CN111992715A - Laser-induced interface in-situ reaction enhanced titanium alloy additive manufacturing method - Google Patents
Laser-induced interface in-situ reaction enhanced titanium alloy additive manufacturing method Download PDFInfo
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- CN111992715A CN111992715A CN202010855583.1A CN202010855583A CN111992715A CN 111992715 A CN111992715 A CN 111992715A CN 202010855583 A CN202010855583 A CN 202010855583A CN 111992715 A CN111992715 A CN 111992715A
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 162
- 239000000654 additive Substances 0.000 title claims abstract description 25
- 230000000996 additive effect Effects 0.000 title claims abstract description 25
- 238000006243 chemical reaction Methods 0.000 title claims abstract description 24
- 238000011065 in-situ storage Methods 0.000 title claims abstract description 24
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 24
- 239000000843 powder Substances 0.000 claims abstract description 96
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 85
- 238000010288 cold spraying Methods 0.000 claims abstract description 71
- 239000007921 spray Substances 0.000 claims abstract description 55
- 239000000758 substrate Substances 0.000 claims abstract description 39
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 37
- 239000002245 particle Substances 0.000 claims abstract description 30
- 238000005507 spraying Methods 0.000 claims abstract description 24
- 238000000576 coating method Methods 0.000 claims abstract description 17
- 239000011248 coating agent Substances 0.000 claims abstract description 15
- 230000009471 action Effects 0.000 claims abstract description 6
- 238000004093 laser heating Methods 0.000 claims abstract description 6
- 238000002844 melting Methods 0.000 claims abstract description 5
- 239000011159 matrix material Substances 0.000 claims description 18
- 230000001105 regulatory effect Effects 0.000 claims description 16
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 15
- 238000004140 cleaning Methods 0.000 claims description 8
- 229910001199 N alloy Inorganic materials 0.000 claims description 6
- 239000010410 layer Substances 0.000 claims description 6
- 238000001035 drying Methods 0.000 claims description 5
- 230000001678 irradiating effect Effects 0.000 claims description 5
- 238000005488 sandblasting Methods 0.000 claims description 5
- 230000001276 controlling effect Effects 0.000 claims description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 claims description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 3
- 239000010431 corundum Substances 0.000 claims description 3
- 230000005855 radiation Effects 0.000 claims description 3
- 239000002356 single layer Substances 0.000 claims description 3
- 230000003746 surface roughness Effects 0.000 claims description 3
- 230000006698 induction Effects 0.000 abstract description 3
- 239000004033 plastic Substances 0.000 abstract description 3
- 239000011148 porous material Substances 0.000 abstract description 2
- 239000000463 material Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000012876 topography Methods 0.000 description 2
- 229910000883 Ti6Al4V Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 239000001307 helium Substances 0.000 description 1
- 229910052734 helium Inorganic materials 0.000 description 1
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000005498 polishing Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
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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
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/10—Sintering only
- B22F3/1039—Sintering only by reaction
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- 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
-
- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C24/00—Coating starting from inorganic powder
- C23C24/02—Coating starting from inorganic powder by application of pressure only
- C23C24/04—Impact or kinetic deposition of particles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F2999/00—Aspects linked to processes or compositions used in powder metallurgy
-
- 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
Abstract
The invention discloses a laser-induced interface in-situ reaction enhanced titanium alloy additive manufacturing method, which comprises the steps of firstly pouring atomized titanium alloy powder into a powder feeder, enabling high-pressure nitrogen to pass through the powder feeder and a cold spraying spray gun, and spraying the titanium alloy powder and the high-pressure nitrogen onto the surface of a titanium alloy substrate through the cold spraying spray gun; and during spraying, synchronously starting the laser generator to irradiate laser on the titanium alloy powder particles sprayed on the surface of the titanium alloy substrate, wherein the titanium alloy powder particles are subjected to surface micro-melting under the action of laser heating and are subjected to action of surrounding high-pressure nitrogen flow to generate in-situ reaction, the titanium alloy powder particles are subjected to mechanical and metallurgical combination, and a titanium alloy coating is formed on the titanium alloy substrate, so that the high-density titanium alloy part is prepared. According to the invention, through laser induction, the plastic deformation capacity of the powder is improved, so that the bonding pores are reduced, and the in-situ nitridation reaction is utilized to generate metallurgical bonding to strengthen the titanium alloy component, so that the product quality is improved.
