CN115058626B - Cobalt-based superalloy suitable for additive manufacturing - Google Patents

Cobalt-based superalloy suitable for additive manufacturing Download PDF

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CN115058626B
CN115058626B CN202110249391.0A CN202110249391A CN115058626B CN 115058626 B CN115058626 B CN 115058626B CN 202110249391 A CN202110249391 A CN 202110249391A CN 115058626 B CN115058626 B CN 115058626B
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cobalt
equal
less
based superalloy
10ppm
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CN115058626A (en
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孔见
张子博
朱瑞
汪奇鹏
魏志祥
陈新胜
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Nanjing University of Science and Technology
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    • 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
    • C22C19/07—Alloys based on nickel or cobalt based on cobalt
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B33—ADDITIVE MANUFACTURING TECHNOLOGY
    • B33Y—ADDITIVE MANUFACTURING, i.e. MANUFACTURING OF THREE-DIMENSIONAL [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D 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 [3-D] OBJECTS BY ADDITIVE DEPOSITION, ADDITIVE AGGLOMERATION OR ADDITIVE LAYERING, e.g. BY 3-D PRINTING, STEREOLITHOGRAPHY OR SELECTIVE LASER SINTERING
    • B33Y70/00—Materials specially adapted for additive manufacturing
    • 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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C30/00—Alloys containing less than 50% by weight of each constituent
    • 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

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  • Mechanical Engineering (AREA)
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  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials For Medical Uses (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

The invention discloses a cobalt-based superalloy suitable for additive manufacturing, which comprises the following chemical components in percentage by mass: fe:14.0 to 15.5%, cr: 14.2-15.5%, ni: 17.0-19.0%, mo: 3.5-5.0%, ti: 0.5-1.0%, al:3.0 to 4.0%, ta: 0.5-1.0%, W: 2.3-4.0%, nb: 0.5-1.0%, re: 0.1-0.5%, C: 0.02-0.05%, B: 0.001-0.08%, O is less than or equal to 10ppm, N is less than or equal to 10ppm, P is less than or equal to 10ppm, S is less than or equal to 10ppm, O+N+S is less than or equal to 25ppm, and the balance is Co. The cobalt-based superalloy has good manufacturability in the process of material addition, and the prepared structural complex piece has no defects such as cracks, air holes and the like.

Description

Cobalt-based superalloy suitable for additive manufacturing
Technical Field
The patent invention discloses a cobalt-based superalloy suitable for additive manufacturing, and belongs to the technical field of metal materials.
Background
The additive manufacturing technology (Additive Manufacturing, AM) is a high-new technology which integrates the contents of a computer, materials, three-dimensional digital modeling and the like, and is a manufacturing technology for manufacturing solid objects by stacking special metal materials, nonmetal materials and medical biological materials layer by layer in the modes of extrusion, sintering, melting, photo-curing, spraying and the like through a software and numerical control system. The method is a near-forming technology of complex parts, so that the method has the advantages of high material utilization rate, shorter manufacturing period, capability of manufacturing complex parts and the like, and has a certain application prospect in the field of aerospace.
The cobalt-based superalloy has higher strength, good thermal fatigue resistance, thermal corrosion resistance and wear resistance at high temperature, and has higher thermal conductivity and lower thermal expansion performance compared with nickel-based superalloy, and is widely used for manufacturing guide blades and nozzle guide vanes of aviation jet engines, industrial gas turbine ship gas turbines, diesel engine nozzles and the like. The additive manufacturing technology and the cobalt-based superalloy are organically combined, so that more complex structural parts in the aeroengine can be manufactured more conveniently, and the manufactured cobalt-based superalloy parts have good heat resistance, wear resistance and corrosion resistance, and have important practical value and strategic significance for manufacturing of complex high-temperature structural parts and popularization and use of the cobalt-based superalloy.
At present, the cobalt-based superalloy suitable for additive manufacturing is extremely limited, the traditional cobalt-based superalloy has the defects of poor manufacturability, easy deformation, air hole crack generation and the like in the additive manufacturing process, and also shows larger stress in a large-scale component, so that the traditional cobalt-based superalloy is difficult to be suitable for additive manufacturing.
Disclosure of Invention
In order to solve the problem of poor formability and manufacturability in the process of adding materials to the cobalt-based superalloy, the invention aims to provide the cobalt-based superalloy suitable for additive manufacturing and a preparation method thereof, and samples manufactured by the additive manufacturing have no defects of cracks, air holes and the like, and have good printing manufacturability, high strength, high plasticity and excellent high-temperature performance.
The technical solution for realizing the purpose of the invention is as follows:
the cobalt-based superalloy suitable for additive manufacturing comprises the following chemical components in percentage by mass: fe:14.0 to 15.5 percent, cr:14.2 to 15.5 percent of Ni:17.0 to 19.0 percent, mo:3.5 to 5.0 percent of Ti:0.5 to 1.0 percent, al:3.0 to 4.0 percent, ta:0.5 to 1.0 percent, W:2.3 to 4.0 percent, nb:0.5 to 1.0 percent, re:0.1 to 0.5 percent, C: 0.02-0.05%, B: 0.001-0.08 percent, less than or equal to 10ppm of O, less than or equal to 10ppm of N, less than or equal to 10ppm of P, less than or equal to 10ppm of S, less than or equal to 25ppm of O+N+S, and the balance of Co.
The preparation method of the cobalt-based superalloy suitable for additive manufacturing specifically comprises the following steps:
preparing a cobalt alloy block from a 0.8-1.2 mm cobalt-based superalloy wire by using a cold metal transition welding technology (CMT), setting a wire feeding speed of 4.5-5.5 m/min, a cladding speed of 45-50 cm/min, and a welding current of 120-140A, and additively manufacturing a block sample of the cobalt-based alloy on a substrate, wherein each layer of welding bead of the block is perpendicular to the next layer of welding bead.
Preferably, a cobalt-based superalloy wire with the thickness of 0.8-1.2 mm is used for preparing a cobalt alloy block by using a cold metal transition welding technology (CMT), the wire feeding speed is set to be 4.5m/min, the cladding speed is set to be 45cm/min, the welding current is set to be 100A, a block sample of the cobalt-based alloy is additively manufactured on a substrate, and each layer of welding bead of the block is perpendicular to the next layer of welding bead.
The invention also provides a preparation method of the cobalt-based superalloy suitable for additive manufacturing, which specifically comprises the following steps:
preparing cobalt alloy blocks from cobalt-based superalloy powder with the diameter of 15-53 mu m by using a laser selective melting technology (SLM), setting the laser power to be 100-120W, selecting island scanning with the light spot diameter of 180 mu m, scanning at the speed of 350-400 mm/s and the scanning interval of 120-130 mu m, and manufacturing the block samples of the cobalt-based alloy on a substrate in an additive way.
Preferably, cobalt-based superalloy powder with the diameter of 15-53 μm is melted by a laser selective area to prepare a cobalt alloy component, the laser power is set to be 100W, island scanning with the spot diameter of 180 μm is selected, the scanning speed is 380mm/s, the scanning interval is 120 μm, and a blank sample is obtained on a substrate in an additive mode.
