CN115058626A - Cobalt-based high-temperature alloy suitable for additive manufacturing - Google Patents

Cobalt-based high-temperature alloy suitable for additive manufacturing Download PDF

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CN115058626A
CN115058626A CN202110249391.0A CN202110249391A CN115058626A CN 115058626 A CN115058626 A CN 115058626A CN 202110249391 A CN202110249391 A CN 202110249391A CN 115058626 A CN115058626 A CN 115058626A
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cobalt
substrate
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CN115058626B (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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  • Manufacturing & Machinery (AREA)
  • Materials For Medical Uses (AREA)
  • Turbine Rotor Nozzle Sealing (AREA)

Abstract

The invention discloses a cobalt-based high-temperature alloy suitable for additive manufacturing, which comprises the following chemical components in percentage by mass: fe: 14.0-15.5%, Cr: 14.2-15.5%, Ni: 17.0-19.0%, Mo: 3.5-5.0%, Ti: 0.5-1.0%, Al: 3.0-4.0%, Ta: 0.5-1.0%, W: 2.3-4.0%, Nb: 0.5 to 1.0%, Re: 0.1-0.5%, C: 0.02-0.05%, B: 0.001-0.08%, 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 high-temperature alloy has good manufacturability in the material increasing process, and the prepared complex-structure part has no defects of cracks, air holes and the like.

Description

Cobalt-based high-temperature alloy suitable for additive manufacturing
Technical Field
The invention discloses a cobalt-based high-temperature alloy suitable for additive manufacturing, and belongs to the technical field of metal materials.
Background
An Additive Manufacturing (AM) technology is a high and new technology that integrates contents of computers, materials, three-dimensional digital modeling and the like, and a Manufacturing technology for Manufacturing solid articles by stacking special metal materials, non-metal materials and medical biomaterials layer by layer in modes of extrusion, sintering, melting, photocuring, spraying and the like through software and a numerical control system. The method is a complex part near-forming technology, so that the method has the advantages of high material utilization rate, short manufacturing period, capability of manufacturing complex parts and the like, and has a certain application prospect in the field of aerospace.
The cobalt-based high-temperature alloy has higher strength, good thermal fatigue resistance, thermal corrosion resistance and wear resistance at high temperature, has higher thermal conductivity and lower thermal expansion performance compared with the nickel-based high-temperature alloy, and is widely used for manufacturing guide blades and nozzle guide vanes of gas turbines of aviation jet engines and industrial gas turbines and ships, diesel engine nozzles and the like. The additive manufacturing technology and the cobalt-based high-temperature alloy are organically combined, so that not only can parts with complex structures in an aircraft engine be manufactured more conveniently, but also the manufactured cobalt-based high-temperature alloy parts have good heat resistance, wear resistance and corrosion resistance, and have important practical value and strategic significance for manufacturing of parts with complex high-temperature structures and popularization and use of the cobalt-based high-temperature alloy.
At present, the cobalt-based high-temperature alloy suitable for additive manufacturing is extremely limited, the traditional cobalt-based high-temperature alloy has the defects of poor manufacturability, easy deformation, pore crack generation and the like in the additive manufacturing process, and also shows larger stress in a large component, and the traditional cobalt-based high-temperature alloy is difficult to be suitable for additive manufacturing.
Disclosure of Invention
In order to solve the problem that the forming property and the manufacturability of the cobalt-based high-temperature alloy in the additive manufacturing process are poor, the invention aims to provide the cobalt-based high-temperature alloy suitable for additive manufacturing and the preparation method thereof.
The technical solution for realizing the purpose of the invention is as follows:
a cobalt-based high-temperature alloy suitable for additive manufacturing comprises the following chemical components in percentage by mass: fe: 14.0-15.5%, Cr: 14.2-15.5%, Ni: 17.0-19.0%, Mo: 3.5-5.0%, Ti: 0.5-1.0%, Al: 3.0-4.0%, Ta: 0.5-1.0%, W: 2.3-4.0%, Nb: 0.5 to 1.0%, Re: 0.1-0.5%, C: 0.02-0.05%, B: 0.001-0.08%, 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 high-temperature alloy suitable for additive manufacturing specifically comprises the following steps:
preparing a cobalt alloy block from a 0.8-1.2 mm cobalt-based high-temperature alloy wire by using a cold metal transfer welding (CMT) 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 manufacturing a cobalt-based alloy block sample on a substrate in an additive mode, wherein each layer of welding pass of the block is perpendicular to the next layer of welding pass.
Preferably, a cobalt-based high-temperature alloy wire with the thickness of 0.8-1.2 mm is used for preparing a cobalt alloy block by using a cold metal transfer welding (CMT) technology, 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, the cobalt-based alloy block sample is manufactured on a substrate in an additive mode, and each welding pass of the block is perpendicular to the next welding pass.
The invention also provides another preparation method of the cobalt-based high-temperature alloy suitable for additive manufacturing, which specifically comprises the following steps:
preparing a cobalt alloy block from cobalt-based high-temperature alloy powder with the diameter of 15-53 mu m by using a Selective Laser Melting (SLM) technology, setting the laser power to be 100-120W, selecting an island with the spot diameter of 180 mu m for scanning, wherein the scanning speed is 350-400 mm/s, the scanning interval is 120-130 mu m, and performing additive manufacturing on a substrate to obtain the cobalt-based alloy block sample.
Preferably, cobalt alloy components are prepared by melting cobalt-based high-temperature alloy powder with the diameter of 15-53 mu m in a laser selective area mode, the laser power is set to be 100W, an island with the spot diameter of 180 mu m is selected for scanning, the scanning speed is 380mm/s, the scanning interval is 120 mu m, and a blank sample is formed on the substrate in a material increasing mode.
