CN114871452B - 3D printing method for bimetal material - Google Patents

3D printing method for bimetal material Download PDF

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Publication number
CN114871452B
CN114871452B CN202210485114.4A CN202210485114A CN114871452B CN 114871452 B CN114871452 B CN 114871452B CN 202210485114 A CN202210485114 A CN 202210485114A CN 114871452 B CN114871452 B CN 114871452B
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printing
ni22cr3
powder
laser
bimetal
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CN114871452A (en
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朱景川
毛成立
陈自谦
乐浩
周飞
张亮
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Harbin Institute of Technology
Shanghai Xinli Power Equipment Research Institute
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Harbin Institute of Technology
Shanghai Xinli Power Equipment Research Institute
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/20—Direct sintering or melting
    • B22F10/28—Powder bed fusion, e.g. selective laser melting [SLM] or electron beam melting [EBM]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/30—Process control
    • B22F10/36—Process control of energy beam parameters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F10/00—Additive manufacturing of workpieces or articles from metallic powder
    • B22F10/30—Process control
    • B22F10/36—Process control of energy beam parameters
    • B22F10/366—Scanning parameters, e.g. hatch distance or scanning strategy
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/14—Making metallic powder or suspensions thereof using physical processes using electric discharge
    • 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
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/08—Ferrous alloys, e.g. steel alloys containing nickel
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/18—Ferrous alloys, e.g. steel alloys containing chromium
    • C22C38/40—Ferrous alloys, e.g. steel alloys containing chromium with nickel
    • C22C38/56—Ferrous alloys, e.g. steel alloys containing chromium with nickel with more than 1.7% by weight of carbon
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
    • B22F9/00—Making metallic powder or suspensions thereof
    • B22F9/02—Making metallic powder or suspensions thereof using physical processes
    • B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
    • B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
    • B22F9/082—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying atomising using a fluid
    • B22F2009/0848—Melting process before atomisation
    • 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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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Automation & Control Theory (AREA)
  • Physics & Mathematics (AREA)
  • Plasma & Fusion (AREA)
  • Powder Metallurgy (AREA)

Abstract

The invention discloses a 3D printing method of a bimetal material, and belongs to the technical field of additive manufacturing-laser selective melting manufacturing. The invention provides a 3D printing process method capable of obtaining a bimetal material with good interface combination. By selecting different laser powers, scanning rates, track intervals and laser energy densities, the influence of different process parameters on the printing quality of the alloy and the quality of interface bonding between the alloys is explored, so that a 3D printing process for bimetal materials with complex shapes and small sizes is obtained. Meanwhile, the bimetal material prepared by the process has high density, good metallographic structure quality, good mechanical property and good interface combination, and can be used for preparing the microstructure of the mechanical metamaterial.

