CN111996435A - High-entropy alloy composite powder and method for reinforcing magnesium alloy through ultrahigh-speed laser cladding - Google Patents
High-entropy alloy composite powder and method for reinforcing magnesium alloy through ultrahigh-speed laser cladding Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C30/00—Alloys containing less than 50% by weight of each constituent
- C22C30/02—Alloys containing less than 50% by weight of each constituent containing copper
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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
- B22F9/00—Making metallic powder or suspensions thereof
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- B22F9/04—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F3/00—Changing the physical structure of non-ferrous metals or alloys by special physical methods, e.g. treatment with neutrons
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- 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
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- C23C24/00—Coating starting from inorganic powder
- C23C24/08—Coating starting from inorganic powder by application of heat or pressure and heat
- C23C24/10—Coating starting from inorganic powder by application of heat or pressure and heat with intermediate formation of a liquid phase in the layer
- C23C24/103—Coating with metallic material, i.e. metals or metal alloys, optionally comprising hard particles, e.g. oxides, carbides or nitrides
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- B22F9/00—Making metallic powder or suspensions thereof
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Abstract
The invention discloses high-entropy alloy composite powder and a method for ultrahigh-speed laser cladding strengthening of magnesium alloy. The high-entropy alloy composite powder comprises nickel powder, chromium powder, cobalt powder, iron powder, copper powder, titanium powder, vanadium powder, aluminum powder and ceramic particles; the mass fraction of the ceramic particles is 10-20% of the high-entropy alloy composite powder. The method for strengthening the magnesium alloy by laser cladding comprises the following steps: (1) setting technological parameters of ultra-high-speed laser cladding; (2) loading the high-entropy alloy composite powder on an ultrahigh-speed laser cladding machine, and enabling the energy of a laser beam to act on the powder material; (3) and (3) delivering the powder to the upper part of the surface of the magnesium alloy to be treated in a synchronous powder delivery mode, melting the high-entropy alloy composite powder into liquid drops which fall into a molten pool on the surface of the magnesium alloy, and forming a cladding layer which is metallurgically bonded with the magnesium alloy matrix after solidification. The invention avoids the excessive melting or overburning of the magnesium alloy, improves the efficiency of magnesium alloy surface treatment, and has the advantages of small deformation and high surface finish.
Description
Technical Field
The invention relates to the technical field of metal surface treatment, in particular to high-entropy alloy composite powder and a method for reinforcing a magnesium alloy by ultrahigh-speed laser cladding.
Background
The magnesium alloy is the lightest metal structural material and has high specific strength, specific rigidity, excellent vibration resistance, impact resistance and cutting processability. At present, magnesium alloy has become an important material in the fields of traffic, electronic communication, national defense and military industry, biomedical treatment and the like, and has become a focus of attention of all countries in the world. However, magnesium is also the most negative potential metal among the practical metals, and the standard potential is-2.34V (relative to a standard hydrogen electrode). When the magnesium alloy contains some metal impurity elements (such as Fe, Ni and the like), electrochemical corrosion is easily caused; exposed in the air, is very easy to be oxidized, and spontaneously forms a layer of loose and porous oxide film without any protection effect on the surface; exposure to humid environments, acidic and neutral media is susceptible to corrosion. Therefore, the magnesium alloy has low surface hardness and poor wear resistance and corrosion resistance, which limits the application of the magnesium alloy.
At present, surface modification of magnesium alloys is generally performed by electroplating, chemical conversion coating, anodic oxidation, thermal spraying, vapor deposition, ion implantation, and the like. Among the surface modification technologies, laser cladding has the advantages that the energy transfer is convenient, and the selective local strengthening can be performed on the surface of a processed workpiece; the energy action is concentrated, the heating time is short, the heat affected zone is small, and the deformation of the processed workpiece is small; the device can be used for processing workpieces with complex surface shapes so as to realize automatic control; compared with the common method, the laser surface modification effect is more obvious, the tissue is fine and compact, the efficiency is higher, and the method is widely applied. However, the traditional laser cladding technology has low efficiency, the cladding rate is 0.5-2 m/min, the dilution rate of the obtained coating is over 10%, the element transition area is wider (30-100 um), and the corrosion resistance of the matrix can be effectively improved only when the coating reaches a certain thickness. The cladding coating has larger surface roughness, can be put into use after being turned and ground, not only increases working hours, but also wastes materials. In addition, because the laser energy in the conventional laser cladding process mainly acts on the surface of the workpiece, and the large heat input exists, cracks and even peeling of the coating can be generated due to the existence of overlarge residues, and the workpiece is easy to deform when large-area laser cladding is performed and cladding is performed on thin-wall or small-size parts.