Compared with the prior art, the invention has the beneficial effects that:
the invention designs the cobalt-based high-temperature alloy suitable for additive manufacturing, the alloy system has good printing manufacturability, and the prepared sample has no defects of cracks, air holes and the like. The massive additive body obtained through additive manufacturing after being made into wire materials or powder is parallel to the direction of the substrate, the room-temperature tensile strength, the yield strength and the elongation after fracture are respectively 942-985 MPa, 432-490 MPa and 42-50%, the 950-DEG C tensile strength, the yield strength and the elongation after fracture are respectively 446-486 MPa, 205-265 MPa and 47-57%, the creep limit of the additive body, the maximum deformation of which does not exceed 1% 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 additive body is perpendicular to the direction of the substrate, the room-temperature tensile strength, the yield strength and the elongation after fracture are respectively 920-970 MPa, 412-480 MPa and 53-61%, the 950-DEG C tensile strength, the yield strength and the elongation after fracture are respectively 426-456 MPa, 197-242 MPa and 58-70%, the creep limit of the additive body, which has the maximum deformation of not more than 1% under the test condition of 950 ℃/100h, is 47-60 MPa, and the lasting time under the test condition of 950 ℃/70MPa is 300-345 h. In a word, a sample manufactured by the cobalt-based alloy additive has good 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 high-temperature alloy suitable for additive manufacturing, which contains alloy elements such as Cr, Fe, Ni, Mo, Al, Ti, Nb, Ta, W, Re, C, B and the like, and the prepared additive printing has good manufacturability and formability, excellent body performance, high strength, high plasticity and excellent high-temperature performance.
The cobalt-based high-temperature alloy suitable for additive manufacturing comprises the following chemical components in percentage by mass: fe: 14.0-15.5%, Cr: 14.2 to 15.5%, Ni: 17.0-19.0%, Mo: 3.5-5.0%, Ti: 0.5-1.0%, Al: 3.0-4.0%, Ta: 0.5-1.0%, W: 2.3-4.0%, Nb: 0.5 to 1.0%, Re: 0.1-0.5%, C: 0.02-0.05%, B: 0.001-0.08%, 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 Cr element improves the oxidation resistance and corrosion resistance of the alloy, the Ni element enables gamma austenite to exist stably, the Mo element, the W element and the Nb element play a role in solid solution strengthening, the Ti element and the Al element are added to form a dispersed gamma' -phase precipitation strengthening phase, the B element is added to strengthen a grain boundary, the C element, the Re element and the Fe element are added to optimize the alloy performance, the Ta element is added to enable the gamma phase to be still stable under a high-temperature condition, the Co element is an alloy matrix, and O, C, P, S is an impurity element. A large number of research experiments show that the alloy elements have mutual synergistic effect, and the prepared cobalt-based high-temperature alloy has good manufacturability and excellent mechanical property in the additive process within the range of the alloy elements.
The preparation method of the cobalt-based high-temperature alloy suitable for additive manufacturing specifically comprises the following steps:
(1) preparing materials required by the cobalt alloy according to the designed components;
(2) putting the prepared material into a vacuum smelting furnace for smelting, and casting into a solid bar;
(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 0.8-1.2 mm cobalt alloy wire by using a cold metal transfer welding (CMT) 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 performing additive manufacturing on a cobalt-based alloy block sample on a substrate, wherein each layer of welding bead of the block is vertical to the next layer of welding bead.
The invention also provides a preparation method of the cobalt-based high-temperature alloy suitable for additive manufacturing, which specifically comprises the following steps of:
(1) preparing materials required by the cobalt alloy according to the designed components;
(2) putting the prepared material into a vacuum smelting furnace for smelting, and casting into a solid bar;
(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 a cobalt alloy block from cobalt alloy powder with the diameter of 15-53 mu m by using a Selective Laser Melting (SLM) technology, setting the laser power to be 100-120W, selecting an island with the spot diameter of 180 mu m for scanning, wherein the scanning speed is 350-400 mm/s, the scanning interval is 120-130 mu m, and performing additive manufacturing on a substrate to obtain the cobalt alloy block sample.
Example 1:
a cobalt-based high-temperature alloy 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.
The cobalt-based high-temperature alloy is made into a wire with the diameter of 0.8mm, the wire is subjected to additive manufacturing by using CMT, the wire feeding speed is set to be 4.5m/s, the welding current is set to be 120A, the cladding speed is set to be 45cm/min, and a block sample with the size of 20 multiplied by 20cm is formed on a substrate in a surfacing mode. And each layer of welding bead is vertical to the next welding bead, and the prepared sample is cut into two types of samples in the direction parallel to the substrate and the direction vertical to the substrate, so that the performance of the sample can be conveniently analyzed.
And (3) preparing a microstructure of a metallographic specimen observation sample, wherein the structure of the additive body parallel to the substrate direction is isometric crystal, and the structure of the additive body vertical to the substrate direction is columnar crystal. The sample has no obvious defects such as air holes, cracks and the like, and has good manufacturability in the material increasing process.
According to the national standard of tensile test, the block body is made into tensile test samples meeting the national standard and is subjected to tensile property test, the room-temperature tensile strength, the yield strength and the elongation after fracture are respectively 942MPa, 432MPa and 47% in the direction parallel to the substrate, the 950 ℃ tensile strength, the yield strength and the elongation after fracture are respectively 456MPa, 218MPa and 51%, the lasting time under the test condition of 950 ℃/70MPa is 335h, and the creep limit under the test condition of 950 ℃/100h, in which the maximum deformation does not exceed 1%, is 56 MPa. The room-temperature tensile strength, the yield strength and the elongation after fracture of the additive body in the direction vertical to the substrate are 931MPa, 412MPa and 58 percent respectively, the 950-DEG C tensile strength, the yield strength and the elongation after fracture are 436MPa, 201MPa and 61 percent respectively, the lasting time under the test condition of 950 ℃/70MPa is 324h, and the creep limit under the test condition of 950 ℃/100h, in which the maximum deformation does not exceed 1 percent, is 53 MPa.