Compared with the prior art, the invention has the beneficial effects that:
the invention designs the cobalt-based superalloy suitable for additive manufacturing, the alloy system has good printing manufacturability, and the prepared sample has no defects such as cracks, air holes and the like. The block-shaped additive body obtained by additive manufacturing after wire or powder manufacturing is parallel to the direction of a substrate, the room temperature tensile strength, the yield strength and the elongation after fracture are 942-985 MPa, 432-490 MPa and 42-50%, the 950 ℃ tensile strength, the yield strength and the elongation after fracture are 446-486 MPa, 205-265 MPa and 47-57%, the maximum deformation of the additive body under the test condition of 950 ℃/100h is 50-63 MPa, and the lasting time under the test condition of 950 ℃/70MPa is 321-355 h. The direction of the additive body perpendicular to the substrate is 920-970 MPa, 412-480 MPa and 53-61% of room temperature tensile strength, 412-242 MPa, 58-70% of yield strength and 53-456 MPa of elongation after breaking, the creep limit of the additive body with the maximum deformation not exceeding 1% under 950 ℃/100h test condition is 47-60 MPa, and the lasting time under 950 ℃/70MPa test condition is 300-345 h. In a word, the sample produced by the cobalt-based alloy additive has better printing manufacturability and formability, and the additive body has high strength, high plasticity and excellent high-temperature performance.
Detailed Description
The invention provides a cobalt-based superalloy suitable for additive manufacturing, which contains Cr, fe, ni, mo, al, ti, nb, ta, W, re, C, B and other alloy elements, and the prepared additive has good printing manufacturability, formability, excellent bulk performance, high strength, high plasticity and excellent high-temperature performance.
The cobalt-based superalloy suitable for additive manufacturing comprises the following chemical components in percentage by mass: fe:14.0 to 15.5 percent, cr:14.2 to 15.5 percent of Ni:17.0 to 19.0 percent, mo:3.5 to 5.0 percent of Ti:0.5 to 1.0 percent, al:3.0 to 4.0 percent, ta:0.5 to 1.0 percent, W:2.3 to 4.0 percent, nb:0.5 to 1.0 percent, re:0.1 to 0.5 percent, C: 0.02-0.05%, B: 0.001-0.08 percent, less than or equal to 10ppm of O, less than or equal to 10ppm of N, less than or equal to 10ppm of P, less than or equal to 10ppm of S, less than or equal to 25ppm of O+N+S, and the balance of Co.
Wherein Cr element improves the oxidation resistance and corrosion resistance of the alloy, ni element enables gamma austenite to exist stably, mo element, W element and Nb element play a solid solution strengthening role, ti element and Al element are added to form a dispersed gamma' phase precipitation strengthening phase, B element is added to strengthen a crystal boundary, C element, re element and Fe element are added to optimize the alloy performance, ta element is added to enable gamma phase to remain stable under high temperature condition, co element is an alloy matrix, and O, C, P, S is an impurity element. A great number of research experiments show that the alloy elements have synergistic interaction, and the prepared cobalt-based superalloy has good manufacturability and excellent mechanical property in the process of material addition within the range of the alloy elements.
The preparation method of the cobalt-based superalloy suitable for additive manufacturing specifically comprises the following steps:
(1) Preparing a material required by cobalt alloy according to the designed components;
(2) Smelting the prepared materials in a vacuum smelting furnace, and casting the materials into solid bars;
(3) Rolling and drawing the cast bar for multiple times to prepare a cobalt alloy wire with the diameter of 0.8-1.2 mm;
(4) Preparing a cobalt alloy block from a cobalt alloy wire with the thickness of 0.8-1.2 mm by using a cold metal transition welding technology (CMT), setting the wire feeding speed to be 4.5-5.5 m/min, the cladding speed to be 45-50 cm/min, and the welding current to be 120-140A, and additively manufacturing a block sample of the cobalt-base alloy on a substrate, wherein each layer of welding bead of the block is perpendicular to the next layer of welding bead.
The invention also provides a preparation method of the cobalt-based superalloy suitable for additive manufacturing, which specifically comprises the following steps:
(1) Preparing a material required by cobalt alloy according to the designed components;
(2) Smelting the prepared materials in a vacuum smelting furnace, and casting the materials into solid bars;
(3) Putting the bar into an atomizing furnace, and preparing cobalt alloy powder by adopting a vacuum inert gas atomization technology;
(4) Screening the prepared powder, and selecting cobalt alloy powder with the diameter of 15-53 mu m for additive manufacturing;
(5) Preparing cobalt alloy blocks from cobalt alloy powder with the diameter of 15-53 mu m by using a laser selective area melting (SLM) technology, setting the laser power to be 100-120W, selecting island scanning with the light spot diameter of 180 mu m, scanning at the speed of 350-400 mm/s and the scanning interval of 120-130 mu m, and additively manufacturing the cobalt-base alloy block samples on a substrate.
Example 1:
the cobalt-based superalloy suitable for additive manufacturing comprises the following chemical components in percentage by mass: al:3.2%, fe:14.0%, mo:4.4%, cr:14.8%, ni:18.0%, ti:0.4%, ta:0.6%, W:3.1%, nb:0.6%, re:0.1%, C:0.02%, B:0.05 percent, less than or equal to 10ppm of O, less than or equal to 10ppm of N, less than or equal to 10ppm of P, less than or equal to 10ppm of S, less than or equal to 25ppm of O+N+S, and the balance of Co.
A cobalt-based superalloy was produced into a wire having a diameter of 0.8mm, additive manufacturing of the wire was performed using CMT, a wire feed speed of 4.5m/s, a welding current of 120A, and a cladding speed of 45cm/min were set, and a block sample having a size of 20X 20cm was deposited on the substrate. And each layer of welding bead is perpendicular to the next layer of welding bead, and the prepared sample is cut into two types of samples parallel to the substrate and perpendicular to the substrate, so that the performance of the sample can be conveniently analyzed.
And (3) preparing a metallographic specimen to observe microscopic structures of the specimen, wherein the structures of the additive body parallel to the substrate direction are equiaxed crystals, and the structures of the additive body perpendicular to the substrate direction are columnar crystals. The sample has no obvious defects of air holes, cracks and the like, and the manufacturability is good in the process of material addition.
According to the national standard of the tensile test, the block is manufactured into a tensile test sample which meets the national standard, and the tensile property test is carried out, wherein the room temperature tensile strength, the yield strength and the elongation after breaking are 942MPa, 432MPa and 47% respectively, the tensile strength at 950 ℃, the yield strength and the elongation after breaking are 456MPa, 218MPa and 51% respectively, the lasting time is 335h under the test condition of 950 ℃/70MPa, and the creep limit of which the maximum deformation is not more than 1% under the test condition of 950 ℃/100h is 56MPa. The room temperature tensile strength, the yield strength and the elongation after break of the additive body in the direction perpendicular to the substrate are 931MPa, 412MPa and 58 percent respectively, the tensile strength at 950 ℃, the yield strength and the elongation after break are 436MPa, 201MPa and 61 percent respectively, the lasting time is 324h under the test condition of 950 ℃/70MPa, and the creep limit of which the maximum deformation is not more than 1 percent under the test condition of 950 ℃/100h is 53MPa.