Description
Technical Field
The invention relates to the field of titanium alloy additive manufacturing, in particular to a laser-induced interface in-situ reaction enhanced titanium alloy additive manufacturing method.
Background
The titanium alloy (Ti6Al4V) has excellent mechanical, physical and chemical properties such as high specific strength, good corrosion resistance, good biocompatibility and the like, and becomes an indispensable key material for high technologies such as aviation, aerospace and the like. At present, when a technology related to high-temperature melting is adopted to manufacture a titanium alloy component in an additive mode, inert atmosphere (such as argon) or vacuum environment is usually adopted to protect the titanium alloy component, and impurity phases caused by a high-temperature metallurgical process are avoided. The cold spraying technology can avoid the adverse effects of heat caused by high temperature process such as oxidation, phase change, decomposition and the like, but the method can realize the solid deposition of the material by completely depending on the kinetic energy when the high-speed particles impact, and the bonding mechanism is mainly mechanical bonding, but not metallurgical bonding in the high-temperature melting process. In the process of cold spraying technology, the plastic deformation of titanium alloy particles is limited, and poor particle interface combination can cause a titanium alloy component to have higher porosity and influence service performance.
Disclosure of Invention
The invention aims to solve the problems that poor grain interface combination in the existing cold spraying titanium alloy technology can cause a titanium alloy component to have higher porosity and influence the service performance of the titanium alloy, and provides a laser-induced interface in-situ reaction enhanced titanium alloy additive manufacturing method.
The invention realizes the purpose through the following technical scheme: a laser-induced interface in-situ reaction enhanced titanium alloy additive manufacturing method comprises the steps of firstly pouring atomized titanium alloy powder into a powder feeder, enabling high-pressure nitrogen to pass through the powder feeder and a cold spraying spray gun, and spraying the titanium alloy powder and the high-pressure nitrogen onto the surface of a titanium alloy substrate through the cold spraying spray gun; and during spraying, synchronously starting the laser generator, irradiating laser beams emitted by the laser generator on particles of the titanium alloy powder sprayed on the surface of the titanium alloy substrate, carrying out surface micro-melting on the particles of the titanium alloy powder under the action of laser heating and acting with surrounding high-pressure nitrogen flow to carry out in-situ reaction, carrying out mechanical and metallurgical combination on the particles of the titanium alloy powder, and forming a titanium alloy coating on the titanium alloy substrate, thereby preparing the high-density titanium alloy part.
The method specifically comprises the following steps:
the method comprises the following steps: carrying out surface pretreatment of sand blasting, cleaning and wiping drying on the titanium alloy matrix in sequence, and horizontally placing the titanium alloy matrix on a workbench after treatment;
step two: integrating a cold spraying spray gun and a laser head connected with a laser generator on a movable mechanical arm, wherein the opening of the cold spraying spray gun faces downwards and is vertically arranged, the laser head and the cold spraying spray gun are arranged on the same vertical surface, an included angle between the cold spraying spray gun and the laser head is 10-80 degrees, and the position of the laser head is adjusted so that the irradiation area of laser radiation emitted by the laser head on a titanium alloy substrate during processing completely covers the spraying area of particles sprayed by the cold spraying spray gun on the titanium alloy substrate;
step three: carrying out baking intervention treatment on the titanium alloy powder before spraying; putting the dried titanium alloy powder into a powder feeder;
step four: an output pipe of a nitrogen supply device is divided into a first output branch pipe and a second output branch pipe by a three-way pipe, a flow valve is arranged on the output pipe of the nitrogen supply device, the first output branch pipe is connected with a cold spraying spray gun through a powder feeder, nitrogen in the first output branch pipe provides power for the powder feeder to feed powder to the cold spraying spray gun, and a first pressure regulating valve for controlling the pressure of the fed powder is arranged on the first output branch pipe; the second output branch pipe is connected to the position of an input port of the cold spraying spray gun after passing through the heating device, high-pressure nitrogen and titanium alloy powder heated by the heating device are simultaneously sent out from an outlet of the cold spraying spray gun when the cold spraying spray gun works, and a second pressure regulating valve is arranged on the second output branch pipe;
