means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
  • B22F5/009—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of turbine components other than turbine blades
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
  • B22F5/04—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product of turbine blades
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B33—ADDITIVE MANUFACTURING TECHNOLOGY
  • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
  • B33Y40/00—Auxiliary operations or equipment, e.g. for material handling
  • B33Y40/20—Post-treatment, e.g. curing, coating or polishing
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C19/00—Alloys based on nickel or cobalt
  • C22C19/03—Alloys based on nickel or cobalt based on nickel
  • C22C19/05—Alloys based on nickel or cobalt based on nickel with chromium
  • C22C19/051—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W
  • C22C19/055—Alloys based on nickel or cobalt based on nickel with chromium and Mo or W with the maximum Cr content being at least 20% but less than 30%
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
  • C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
  • C22F1/10—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of nickel or cobalt or alloys based thereon
• • 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
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F2301/00—Metallic composition of the powder or its coating
  • B22F2301/15—Nickel or cobalt
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F2304/00—Physical aspects of the powder
  • B22F2304/10—Micron size particles, i.e. above 1 micrometer up to 500 micrometer
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
  • B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B33—ADDITIVE MANUFACTURING TECHNOLOGY
  • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
  • B33Y10/00—Processes of additive manufacturing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B33—ADDITIVE MANUFACTURING TECHNOLOGY
  • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
  • B33Y70/00—Materials specially adapted for additive manufacturing
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B33—ADDITIVE MANUFACTURING TECHNOLOGY
  • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
  • B33Y80/00—Products made by additive manufacturing
• • 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
  • F05D2230/20—Manufacture essentially without removing material
  • F05D2230/22—Manufacture essentially without removing material by sintering
• • 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
  • F05D2230/20—Manufacture essentially without removing material
  • F05D2230/23—Manufacture essentially without removing material by permanently joining parts together
  • F05D2230/232—Manufacture essentially without removing material by permanently joining parts together by welding
  • F05D2230/234—Laser welding
• • 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
  • F05D2230/31—Layer deposition
• • 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
  • F05D2300/131—Molybdenum
• • 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
  • F05D2300/132—Chromium
• • 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
  • F05D2300/17—Alloys
• • 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
  • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
  • Y02P10/00—Technologies related to metal processing
  • Y02P10/25—Process efficiency

Definitions

• TITLE Metallic powder for a powder bed additive manufacturing process
• the present invention relates to the field of additive manufacturing and more particularly alloys for the implementation of an additive manufacturing process on a powder bed.
• LBM powder bed additive manufacturing
• a powder comprising a metal alloy for an additive manufacturing process on a powder bed, which makes it possible to obtain a material that retains its characteristics of tensile strength, creep and resistance to oxidation. and corrosion, at least up to a temperature of 850° C., or even 1000° C., and which is weldable.
• the invention provides a metal powder for an additive manufacturing process, the metal powder comprising a nickel base alloy comprising between 0.02% and 0.04% carbon, between 18% and 22% chromium, between 11% and 13% cobalt, between 5% and 5.5% niobium, between 3% and 3.5% tantalum, between 3% and 3.4% molybdenum, between 0.9% and 1.1% titanium, between 0.4% and 0.6% aluminium, between 0.003% and 0.005% boron, maximum 0.5% iron, maximum 0.1% copper, maximum 0.1% silicon, maximum 0.05% manganese, maximum 0.01% phosphorus, maximum 0.01% zirconium, maximum 0.004% magnesium, maximum 0.003% sulphur, maximum 0.025% oxygen, maximum 0.018% nitrogen and maximum 0.003% hydrogen.
• a nickel base alloy comprising between 0.02% and 0.04% carbon, between 18% and 22% chromium, between 11% and 13% cobalt, between 5% and 5.5% niobium, between 3% and 3.5% tantalum,
• the metal powder comprises a plurality of grains having a particle size according to which at least 10% of the grains have a diameter of between 8 ⁇ m and 28 ⁇ m.
• the metal powder comprises a plurality of grains having a particle size according to which at least 50% of the grains have a diameter of between 10 ⁇ m and 45 ⁇ m.