Description

3D printing method for bimetal material
Technical Field
The invention relates to a 3D printing method of a bimetal material, and belongs to the technical field of additive manufacturing-laser selective melting manufacturing.
Background
3D printing is a technique of manufacturing a three-dimensional product by adding materials layer by a 3D printing apparatus according to a designed 3D model. The layer-by-layer stacking forming technology is also called additive manufacturing, and 3D printing integrates the front edge technology in the fields of digital modeling technology, electromechanical control technology, information technology, material science, chemistry and the like, and is one of the rapid forming technologies.
Compared with the traditional manufacturing technology, the 3D printing does not need to manufacture a die in advance, does not need to remove a large amount of materials in the manufacturing process, and can obtain a final product without a complex forging process, so that the structure optimization, the material saving and the energy saving can be realized in production. The 3D printing technology is suitable for new product development, rapid single-piece and small-batch part manufacturing, manufacturing of parts with complex shapes, design and manufacturing of dies and the like.
The high thermal expansion alloy and the low thermal expansion alloy can be simultaneously used for preparing microstructures and composite materials of mechanical metamaterial, the microstructures are complex in shape and fine in structure, the bonding strength of corresponding welding seams is insufficient due to the change of different materials, and when the temperature is changed, different materials can also undergo different expansion deformation, and at the moment, further requirements are put on the bonding strength of the welding points. Therefore, it is necessary to provide a 3D printing process method capable of obtaining a bimetal material with good interface bonding.
Disclosure of Invention
The invention provides a 3D printing method of a bimetal material for solving the problems existing in the prior art.
The technical scheme of the invention is as follows:
a method of 3D printing of a bi-metallic material, the method comprising the steps of:
printing and forming high-thermal expansion alloy metal powder by adopting a laser selective melting technology to obtain a high-thermal expansion alloy forming sample;
and secondly, printing and forming low-thermal expansion alloy metal powder on the high-thermal expansion alloy forming sample by adopting a laser selective melting technology to obtain the integrated bimetallic material.
Further defined, the high thermal expansion alloy powder is a Ni22Cr3 powder or a Ni19Mn7 powder.
Further defined, the alloy powder has a particle size of 15-53 μm.
Further defined, the alloy powder preparation process is: the ingot is prepared by a vacuum induction smelting mode, and the metal powder is prepared by adopting a process of atomizing and pulverizing by a plasma rotary electrode, so that the sphericity of the powder is better, the special-shaped powder and satellite powder are basically avoided, and the surface of the powder is smooth.
Further defined, the Ni22Cr3 powder comprises the following components in percentage by weight: c:3.05%, ni:22.07%, mn:0.087%, cr:3.05%, si:0.013%, the balance being Fe.
Further defined, the low thermal expansion alloy powder is 4J36 or 4J32.
Further defined, the 4J36 powder comprises the following components in percentage by weight: c:0.0078%, ni:35.25%, mn:0.217%, si:0.097%, the balance being Fe.
Further defined, the single layer print thickness during both the first and second print forming processes was 0.04mm.
Further defined as a laser energy density of 43.561-69.444J/mm during the first and second print forming processes 3 。
Further defined, the printing parameters in the printing forming process in the first step are as follows: the laser power is 200-290W, the track interval is 0.06-0.12mm, and the scanning speed is 900-1100mm/s.
Further defined, the printing parameters in the step of printing and forming are as follows: the laser power was 230W, the track pitch was 0.09mm, and the scanning rate was 1100mm/s.
Further defined, the printing parameters in the second printing forming process are as follows: the laser power is 200W, the track pitch is 0.08mm, and the scanning speed is 900mm/s.
The invention has the following beneficial effects:
according to the invention, by selecting different laser powers, scanning rates, track intervals and laser energy densities, the influence of different process parameters on the printing quality of the alloy and the quality of interface combination between the alloys is explored, so that the 3D printing process for the bimetal material with complex shape and small size is obtained. Meanwhile, the bimetal material prepared by the process has high density, good metallographic structure quality, good mechanical property and good interface combination, and can be used for preparing the microstructure of the mechanical metamaterial.
Drawings
FIG. 1 is an electron micrograph (500X) of Ni22Cr3 alloy powder;
FIG. 2 is an electron micrograph (500X) of 4J36 alloy powder;
FIG. 3 is a graph showing the effect of different track pitches on the density of Ni22Cr3 alloy;
FIG. 4 is a photograph of a metallographic structure of Ni22Cr3 prepared in example 1;
FIG. 5 is an XRD pattern of Ni22Cr3 prepared in example 1;
FIG. 6 is a photograph of a metallographic structure of Ni22Cr3 prepared in example 2;
FIG. 7 is a photograph of a metallographic structure of 4J36 prepared in example 3;
FIG. 8 is an XRD pattern for 4J36 prepared in example 3;
FIG. 9 is a multi-specimen tensile curve of 4J36 prepared in example 3;
FIG. 10 is an SEM photograph of the interface of 4J36/Ni22Cr3 bimetal prepared in example 4;
FIG. 11 is a physical view of a 4J36/Ni22Cr3 bimetal binding test bar prepared in example 5.
Detailed Description
The experimental methods used in the following examples are conventional methods unless otherwise specified. The materials, reagents, methods and apparatus used, without any particular description, are those conventional in the art and are commercially available to those skilled in the art.
Example 1:
(1) Ni22Cr3 powder is selected to prepare the high thermal expansion alloy:
the Ni22Cr3 powder comprises the following components in percentage by weight: c:3.05%, ni:22.07%, mn:0.087%, cr:3.05%, si:0.013%, the balance being Fe. The grain size of the Ni22Cr3 powder is 15-53 mu m, the microstructure of the Ni22Cr3 is characterized, and the result is shown in figure 1, the sphericity of the powder is good, the powder is basically free of special-shaped powder and satellite powder, and the surface of the powder is smooth.