step five: the nitrogen pressure is adjusted to be 3-5 MPa through the flow valve and the second pressure regulating valve, and the nitrogen flow is 100-300 Nm3Regulating the heating temperature of the heater to be 500-1000 ℃ and regulating the powder feeding rotating speed of the powder feeder to be 1-5 r/min; setting laser power of 500-1000W in a control panel of a laser generator;
step six: correcting the relative positions of the cold spraying powder spots and the laser spots by adjusting the spraying distance of the cold spraying spray gun and the laser rubber mat position of the laser head, so that the cold spraying powder spots and the laser spots are positioned in the same horizontal plane, the cold spraying powder spots are smaller than the laser spots, and the spraying distance of the powder coating spots is 10-50 mm;
step seven: opening the nitrogen supply device, the heating device and the laser generator, simultaneously spraying heated high-pressure nitrogen and titanium alloy powder from an outlet of the cold spraying spray gun onto the titanium alloy substrate, simultaneously irradiating laser spots emitted by the laser head onto the titanium alloy substrate, and overlapping the cold spraying powder spots sprayed by the cold spraying spray gun and the laser spots emitted by the laser head on the titanium alloy substrate; when the titanium alloy powder sprayed by the cold spraying spray gun is sprayed on a titanium alloy substrate, the particles of the titanium alloy powder are instantaneously heated by synchronously coupled laser, so that the particle surfaces of the titanium alloy powder are micro-melted and generate in-situ reaction with nitrogen, and then the particles of the titanium alloy powder are mechanically and metallurgically combined after being impacted, and a titanium alloy coating is formed on the titanium alloy substrate;
step eight: the movable mechanical arm is used for controlling the cold spraying spray gun and the laser head to synchronously and horizontally reciprocate, after single-layer scanning is finished, the mechanical arm automatically lifts a certain height to eliminate the influence of the height of the deposited titanium alloy coating on the overlap ratio of subsequent light spots, the titanium alloy coatings piled layer by layer are obtained on the surface of the titanium alloy substrate, and then the high-quality strengthened titanium alloy additive manufacturing component is obtained.
Further, in the first step, the surface of the titanium alloy substrate is pretreated by: carrying out sand blasting treatment by using No. 24 white corundum under the condition that the air pressure is 0.8MPa, improving the surface roughness of the titanium alloy matrix and removing oxide skin on the surface of the titanium alloy matrix, then cleaning by using absolute ethyl alcohol with the concentration of 99.5%, and wiping and drying the titanium alloy matrix after cleaning.
Furthermore, the moving speed of the movable mechanical arm is 10-50 mm/s.
The principle of the invention is as follows: the laser heating is synchronously coupled in the process of cold spraying the titanium alloy powder, particles of the titanium alloy powder are induced to interact with surrounding high-concentration nitrogen at the moment of deposition on the basis of the laser heating softening effect, in-situ nitridation reaction is carried out at the particle interface of the titanium alloy powder, and the regulation and control of the particle interface structure of the titanium alloy powder are realized, so that the aims of metallurgical bonding, porosity reduction and compactness improvement are fulfilled. Meanwhile, the problem of high porosity caused by poor single mechanical occlusion during cold spraying additive manufacturing of the titanium alloy component is solved, and the comprehensive mechanical property of the titanium alloy coating is greatly improved.
The invention has the beneficial effects that: according to the invention, through laser induction, the plastic deformation capacity of the powder is improved, so that the bonding pores are reduced, and the in-situ nitridation reaction is utilized to generate metallurgical bonding to strengthen the titanium alloy component, so that the product quality is improved; the nitrogen replaces expensive helium, the same material increase effect is achieved, the overall production cost is reduced, meanwhile, the complex process for improving the compactness of the titanium alloy component through subsequent heat treatment is eliminated, the process flow is simplified, and the production efficiency is improved.