• the metal powder comprises a plurality of grains having a particle size according to which at least 90% of the grains have a diameter of between 25 ⁇ m and 75 ⁇ m.
• the invention proposes a process for additive manufacturing on a powder bed by laser fusion of a powder according to the first aspect, the process making it possible to manufacture a part in a material obtained by laser fusion of said powder.
• the laser emits a beam with a power between 150W and 350W.
• the laser is moved at a speed between 900mm/s and 2500mm/s.
• the laser emits a beam having a diameter between 50 ⁇ m and 200 ⁇ m.
• the laser fuses the powder in bands, each band having a width between 2mm and 15mm.
• Each merged strip overlaps at least one other strip, over a width between 0.05mm and 0.15mm.
• each layer of fused powder has a thickness between 20 ⁇ m and 60 ⁇ m.
• the method comprises a step of improving the structure of the material obtained by laser melting of said powder, the step of improving the structure of the material comprising at least the following phases:
• the step of improving the structure of the material also includes a preliminary phase (a) of stress relief at a temperature between 945°C and 965°C, for approximately 2 hours.
• the step of improving the structure of the material also includes the following phases:
• the invention proposes a material obtained according to the process according to the second aspect, comprising a nickel-based alloy comprising between 0.02% and 0.04% carbon, between 18% and 22% chromium, between 11% and 13% cobalt, between 5% and 5.5% niobium, between 3% and 3.5% tantalum, between 3% and 3.4% molybdenum, between 0.9% and 1, 1% titanium, between 0.4% and 0.6% aluminium, between 0.003% and 0.005% boron, maximum 0.5% iron, maximum 0.1% copper, maximum 0, 1% silicon, maximum 0.05% manganese, maximum 0.01% phosphorus, maximum 0.01% zirconium, maximum 0.004% magnesium, maximum 0.003% sulfur, maximum 0.027% oxygen, maximum 0.018% nitrogen and maximum 0.003% hydrogen.
• a nickel-based alloy comprising between 0.02% and 0.04% carbon, between 18% and 22% chromium, between 11% and 13% cobalt, between 5% and 5.5% niobium, between 3% and 3.5% tant
• the invention proposes a turbomachine part made of the material according to the third aspect.
• the invention proposes a turbomachine comprising at least one part according to the fourth aspect. DESCRIPTION OF FIGURES
• Figure 1 is a table detailing the preferred composition of the powder object of the invention.
• FIG. 2 schematically represents a step for improving the structure of the material of a preferred embodiment of the method according to the invention.
• Figure 3 is a table detailing the composition of the material preferably obtained by the process according to the invention.
• Figure 4a is a photograph of the material preferably obtained by the process according to the invention before chemical attack.
• FIG. 4b is a photograph according to a first plane of the material preferably obtained by the process according to the invention.
• Figure 4c is a photograph according to a second plane of the material preferably obtained by the process according to the invention.
• the invention proposes a metal powder for an additive manufacturing process on a powder bed.
• the metal powder comprises a nickel base alloy comprising at least carbon, chromium, cobalt, niobium, tantalum, molybdenum, titanium, aluminum, boron, iron, copper, silicon, manganese, phosphorus, zirconium, magnesium, sulfur, oxygen, nitrogen and hydrogen.
• the nickel-based alloy comprises between 0.02% and 0.04% carbon, between 18% and 22% chromium, between 11% and 13% cobalt, between 5% and 5.5% niobium, between 3% and 3.5% tantalum, between 3% and 3.4% molybdenum, between 0.9% and 1.1% titanium, between 0 .4% and 0.6% aluminum, between 0.003% and 0.005% boron, maximum 0.5% iron, maximum 0.1% copper, maximum 0.1% silicon, maximum 0.05% manganese, maximum 0.01% phosphorus, maximum 0.01% zirconium, maximum 0.004% magnesium, maximum 0.003% sulfur, maximum 0.025% oxygen, maximum 0.018% nitrogen and maximum 0.003% hydrogen.
• the powder that is the subject of the invention comprises a rate of nitrogen, oxygen and sulfur suitable for use in an additive manufacturing process on a powder bed.