The ultra-high speed laser cladding technology is better popularized in the aspect of surface treatment of metals such as steel, iron, copper and the like due to the advantages of high efficiency, low dilution rate, high bonding strength and the like. However, since the melting point of the magnesium alloy is low, when the laser beam is focused on the cladding powder, the laser beam is also focused on the magnesium alloy, so that the magnesium alloy is excessively melted, and the deformation of the matrix is serious; and the molten magnesium alloy is mixed with cladding powder to dilute the cladding powder, wherein the dilution rate reaches 10% or more; in order to form a cladding layer meeting the performance requirements, more cladding powder needs to be added, which undoubtedly increases the using amount of the cladding powder, easily causes the waste of the cladding powder, and limits the application of the conventional laser cladding technology to the surface modification of magnesium alloy. Therefore, how to apply the ultra-high-speed laser cladding technology to the surface modification of the magnesium alloy is a technical problem to be solved by the technical personnel in the field.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide high-entropy alloy composite powder, and solves the problem that in the ultra-high-speed laser cladding technology, fused magnesium alloy and cladding powder are mixed to dilute the cladding powder, so that the strength, hardness and wear resistance of the cladding powder are affected.
Furthermore, the invention also provides a method for reinforcing the magnesium alloy by ultrahigh-speed laser cladding, which solves the problem of how to apply the ultrahigh-speed laser cladding technology to the surface modification of the magnesium alloy.
In order to solve the technical problems, the invention adopts the following technical scheme:
the high-entropy alloy composite powder comprises high-entropy alloy powder and ceramic particles, wherein the mass fraction of the ceramic particles is 10% -20% of that of the high-entropy alloy composite powder; the high-entropy alloy powder comprises the following components in parts by mass: 12.5-14.1 parts of nickel powder, 11.1-12.5 parts of chromium powder, 12.6-14.2 parts of cobalt powder, 11.9-13.5 parts of iron powder, 13.6-15.3 parts of copper powder, 10.2-11.6 parts of titanium powder, 10.9-12.3 parts of vanadium powder and 6.5-17.2 parts of aluminum powder.
Further, the high-entropy alloy powder comprises the following components in parts by mass: 12.5-13.3 parts of nickel powder, 11.1-11.8 parts of chromium powder, 12.6-13.4 parts of cobalt powder, 11.9-12.6 parts of iron powder, 13.6-14.4 parts of copper powder, 10.2-10.8 parts of titanium powder, 10.9-11.5 parts of vanadium powder and 12.2-17.2 parts of aluminum powder.
Further, high-entropy alloy powder and ceramic particles are mixed and then ball-milled for 30 hours, and the milled powder is dried for 10 hours at the temperature of 200 ℃ in a drying oven.
Furthermore, the nickel powder, the chromium powder, the cobalt powder, the iron powder, the copper powder, the titanium powder, the vanadium powder and the aluminum powder of the metal powder are simple substance powder with the purity of more than 99.5 percent and the average grain diameter of 25-60 um.
A method for reinforcing magnesium alloy by ultrahigh-speed laser cladding specifically comprises the following steps:
(1) setting technological parameters of ultra-high-speed laser cladding: the laser power is 3.5-3.8 kw, the spot diameter is 0.8-1 mm, the cladding speed is 80-120m/min, and the multi-channel lap-joint rate is 80-90%;
(2) loading the high-entropy alloy composite powder on an ultrahigh-speed laser cladding machine, adjusting laser to focus the laser on the high-entropy alloy composite powder, and adjusting the positions of light spots and powder spots to be fused relative to a magnesium alloy matrix to enable the energy of the laser beam to act on the powder material;
(3) under the protection of high-purity argon atmosphere, the high-entropy alloy composite powder is conveyed to the upper part of the surface of the magnesium alloy to be treated in a synchronous powder conveying mode, so that the high-entropy alloy composite powder is melted into liquid drops which fall into a molten pool on the surface of the magnesium alloy, and a cladding layer which is metallurgically bonded with a magnesium alloy matrix is formed after solidification.
In the step (2), the positions of the light spots and the powder spots relative to the surface to be fused of the magnesium alloy substrate are 0.2-0.5mm apart.
The power of the laser is 3.5-3.8 kw, the diameter of a light spot is 0.8-1 mm, the cladding speed is 80-120m/min, and the multi-channel overlapping rate is 80-90%.