Drawings
Fig. 1 is a schematic overall structure diagram of an apparatus used in the method for manufacturing a titanium alloy additive material with enhanced laser-induced interface in-situ reaction according to the present invention.
FIG. 2 is a schematic diagram of the laser-induced interfacial in-situ reaction of the present invention.
Fig. 3 is a titanium alloy microstructure topography of a titanium alloy additive manufacturing component manufactured by the laser-induced interface in-situ reaction enhanced titanium alloy additive manufacturing method under the jurisdiction of a scanning electron microscope.
Fig. 4 is a titanium alloy microstructural topography under the jurisdiction of a scanning electron microscope for a titanium alloy additive manufactured component that was not prepared using laser induction.
In the figure, 1-nitrogen supply device, 2-flow valve, 3-first pressure regulating valve, 4-second pressure regulating valve, 5-powder feeder, 6-heating device, 7-heating power supply, 8-cold spraying spray gun, 9-laser head, 10-titanium alloy substrate, 11-workbench, 12-titanium alloy powder, 13-high pressure nitrogen flow, 14-laser beam, 15-first output branch pipe and 16-second output branch pipe.
Detailed Description
The invention will be further described with reference to the accompanying drawings in which:
as shown in fig. 1 to 4, a method for manufacturing a titanium alloy additive material with enhanced laser-induced interface in-situ reaction comprises the steps of firstly pouring atomized titanium alloy powder 12 into a powder feeder 5, allowing high-pressure nitrogen to pass through the powder feeder 5 and a cold spray gun 8, and spraying the titanium alloy powder 12 and the high-pressure nitrogen onto the surface of a titanium alloy substrate 10 by the cold spray gun 8; during spraying, the laser generator is synchronously started, laser beams 14 emitted by the laser generator are irradiated on particles of titanium alloy powder 12 sprayed on the surface of a titanium alloy substrate 10, the particles of the titanium alloy powder 12 are subjected to surface micro-melting under the action of laser heating and are subjected to action of surrounding high-pressure nitrogen flow 13 to generate in-situ reaction, the particles of the titanium alloy powder 12 are subjected to mechanical and metallurgical combination, and a titanium alloy coating is formed on the titanium alloy substrate 10, so that the high-density titanium alloy part is prepared.
The invention selects a titanium alloy matrix 10 with the thickness of 150mm by 50mm by 10mm as a matrix material to carry out titanium alloy additive operation, and concretely comprises the following steps:
the method comprises the following steps: the surface of the titanium alloy substrate 10 is pretreated in the following manner: carrying out sand blasting treatment by using No. 24 white corundum under the condition that the air pressure is 0.8MPa, improving the surface roughness of the titanium alloy matrix 10 and removing oxide skin on the surface of the titanium alloy matrix 10, then cleaning by using absolute ethyl alcohol with the concentration of 99.5%, and wiping and drying the titanium alloy matrix 10 after cleaning; after treatment, horizontally placing the titanium alloy matrix 10 on a workbench 11;
step two: integrating a cold spraying spray gun 8 and a laser head 9 connected with a laser generator on a movable mechanical arm, wherein the cold spraying spray gun 8 is provided with a downward opening and is vertically arranged, the laser head 9 and the cold spraying spray gun 8 are arranged on the same vertical plane, an included angle between the cold spraying spray gun 8 and the laser head 9 is 30 degrees, and the position of the laser head 9 is adjusted to ensure that the irradiation area of laser radiation emitted by the laser head 9 on a titanium alloy substrate 10 during processing completely covers the spraying area of the particles sprayed by the cold spraying spray gun 8 on the titanium alloy substrate 10;
step three: carrying out baking intervention treatment on the titanium alloy powder 12 before spraying; and the dried titanium alloy powder 12 is loaded into a powder feeder 5;