Example 2:
The cobalt-based superalloy suitable for additive manufacturing comprises the following chemical components in percentage by mass: al:3.6%, fe:15.5%, mo:4.6%, cr:14.6%, ni:18.1%, ti:0.5%, ta:0.7%, W:3.0%, nb:0.8%, re:0.3%, C:0.03%, B:0.04 percent, O is less than or equal to 10ppm, N is less than or equal to 10ppm, P is less than or equal to 10ppm, S is less than or equal to 10ppm, O+N+S is less than or equal to 25ppm, and the balance is Co.
The cobalt-based superalloy was produced into a wire with a diameter of 1mm, the additive manufacturing of the wire was performed using CMT, a wire feed speed of 5.0m/s, a welding current of 125A, and a cladding speed of 50cm/min were set, and a block sample with a size of 20X 20cm was deposited on the substrate. And each layer of welding bead is perpendicular to the next layer of welding bead, and the prepared sample is cut into two types of samples parallel to the substrate and perpendicular to the substrate, so that the performance of the sample can be conveniently analyzed.
And (3) preparing a metallographic specimen to observe microscopic structures of the specimen, wherein the structures of the additive body parallel to the substrate direction are equiaxed crystals, and the structures of the additive body perpendicular to the substrate direction are columnar crystals. The sample has no obvious defects of air holes, cracks and the like, and the manufacturability is good in the process of material addition.
According to the national standard of the tensile test, the block is prepared into a tensile test sample which meets the national standard, and the tensile property test is carried out, wherein the room temperature tensile strength, the yield strength and the elongation after breaking are 956MPa, 434MPa and 49% respectively, the tensile strength at 950 ℃ and the yield strength after breaking are 460MPa, 220MPa and 52% respectively, the lasting time is 334h under the test condition of 950 ℃/70MPa, and the creep limit of which the maximum deformation is not more than 1% under the test condition of 950 ℃/100h is 57MPa. The room temperature tensile strength, the yield strength and the elongation after break of the additive body in the direction perpendicular to the substrate are respectively 920MPa, 435MPa and 59%, the tensile strength at 950 ℃, the yield strength and the elongation after break are respectively 440MPa, 206MPa and 64%, the lasting time under the test condition of 950 ℃/70MPa is 323h, and the creep limit of which the maximum deformation is not more than 1% under the test condition of 950 ℃/100h is 52MPa.
Example 3:
the cobalt-based superalloy suitable for additive manufacturing comprises the following chemical components in percentage by mass: al:4.0%, fe:15.2%, mo:3.0%, cr:15.5%, ni:18.5%, ti:0.9%, ta:0.8%, W:3.2%, nb:0.9%, re:0.5%, C:0.05%, B:0.06 percent, O is less than or equal to 10ppm, N is less than or equal to 10ppm, P is less than or equal to 10ppm, S is less than or equal to 10ppm, O+N+S is less than or equal to 25ppm, and the balance is Co.
Preparing a cobalt-based superalloy into a wire with the diameter of 1mm, performing additive manufacturing on the wire by using CMT, the wire feeding speed was set to 5.0m/s, the welding current was set to 130A, the cladding speed was set to 50cm/min, and a block sample of 20X 20cm in size was deposited on the substrate. And each layer of welding bead is perpendicular to the next layer of welding bead, and the prepared sample is cut into two types of samples parallel to the substrate and perpendicular to the substrate, so that the performance of the sample can be conveniently analyzed.
And (3) preparing a metallographic specimen to observe microscopic structures of the specimen, wherein the structures of the additive body parallel to the substrate direction are equiaxed crystals, and the structures of the additive body perpendicular to the substrate direction are columnar crystals. The sample has no obvious defects of air holes, cracks and the like, and the manufacturability is good in the process of material addition.
According to the national standard of the tensile test, the block is manufactured into a tensile test sample which meets the national standard, and the tensile property test is carried out, wherein the room temperature tensile strength, the yield strength and the elongation after breaking are 980MPa, 490MPa and 50% respectively, the tensile strength at 950 ℃, the yield strength and the elongation after breaking are 486MPa, 265MPa and 56% respectively, the lasting time is 355h under the test condition of 950 ℃/70MPa, and the creep limit of which the maximum deformation is not more than 1% under the test condition of 950 ℃/100h is 63MPa. The room temperature tensile strength, the yield strength and the elongation after break of the additive body in the direction perpendicular to the substrate are 970MPa, 480MPa and 61 percent respectively, the tensile strength at 950 ℃ is 456MPa, the yield strength and the elongation after break are 70 percent respectively, the lasting time under the test condition of 950 ℃/70MPa is 345h, and the creep limit of which the maximum deformation is not more than 1 percent under the test condition of 950 ℃/100h is 60MPa.
Example 4:
the cobalt-based superalloy suitable for additive manufacturing comprises the following chemical components in percentage by mass: al:4.0%, fe:14.5%, mo:5.0%, cr:14.6%, ni:18.0%, ti:0.6%, ta:0.8%, W:3.4%, nb:0.7%, re:0.4%, C:0.03%, B:0.05 percent, less than or equal to 10ppm of O, less than or equal to 10ppm of N, less than or equal to 10ppm of P, less than or equal to 10ppm of S, less than or equal to 25ppm of O+N+S, and the balance of Co.
A cobalt-based superalloy was produced into a wire having a diameter of 1.2mm, additive manufacturing of the wire was performed using CMT, a wire feed speed of 5.5m/s, a welding current of 140A, and a cladding speed of 50cm/min were set, and a block sample having a size of 20X 20cm was deposited on the substrate. And each layer of welding bead is perpendicular to the next layer of welding bead, and the prepared sample is cut into two types of samples parallel to the substrate and perpendicular to the substrate, so that the performance of the sample can be conveniently analyzed.
And (3) preparing a metallographic specimen to observe microscopic structures of the specimen, wherein the structures of the additive body parallel to the substrate direction are equiaxed crystals, and the structures of the additive body perpendicular to the substrate direction are columnar crystals. The sample has no obvious defects of air holes, cracks and the like, and the manufacturability is good in the process of material addition.
According to the national standard of the tensile test, the block is manufactured into a tensile test sample which meets the national standard, and the tensile property test is carried out, wherein the room temperature tensile strength, the yield strength and the elongation after breaking are 975MPa, 452MPa and 46 percent respectively, the tensile strength at 950 ℃ and the yield strength after breaking are 471MPa, 236MPa and 52 percent respectively, the lasting time is 348 h under the test condition of 950 ℃/70MPa, and the creep limit of which the maximum deformation is not more than 1 percent under the test condition of 950 ℃/100h is 59MPa. The room temperature tensile strength, the yield strength and the elongation after break of the additive body in the direction perpendicular to the substrate are 945MPa, 440MPa and 57%, the tensile strength at 950 ℃, the yield strength and the elongation after break are 451MPa, 216MPa and 63%, the lasting time under the test condition of 950 ℃/70MPa is 335h, and the creep limit of which the maximum deformation is not more than 1% under the test condition of 950 ℃/100h is 56MPa.
Example 5:
the cobalt-based superalloy suitable for additive manufacturing comprises the following chemical components in percentage by mass: al:3.6%, fe:14.8%, mo:4.7%, cr:14.2%, ni:18.8%, ti:0.6%, ta:0.7%, W:3.1%, nb:0.5%, re:0.2%, C:0.03%, B:0.04 percent, O is less than or equal to 10ppm, N is less than or equal to 10ppm, P is less than or equal to 10ppm, S is less than or equal to 10ppm, O+N+S is less than or equal to 25ppm, and the balance is Co.