• thermomechanical characteristics required after fusion by a laser beam of the powder.
• metal powders are known for foundry (or metallurgy in general) which contain substantially the same list of elements, but their particle size and their sulfur, nitrogen and oxygen levels are not suitable.
• each of the sulfur, nitrogen and oxygen is present in said alloy in a rate lower than a maximum rate for additive manufacturing, advantageously 0.025%, very advantageously even 0.003% for the sulfur and 0.018% for the 'nitrogen.
• the powder also has a particle size suitable for use in an additive manufacturing process on a powder bed.
• 10% of the grains have a diameter of between 8 ⁇ m and 28 ⁇ m, 50% of the grains have a diameter of between 10 ⁇ m and 45 ⁇ m and 90% of the grains have a diameter of between 25 ⁇ m and 75 ⁇ m.
• 10% of the grains have a diameter of between 10 ⁇ m and 25 ⁇ m, 50% of the grains have a diameter of between 15 ⁇ m and 40 ⁇ m and 90% of the grains have a diameter of between 30 ⁇ m and 70 ⁇ m.
• This specific particle size allows very advantageously to combine an optimal compactness of the powder when it is used in an additive manufacturing process on a powder bed, while having an optimal flowability and minimizing the melting stresses (which reduces the risks of cracking of the material obtained by an additive manufacturing process).
• this particle size is obtained via an atomization process, which makes it possible to ensure the morphology of each grain while limiting the risks of pollution of the powder by foreign bodies.
• the invention relates to a process for additive manufacturing on a powder bed by laser melting of a powder according to the invention.
• the process uses an additive manufacturing machine, in which a system deposits a bed of powder and emits, for example, a laser beam to melt and consolidate a layer of material being manufactured.
• a bed of powder a few tens of microns thick is deposited on a plate, generally using a scraper. Then we melt locally.
• the plate is lowered and the deposition/fusion cycle is repeated until the part is built.
• spot In a classic way the laser beam illuminates a defined surface which is usually called "spot".
• the laser beam is enveloped in a jet of neutral gas.
• argon or dinitrogen will be used.
• the laser emits a beam with a power of between 150W and 300W.
• the laser is preferably moved at a speed of between 900mm/s and 2500mm/s.
• the laser emits a beam having a diameter of between 50 ⁇ m and 200 ⁇ m. It is specified that by diameter of the beam, it is understood that the spot, the surface illuminated by the beam, has a diameter of between 50 ⁇ m and 200 ⁇ m.
• the laser beam is moved by band and by superimposed layer to consolidate the material being manufactured.
• each band has a width of between 2mm and 15mm.
• the merged bands can overlap over a width between 0.05mm and 0.15mm.
• each fused powder layer can have a thickness of between 20 ⁇ m and 60 ⁇ m.
• the method comprises a step of improving the structure of the material, by various heat treatments.
• Each heat treatment ends with air cooling (for example under argon protection).
• this step may include the following phases:
• interoperation treatment an optional phase (a) of stress relief, called interoperation treatment, at a temperature between 945° C and 965° C, for about 2 hours (within 20%).
• This treatment allows homogenization of the material and elimination of lava phases, before the main phase of the heat treatment.
• This main phase known as the “use state” makes it possible to obtain the metallurgical health necessary for the use of the material for turbomachine parts, and includes a succession of heat treatments.
• the employment state phase then comprises (c) a second heat treatment, which itself comprises three sub-parts: heating at a temperature between 890°C and 910°C, for approximately 4 hours (at 10 minutes close), followed by cooling to 775°C at a rate of at least 55°C per hour; then maintaining at a temperature between 765°C and 785°C, for about 4 hours (within 10 minutes), followed by cooling to 705°C again at a rate of at least 55°C per hour ; and finally maintaining at a temperature of between 695° C. and 715° C., for 8 hours (within 10 minutes).
• a second heat treatment which itself comprises three sub-parts: heating at a temperature between 890°C and 910°C, for approximately 4 hours (at 10 minutes close), followed by cooling to 775°C at a rate of at least 55°C per hour; then maintaining at a temperature between 765°C and 785°C, for about 4 hours (within 10 minutes), followed by cooling to 705°C again at a rate
• a grain size of the order of 2 to 8 ASTM is obtained which allows a good compromise between the mechanical properties (in particular between creep and fatigue).