step four: an output pipe of a nitrogen supply device 1 is divided into a first output branch pipe 15 and a second output branch pipe 16 by a three-way pipe, a flow valve is arranged on the output pipe of the nitrogen supply device 1, the first output branch pipe 15 is connected with a cold spraying spray gun 8 through a powder feeder 5, nitrogen in the first output branch pipe 15 provides power for the powder feeder 5 to feed powder to the cold spraying spray gun 8, and a first pressure regulating valve 3 for controlling the powder feeding pressure is arranged on the first output branch pipe 15; the second output branch pipe 16 is connected to the position of an input port of the cold spraying spray gun 8 after passing through the heating device 6, when the cold spraying spray gun 8 works, high-pressure nitrogen and titanium alloy powder 12 heated by the heating device 6 are simultaneously sent out from an outlet of the cold spraying spray gun 8, and a second pressure regulating valve (4) is arranged on the second output branch pipe 16;
step five: the second output branch pipe 16 is provided with a flow valve 2 and a second pressure regulating valve 4, the nitrogen pressure is regulated to be 4MPa through the flow valve 2 and the pressure regulating valve 4, the nitrogen flow is regulated to be 200Nm3/h, the heating temperature of a heater is regulated to be 800 ℃, the powder feeding rotating speed of a powder feeder 5 is regulated to be 1.5r/min, and the laser power is set to be 800W in a control panel of a laser generator;
correcting the relative positions of the cold spraying powder spots and the laser spots by adjusting the spraying distance of the cold spraying spray gun 8 and the laser rubber mat position of the laser head 9, so that the cold spraying powder spots and the laser spots are positioned in the same horizontal plane, the cold spraying powder spots are smaller than the laser spots, and the spraying distance of the cold spraying powder spots is 40 mm; this step can also be adjusted before the process is carried out;
step six: opening the nitrogen supply device 1, the heating device 6 and the laser generator, simultaneously spraying heated high-pressure nitrogen and titanium alloy powder 12 from an outlet of the cold spraying spray gun 8 onto the titanium alloy substrate 10, simultaneously irradiating laser spots emitted by the laser head 9 onto the titanium alloy substrate 10, and overlapping the cold spraying powder spots sprayed by the cold spraying spray gun 8 and the laser spots emitted by the laser head 9 on the titanium alloy substrate 10; when the titanium alloy powder 12 sprayed by the cold spraying spray gun 8 is sprayed on the titanium alloy substrate 10, the particles of the titanium alloy powder 12 are instantaneously heated by the synchronously coupled laser, so that the particle surfaces of the titanium alloy powder 12 are slightly melted and generate in-situ reaction with nitrogen, and then the particles of the titanium alloy powder 12 are mechanically and metallurgically bonded after being impacted, and a titanium alloy coating is formed on the titanium alloy substrate 10;
step seven: the cold spraying spray gun 8 and the laser head 9 are controlled to synchronously horizontally reciprocate by the movable mechanical arm, after single-layer scanning is finished, the mechanical arm automatically lifts a certain height to eliminate the influence of the height of the deposited titanium alloy coating on the overlap ratio of subsequent light spots, the titanium alloy coatings piled layer by layer are obtained on the surface of the titanium alloy substrate 10, and then the high-quality strengthened titanium alloy additive manufacturing component is obtained.
Step eight: the prepared titanium alloy additive manufacturing component is inlaid, ground, polished and corroded, finally the coating morphology of the sample is observed under the magnification of 2kX through a scanning electron microscope, and the morphology of the titanium alloy microstructure is observed at the middle position as shown in figure 3.
And simultaneously, carrying out a reference example, selecting a same titanium alloy matrix with the thickness of 150mm x 50mm x 10mm for an experiment, completing all the steps from the first step to the seventh step under the condition that a laser generator is not opened in the whole process, obtaining a titanium alloy additive material which is not induced by laser, inlaying, grinding, polishing and corroding the prepared titanium alloy additive material manufacturing component, finally observing the coating morphology of the sample under the magnification of 2kX through a scanning electron microscope, and selecting the middle position to observe the morphology of the titanium alloy microstructure as shown in figure 4.