A cobalt-based superalloy was produced into a wire having a diameter of 0.8mm, additive manufacturing of the wire was performed using CMT, a wire feed speed of 4.5m/s, a welding current of 120A, and a cladding speed of 45cm/min were set, and a block sample having a size of 20X 20cm was deposited on the substrate. And each layer of welding bead is perpendicular to the next layer of welding bead, and the prepared sample is cut into two types of samples parallel to the substrate and perpendicular to the substrate, so that the performance of the sample can be conveniently analyzed.
And (3) preparing a metallographic specimen to observe microscopic structures of the specimen, wherein the structures of the additive body parallel to the substrate direction are equiaxed crystals, and the structures of the additive body perpendicular to the substrate direction are columnar crystals. The sample has no obvious defects of air holes, cracks and the like, and the manufacturability is good in the process of material addition.
According to the national standard of the tensile test, the block is manufactured into a tensile test sample which meets the national standard, and the tensile property test is carried out, wherein the room temperature tensile strength, the yield strength and the elongation after breaking are 970MPa, 475MPa and 45 percent respectively, the tensile strength at 950 ℃, the yield strength and the elongation after breaking are 470MPa, 233MPa and 51 percent respectively, the lasting time is 343 hours under the test condition of 950 ℃/70MPa, and the creep limit of which the maximum deformation is not more than 1 percent under the test condition of 950 ℃/100 hours is 57MPa. The room temperature tensile strength, yield strength and elongation after break of the additive body in the direction perpendicular to the substrate are 944MPa, 445MPa and 56%, the tensile strength at 950 ℃, the yield strength and the elongation after break are 450MPa, 213MPa and 65%, the lasting time under the test condition of 950 ℃/70MPa is 333h, and the creep limit of the maximum deformation of not more than 1% under the test condition of 950 ℃/100h is 55MPa.
Example 6:
the cobalt-based superalloy suitable for additive manufacturing comprises the following chemical components in percentage by mass: al:3.4%, fe:14.6%, mo:4.4%, cr:15.5%, ni:18.2%, ti:0.5%, ta:0.6%, W:3.2%, nb:0.8%, re:0.1%, C:0.02%, B:0.05 percent, less than or equal to 10ppm of O, less than or equal to 10ppm of N, less than or equal to 10ppm of P, less than or equal to 10ppm of S, less than or equal to 25ppm of O+N+S, and the balance of Co.
The cobalt-based superalloy was produced into a wire with a diameter of 1mm, the additive manufacturing of the wire was performed using CMT, a wire feed speed of 5.0m/s, a welding current of 125A, and a cladding speed of 50cm/min were set, and a block sample with a size of 20X 20cm was deposited on the substrate. And each layer of welding bead is vertical to the next layer of welding bead, and the prepared samples are cut into two types of samples parallel to the substrate and perpendicular to the substrate, so that the performance of the samples can be conveniently analyzed.
And (3) preparing a metallographic specimen to observe microscopic structures of the specimen, wherein the structures of the additive body parallel to the substrate direction are equiaxed crystals, and the structures of the additive body perpendicular to the substrate direction are columnar crystals. The sample has no obvious defects of air holes, cracks and the like, and the manufacturability is good in the process of material addition.
According to the national standard of the tensile test, the block is prepared into a tensile test sample which meets the national standard, and the tensile property test is carried out, wherein the room temperature tensile strength, the yield strength and the elongation after breaking are 965MPa, 449MPa and 46% respectively, the tensile strength at 950 ℃ and the yield strength after breaking are 468MPa, 229MPa and 50% respectively, the lasting time is 340h under the test condition of 950 ℃/70MPa, and the creep limit of which the maximum deformation is not more than 1% under the test condition of 950 ℃/100h is 58MPa. The room temperature tensile strength, the yield strength and the elongation after break of the additive body in the direction perpendicular to the substrate are 936MPa, 443MPa and 58 percent respectively, the tensile strength at 950 ℃ and the yield strength and the elongation after break are 448MPa, 219MPa and 63 percent respectively, the lasting time is 320h under the test condition of 950 ℃/70MPa, and the creep limit of which the maximum deformation is not more than 1 percent under the test condition of 950 ℃/100h is 56MPa.
Example 7:
the cobalt-based superalloy suitable for additive manufacturing comprises the following chemical components in percentage by mass: al:3.3%, fe:14.6%, mo:4.0%, cr:14.6%, ni:17.0%, ti:0.6%, ta:0.7%, W:3.2%, nb:0.7%, re:0.3%, C:0.04%, B:0.06 percent, O is less than or equal to 10ppm, N is less than or equal to 10ppm, P is less than or equal to 10ppm, S is less than or equal to 10ppm, O+N+S is less than or equal to 25ppm, and the balance is Co.
Preparing a cobalt-based superalloy into a wire with the diameter of 1mm, performing additive manufacturing on the wire by using CMT, the wire feeding speed was set to 5.0m/s, the welding current was set to 130A, the cladding speed was set to 50cm/min, and a block sample of 20X 20cm in size was deposited on the substrate. And each layer of welding bead is perpendicular to the next layer of welding bead, and the prepared sample is cut into two types of samples parallel to the substrate and perpendicular to the substrate, so that the performance of the sample can be conveniently analyzed.
And (3) preparing a metallographic specimen to observe microscopic structures of the specimen, wherein the structures of the additive body parallel to the substrate direction are equiaxed crystals, and the structures of the additive body perpendicular to the substrate direction are columnar crystals. The sample has no obvious defects of air holes, cracks and the like, and the manufacturability is good in the process of material addition.
According to the national standard of the tensile test, the block is manufactured into a tensile test sample which meets the national standard, and the tensile property test is carried out, wherein the room temperature tensile strength, the yield strength and the elongation after breaking are 978MPa, 456MPa and 47% respectively, the tensile strength at 950 ℃ and the yield strength after breaking are 463MPa, 220MPa and 50% respectively, the lasting time is 334h under the test condition of 950 ℃/70MPa, and the creep limit of which the maximum deformation is not more than 1% under the test condition of 950 ℃/100h is 56MPa. The room temperature tensile strength, the yield strength and the elongation after break of the additive body in the direction perpendicular to the substrate are 948MPa, 426MPa and 60 percent respectively, the tensile strength at 950 ℃ and the yield strength and the elongation after break are 440MPa, 209MPa and 59 percent respectively, the lasting time is 324h under the test condition of 950 ℃/70MPa, and the creep limit of which the maximum deformation is not more than 1 percent under the test condition of 950 ℃/100h is 53MPa.
Example 8:
the cobalt-based superalloy suitable for additive manufacturing comprises the following chemical components in percentage by mass: al:3.3%, fe:14.6%, mo:4.2%, cr:15.0%, ni:19.0%, ti:0.7%, ta:0.9%, W:3.1%, nb:0.7%, re:0.2%, C:0.03%, B:0.04 percent, O is less than or equal to 10ppm, N is less than or equal to 10ppm, P is less than or equal to 10ppm, S is less than or equal to 10ppm, O+N+S is less than or equal to 25ppm, and the balance is Co.