Example 2:
a cobalt-based high-temperature alloy 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, 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 high-temperature alloy is made into a wire with the diameter of 1mm, the wire is subjected to additive manufacturing by using CMT, the wire feeding speed is set to be 5.0m/s, the welding current is set to be 125A, the cladding speed is set to be 50cm/min, and a block sample with the size of 20 multiplied by 20cm is formed on a substrate in a surfacing mode. And each layer of welding bead is vertical to the next welding bead, and the prepared sample is cut into two types of samples in the direction parallel to the substrate and the direction vertical to the substrate, so that the performance of the sample can be conveniently analyzed.
And (3) preparing a microstructure of a metallographic specimen observation sample, wherein the structure of the additive body parallel to the substrate direction is isometric crystal, and the structure of the additive body vertical to the substrate direction is columnar crystal. The sample has no obvious defects such as air holes, cracks and the like, and has good manufacturability in the material increasing process.
According to the national standard of tensile test, the block body is made into tensile test samples meeting the national standard and is subjected to tensile property test, room-temperature tensile strength, yield strength and elongation after fracture are respectively 956MPa, 434MPa and 49% in the direction parallel to the substrate, 950 ℃ tensile strength, yield strength and elongation after fracture are respectively 460MPa, 220MPa and 52%, the lasting time under the test condition of 950 ℃/70MPa is 334h, and the creep limit under the test condition of 950 ℃/100h, in which the maximum deformation amount does not exceed 1%, is 57 MPa. The room-temperature tensile strength, the yield strength and the elongation after fracture of the additive body in the direction vertical to the substrate are respectively 920MPa, 435MPa and 59%, the 950- ℃ tensile strength, the yield strength and the elongation after fracture are respectively 440MPa, 206MPa and 64%, the lasting time under the test condition of 950 ℃/70MPa is 323h, and the creep limit under the test condition of 950 ℃/100h, in which the maximum deformation amount does not exceed 1%, is 52 MPa.
Example 3:
a cobalt-based high-temperature alloy 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, 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 high-temperature alloy is made into a wire with the diameter of 1mm, the wire is subjected to additive manufacturing by using CMT, the wire feeding speed is set to be 5.0m/s, the welding current is set to be 130A, the cladding speed is set to be 50cm/min, and a block sample with the size of 20 multiplied by 20cm is formed on a substrate in a surfacing mode. And each layer of welding bead is vertical to the next welding bead, and the prepared sample is cut into two types of samples in the direction parallel to the substrate and the direction vertical to the substrate, so that the performance of the sample can be conveniently analyzed.
And (3) preparing a microstructure of a metallographic specimen observation sample, wherein the structure of the additive body parallel to the substrate direction is isometric crystal, and the structure of the additive body vertical to the substrate direction is columnar crystal. The sample has no obvious defects such as air holes, cracks and the like, and has good manufacturability in the material increasing process.
According to the national standard of tensile test, the block body is made into a tensile test sample meeting the national standard and is subjected to tensile property test, the room-temperature tensile strength, the yield strength and the elongation after fracture are respectively 980MPa, 490MPa and 50% in the direction parallel to the substrate, the 950-DEG C tensile strength, the yield strength and the elongation after fracture are respectively 486MPa, 265MPa and 56%, the lasting time under the test condition of 950 ℃/70MPa is 355h, and the creep limit of which the maximum deformation does not exceed 1% under the test condition of 950 ℃/100h is 63 MPa. The room-temperature tensile strength, the yield strength and the elongation after fracture of the additive body in the direction vertical to the substrate are 970MPa, 480MPa and 61 percent respectively, the 950- ℃ tensile strength, the yield strength and the elongation after fracture are 456MPa, 242MPa and 70 percent respectively, the lasting time under the test condition of 950 ℃/70MPa is 345h, and the creep limit of which the maximum deformation does not exceed 1 percent under the test condition of 950 ℃/100h is 60 MPa.
Example 4:
a cobalt-based high-temperature alloy 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.
The cobalt-based high-temperature alloy is made into a wire with the diameter of 1.2mm, the wire is subjected to additive manufacturing by using CMT, the wire feeding speed is set to be 5.5m/s, the welding current is set to be 140A, the cladding speed is set to be 50cm/min, and a block sample with the size of 20 multiplied by 20cm is formed on a substrate in a surfacing mode. And each layer of welding bead is vertical to the next welding bead, and the prepared sample is cut into two types of samples in the direction parallel to the substrate and the direction vertical to the substrate, so that the performance of the sample can be conveniently analyzed.
And (3) preparing a microstructure of a metallographic specimen observation sample, wherein the structure of the additive body parallel to the substrate direction is isometric crystal, and the structure of the additive body vertical to the substrate direction is columnar crystal. The sample has no obvious defects such as air holes, cracks and the like, and has good manufacturability in the material increasing process.
According to the national standard of tensile test, the block body is made into tensile test samples meeting the national standard and is subjected to tensile property test, the room-temperature tensile strength, the yield strength and the elongation after fracture are respectively 975MPa, 452MPa and 46% in the direction parallel to the substrate, the 950-DEG C tensile strength, the yield strength and the elongation after fracture are respectively 471MPa, 236MPa and 52%, the lasting time under the test condition of 950 ℃/70MPa is 346h, and the creep limit under the test condition of 950 ℃/100h, in which the maximum deformation does not exceed 1%, is 59 MPa. The room-temperature tensile strength, the yield strength and the elongation after fracture of the additive body in the direction vertical to the substrate are 945MPa, 440MPa and 57 percent respectively, the 950- ℃ tensile strength, the yield strength and the elongation after fracture are 451MPa, 216MPa and 63 percent respectively, the lasting time under the test condition of 950 ℃/70MPa is 335h, and the creep limit under the test condition of 950 ℃/100h, in which the maximum deformation amount does not exceed 1 percent, is 56 MPa.