The above embodiments are only preferred embodiments of the present invention, and are not intended to limit the technical solutions of the present invention, so long as the technical solutions can be realized on the basis of the above embodiments without creative efforts, which should be considered to fall within the protection scope of the patent of the present invention.
Claims (4)
1. The laser-induced interface in-situ reaction enhanced titanium alloy additive manufacturing method is characterized by comprising the following steps of: firstly, pouring atomized titanium alloy powder (12) into a powder feeder (5), enabling high-pressure nitrogen to pass through the powder feeder (5) and a cold spraying spray gun (8), and spraying the titanium alloy powder (12) and the high-pressure nitrogen onto the surface of a titanium alloy substrate (10) through the cold spraying spray gun (8); and during spraying, synchronously starting the laser generator, irradiating laser beams (14) emitted by the laser generator on particles of titanium alloy powder (12) sprayed on the surface of the titanium alloy substrate (10), micro-melting the surfaces of the particles of the titanium alloy powder (12) under the action of laser heating, reacting with surrounding high-pressure nitrogen flow (13) to generate in-situ reaction, and mechanically and metallurgically combining the particles of the titanium alloy powder (12) to form a titanium alloy coating on the titanium alloy substrate (10), thereby preparing the high-density titanium alloy part.
2. The laser-induced interface in-situ reaction enhanced titanium alloy additive manufacturing method of claim 1, wherein: the method specifically comprises the following steps:
the method comprises the following steps: carrying out surface pretreatment of sand blasting, cleaning and wiping drying on the titanium alloy matrix (10) in sequence, and horizontally placing the titanium alloy matrix (10) on a workbench (11) after treatment;
step two: integrating a cold spraying spray gun (8) and a laser head (9) connected with a laser generator on a movable mechanical arm, wherein the cold spraying spray gun (8) is provided with an opening facing downwards and vertically, the laser head (9) and the cold spraying spray gun (8) are arranged on the same vertical plane, an included angle between the cold spraying spray gun (8) and the laser head (9) is 10-80 degrees, and the position of the laser head (9) is adjusted to enable the irradiation area of laser radiation emitted by the laser head (9) on a titanium alloy substrate (10) to completely cover the spraying area of spraying particles of the cold spraying spray gun (8) on the titanium alloy substrate (10) during processing;
step three: carrying out baking intervention treatment on the titanium alloy powder (12) before spraying; putting the dried titanium alloy powder (12) into a powder feeder (5);
step four: an output pipe of a nitrogen supply device (1) is divided into a first output branch pipe (15) and a second output branch pipe (16) by a three-way pipe, a flow valve is arranged on the output pipe of the nitrogen supply device (1), the first output branch pipe (15) is connected with a cold spraying spray gun (8) through a powder feeder (5), nitrogen in the first output branch pipe (15) provides power for the powder feeder (5) to feed powder to the cold spraying spray gun (8), and a first pressure regulating valve (3) for controlling the pressure of the fed powder is arranged on the first output branch pipe (15); the second output branch pipe (16) is connected to the position of an input port of the cold spraying spray gun (8) after passing through the heating device (6), when the cold spraying spray gun (8) works, high-pressure nitrogen and titanium alloy powder (12) heated by the heating device (6) are simultaneously sent out from an outlet of the spray gun of the cold spraying spray gun (8), and a second pressure regulating valve (4) is arranged on the second output branch pipe (16);
step five: the nitrogen pressure is adjusted to be 3-5 MPa through the flow valve (2) and the second pressure adjusting valve (4), and the nitrogen flow is 100-300 Nm3H, adjusting the heating temperature of the heater to be 500-1000 ℃, and adjusting the powder feeding rotating speed of the powder feeder (5) to be 1-5 r/min; setting laser power of 500-1000W in a control panel of a laser generator