A cobalt-based superalloy was produced into a wire having a diameter of 1.2mm, additive manufacturing of the wire was performed using CMT, a wire feed speed of 5.5m/s, a welding current of 140A, and a cladding speed of 50cm/min were set, and a block sample having a size of 20X 20cm was deposited on the substrate. And each layer of welding bead is perpendicular to the next layer of welding bead, and the prepared sample is cut into two types of samples parallel to the substrate and perpendicular to the substrate, so that the performance of the sample can be conveniently analyzed.
And (3) preparing a metallographic specimen to observe microscopic structures of the specimen, wherein the structures of the additive body parallel to the substrate direction are equiaxed crystals, and the structures of the additive body perpendicular to the substrate direction are columnar crystals. The sample has no obvious defects of air holes, cracks and the like, and the manufacturability is good in the process of material addition.
According to the national standard of the tensile test, the block is manufactured into a tensile test sample which meets the national standard, and the tensile property test is carried out, wherein the room temperature tensile strength, the yield strength and the elongation after breaking are 970MPa, 449MPa and 46 percent respectively, the tensile strength at 950 ℃ and the yield strength after breaking are 457MPa, 217MPa and 49 percent respectively, the lasting time is 330h under the test condition of 950 ℃/70MPa, and the maximum deformation is not more than 1 percent under the test condition of 950 ℃/100h and the creep limit is 53MPa. The room temperature tensile strength, the yield strength and the elongation after break of the additive body in the direction perpendicular to the substrate are 938MPa, 428MPa and 57%, the tensile strength at 950 ℃, the yield strength and the elongation after break are 426MPa, 205MPa and 60%, the lasting time is 320h under the test condition of 950 ℃/70MPa, and the creep limit of which the maximum deformation is not more than 1% under the test condition of 950 ℃/100h is 50MPa.
Example 9:
the cobalt-based superalloy suitable for additive manufacturing comprises the following chemical components in percentage by mass: al:3.6%, fe:14.8%, mo:4.2%, cr:15.3%, ni:18.0%, ti:0.8%, ta:0.5%, W:3.5%, nb:0.6%, re:0.3%, C:0.02%, B:0.05 percent, less than or equal to 10ppm of O, less than or equal to 10ppm of N, less than or equal to 10ppm of P, less than or equal to 10ppm of S, less than or equal to 25ppm of O+N+S, and the balance of Co.
Preparing cobalt-based superalloy into cobalt-based superalloy powder with the diameter of 15-53 mu m, preparing a cobalt-based superalloy block by using a laser selective melting technology, setting the laser power to be 100W, selecting island scanning with the diameter of 180 mu m, scanning at the speed of 350mm/s and the scanning interval of 120 mu m, and adding a block sample with the size of 20 multiplied by 20cm on a substrate. The prepared samples are cut into two types of samples parallel to the substrate and perpendicular to the substrate, so that the performance of the samples can be conveniently analyzed.
And (3) preparing a metallographic specimen to observe microscopic structures of the specimen, wherein the structures of the additive body parallel to the substrate direction are equiaxed crystals, and the structures of the additive body perpendicular to the substrate direction are columnar crystals. The sample has no obvious defects of air holes, cracks and the like, and the manufacturability is good in the process of material addition.
According to the national standard of the tensile test, the block is manufactured into a tensile test sample which meets the national standard, and the tensile property test is carried out, wherein the room-temperature tensile strength, the yield strength and the elongation after breaking are 960MPa, 445MPa and 45% respectively, the tensile strength at 950 ℃, the yield strength and the elongation after breaking are 450MPa, 210MPa and 48% respectively, the lasting time is 328h under the test condition of 950 ℃/70MPa, and the creep limit of which the maximum deformation is not more than 1% under the test condition of 950 ℃/100h is 50MPa. The room temperature tensile strength, yield strength and elongation after break of the additive body in the direction perpendicular to the substrate are 930MPa, 423MPa and 55%, the tensile strength at 950 ℃ is 430MPa, 220MPa and 59%, the endurance time is 318h under the test condition of 950 ℃/70MPa, and the creep limit of the maximum deformation of not more than 1% under the test condition of 950 ℃/100h is 47MPa.
Example 10:
the cobalt-based superalloy suitable for additive manufacturing comprises the following chemical components in percentage by mass: al:3.5%, fe:14.3%, mo:3.9%, cr:14.8%, ni:17.9%, ti:0.6%, ta:1.0%, W:3.5%, nb:0.5%, re:0.4%, C:0.03%, B:0.04 percent, O is less than or equal to 10ppm, N is less than or equal to 10ppm, P is less than or equal to 10ppm, S is less than or equal to 10ppm, O+N+S is less than or equal to 25ppm, and the balance is Co.
Preparing cobalt-based superalloy into cobalt-based superalloy powder with the diameter of 15-53 mu m, preparing a cobalt-based superalloy block by using a laser selective melting technology, setting the laser power to be 110W, selecting island scanning with the diameter of 180 mu m, scanning at the speed of 400mm/s and the scanning interval of 130 mu m, and adding a block sample with the size of 20 multiplied by 20cm on a substrate. The prepared samples are cut into two types of samples parallel to the substrate and perpendicular to the substrate, so that the performance of the samples can be conveniently analyzed.
And (3) preparing a metallographic specimen to observe microscopic structures of the specimen, wherein the structures of the additive body parallel to the substrate direction are equiaxed crystals, and the structures of the additive body perpendicular to the substrate direction are columnar crystals. The sample has no obvious defects of air holes, cracks and the like, and the manufacturability is good in the process of material addition.
According to the national standard of the tensile test, the block is prepared into a tensile test sample which meets the national standard, and the tensile property test is carried out, wherein the room temperature tensile strength, the yield strength and the elongation after breaking are 972MPa, 447MPa and 46% respectively, the tensile strength at 950 ℃ and the yield strength after breaking are 469MPa, 226MPa and 52% respectively, the lasting time is 336h under the test condition of 950 ℃/70MPa, and the creep limit of which the maximum deformation is not more than 1% under the test condition of 950 ℃/100h is 56MPa. The room temperature tensile strength, the yield strength and the elongation after break of the additive body in the direction perpendicular to the substrate are 933MPa, 422MPa and 56 percent respectively, the tensile strength at 950 ℃ and the yield strength and the elongation after break are 449MPa, 209MPa and 63 percent respectively, the lasting time is 326h under the test condition of 950 ℃/70MPa, and the creep limit of which the maximum deformation is not more than 1 percent under the test condition of 950 ℃/100h is 53MPa.
Example 11:
the cobalt-based superalloy suitable for additive manufacturing comprises the following chemical components in percentage by mass: al:3.5%, fe:14.6%, mo:4.5%, cr:14.5%, ni:18.1%, ti:0.5%, ta:0.6%, W:2.3%, nb:0.8%, re:0.4%, C:0.04%, B:0.07 percent, less than or equal to 10ppm of O, less than or equal to 10ppm of N, less than or equal to 10ppm of P, less than or equal to 10ppm of S, less than or equal to 25ppm of O+N+S, and the balance of Co.