Example 5:
a cobalt-based high-temperature alloy 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, 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 high-temperature alloy is made into a wire with the diameter of 0.8mm, the wire is subjected to additive manufacturing by using CMT, the wire feeding speed is set to be 4.5m/s, the welding current is set to be 120A, the cladding speed is set to be 45cm/min, and a block sample with the size of 20 multiplied by 20cm is formed on a substrate in a surfacing mode. And each layer of welding bead is vertical to the next welding bead, and the prepared sample is cut into two types of samples in the direction parallel to the substrate and the direction vertical to the substrate, so that the performance of the sample can be conveniently analyzed.
And (3) preparing a microstructure of a metallographic specimen observation sample, wherein the structure of the additive body parallel to the substrate direction is isometric crystal, and the structure of the additive body vertical to the substrate direction is columnar crystal. The sample has no obvious defects such as air holes, cracks and the like, and has good manufacturability in the material increasing process.
According to the national standard of tensile test, the block is made into tensile test samples meeting the national standard and is subjected to tensile property test, the room-temperature tensile strength, the yield strength and the elongation after fracture are obtained in the direction parallel to the substrate and are 970MPa, 475MPa and 45 percent respectively, the 950-DEG C tensile strength, the yield strength and the elongation after fracture are 470MPa, 233MPa and 51 percent respectively, the lasting time under the test condition of 950 ℃/70MPa is 343h, and the creep limit under the test condition of 950 ℃/100h, in which the maximum deformation does not exceed 1 percent, is 57 MPa. The room-temperature tensile strength, the yield strength and the elongation after fracture of the additive body in the direction vertical to the substrate are 944MPa, 445MPa and 56% respectively, the 950-DEG C tensile strength, the yield strength and the elongation after fracture are 450MPa, 213MPa and 65% respectively, the lasting time under the test condition of 950 ℃/70MPa is 333h, and the creep limit under the test condition of 950 ℃/100h, in which the maximum deformation does not exceed 1%, is 55 MPa.
Example 6:
a cobalt-based high-temperature alloy 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 high-temperature alloy is made into a wire with the diameter of 1mm, the wire is subjected to additive manufacturing by using CMT, the wire feeding speed is set to be 5.0m/s, the welding current is set to be 125A, the cladding speed is set to be 50cm/min, and a block sample with the size of 20 multiplied by 20cm is formed on a substrate in a surfacing mode. And each layer of welding bead is vertical to the next welding bead, and the prepared sample is cut into two types of samples in the direction parallel to the substrate and the direction vertical to the substrate, so that the performance of the sample can be conveniently analyzed.
And (3) preparing a microstructure of a metallographic specimen observation sample, wherein the structure of the additive body parallel to the substrate direction is isometric crystal, and the structure of the additive body vertical to the substrate direction is columnar crystal. The sample has no obvious defects such as air holes, cracks and the like, and has good manufacturability in the material increasing process.
According to the national standard of tensile test, the block is made into tensile test samples meeting the national standard and is subjected to tensile property test, room-temperature tensile strength, yield strength and elongation after fracture are respectively 965MPa, 449MPa and 46% in the direction parallel to the substrate, the tensile strength at 950 ℃, yield strength and elongation after fracture are respectively 468MPa, 229MPa and 50%, the lasting time under the test condition of 950 ℃/70MPa is 340h, and the creep limit under the test condition of 950 ℃/100h, in which the maximum deformation does not exceed 1%, is 58 MPa. The tensile strength at room temperature, the yield strength and the elongation after fracture of the additive body in the direction vertical to the substrate are 936MPa, 443MPa and 58 percent respectively, the tensile strength at 950 ℃, the yield strength and the elongation after fracture are 448MPa, 219MPa and 63 percent respectively, the lasting time under the test condition of 950 ℃/70MPa is 320h, and the creep limit under the test condition of 950 ℃/100h, in which the maximum deformation does not exceed 1 percent, is 56 MPa.
Example 7:
a cobalt-based high-temperature alloy 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, 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 high-temperature alloy is made into a wire with the diameter of 1mm, the wire is subjected to additive manufacturing by using CMT, the wire feeding speed is set to be 5.0m/s, the welding current is set to be 130A, the cladding speed is set to be 50cm/min, and a block sample with the size of 20 multiplied by 20cm is formed on a substrate in a surfacing mode. And each layer of welding bead is vertical to the next welding bead, and the prepared sample is cut into two types of samples in the direction parallel to the substrate and the direction vertical to the substrate, so that the performance of the sample can be conveniently analyzed.
And (3) preparing a microstructure of a metallographic specimen observation sample, wherein the structure of the additive body parallel to the substrate direction is isometric crystal, and the structure of the additive body vertical to the substrate direction is columnar crystal. The sample has no obvious defects such as air holes, cracks and the like, and has good manufacturability in the material increasing process.
According to the national standard of tensile test, the block is made into tensile test samples meeting the national standard and is subjected to tensile property test, the room-temperature tensile strength, the yield strength and the elongation after fracture are respectively 978MPa, 456MPa and 47% in the direction parallel to the substrate, the 950-DEG C tensile strength, the yield strength and the elongation after fracture are respectively 463MPa, 220MPa and 50%, the lasting time under the test condition of 950 ℃/70MPa is 334h, and the creep limit under the test condition of 950 ℃/100h, in which the maximum deformation does not exceed 1%, is 56 MPa. The tensile strength at room temperature, the yield strength and the elongation after fracture of the additive body in the direction vertical to the substrate are 948MPa, 426MPa and 60 percent respectively, the tensile strength at 950 ℃, the yield strength and the elongation after fracture are 440MPa, 209MPa and 59 percent respectively, the lasting time under the test condition of 950 ℃/70MPa is 324h, and the creep limit under the test condition of 950 ℃/100h, wherein the maximum deformation amount of the additive body does not exceed 1 percent, is 53 MPa.