Step six: correcting the relative positions of the cold spraying powder spot and the laser spot by adjusting the spraying distance of the cold spraying spray gun (8) and the laser rubber mat position of the laser head (9), so that the cold spraying powder spot and the laser spot are positioned in the same horizontal plane, the cold spraying powder spot is smaller than the laser spot, and the spraying distance of the cold spraying powder spot is 10-50 mm;
step seven: opening a nitrogen supply device (1), a heating device (6) and a laser generator, simultaneously spraying heated high-pressure nitrogen and titanium alloy powder (12) from an outlet of a cold spraying spray gun (8) onto a titanium alloy substrate (10), simultaneously irradiating laser spots emitted by a laser head (9) onto the titanium alloy substrate (10), and superposing the cold spraying powder spots sprayed by the cold spraying spray gun (8) and the laser spots emitted by the laser head (9) on the titanium alloy substrate (10); when the titanium alloy powder (12) sprayed by the cold spraying spray gun (8) is sprayed on the titanium alloy substrate (10), the particles of the titanium alloy powder (12) are instantaneously heated by synchronously coupled laser, so that the particle surfaces of the titanium alloy powder (12) are micro-melted and generate in-situ reaction with nitrogen, and then the particles of the titanium alloy powder (12) are mechanically and metallurgically bonded after being impacted, and a titanium alloy coating is formed on the titanium alloy substrate (10);
step eight: the cold spraying spray gun (8) and the laser head (9) are controlled to synchronously and horizontally reciprocate by the movable mechanical arm, after single-layer scanning is finished, the mechanical arm automatically lifts a certain height to eliminate the influence of the height of the deposited titanium alloy coating on the contact ratio of subsequent light spots, the titanium alloy coating piled layer by layer is obtained on the surface of the titanium alloy substrate (10), and then the high-quality strengthened titanium alloy additive manufacturing component is obtained.
3. The laser-induced interface in-situ reaction enhanced titanium alloy additive manufacturing method of claim 2, wherein: the surface pretreatment mode of the titanium alloy matrix (10) in the first step is as follows: carrying out sand blasting treatment by using No. 24 white corundum under the condition that the air pressure is 0.8MPa, improving the surface roughness of the titanium alloy matrix (10) and removing oxide skin on the surface of the titanium alloy matrix (10), then cleaning by using absolute ethyl alcohol with the concentration of 99.5%, and wiping and drying the titanium alloy matrix (10) after cleaning.
4. The laser-induced interface in-situ reaction enhanced titanium alloy additive manufacturing method of claim 2, wherein: the moving speed of the movable mechanical arm is 10-50 mm/s.
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| CN112692303A (en) * | 2020-12-14 | 2021-04-23 | 江苏大学 | Device and method for preparing microfluidic 3D printing composite material |
| CN112718290A (en) * | 2020-12-15 | 2021-04-30 | 中国人民解放军空军工程大学 | Electron beam assisted vacuum electric scanning supersonic speed deposition spray gun |
| CN112776322A (en) * | 2020-12-15 | 2021-05-11 | 重庆交通大学绿色航空技术研究院 | Vacuum electric scanning supersonic jet deposition electron beam additive manufacturing device |
| CN113463093A (en) * | 2021-07-06 | 2021-10-01 | 广西大学 | Device and process method for synthesizing composite coating in situ by using chemical vapor deposition to assist laser cladding |
| CN114250459A (en) * | 2021-12-23 | 2022-03-29 | 浙江工业大学 | Method for supersonic laser deposition micro shot blasting and spraying device |
| CN114573410A (en) * | 2022-03-07 | 2022-06-03 | 沈阳工业大学 | Heating device and method for aluminum-nickel energetic material cold spraying gas and powder |
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| CN112692303A (en) * | 2020-12-14 | 2021-04-23 | 江苏大学 | Device and method for preparing microfluidic 3D printing composite material |
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| CN113463093A (en) * | 2021-07-06 | 2021-10-01 | 广西大学 | Device and process method for synthesizing composite coating in situ by using chemical vapor deposition to assist laser cladding |
| CN114250459A (en) * | 2021-12-23 | 2022-03-29 | 浙江工业大学 | Method for supersonic laser deposition micro shot blasting and spraying device |
| CN114573410A (en) * | 2022-03-07 | 2022-06-03 | 沈阳工业大学 | Heating device and method for aluminum-nickel energetic material cold spraying gas and powder |
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