Further, the method also comprises the step of pretreating the surface of the magnesium alloy before the ultra-high-speed laser cladding.
Further, the pretreatment is as follows: cleaning the surface of the magnesium alloy, removing oxide skin on the surface, and ultrasonically cleaning by using an absolute ethyl alcohol solution.
Compared with the prior art, the invention has the following beneficial effects:
1. the high-entropy alloy composite powder provided by the invention is used for surface treatment of magnesium alloy reinforced by ultrahigh-speed laser cladding, and has the advantages of low cladding dilution rate (only 2-4%), thin cladding layer (only 0.1-0.3 mm) and high material utilization rate (more than 90%); the coating prepared by the high-entropy alloy composite powder provided by the invention is metallurgically bonded, has high bonding strength, compact structure and high hardness, high wear resistance and high stability, and the compactness of the coating is almost 100%.
The magnesium alloy has high heating temperature and high cooling speed in the cladding process, can further improve the solid solution limit of the solid solution to cause stronger solid solution strengthening effect, can promote the solidification nucleation rate to be greater than the crystal growth speed, and easily causes the solid solution structure, even the amorphous and nanocrystalline structure, to appear in the cladding layer, thereby leading the surface mechanical property of the processed magnesium alloy to be better.
2. The method for reinforcing the magnesium alloy by ultrahigh-speed laser cladding provided by the invention focuses laser on the high-entropy alloy composite powder, and melts the high-entropy alloy composite powder into liquid drops which fall into a molten pool on the surface of the magnesium alloy. The beam with high energy density is not directly irradiated on the surface of the magnesium alloy, but is irradiated on the surface of the magnesium alloy through the high-entropy alloy composite powder, so that the magnesium alloy is not excessively melted, the processed magnesium alloy has the advantages of small deformation and high surface smoothness, and subsequent machining treatment is not needed. And the molten pool is dropped in the form of liquid drops instead of solid powder particles, so that the dosage of the cladding powder material which needs to be melted is as small as several microns, the dilution rate is only 2% -4%, the thickness of the cladding layer which is metallurgically combined with the substrate is about 0.1-0.3mm, compared with the traditional laser cladding layer, the thickness of the cladding layer needs several hundred microns, the cladding layer is thick, the powder dosage is large, the dosage of the cladding powder is greatly reduced, and the waste of the cladding powder is avoided.
Detailed Description
The present invention will be further described with reference to the following examples.
High-entropy alloy composite powder (mass parts, gram)
| Composition (I) | Example 1 | Example 2 | Example 3 | Example 4 |
| Ni | 12.33 | 11.98 | 10.25 | 10.64 |
| Cr | 10.98 | 10.63 | 9.10 | 9.44 |
| Co | 12.42 | 12.07 | 10.33 | 10.72 |
| Fe | 11.70 | 11.47 | 9.76 | 10.08 |
| Cu | 13.32 | 13.01 | 11.15 | 11.52 |
| Ti | 10.08 | 9.86 | 8.36 | 8.64 |
| V | 10.71 | 10.45 | 8.94 | 9.20 |
| Al | 8.46 | 5.53 | 14.11 | 9.76 |
| W | 9.39 | 14.08 | 16.90 | 18.78 |
| C | 0.61 | 0.92 | 1.10 | 1.22 |
Example 4
Cleaning the surface of the magnesium alloy substrate, wiping the magnesium alloy substrate by using a steel brush, removing surface oxide skin to obtain a rough surface, then putting the treated magnesium alloy substrate into an absolute ethyl alcohol solution for ultrasonic cleaning, removing surface dirt, taking out and drying. The method comprises the following specific steps of ultra-high-speed laser cladding and strengthening of the magnesium alloy:
(1) setting technological parameters of ultra-high-speed laser cladding: the laser power is 3.5kw, the spot diameter is 0.8mm, the cladding speed is 80/min, and the multi-channel lap joint rate is 80%;
(2) loading the cladding powder on an ultrahigh-speed laser cladding machine, and conveying the cladding powder to a position 0.2mm above the surface of the magnesium alloy to be treated in a synchronous powder conveying manner. The cladding powder is prepared according to example 1, metal powder and WC ceramic particles are weighed by balance, and the prepared powder is subjected to ball milling by a planetary ball mill for uniformly mixing raw material powder for 30 hours. The method specifically comprises the following steps: vacuumizing the ball milling tank, introducing argon for protection, carrying out dry milling on the powder for 18 hours, adding alcohol for wet milling for 2 hours, then drying in a vacuum environment, carrying out ball milling for 8 hours, adding alcohol for wet milling for 2 hours, and finally drying at 200 ℃ for 10 hours for later use. The performance of the prepared high-entropy alloy is represented by high strength, high hardness, high wear resistance and high stability.