Example 8:
a cobalt-based high-temperature alloy 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, 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 high-temperature alloy is made into a wire with the diameter of 1.2mm, the wire is subjected to additive manufacturing by using CMT, the wire feeding speed is set to be 5.5m/s, the welding current is set to be 140A, the cladding speed is set to be 50cm/min, and a block sample with the size of 20 multiplied by 20cm is formed on a substrate in a surfacing mode. And each layer of welding bead is vertical to the next welding bead, and the prepared sample is cut into two types of samples in the direction parallel to the substrate and the direction vertical to the substrate, so that the performance of the sample can be conveniently analyzed.
And (3) preparing a microstructure of a metallographic specimen observation sample, wherein the structure of the additive body parallel to the substrate direction is isometric crystal, and the structure of the additive body vertical to the substrate direction is columnar crystal. The sample has no obvious defects such as air holes, cracks and the like, and has good manufacturability in the material increasing process.
According to the national standard of tensile test, the block is made into tensile test samples meeting the national standard and is subjected to tensile property test, the room-temperature tensile strength, the yield strength and the elongation after fracture are obtained in the direction parallel to the substrate and are 970MPa, 449MPa and 46 percent respectively, the 950-DEG C tensile strength, the yield strength and the elongation after fracture are 457MPa, 217MPa and 49 percent respectively, the lasting time under the test condition of 950 ℃/70MPa is 330h, and the creep limit under the test condition of 950 ℃/100h, in which the maximum deformation does not exceed 1 percent, is 53 MPa. The room-temperature tensile strength, the yield strength and the elongation after fracture of the matrix in the direction vertical to the substrate are 938MPa, 428MPa and 57 percent respectively, the 950-DEG C tensile strength, the yield strength and the elongation after fracture are 426MPa, 205MPa and 60 percent respectively, the endurance time under the test condition of 950 ℃/70MPa is 320h, and the creep limit under the test condition of 950 ℃/100h, in which the maximum deformation does not exceed 1 percent, is 50 MPa.
Example 9:
a cobalt-based high-temperature alloy 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 the cobalt-based high-temperature alloy into 15-53 mu m cobalt-based high-temperature alloy powder, preparing a cobalt-based high-temperature alloy block by using a selective laser melting technology, setting the laser power to be 100W, selecting an island with the spot diameter of 180 mu m for scanning, wherein the scanning speed is 350mm/s, the scanning interval is 120 mu m, and performing additive machining on a substrate to obtain a block sample with the size of 20 multiplied by 20 cm. The prepared sample is cut into two types of samples in the directions parallel to the substrate and perpendicular to the substrate, so that the performance of the sample can be conveniently analyzed.
And (3) preparing a microstructure of a metallographic specimen observation sample, wherein the structure of the additive body parallel to the substrate direction is isometric crystal, and the structure of the additive body vertical to the substrate direction is columnar crystal. The sample has no obvious defects such as air holes, cracks and the like, and has good manufacturability in the material increasing process.
According to the national standard of tensile test, the block body is made into tensile test samples meeting the national standard and is subjected to tensile property test, the room-temperature tensile strength, the yield strength and the elongation after fracture are respectively 960MPa, 445MPa and 45% in the direction parallel to the substrate, the 950-DEG C tensile strength, the yield strength and the elongation after fracture are respectively 450MPa, 210MPa and 48%, the lasting time under the test condition of 950 ℃/70MPa is 328h, and the creep limit under the test condition of 950 ℃/100h, wherein the maximum deformation amount of the block body does not exceed 1%, is 50 MPa. The room-temperature tensile strength, the yield strength and the elongation after fracture of the additive body in the direction vertical to the substrate are 930MPa, 423MPa and 55 percent respectively, the 950-DEG C tensile strength, the yield strength and the elongation after fracture are 430MPa, 220MPa and 59 percent respectively, the lasting time under the test condition of 950 ℃/70MPa is 318h, and the creep limit under the test condition of 950 ℃/100h, in which the maximum deformation does not exceed 1 percent, is 47 MPa.
Example 10:
a cobalt-based high-temperature alloy 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, 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 method comprises the steps of preparing a cobalt-based high-temperature alloy into 15-53 mu m cobalt-based high-temperature alloy powder, preparing a cobalt-based high-temperature alloy block by using a selective laser melting technology, setting laser power to be 110W, selecting an island with a spot diameter of 180 mu m for scanning, wherein the scanning speed is 400mm/s, the scanning interval is 130 mu m, and adding materials on a substrate to obtain a block sample with the size of 20 multiplied by 20 cm. The prepared sample is cut into two types of samples in the directions parallel to the substrate and perpendicular to the substrate, so that the performance of the sample can be conveniently analyzed.
And (3) preparing a microstructure of a metallographic specimen observation sample, wherein the structure of the additive body parallel to the substrate direction is isometric crystal, and the structure of the additive body vertical to the substrate direction is columnar crystal. The sample has no obvious defects such as air holes, cracks and the like, and has good manufacturability in the material increasing process.
According to the national standard of tensile test, the block body is made into tensile test samples meeting the national standard and is subjected to tensile property test, the room-temperature tensile strength, the yield strength and the elongation after fracture are respectively 972MPa, 447MPa and 46% in the direction parallel to the substrate, the 950-DEG C tensile strength, the yield strength and the elongation after fracture are respectively 469MPa, 226MPa and 52%, the lasting time under the test condition of 950 ℃/70MPa is 336h, and the creep limit under the test condition of 950 ℃/100h, in which the maximum deformation does not exceed 1%, is 56 MPa. The tensile strength at room temperature, the yield strength and the elongation after fracture of the additive body in the direction vertical to the substrate are 933MPa, 422MPa and 56 percent respectively, the tensile strength at 950 ℃, the yield strength and the elongation after fracture are 449MPa, 209MPa and 63 percent respectively, the lasting time under the test condition of 950 ℃/70MPa is 326h, and the creep limit under the test condition of 950 ℃/100h, in which the maximum deformation does not exceed 1 percent, is 53 MPa.
Example 11:
a cobalt-based high-temperature alloy 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.