(2) Printing and forming Ni22Cr3 powder by adopting a laser selective melting technology to obtain a Ni22Cr3 alloy forming sample, wherein specific printing parameters are as follows: laser power 200W, track pitch 0.08mm, scanning rate 900mm/s, laser energy density 69.444J/mm 3 The single-layer printing thickness was 0.04mm.
The metallographic structure of the formed sample is as shown in figure 4, and as can be seen from figure 4, the surface quality of the metallographic structure is good, the metallographic structure is smooth, has no obvious defects of holes, cracks and the like, and the compactness is high.
The structure test of the formed sample comprises the following operation procedures: firstly, the formed sample is ultrasonically oscillated and cleaned in acetone solution for 10min, phase and structure analysis is carried out by using an Empyrean type X-ray diffractometer (Cu target) of the Paraco, the step length is 0.02 DEG, the scanning range is 20 DEG-10 DEG, the test result is shown in figure 5, and the diffraction peak is calibrated to find that the SLM deposition state structure of the Ni22Cr3 alloy formed sample is a biphase structure.
Example 2:
this embodiment differs from embodiment 1 in that: the printing parameters are set as follows: laser power 230W, track pitch 0.12mm, scanning rate 1100mm/s, laser energy density 43.561J/mm 3 The single-layer printing thickness was 0.04mm. The metallographic structure of the formed sample is shown in figure 6, the surface structure is smooth, the cracks are few, and the compactness is 99.988%.
The mechanical properties of the formed samples were tested and the results were: the micro Vickers hardness is HV200.9, the tensile strength is 640.24MPa, the yield strength is 386.55MPa, and the elongation is 26.75%.
Example 3:
(1) 4J36 powder is selected to prepare the low thermal expansion alloy:
4J36 powder, which comprises the following components in percentage by weight: c:0.0078%, ni:35.25%, mn:0.217%, si:0.097%, the balance being Fe. The particle size of the 4J36 powder is 15-53 mu m, the microcosmic structure of the 4J36 is characterized, and the result is shown in figure 2, the sphericity of the powder is good, the powder is basically free of special-shaped powder and satellite powder, and the surface of the powder is smooth.
(2) Printing and forming 4J36 powder by adopting a laser selective melting technology to obtain a 4J36 alloy formed sample, wherein specific printing parameters are as follows: laser power 200W, track pitch 0.08mm, scanning rate 900mm/s, laser energy density 69.444J/mm 3 The single-layer printing thickness was 0.04mm.
The metallographic structure of the formed sample is as shown in fig. 7, and as can be seen from fig. 7, the surface structure of the formed sample is smooth, the cracks are less, and the compactness is 99.988%.
The structural test of the formed sample, the operation flow is the same as in example 1, and the test result is shown in fig. 8, wherein the 4J36 alloy SLM deposit structure is a single-phase austenite structure.
As a result of preparing 3 molded samples (designated as 4J36-1#, 4J36-2# and 4J36-3#, respectively) and performing mechanical property tests, as shown in FIG. 9, the tensile strengths of 4J36-1#, 4J36-2# and 4J36-3# were 445.62MPa,452.02MPa and 448.76MPa, respectively, and the yield strengths were 285.76MPa,284.17MPa and 271.17MPa, respectively, and the elongations were 27.15%,31.57% and 29.39%, respectively, whereby it was found that the molded results were ideal and that the fluctuation of mechanical properties between the different samples was small.
Example 4:
interfacial bonding of 4J36 and Ni22Cr3 bimetal is carried out by adopting a sectional forming mode:
(1) Printing and forming a 4J36 alloy forming sample by adopting a laser selective melting technology; the specific 4J36 powder was the same as in example 3, and the printing parameters were: laser power 200W, track pitch 0.08mm, scanning rate 900mm/s, laser energy density 69.444J/mm 3 The single-layer printing thickness was 0.04mm.
(2) On the 4J36 alloy forming sample obtained in the step (1), a laser selective melting technology is adopted to print and form a Ni22Cr3 alloy forming sample, and specific Ni22Cr3 powder is the same as that in the example 1, and the printing parameters are as follows: laser power 230W, track pitch 0.09mm, sweepThe tracing rate is 1100mm/s, and the laser energy density is 69.444J/mm 3 The single-layer printing thickness is 0.04mm, and the 4J36/Ni22Cr3 bimetallic material is obtained.
The microstructure characterization is carried out on the junction of the 4J36/Ni22Cr3 interface of the 4J36/Ni22Cr3 bimetallic material, and as shown in a result of fig. 10, a molten pool and columnar crystals can be observed, the columnar crystals grow along the temperature gradient direction of the molten pool, the columnar crystals are internally composed of cellular crystals, and a bonding interface cannot be observed in an enlarged tissue morphology photo, so that the two materials can be known to be completely metallurgically bonded, and the interface is compact.
Example 5:
printing of the 4J36/Ni22Cr3 binding test bars was performed by means of the sectional forming method, printing parameters were set to be the same as in example 4, and cylindrical test bars with diameters of 13mm and heights of 74mm were obtained as shown in FIG. 11 a), and were then processed into mechanical property test samples as shown in FIG. 11 b).
The mechanical property test is carried out by adopting 3 groups of parallel samples, the tensile strength is 443.64MPa,445.35MPa,442.48MPa, the yield strength is 341.12MPa,363.34MPa,375.26MPa, the tensile strain is 24.19%,24.14% and 24.15%, therefore, the molding result is ideal, and the fluctuation of mechanical properties among different samples is small.
Example 6:
the influence of different channel pitches on the density of the Ni22Cr3 alloy is discussed, and 0.06mm,0.08mm,0.1 and 0.12mm are respectively selected as the channel pitches; the laser power is 200W,230W,260W and 290W respectively; the scanning rates are 900mm/s, 1000mm/s and 1100mm/s respectively; laser energy density 69.444J/mm 3 The density of the obtained sample was measured by printing a single layer with a thickness of 0.04mm, and as shown in fig. 3, the effect of the track pitch on the density of the sample was not significant as can be seen from fig. 3.
The previous description of the embodiments is provided to facilitate a person of ordinary skill in the art in order to make and use the present invention. It will be apparent to those skilled in the art that various modifications can be readily made to these embodiments and the generic principles described herein may be applied to other embodiments without the use of the inventive faculty. Therefore, the present invention is not limited to the above-described embodiments, and those skilled in the art, based on the present disclosure, should make improvements and modifications without departing from the scope of the present invention.