(3) Under the protection of high-purity argon atmosphere, the cladding powder is irradiated by a beam with high energy density to be melted into cladding liquid drops, and simultaneously the beam with high energy density melts the surface of the magnesium alloy to form a molten pool; and the cladding liquid drops are dropped into a molten pool to be rapidly solidified to form a cladding layer which is metallurgically bonded with the magnesium alloy matrix.
The microhardness value of the high-entropy alloy cladding layer prepared by the embodiment is 990HV, the high-entropy alloy cladding layer is metallurgically bonded, the surface smoothness is high, the stability is good, the tissue structure is compact, and the density is 100%.
Example 5
Cleaning the surface of the magnesium alloy substrate, wiping the magnesium alloy substrate by using a steel brush, removing surface oxide skin to obtain a rough surface, then putting the treated magnesium alloy substrate into an absolute ethyl alcohol solution for ultrasonic cleaning, removing surface dirt, taking out and drying. The method comprises the following specific steps of ultra-high-speed laser cladding and strengthening of the magnesium alloy:
(1) setting technological parameters of ultra-high-speed laser cladding: the laser power is 3.6kw, the spot diameter is 0.9mm, the cladding speed is 120m/min, and the multi-channel lap joint rate is 86%;
(2) loading the cladding powder on an ultrahigh-speed laser cladding machine, and conveying the cladding powder to a position 0.5mm above the surface of the magnesium alloy to be treated in a synchronous powder conveying manner. The cladding powder is prepared according to the example 2, metal powder and WC ceramic particles are weighed by balance, and the prepared powder is subjected to ball milling by a planetary ball mill for uniformly mixing raw material powder for 30 hours. The method specifically comprises the following steps: vacuumizing the ball milling tank, introducing argon for protection, carrying out dry milling on the powder for 18 hours, adding alcohol for wet milling for 2 hours, then drying in a vacuum environment, carrying out ball milling for 8 hours, adding alcohol for wet milling for 2 hours, and finally drying at 200 ℃ for 10 hours for later use. The performance of the prepared high-entropy alloy is represented by high strength, high hardness, high wear resistance and high stability.
(3) Under the protection of high-purity argon atmosphere, the cladding powder is irradiated by a beam with high energy density to be melted into cladding liquid drops, and simultaneously the beam with high energy density melts the surface of the magnesium alloy to form a molten pool; and the cladding liquid drops are dropped into a molten pool to be rapidly solidified to form a cladding layer which is metallurgically bonded with the magnesium alloy matrix.
The microhardness value of the high-entropy alloy cladding layer prepared by the embodiment is 975HV, the high-entropy alloy cladding layer is in metallurgical bonding, the surface smoothness is high, the stability is good, the tissue structure is compact, and the density is 99.8%.
Example 6
Cleaning the surface of the magnesium alloy substrate, wiping the magnesium alloy substrate by using a steel brush, removing surface oxide skin to obtain a rough surface, then putting the treated magnesium alloy substrate into an absolute ethyl alcohol solution for ultrasonic cleaning, removing surface dirt, taking out and drying. The method comprises the following specific steps of ultra-high-speed laser cladding and strengthening of the magnesium alloy:
(1) setting technological parameters of ultra-high-speed laser cladding: the laser power is 3.8kw, the spot diameter is 0.8mm, the cladding speed is 90m/min, and the multi-channel overlapping rate is 90%;
(2) loading the cladding powder on an ultrahigh-speed laser cladding machine, and conveying the cladding powder to a position 0.2mm above the surface of the magnesium alloy to be treated in a synchronous powder conveying manner. The cladding powder is prepared according to the example 3, metal powder and WC ceramic particles are weighed by balance, and the prepared powder is subjected to ball milling by a planetary ball mill for uniformly mixing raw material powder for 30 hours. The method specifically comprises the following steps: vacuumizing the ball milling tank, introducing argon for protection, carrying out dry milling on the powder for 18 hours, adding alcohol for wet milling for 2 hours, then drying in a vacuum environment, carrying out ball milling for 8 hours, adding alcohol for wet milling for 2 hours, and finally drying at 200 ℃ for 10 hours for later use. The performance of the prepared high-entropy alloy is represented by high strength, high hardness, high wear resistance and high stability.