Preparing cobalt-based superalloy into cobalt-based superalloy powder with the diameter of 15-53 mu m, preparing a cobalt-based superalloy block by using a laser selective melting technology, setting the laser power to 105W, selecting island scanning with the diameter of 180 mu m, scanning at the speed of 380mm/s and the scanning interval of 125 mu m, and adding a block sample with the size of 20 multiplied by 20cm on a substrate. The prepared samples are cut into two types of samples parallel to the substrate and perpendicular to the substrate, so that the performance of the samples can be conveniently analyzed.
And (3) preparing a metallographic specimen to observe microscopic structures of the specimen, wherein the structures of the additive body parallel to the substrate direction are equiaxed crystals, and the structures of the additive body perpendicular to the substrate direction are columnar crystals. The sample has no obvious defects of air holes, cracks and the like, and the manufacturability is good in the process of material addition.
According to the national standard of the tensile test, the block is manufactured into a tensile test sample which meets the national standard, and the tensile property test is carried out, wherein the room temperature tensile strength, the yield strength and the elongation after breaking are 983MPa, 485MPa and 48 percent respectively, the tensile strength at 950 ℃ and the yield strength after breaking are 465MPa, 233MPa and 53 percent respectively, the lasting time is 330h under the test condition of 950 ℃/70MPa, and the creep limit of which the maximum deformation is not more than 1 percent under the test condition of 950 ℃/100h is 53MPa. The room temperature tensile strength, the yield strength and the elongation after break of the additive body in the direction perpendicular to the substrate are 937MPa, 430MPa and 58 percent respectively, the tensile strength at 950 ℃ and the yield strength and the elongation after break are 443MPa, 203MPa and 63 percent respectively, the lasting time is 310h under the test condition of 950 ℃/70MPa, and the creep limit of which the maximum deformation is not more than 1 percent under the test condition of 950 ℃/100h is 50MPa.
Example 12:
the cobalt-based superalloy suitable for additive manufacturing comprises the following chemical components in percentage by mass: al:3.4%, fe:14.7%, mo:3.9%, cr:14.9%, ni:18.3%, ti:0.5%, ta:0.8%, W:4.0%, nb:0.5%, re:0.2%, C:0.03%, B:0.05 percent, less than or equal to 10ppm of O, less than or equal to 10ppm of N, less than or equal to 10ppm of P, less than or equal to 10ppm of S, less than or equal to 25ppm of O+N+S, and the balance of Co.
Preparing cobalt-based superalloy into cobalt-based superalloy powder with the diameter of 15-53 mu m, preparing a cobalt-based superalloy block by using a laser selective melting technology, setting the laser power to be 100W, selecting island scanning with the diameter of 180 mu m, scanning at the speed of 370mm/s and the scanning interval of 120 mu m, and adding a block sample with the size of 20 multiplied by 20cm on a substrate. The prepared samples are cut into two types of samples parallel to the substrate and perpendicular to the substrate, so that the performance of the samples can be conveniently analyzed.
And (3) preparing a metallographic specimen to observe microscopic structures of the specimen, wherein the structures of the additive body parallel to the substrate direction are equiaxed crystals, and the structures of the additive body perpendicular to the substrate direction are columnar crystals. The sample has no obvious defects of air holes, cracks and the like, and the manufacturability is good in the process of material addition.
According to the national standard of the tensile test, the block is prepared into a tensile test sample which accords with the national standard, and the tensile property test is carried out, wherein the room-temperature tensile strength, the yield strength and the elongation after breaking are 951MPa, 433MPa and 42 percent respectively, the tensile strength at 950 ℃ and the yield strength and the elongation after breaking are 446MPa, 205MPa and 47 percent respectively, the lasting time is 321h under the test condition of 950 ℃/70MPa, and the creep limit of which the maximum deformation is not more than 1 percent under the test condition of 950 ℃/100h is 50MPa. The room temperature tensile strength, the yield strength and the elongation after break of the additive body in the direction perpendicular to the substrate are 921MPa, 416MPa and 53%, the tensile strength at 950 ℃, the yield strength and the elongation after break are 433MPa, 197MPa and 58%, the lasting time under the test condition of 950 ℃/70MPa is 300h, and the creep limit of the maximum deformation of not more than 1% under the test condition of 950 ℃/100h is 47MPa.
Example 13:
the cobalt-based superalloy suitable for additive manufacturing comprises the following chemical components in percentage by mass: al:3.5%, fe:14.7%, mo:4.1%, cr:14.8%, ni:18.1%, ti:0.5%, ta:0.6%, W:3.0%, nb:0.6%, re:0.4%, C:0.02%, B:0.001%, O is less than or equal to 10ppm, N is less than or equal to 10ppm, P is less than or equal to 10ppm, S is less than or equal to 10ppm, O+N+S is less than or equal to 25ppm, and the balance is Co.
Preparing cobalt-based superalloy into cobalt-based superalloy powder with the diameter of 15-53 mu m, preparing a cobalt-based superalloy block by using a laser selective melting technology, setting the laser power to be 115W, selecting island scanning with the diameter of 180 mu m, scanning at the speed of 370mm/s and the scanning interval of 120 mu m, and adding a block sample with the size of 20 multiplied by 20cm on a substrate. The prepared samples are cut into two types of samples parallel to the substrate and perpendicular to the substrate, so that the performance of the samples can be conveniently analyzed.
And (3) preparing a metallographic specimen to observe microscopic structures of the specimen, wherein the structures of the additive body parallel to the substrate direction are equiaxed crystals, and the structures of the additive body perpendicular to the substrate direction are columnar crystals. The sample has no obvious defects of air holes, cracks and the like, and the manufacturability is good in the process of material addition.
According to the national standard of the tensile test, the block is manufactured into a tensile test sample which meets the national standard, and the tensile property test is carried out, wherein the room temperature tensile strength, the yield strength and the elongation after breaking are 976MPa, 450MPa and 46 percent respectively, the tensile strength at 950 ℃ and the yield strength after breaking are 460MPa, 230MPa and 52 percent respectively, the endurance time is 340h under the test condition of 950 ℃/70MPa, and the maximum deformation is not more than 1 percent under the test condition of 950 ℃/100h and the creep limit is 57MPa. The room temperature tensile strength, the yield strength and the elongation after break of the additive body in the direction perpendicular to the substrate are 926MPa, 420MPa and 54%, the tensile strength at 950 ℃ and the yield strength and the elongation after break are 430MPa, 203MPa and 62%, the lasting time under the test condition of 950 ℃/70MPa is 320h, and the creep limit of the maximum deformation of not more than 1% under the test condition of 950 ℃/100h is 52MPa.
Example 14:
the cobalt-based superalloy suitable for additive manufacturing comprises the following chemical components in percentage by mass: al:3.6%, fe:14.6%, mo:4.2%, cr:14.9%, ni:17.8%, ti:0.6%, ta:0.7%, W:3.4%, nb:0.6%, re:0.2%, C:0.02%, B:0.08 percent, less than or equal to 10ppm of O, less than or equal to 10ppm of N, less than or equal to 10ppm of P, less than or equal to 10ppm of S, less than or equal to 25ppm of O+N+S, and the balance of Co.