Claims (3)

1. A method for 3D printing of a bi-metallic material, the method comprising the steps of:
(1) Printing and forming a 4J36 alloy forming sample by adopting a laser selective melting technology; the specific printing parameters are as follows: laser power 200W, track pitch 0.08mm, scanning rate 900mm/s, laser energy density 69.444J/mm 3 Single-layer printing thickness is 0.04mm;
(2) Printing and forming a Ni22Cr3 alloy forming sample on the 4J36 alloy forming sample obtained in the step (1) by adopting a laser selective melting technology, wherein specific printing parameters are as follows: laser power 230W, track pitch 0.09mm, scanning rate 1100mm/s, laser energy density 69.444J/mm 3 The single-layer printing thickness is 0.04mm, and the 4J36/Ni22Cr3 bimetallic material is obtained;
the grain size of Ni22Cr3 powder is 15-53 μm.
2. The 3D printing method of a bimetal material of claim 1, wherein the Ni22Cr3 powder comprises the following components in percentage by weight: c:3.05%, ni:22.07%, mn:0.087%, cr:3.05%, si:0.013%, the balance being Fe.
3. The 3D printing method of a bimetal material of claim 1, wherein the 4J36 powder comprises the following components in percentage by weight: c:0.0078%, ni:35.25%, mn:0.217%, si:0.097%, the balance being Fe.
CN202210485114.4A 2022-05-06 2022-05-06 3D printing method for bimetal material Active CN114871452B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160003521A (en) * 2014-07-01 2016-01-11 부산대학교 산학협력단 Manufacturing methods of functionally graded objects Induced by Direct Laser Melting of Compositionally Selected Metallic Powders and freedom in 3D design
CN109530697A (en) * 2018-12-28 2019-03-29 钢铁研究总院 A kind of high-strength low-density low bulk iron-nickel alloy and preparation method thereof
CN110394446A (en) * 2019-08-22 2019-11-01 北京理工大学 A kind of connection structure of different metal materials and attaching method thereof
CN110405204A (en) * 2018-04-28 2019-11-05 深圳市裕展精密科技有限公司 The preparation method of dissimilar metal components
CN112775431A (en) * 2020-12-25 2021-05-11 北京航空航天大学合肥创新研究院 Laser additive manufacturing method of titanium alloy/stainless steel dissimilar metal component
CN113275593A (en) * 2021-04-27 2021-08-20 中南大学 Method for preparing porous Ta/Ti-6Al-4V integrated piece by selective laser melting

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20160003521A (en) * 2014-07-01 2016-01-11 부산대학교 산학협력단 Manufacturing methods of functionally graded objects Induced by Direct Laser Melting of Compositionally Selected Metallic Powders and freedom in 3D design
CN110405204A (en) * 2018-04-28 2019-11-05 深圳市裕展精密科技有限公司 The preparation method of dissimilar metal components
CN109530697A (en) * 2018-12-28 2019-03-29 钢铁研究总院 A kind of high-strength low-density low bulk iron-nickel alloy and preparation method thereof
CN110394446A (en) * 2019-08-22 2019-11-01 北京理工大学 A kind of connection structure of different metal materials and attaching method thereof
CN112775431A (en) * 2020-12-25 2021-05-11 北京航空航天大学合肥创新研究院 Laser additive manufacturing method of titanium alloy/stainless steel dissimilar metal component
CN113275593A (en) * 2021-04-27 2021-08-20 中南大学 Method for preparing porous Ta/Ti-6Al-4V integrated piece by selective laser melting

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