The method comprises the steps of preparing 15-53 mu m cobalt-based high-temperature alloy powder from the cobalt-based high-temperature alloy, preparing a cobalt-based high-temperature alloy block by using a selective laser melting technology, setting laser power to be 105W, selecting an island with a spot diameter of 180 mu m for scanning, wherein the scanning speed is 380mm/s, the scanning interval is 125 mu m, and conducting material increase on a substrate to obtain a block sample with the size of 20 multiplied by 20 cm. The prepared sample is cut into two types of samples in the directions parallel to the substrate and perpendicular to the substrate, so that the performance of the sample can be conveniently analyzed.
And (3) preparing a microstructure of a metallographic specimen observation sample, wherein the structure of the additive body parallel to the substrate direction is isometric crystal, and the structure of the additive body vertical to the substrate direction is columnar crystal. The sample has no obvious defects such as air holes, cracks and the like, and has good manufacturability in the material increasing process.
According to the national standard of tensile test, the block body is made into a tensile test sample meeting the national standard and is subjected to tensile property test, room-temperature tensile strength, yield strength and elongation after fracture are respectively 983MPa, 485MPa and 48% in the direction parallel to the substrate, the tensile strength at 950 ℃, yield strength and elongation after fracture are respectively 465MPa, 233MPa and 53%, the lasting time under the test condition of 950 ℃/70MPa is 330h, and the creep limit under the test condition of 950 ℃/100h, in which the maximum deformation amount does not exceed 1%, is 53 MPa. The room-temperature tensile strength, the yield strength and the elongation after fracture of the additive body in the direction vertical to the substrate are 937MPa, 430MPa and 58% respectively, the 950-DEG C tensile strength, the yield strength and the elongation after fracture are 443MPa, 203MPa and 63% respectively, the lasting time under the test condition of 950 ℃/70MPa is 310h, and the creep limit under the test condition of 950 ℃/100h, in which the maximum deformation does not exceed 1%, is 50 MPa.
Example 12:
a cobalt-based high-temperature alloy 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.
The method comprises the steps of preparing 15-53 mu m cobalt-based high-temperature alloy powder from the cobalt-based high-temperature alloy, preparing a cobalt-based high-temperature alloy block by using a selective laser melting technology, setting laser power to be 100W, selecting an island with a spot diameter of 180 mu m for scanning, wherein the scanning speed is 370mm/s, the scanning interval is 120 mu m, and adding materials on a substrate to obtain a block sample with the size of 20 multiplied by 20 cm. The prepared sample is cut into two types of samples in the directions parallel to the substrate and perpendicular to the substrate, so that the performance of the sample can be conveniently analyzed.
And (3) preparing a microstructure of a metallographic specimen observation sample, wherein the structure of the additive body parallel to the substrate direction is isometric crystal, and the structure of the additive body vertical to the substrate direction is columnar crystal. The sample has no obvious defects such as air holes, cracks and the like, and has good manufacturability in the material increasing process.
According to the national standard of tensile test, the block body is made into tensile test samples meeting the national standard and is subjected to tensile property test, the room-temperature tensile strength, the yield strength and the elongation after fracture are respectively 951MPa, 433MPa and 42% in the direction parallel to the substrate, the 950-DEG C tensile strength, the yield strength and the elongation after fracture are respectively 446MPa, 205MPa and 47%, the lasting time under the test condition of 950 ℃/70MPa is 321h, and the creep limit under the test condition of 950 ℃/100h, in which the maximum deformation does not exceed 1%, is 50 MPa. The room-temperature tensile strength, the yield strength and the elongation after fracture of the additive body in the direction perpendicular to the substrate are 921MPa, 416MPa and 53 percent respectively, the 950-DEG C tensile strength, the yield strength and the elongation after fracture are 433MPa, 197MPa and 58 percent respectively, the lasting time under the test condition of 950 ℃/70MPa is 300h, and the creep limit under the test condition of 950 ℃/100h, in which the maximum deformation does not exceed 1 percent, is 47 MPa.
Example 13:
a cobalt-based high-temperature alloy 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 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 method comprises the steps of preparing 15-53 mu m cobalt-based high-temperature alloy powder from the cobalt-based high-temperature alloy, preparing a cobalt-based high-temperature alloy block by using a selective laser melting technology, setting laser power to be 115W, selecting an island with a spot diameter of 180 mu m for scanning, wherein the scanning speed is 370mm/s, the scanning interval is 120 mu m, and adding materials on a substrate to obtain a block sample with the size of 20 multiplied by 20 cm. The prepared sample is cut into two types of samples in the directions parallel to the substrate and perpendicular to the substrate, so that the performance of the sample can be conveniently analyzed.
And (3) preparing a microstructure of a metallographic specimen observation sample, wherein the structure of the additive body parallel to the substrate direction is isometric crystal, and the structure of the additive body vertical to the substrate direction is columnar crystal. The sample has no obvious defects such as air holes, cracks and the like, and has good manufacturability in the material increasing process.
According to the national standard of tensile test, the block body is made into a tensile test sample meeting the national standard and is subjected to tensile property test, the room-temperature tensile strength, the yield strength and the elongation after fracture are respectively 976MPa, 450MPa and 46% in the direction parallel to the substrate, the 950-DEG C tensile strength, the yield strength and the elongation after fracture are respectively 460MPa, 230MPa and 52%, the lasting time under the test condition of 950 ℃/70MPa is 340h, and the creep limit of which the maximum deformation does not exceed 1% under the test condition of 950 ℃/100h is 57 MPa. The room-temperature tensile strength, the yield strength and the elongation after fracture of the additive body in the direction vertical to the substrate are 926MPa, 420MPa and 54 percent respectively, the 950-DEG C tensile strength, the yield strength and the elongation after fracture are 430MPa, 203MPa and 62 percent respectively, the endurance time under the test condition of 950 ℃/70MPa is 320h, and the creep limit of which the maximum deformation does not exceed 1 percent under the test condition of 950 ℃/100h is 52 MPa.
Example 14:
a cobalt-based high-temperature alloy 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.