Preparing cobalt-based superalloy into cobalt-based superalloy powder with the diameter of 15-53 mu m, preparing a cobalt-based superalloy block by using a laser selective melting technology, setting the laser power to be 120W, selecting island scanning with the diameter of 180 mu m, scanning at the speed of 370mm/s and the scanning interval to be 120 mu m, and adding a block sample with the size of 20 multiplied by 20cm on a substrate. The prepared samples are cut into two types of samples parallel to the substrate and perpendicular to the substrate, so that the performance of the samples can be conveniently analyzed.
And (3) preparing a metallographic specimen to observe microscopic structures of the specimen, wherein the structures of the additive body parallel to the substrate direction are equiaxed crystals, and the structures of the additive body perpendicular to the substrate direction are columnar crystals. The sample has no obvious defects of air holes, cracks and the like, and the manufacturability is good in the process of material addition.
According to the national standard of the tensile test, the block is manufactured into a tensile test sample which meets the national standard, and the tensile property test is carried out, wherein the room temperature tensile strength, the yield strength and the elongation after breaking are 985MPa, 480MPa and 50% respectively, the tensile strength at 950 ℃, the yield strength and the elongation after breaking are 485MPa, 264MPa and 57% respectively, the endurance time is 350h under the test condition of 950 ℃/70MPa, and the maximum deformation is not more than 1% under the test condition of 950 ℃/100h, and the creep limit is 63MPa. The room temperature tensile strength, the yield strength and the elongation after break of the additive body in the direction perpendicular to the substrate are 935MPa, 426MPa and 60%, the tensile strength at 950 ℃ is 451MPa, the yield strength and the elongation after break are 68% and 234MPa respectively, the lasting time is 330h under the test condition of 950 ℃/70MPa, and the creep limit of which the maximum deformation is not more than 1% under the test condition of 950 ℃/100h is 59MPa.
Example 15:
the cobalt-based superalloy suitable for additive manufacturing comprises the following chemical components in percentage by mass: al:3.0%, fe:14.8%, mo:4.2%, cr:15.0%, ni:18.0%, ti:0.7%, ta:0.6%, W:3.5%, nb:0.8%, re:0.3%, C:0.03%, B:0.05 percent, less than or equal to 10ppm of O, less than or equal to 10ppm of N, less than or equal to 10ppm of P, less than or equal to 10ppm of S, less than or equal to 25ppm of O+N+S, and the balance of Co.
Preparing cobalt-based superalloy into cobalt-based superalloy powder with the diameter of 15-53 mu m, preparing a cobalt-based superalloy block by using a laser selective melting technology, setting the laser power to be 115W, selecting island scanning with the diameter of 180 mu m, scanning at the speed of 380mm/s and the scanning interval of 120 mu m, and adding a block sample with the size of 20 multiplied by 20cm on a substrate. The prepared samples are cut into two types of samples parallel to the substrate and perpendicular to the substrate, so that the performance of the samples can be conveniently analyzed.
And (3) preparing a metallographic specimen to observe microscopic structures of the specimen, wherein the structures of the additive body parallel to the substrate direction are equiaxed crystals, and the structures of the additive body perpendicular to the substrate direction are columnar crystals. The sample has no obvious defects of air holes, cracks and the like, and the manufacturability is good in the process of material addition.
According to the national standard of the tensile test, the block is prepared into a tensile test sample which meets the national standard, and the tensile property test is carried out, wherein the room temperature tensile strength, the yield strength and the elongation after breaking are 981MPa, 476MPa and 49% respectively, the tensile strength at 950 ℃ and the yield strength after breaking are 479MPa, 241MPa and 54% respectively, the lasting time is 348 h under the test condition of 950 ℃/70MPa, and the creep limit of which the maximum deformation is not more than 1% under the test condition of 950 ℃/100h is 58MPa. The room temperature tensile strength, the yield strength and the elongation after break of the additive body in the direction perpendicular to the substrate are respectively 930MPa, 433MPa and 59%, the tensile strength at 950 ℃, the yield strength and the elongation after break are respectively 439MPa, 213MPa and 64%, the lasting time is 326h under the test condition of 950 ℃/70MPa, and the creep limit of which the maximum deformation is not more than 1% under the test condition of 950 ℃/100h is 55MPa.
Example 16:
the cobalt-based superalloy suitable for additive manufacturing comprises the following chemical components in percentage by mass: al:4.0%, fe:14.6%, mo:4.1%, cr:14.8%, ni:18.2%, ti:0.5%, ta:0.8%, W:3.4%, nb:0.6%, re:0.3%, C:0.04%, B:0.04 percent, O is less than or equal to 10ppm, N is less than or equal to 10ppm, P is less than or equal to 10ppm, S is less than or equal to 10ppm, O+N+S is less than or equal to 25ppm, and the balance is Co.
Preparing cobalt-based superalloy into cobalt-based superalloy powder with the diameter of 15-53 mu m, preparing a cobalt-based superalloy block by using a laser selective melting technology, setting the laser power to be 120W, selecting island scanning with the diameter of 180 mu m, scanning at the speed of 400mm/s and the scanning interval of 120 mu m, and adding a block sample with the size of 20 multiplied by 20cm on a substrate. The prepared samples are cut into two types of samples parallel to the substrate and perpendicular to the substrate, so that the performance of the samples can be conveniently analyzed.
And (3) preparing a metallographic specimen to observe microscopic structures of the specimen, wherein the structures of the additive body parallel to the substrate direction are equiaxed crystals, and the structures of the additive body perpendicular to the substrate direction are columnar crystals. The sample has no obvious defects of air holes, cracks and the like, and the manufacturability is good in the process of material addition.
According to the national standard of the tensile test, the block is prepared into a tensile test sample which meets the national standard, and the tensile property test is carried out, wherein the room temperature tensile strength, the yield strength and the elongation after breaking are 973MPa, 450MPa and 46 percent respectively, the tensile strength at 950 ℃ and the yield strength after breaking are 463MPa, 230MPa and 53 percent respectively, the lasting time is 338 hours under the test condition of 950 ℃/70MPa, and the creep limit of which the maximum deformation is not more than 1 percent under the test condition of 950 ℃/100 hours is 56MPa. The room temperature tensile strength, the yield strength and the elongation after break of the additive body in the direction perpendicular to the substrate are 924MPa, 419MPa and 55%, the tensile strength at 950 ℃ is 433MPa, 200MPa and 62%, the lasting time under the test condition of 950 ℃/70MPa is 318h, and the creep limit of the maximum deformation of not more than 1% under the test condition of 950 ℃/100h is 51MPa.
Example 17:
the cobalt-based superalloy suitable for additive manufacturing comprises the following chemical components in percentage by mass: al:3.5%, fe:14.6%, mo:4.0%, cr:14.8%, ni:18.0%, ti:0.6%, ta:0.7%, W:3.4%, nb:0.7%, re:0.2%, C:0.03%, B:0.07 percent, less than or equal to 10ppm of O, less than or equal to 10ppm of N, less than or equal to 10ppm of P, less than or equal to 10ppm of S, less than or equal to 25ppm of O+N+S, and the balance of Co.
Preparing a cobalt-based alloy into a wire with the diameter of 0.8mm, performing additive manufacturing on the wire by using CMT, setting the wire feeding speed to be 4.5m/s, the welding current to be 120A, the cladding speed to be 45cm/min, overlaying a turbine disc blank sample with the diameter of 0.5m on a substrate, and performing machining to obtain a turbine disc finished product.