• the heat treatments make it possible to obtain an HRC hardness of between 15 and 60HRC and properties at the expected and interesting levels for the parts concerned.
• the metallurgical health obtained includes indications of less than 0.8 mm and a porosity rate of less than 2%, which allow for excellent mechanical properties.
• an additional post-welding phase can be applied to maintain the two materials at the best of their respective properties.
• This optional phase includes (d) a third heat treatment at a temperature between 945°C and 965°C, for approximately 1 hour (within 20%), followed by cooling to 650°C in less than 23 minutes. We always have the final air cooling.
• the post-welding phase also comprises (e) a fourth heat treatment, called tempering, again comprising three sub-parts: maintaining at a temperature between 750° C. and 770° C., for approximately 5 hours (within 10 minutes), followed by cooling to 700°C at a rate of at least 55°C per hour; then holding at a temperature between 690° C. and 710° C., for about 8 hours (within 10 minutes) followed by cooling in air, then a final hold at a temperature between 640° C. and 660 °C, for about 1 hour (to the nearest 10 minutes), terminated by air cooling.
• tempering again comprising three sub-parts: maintaining at a temperature between 750° C. and 770° C., for approximately 5 hours (within 10 minutes), followed by cooling to 700°C at a rate of at least 55°C per hour; then holding at a temperature between 690° C. and 710° C., for about 8 hours (within 10 minutes) followed by cooling in air, then a final hold
• thermomechanical treatment phase application of high temperature and pressure
• CIC hot isostatic compaction type.
• the invention relates to a material obtained according to the process of the invention.
• the material obtained comprises a nickel-based alloy which comprises between 0.02% and 0.04% carbon, between 18% and 22% chromium, between 11 % and 13% cobalt, between 5% and 5.5% niobium, between 3% and 3.5% tantalum, between 3% and 3.4% molybdenum, between 0.9% and 1.1% titanium, between 0.4% and 0.6% aluminium, between 0.003% and 0.005% boron, maximum 0.5% iron, maximum 0.1% copper, maximum 0.1% silicon, maximum 0.05% manganese, maximum 0.01% phosphorus, maximum 0.01% zirconium, maximum 0.004% magnesium, maximum 0.003% sulphur, maximum 0.027% oxygen, maximum 0.018% nitrogen and maximum 0.003% hydrogen.
• a nickel-based alloy which comprises between 0.02% and 0.04% carbon, between 18% and 22% chromium, between 11 % and 13% cobalt, between 5% and 5.5% niobium, between 3% and 3.5% tantalum, between 3% and 3.4% molybden
• the material may include other trace chemical elements, in particular: - Platinum and/or vanadium at a maximum rate of 500ppm;
• the variation in the oxygen level, in relation to the composition of the powder is due to oxygen uptake during the execution of the additive manufacturing process.
• the invention relates to a turbomachine part manufactured according to the method of the invention, i.e. in said material as described above.
• the invention relates to a turbomachine comprising at least one part according to the invention.

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• Engineering & Computer Science (AREA)
• Chemical & Material Sciences (AREA)
• Materials Engineering (AREA)
• Manufacturing & Machinery (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• Automation & Control Theory (AREA)
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• Metallurgy (AREA)
• Organic Chemistry (AREA)
• Plasma & Fusion (AREA)
• General Engineering & Computer Science (AREA)
• Crystallography & Structural Chemistry (AREA)
• Powder Metallurgy (AREA)

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• 2021
  • 2021-12-07 FR FR2113048A patent/FR3129857B1/fr active Active
• 2022
  • 2022-12-07 WO PCT/FR2022/052271 patent/WO2023105162A1/fr not_active Ceased
  • 2022-12-07 US US18/717,320 patent/US20250041937A1/en active Pending
  • 2022-12-07 CN CN202280081495.8A patent/CN118369172A/zh active Pending
  • 2022-12-07 EP EP22844249.7A patent/EP4444489A1/de active Pending

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