The method comprises the steps of preparing a cobalt-based high-temperature alloy into 15-53 mu m cobalt-based high-temperature alloy powder, preparing a cobalt-based high-temperature alloy block by using a selective laser melting technology, setting laser power to be 120W, selecting an island with a spot diameter of 180 mu m for scanning, wherein the scanning speed is 370mm/s, the scanning interval is 120 mu m, and conducting material increase on a substrate to obtain a block sample with the size of 20 multiplied by 20 cm. The prepared sample is cut into two types of samples in the directions parallel to the substrate and perpendicular to the substrate, so that the performance of the sample can be conveniently analyzed.
And (3) preparing a microstructure of a metallographic specimen observation sample, wherein the structure of the additive body parallel to the substrate direction is isometric crystal, and the structure of the additive body vertical to the substrate direction is columnar crystal. The sample has no obvious defects such as air holes, cracks and the like, and has good manufacturability in the material increasing process.
According to the national standard of tensile test, the block body is made into a tensile test sample meeting the national standard and is subjected to tensile property test, room-temperature tensile strength, yield strength and elongation after fracture are respectively 985MPa, 480MPa and 50% in the direction parallel to the substrate, the tensile strength at 950 ℃, yield strength and elongation after fracture are respectively 485MPa, 264MPa and 57%, the lasting time under the test condition of 950 ℃/70MPa is 350h, and the creep limit under the test condition of 950 ℃/100h, wherein the maximum deformation amount of the creep limit is not more than 1%, is 63 MPa. The tensile strength, yield strength and elongation after fracture of the additive body at room temperature in the direction vertical to the substrate are 935MPa, 426MPa and 60 percent respectively, the tensile strength, yield strength and elongation after fracture at 950 ℃ are 451MPa, 234MPa and 68 percent respectively, the lasting time under the test condition of 950 ℃/70MPa is 330h, and the creep limit under the test condition of 950 ℃/100h, in which the maximum deformation does not exceed 1 percent, is 59 MPa.
Example 15:
a cobalt-based high-temperature alloy 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.
The method comprises the steps of preparing 15-53 mu m cobalt-based high-temperature alloy powder from the cobalt-based high-temperature alloy, preparing a cobalt-based high-temperature alloy block by using a selective laser melting technology, setting laser power to be 115W, selecting an island with a spot diameter of 180 mu m for scanning, wherein the scanning speed is 380mm/s, the scanning interval is 120 mu m, and conducting material increase on a substrate to obtain a block sample with the size of 20 multiplied by 20 cm. The prepared sample is cut into two types of samples in the directions parallel to the substrate and perpendicular to the substrate, so that the performance of the sample can be conveniently analyzed.
And (3) preparing a microstructure of a metallographic specimen observation sample, wherein the structure of the additive body parallel to the substrate direction is isometric crystal, and the structure of the additive body vertical to the substrate direction is columnar crystal. The sample has no obvious defects such as air holes, cracks and the like, and has good manufacturability in the material increasing process.
According to the national standard of tensile test, the block body is made into tensile test samples meeting the national standard and is subjected to tensile property test, room-temperature tensile strength, yield strength and elongation after fracture are respectively 981MPa, 476MPa and 49 percent in the direction parallel to the substrate, the 950-DEG C tensile strength, yield strength and elongation after fracture are respectively 479MPa, 241MPa and 54 percent, the lasting time under the test condition of 950 ℃/70MPa is 346h, and the creep limit under the test condition of 950 ℃/100h, in which the maximum deformation does not exceed 1 percent, is 58 MPa. The room-temperature tensile strength, the yield strength and the elongation after fracture of the additive body in the direction vertical to the substrate are 930MPa, 433MPa and 59 percent respectively, the 950-DEG C tensile strength, the yield strength and the elongation after fracture are 439MPa, 213MPa and 64 percent respectively, the lasting time under the test condition of 950 ℃/70MPa is 326h, and the creep limit of which the maximum deformation does not exceed 1 percent under the test condition of 950 ℃/100h is 55 MPa.
Example 16:
a cobalt-based high-temperature alloy 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, 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 the cobalt-based high-temperature alloy into 15-53 mu m cobalt-based high-temperature alloy powder, preparing a cobalt-based high-temperature alloy block by using a selective laser melting technology, setting the laser power to be 120W, selecting an island with the spot diameter of 180 mu m for scanning, wherein the scanning speed is 400mm/s, the scanning interval is 120 mu m, and performing additive machining on a substrate to obtain a block sample with the size of 20 multiplied by 20 cm. The prepared sample is cut into two types of samples in the directions parallel to the substrate and perpendicular to the substrate, so that the performance of the sample can be conveniently analyzed.
And (3) preparing a microstructure of a metallographic specimen observation sample, wherein the structure of the additive body parallel to the substrate direction is isometric crystal, and the structure of the additive body vertical to the substrate direction is columnar crystal. The sample has no obvious defects such as air holes, cracks and the like, and has good manufacturability in the material increasing process.
According to the national standard of tensile test, the block body is made into a tensile test sample meeting the national standard and is subjected to tensile property test, the room-temperature tensile strength, the yield strength and the elongation after fracture are respectively 973MPa, 450MPa and 46% in the direction parallel to the substrate, the 950-DEG C tensile strength, the yield strength and the elongation after fracture are respectively 463MPa, 230MPa and 53%, the lasting time under the test condition of 950 ℃/70MPa is 338h, and the creep limit of which the maximum deformation does not exceed 1% under the test condition of 950 ℃/100h is 56 MPa. The room-temperature tensile strength, the yield strength and the elongation after fracture of the additive body in the direction perpendicular to the substrate are 924MPa, 419MPa and 55 percent respectively, the 950- ℃ tensile strength, the yield strength and the elongation after fracture are 433MPa, 200MPa and 62 percent respectively, the lasting time under the test condition of 950 ℃/70MPa is 318h, and the creep limit of which the maximum deformation does not exceed 1 percent under the test condition of 950 ℃/100h is 51 MPa.