The blank of the turbine disc with the additive material has no deformation and cracking. The X-ray nondestructive testing analysis result of the machined turbine disc finished product shows that the additive sample has no defects such as cracks, air holes and the like.
When the traditional high-temperature alloy wire GH5188 additive turbine disk blank sample is used under the same preparation process conditions, the prepared blank has the defects of large deformation, a large number of cracks and the like, and subsequent machining cannot be performed, so that the blank is difficult to be suitable for CMT additive.
Example 18:
the cobalt-based superalloy suitable for additive manufacturing comprises the following chemical components in percentage by mass: al:3.7%, fe:14.5%, mo:4.5%, cr:14.9%, ni:18.2%, ti:0.6%, ta:0.8%, W:3.5%, nb:0.8%, re:0.3%, C:0.03%, B:0.07 percent, less than or equal to 10ppm of O, less than or equal to 10ppm of N, less than or equal to 10ppm of P, less than or equal to 10ppm of S, less than or equal to 25ppm of O+N+S, and the balance of Co.
Cobalt alloy is made into cobalt alloy powder with the diameter of 15-53 mu m, a laser selective melting technology is used for preparing a cobalt alloy component, the laser power is set to be 100W, island scanning with the light spot diameter of 180 mu m is selected, the scanning speed is 380mm/s, the scanning interval is 120 mu m, and a turbine disk sample with the diameter of 0.5 mu m is obtained on a substrate in an additive mode.
The surface precision of the prepared sample is high, and the sample is free from deformation. The nondestructive testing analysis result of the X-ray shows that the additive sample has no defects such as cracks, air holes and the like.
When the traditional high-temperature alloy GH5188 powder additive turbine disk blank sample is used under the same preparation process conditions, the turbine disk prepared by laser selective melting has poor molding quality, a large number of cracks and other defects, and the use requirements are difficult to meet.
The components and test results of each example are shown in tables 1 to 5, respectively.
Table 1 specific examples composition table (wt.%)
Note that: o is less than or equal to 10ppm, N is less than or equal to 10ppm, S is less than or equal to 10ppm, P is less than or equal to 10ppm, O+N+S is less than or equal to 25ppm, and the balance is Co.
TABLE 2 room temperature tensile Property parameters
Note that: the transverse direction is parallel to the substrate direction, the longitudinal direction is perpendicular to the substrate direction, sigma b 、σ s And delta represents tensile strength, yield strength and elongation after break respectively.
Table 3 tensile Property parameters at 950℃
Note that: the transverse direction is parallel to the substrate direction, the longitudinal direction is perpendicular to the substrate direction, sigma b 、σ s And delta represents tensile strength, yield strength and elongation after break respectively.
Table 4 permanent Performance parameters of 950 ℃ C./70 MPa
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Note that: the transverse direction is parallel to the substrate direction, the longitudinal direction is perpendicular to the substrate direction, and τ represents the duration.
Table 5 950 ℃ C./100 h (. Epsilon.) p =1) creep performance parameter
Note that: the transverse direction is parallel to the substrate direction, the longitudinal direction is perpendicular to the substrate direction, and sigma represents the creep limit.
The present invention is not limited to the above embodiments. Any improvement of the invention, equivalent replacement of each element of the product, addition of auxiliary components, change of the preparation method and the like are all within the protection scope and the disclosure scope of the invention.

Claims (8)

1. The cobalt-based superalloy suitable for additive manufacturing is characterized in that a massive additive body is obtained by additive manufacturing through a cold metal transition welding technology after wire materials are manufactured, and the alloy comprises the following chemical components in percentage by mass: fe:14.0 to 15.5%, cr: 14.2-15.5%, ni: 17.0-19.0%, mo: 3.5-5.0%, ti: 0.5-1.0%, al:3.0 to 4.0%, ta: 0.5-1.0%, W: 2.3-4.0%, nb: 0.5-1.0%, re: 0.1-0.5%, C: 0.02-0.05%, B: 0.001-0.08%, O is less than or equal to 10ppm, N is less than or equal to 10ppm, P is less than or equal to 10ppm, S is less than or equal to 10ppm, O+N+S is less than or equal to 25ppm, and the balance is Co.
2. The cobalt-based superalloy suitable for additive manufacturing is characterized in that after being manufactured into powder, the cobalt-based superalloy is manufactured into a block-shaped additive body through a laser selective melting technology, and the alloy comprises the following chemical components in percentage by mass: fe:14.0 to 15.5%, cr: 14.2-15.5%, ni: 17.0-19.0%, mo: 3.5-5.0%, ti: 0.5-1.0%, al:3.0 to 4.0%, ta: 0.5-1.0%, W: 2.3-4.0%, nb: 0.5-1.0%, re: 0.1-0.5%, C: 0.02-0.05%, B: 0.001-0.08%, O is less than or equal to 10ppm, N is less than or equal to 10ppm, P is less than or equal to 10ppm, S is less than or equal to 10ppm, O+N+S is less than or equal to 25ppm, and the balance is Co.
3. The preparation method of the cobalt-based superalloy suitable for additive manufacturing is characterized by comprising the following steps of:
preparing a cobalt alloy block by using the wire of the cobalt-based superalloy according to claim 1 through a cold metal transition welding technology, setting the wire feeding speed to be 4.5-5.5 m/min, the cladding speed to be 45-50 cm/min, and the welding current to be 120-140A, and additionally manufacturing a block sample of the cobalt-based superalloy on a substrate, wherein each layer of welding bead of the block is perpendicular to the next layer of welding bead.
4. The preparation method of the cobalt-based superalloy suitable for additive manufacturing is characterized by comprising the following steps of:
Preparing a cobalt alloy block by using the wire of the cobalt-based superalloy according to claim 1 through a cold metal transition welding technology, setting the wire feeding speed to be 4.5m/min, the cladding speed to be 45cm/min, and the welding current to be 100A, and additionally manufacturing a block sample of the cobalt-based superalloy on a substrate, wherein each layer of welding bead of the block is perpendicular to the next layer of welding bead.
5. The method of claim 3 or 4, wherein the wire has a diameter of 0.8 to 1.2mm.
6. The preparation method of the cobalt-based superalloy suitable for additive manufacturing is characterized by comprising the following steps of:
preparing a cobalt alloy block by using the powder of the cobalt-based superalloy according to claim 2 through a laser selective melting technology, setting the laser power to be 100-120W, selecting an island with a light spot diameter of 180 μm for scanning, wherein the scanning speed is 350-400 mm/s, the scanning interval is 120-130 μm, and additionally manufacturing the block sample of the cobalt-based superalloy on a substrate.
7. The preparation method of the cobalt-based superalloy suitable for additive manufacturing is characterized by comprising the following steps of:
the cobalt-based superalloy powder of claim 2 was selectively melted by a laser to produce a cobalt alloy component, the laser power was set at 100W, island scans were selected with a spot diameter of 180 μm at a scan speed of 380mm/s and a scan pitch of 120 μm, and bulk samples of the cobalt-based superalloy were additively produced on a substrate.
8. The method according to claim 6 or 7, wherein the powder has a diameter of 15-53 μm.
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