(3) Under the protection of high-purity argon atmosphere, the cladding powder is irradiated by a beam with high energy density to be melted into cladding liquid drops, and simultaneously the beam with high energy density melts the surface of the magnesium alloy to form a molten pool; and the cladding liquid drops are dropped into a molten pool to be rapidly solidified to form a cladding layer which is metallurgically bonded with the magnesium alloy matrix.
The microhardness value of the high-entropy alloy cladding layer prepared by the embodiment is 1010HV, the high-entropy alloy cladding layer is in metallurgical bonding, the surface smoothness is high, the stability is good, the tissue structure is compact, and the density is 100%.
Example 7
Cleaning the surface of the magnesium alloy substrate, wiping the magnesium alloy substrate by using a steel brush, removing surface oxide skin to obtain a rough surface, then putting the treated magnesium alloy substrate into an absolute ethyl alcohol solution for ultrasonic cleaning, removing surface dirt, taking out and drying. The method comprises the following specific steps of ultra-high-speed laser cladding and strengthening of the magnesium alloy:
(1) setting technological parameters of ultra-high-speed laser cladding: the laser power is 3.8kw, the spot diameter is 1mm, the cladding speed is 100m/min, and the multi-channel lap joint rate is 83%;
(2) loading the cladding powder on an ultrahigh-speed laser cladding machine, and conveying the cladding powder to a position 0.5mm above the surface of the magnesium alloy to be treated in a synchronous powder conveying manner. The cladding powder is prepared according to the example 4, metal powder and WC ceramic particles are weighed by balance, and the prepared powder is subjected to ball milling by a planetary ball mill, so that the raw material powder is uniformly mixed, and the ball milling time is 30 hours. The method specifically comprises the following steps: vacuumizing the ball milling tank, introducing argon for protection, carrying out dry milling on the powder for 18 hours, adding alcohol for wet milling for 2 hours, then drying in a vacuum environment, carrying out ball milling for 8 hours, adding alcohol for wet milling for 2 hours, and finally drying at 200 ℃ for 10 hours for later use. The performance of the prepared high-entropy alloy is represented by high strength, high hardness, high wear resistance and high stability.
(3) Under the protection of high-purity argon atmosphere, the cladding powder is irradiated by a beam with high energy density to be melted into cladding liquid drops, and simultaneously the beam with high energy density melts the surface of the magnesium alloy to form a molten pool; and the cladding liquid drops are dropped into a molten pool to be rapidly solidified to form a cladding layer which is metallurgically bonded with the magnesium alloy matrix.
The microhardness value of the high-entropy alloy cladding layer prepared by the embodiment is 995HV, the high-entropy alloy cladding layer is in metallurgical bonding, the surface smoothness is high, the stability is good, the tissue structure is compact, and the density is 99.9%.
In conclusion, by adopting the high-entropy alloy composite powder and the ultrahigh-speed laser cladding reinforced magnesium alloy, the beam with high energy density melts the high-entropy alloy composite powder above the magnesium alloy substrate and falls into a molten pool in a droplet form, the cladding speed is greatly improved and can reach 50-200 m/min, compared with the traditional laser cladding technology, the coating speed is improved by at least 100 times, the high-energy accumulation on the substrate is reduced, the heat affected zone is reduced by 100 times, meanwhile, the cladding dilution rate is low (only 2-4%), the cladding layer is thin (only 0.1-0.3 mm), and the material utilization rate is high (more than 90%); the prepared coating has high bonding strength, is metallurgical bonding, has high surface smoothness, compact organizational structure and coating density of almost 100 percent, belongs to the remanufacturing and processing technology of advanced manufacturing, additive manufacturing and green manufacturing, can greatly reduce the subsequent machining cost of enterprises in the field of industrial remanufacturing, can effectively prolong the service life of products, and saves a large amount of later maintenance cost for the enterprises. Finally, the technological characteristics of wear resistance, corrosion resistance, heat resistance, oxidation resistance and the like of the surface of the magnesium alloy matrix are obviously improved.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting the technical solutions, and those skilled in the art should understand that modifications or equivalent substitutions can be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all that should be covered by the claims of the present invention.