Example 17:
a cobalt-based high-temperature alloy 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.
Manufacturing a cobalt-based alloy into a wire with the diameter of 0.8mm, performing additive manufacturing on the wire by using CMT (China Mobile technology), setting the wire feeding speed to be 4.5m/s, the welding current to be 120A and the cladding speed to be 45cm/min, overlaying a turbine disk blank sample with the diameter of 0.5m on a substrate, and manufacturing a turbine disk finished product by machining.
The blank of the material-added turbine disk has no deformation and cracking. The nondestructive testing analysis result of the X-ray of the machined turbine disc finished product shows that the additive sample has no defects such as cracks and air holes.
When the traditional high-temperature alloy wire GH5188 is used for material increase of turbine disk blank samples under the same preparation process conditions, the prepared blanks have the defects of large deformation, a large amount of cracks and the like, and subsequent machining cannot be performed, so that the method is difficult to apply to CMT material increase.
Example 18:
a cobalt-based high-temperature alloy 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.
Preparing cobalt alloy into 15-53 mu m cobalt alloy powder, preparing a cobalt alloy component by using a selective laser melting technology, setting the laser power to be 100W, selecting an island with the spot diameter of 180 mu m for scanning, wherein the scanning speed is 380mm/s, the scanning interval is 120 mu m, and adding a turbine disk sample with the diameter of 0.5m on a substrate.
The prepared sample has high surface precision and no deformation. The nondestructive testing analysis result of X-ray shows that the additive sample has no defects such as cracks, air holes and the like.
Under the same preparation process conditions, when a traditional high-temperature alloy GH5188 powder additive turbine disk blank sample is used, the turbine disk prepared by selective laser melting has the defects of poor molding quality, a large amount of cracks and the like, and the use requirements are difficult to meet.
The ingredients and test results for each example are given in tables 1 to 5, respectively.
Table 1 specific examples ingredient table (wt.%)
Figure BDA0002965359660000141
Figure BDA0002965359660000151
Note: 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 tensile Properties parameters at Room temperature
Figure BDA0002965359660000152
Figure BDA0002965359660000161
Note: the transverse direction is parallel to the substrate direction, and the longitudinal direction is perpendicular to the substrate direction, σ b 、σ s And δ represent tensile strength, yield strength, and elongation after fracture, respectively.
TABLE 3950 ℃ tensile Property parameters
Figure BDA0002965359660000162
Note: the transverse direction is parallel to the substrate direction, and the longitudinal direction is perpendicular to the substrate direction, σ b 、σ s And δ represent tensile strength, yield strength, and elongation after fracture, respectively.
TABLE 4950 ℃/70MPa PERSISTENT PERFORMANCE PARAMETERS
Figure BDA0002965359660000163
Figure BDA0002965359660000171
Note: the transverse direction is a direction parallel to the substrate, the longitudinal direction is a direction perpendicular to the substrate, and τ represents the duration.
TABLE 5950 deg.C/100 h (. epsilon.) p 1) creep performance parameters
Figure BDA0002965359660000172
Note: the transverse direction is the direction parallel to the substrate, the longitudinal direction is the direction perpendicular to the substrate, and σ represents the creep limit.
The present invention is not limited to the above-described embodiments. Any modification of the invention, equivalent substitution of each element of the product of the invention, addition of auxiliary components, change of the preparation method and the like are within the protection scope and the disclosure scope of the invention.

Claims (7)

1. A cobalt-based high-temperature alloy suitable for additive manufacturing is characterized by comprising the following chemical components in percentage by mass: fe: 14.0-15.5%, Cr: 14.2-15.5%, Ni: 17.0-19.0%, Mo: 3.5-5.0%, Ti: 0.5-1.0%, Al: 3.0-4.0%, Ta: 0.5-1.0%, W: 2.3-4.0%, Nb: 0.5 to 1.0%, Re: 0.1-0.5%, C: 0.02-0.05%, B: 0.001-0.08%, 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.
2. The preparation method of the cobalt-based high-temperature alloy suitable for additive manufacturing is characterized by comprising the following steps of:
preparing a cobalt alloy block by using a cold metal transition welding technology for the wire of the cobalt-based high-temperature alloy according to claim 1, setting a wire feeding speed to be 4.5-5.5 m/min, a cladding speed to be 45-50 cm/min and a welding current to be 120-140A, and performing additive manufacturing on a substrate to obtain a block sample of the cobalt-based high-temperature alloy, wherein each welding pass of the block is perpendicular to the next welding pass.
3. The preparation method of the cobalt-based high-temperature alloy suitable for additive manufacturing is characterized by comprising the following steps of:
the cobalt-based high-temperature alloy wire material of claim 1 is used for preparing a cobalt alloy block by using a cold metal transition welding technology, 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, and a block sample of the cobalt-based high-temperature alloy is subjected to additive manufacturing on a substrate, wherein each welding pass of the block is perpendicular to the next welding pass.
4. The method of claim 2 or 3, wherein the wire has a diameter of 0.8 to 1.2 mm.
5. The preparation method of the cobalt-based high-temperature alloy suitable for additive manufacturing is characterized by comprising the following steps of:
preparing a cobalt alloy block from the powder of the cobalt-based high-temperature alloy as defined in claim 1 by using a selective laser melting technology, setting laser power to be 100-120W, selecting an island with a spot diameter of 180 μm for scanning, wherein the scanning speed is 350-400 mm/s, the scanning interval is 120-130 μm, and performing additive manufacturing on a substrate to obtain a cobalt alloy block sample.
6. The preparation method of the cobalt-based high-temperature alloy suitable for additive manufacturing is characterized by comprising the following steps of:
the cobalt alloy member is prepared by melting the powder of the cobalt-based superalloy of claim 1 by selective laser melting, the laser power is set to 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 the cobalt-based superalloy bulk sample is manufactured on a substrate in an additive mode.
7. The method of claim 5 or 6, wherein the powder has a diameter of 15 to 53 μm.
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