Claims (9)
1. The high-entropy alloy composite powder is characterized by comprising high-entropy alloy powder and ceramic particles, wherein the mass fraction of the ceramic particles is 10-20% of that of the high-entropy alloy composite powder; the high-entropy alloy powder comprises the following components in parts by mass: 12.5-14.1 parts of nickel powder, 11.1-12.5 parts of chromium powder, 12.6-14.2 parts of cobalt powder, 11.9-13.5 parts of iron powder, 13.6-15.3 parts of copper powder, 10.2-11.6 parts of titanium powder, 10.9-12.3 parts of vanadium powder and 6.5-17.2 parts of aluminum powder.
2. A high entropy alloy composite powder according to claim 1, wherein the high entropy alloy powder is, in parts by mass: 12.5-13.3 parts of nickel powder, 11.1-11.8 parts of chromium powder, 12.6-13.4 parts of cobalt powder, 11.9-12.6 parts of iron powder, 13.6-14.4 parts of copper powder, 10.2-10.8 parts of titanium powder, 10.9-11.5 parts of vanadium powder and 12.2-17.2 parts of aluminum powder.
3. A high-entropy alloy composite powder according to claim 1 or 2, wherein the high-entropy alloy powder and the ceramic particles are mixed and then ball-milled for 30 hours, and the milled powder is dried in a drying oven at a temperature of 200 ℃ for 10 hours.
4. A high-entropy alloy composite powder according to claim 1, wherein the nickel powder, chromium powder, cobalt powder, iron powder, copper powder, titanium powder, vanadium powder, and aluminum powder of the metal powder are elemental powders having a purity of more than 99.5% and an average particle diameter of 25-60 μm.
5. A method for ultrahigh-speed laser cladding strengthening of magnesium alloy is characterized in that the high-entropy alloy composite powder as claimed in any one of claims 1 to 4 is adopted, and the method specifically comprises the following steps:
(1) setting technological parameters of ultra-high-speed laser cladding: the laser power is 3.5-3.8 kw, the spot diameter is 0.8-1 mm, the cladding speed is 80-120m/min, and the multi-channel lap-joint rate is 80-90%;
(2) loading the high-entropy alloy composite powder on an ultrahigh-speed laser cladding machine, adjusting laser to focus the laser on the high-entropy alloy composite powder, and adjusting the positions of light spots and powder spots to be fused relative to a magnesium alloy matrix to enable the energy of the laser beam to act on the powder material;
(3) under the protection of high-purity argon atmosphere, the high-entropy alloy composite powder is conveyed to the upper part of the surface of the magnesium alloy to be treated in a synchronous powder conveying mode, so that the high-entropy alloy composite powder is melted into liquid drops which fall into a molten pool on the surface of the magnesium alloy, and a cladding layer which is metallurgically bonded with a magnesium alloy matrix is formed after solidification.
6. The method for ultrahigh-speed laser cladding strengthening of magnesium alloy according to claim 5, wherein in the step (2), the position of the light spot and the powder spot is 0.2-0.5mm away from the surface to be clad of the magnesium alloy substrate.
7. The method for ultrahigh-speed laser cladding strengthening of the magnesium alloy as claimed in claim 5, wherein the power of the laser is 3.5kw-3.8kw, the spot diameter is 0.8mm-1mm, the cladding speed is 80-120m/min, and the multi-pass lap ratio is 80% -90%.
8. The method for ultra-high speed laser cladding reinforced magnesium alloy according to claim 5, further comprising the step of pre-treating the surface of the magnesium alloy before ultra-high speed laser cladding.
9. The method for ultra-high speed laser cladding reinforced magnesium alloy according to claim 8, wherein the pretreatment is: cleaning the surface of the magnesium alloy, removing oxide skin on the surface, and ultrasonically cleaning by using an absolute ethyl alcohol solution.
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| CN113333775A (en) * | 2021-05-17 | 2021-09-03 | 武汉大学 | Transparent liquid drop reinforced composite additive manufacturing method |
| CN113445041A (en) * | 2021-07-15 | 2021-09-28 | 山东理工大学 | Preparation method of low-cost light high-entropy alloy/aluminum oxide composite coating on surface of magnesium alloy |
| CN113634764A (en) * | 2021-07-26 | 2021-11-12 | 太原理工大学 | Method for manufacturing stainless steel-based composite coating on surface of magnesium alloy through laser additive manufacturing |
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| CN115178734A (en) * | 2022-05-16 | 2022-10-14 | 广州大学 | Granular double/multi-metal composite material and preparation method thereof |
| CN115161637A (en) * | 2022-08-03 | 2022-10-11 | 天津大学 | Wear-resistant and corrosion-resistant coating on surface of piston rod and preparation method thereof |
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