CN113174525A - High-entropy alloy powder and preparation and application thereof - Google Patents
High-entropy alloy powder and preparation and application thereof Download PDFInfo
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- 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
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- 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
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/06—Metallic powder characterised by the shape of the particles
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- B22—CASTING; POWDER METALLURGY
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- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- 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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- 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
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- C22C1/02—Making non-ferrous alloys by melting
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- 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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- C23C24/08—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
- C23C24/106—Coating with metal alloys or metal elements only
Abstract
The invention relates to high-entropy alloy powder and preparation and application thereof, and aims to solve the technical problem that the existing laser cladding layer of iron is insufficient in corrosion resistance. The high-entropy alloy consists of Al and Fe, Co, Ni and C with equal atomic ratio, wherein the ratio of Fe, Co, Ni and Cr is 21.70-21.80%; the high-entropy alloy ingot prepared by the non-vacuum consumable electric arc furnace is subjected to powder preparation by a gas atomization method, and then the powder is synchronously fed and laser cladding is carried out to obtain a cladding layer. In the invention, the segregation and even combination of the high mixed entropy inhibiting elements of the high entropy alloy promote the formation of the solid solution with a single FCC structure, the high-temperature hardness is basically kept unchanged, and the high-entropy alloy has good corrosion resistance.
Description
Technical Field
The invention relates to the technical field of material surface modification, in particular to high-entropy alloy powder and preparation and application thereof.
Background
High entropy alloy (A)High-entropy alloysHEA) refers to a multicomponent alloy system consisting of 5-13 elements, each element having an atomic percent between 5% and 35%. The development of the high-entropy alloy provides a new thought and a new development direction for the field of metal materials, provides a theoretical basis for breaking through the performance limit of the traditional materials, obtains a large amount of valuable achievements, and is one of the hot spots of the research of the direction of the metal materials at present.
The high-entropy alloy can form a unique multi-component solid solution phase, has larger lattice distortion and the like, and has excellent mechanical properties, physical and chemical properties and the like such as high strength, high hardness, good ductility and tensile properties, corrosion resistance, thermal stability and the like compared with the traditional alloy. At present, the research on high-entropy alloy mainly focuses on vacuum arc melting and casting block materials, which causes the preparation size to be greatly limited; and most of the metals used for preparation are expensive, so that the cost for producing large parts is too high.
Laser cladding (Laser Cladding）Also known as laser cladding or laser cladding, is a new surface modification technique; the method is characterized in that a cladding material is added on the surface of a base material, and the cladding material and a thin layer on the surface of the base material are fused together by utilizing a laser beam with high energy density, so that a metallurgically bonded cladding layer is formed on the surface of a base layer. The high-entropy alloy is used as a laser cladding coating material, is applied to the technical field of surface modification of steel (such as Q235, 45 steel, AISI 4140 steel, 42CrMo steel and the like), can play a role in protection or form special physical and chemical properties, and further expands the application field of the high-entropy alloy material. For example, patent document CN110804711A discloses a high-entropy alloy powder and a method for preparing a laser cladding layer, wherein the formed laser cladding layer has a stable phase structure, unchanged high-temperature hardness, and good high-temperature softening resistance. But it is still difficult to be applied to the application fields with higher requirements on corrosion resistance, such as underground coal mining equipment hydraulic supports, drill rods and drilling wells, and boiler walls, ship decks, petroleum pipes, impeller repair, engine manufacture and remanufacture, etc.
Disclosure of Invention
The invention provides high-entropy alloy powder and a preparation method thereof, aiming at solving the technical problem that a corrosion-resistant coating is difficult to form.
On the other hand, the steel surface modification method is provided, aiming at solving the technical problem that the surface coating of the existing steel base material (such as Q235, 45 steel, AISI 4140 steel, 42CrMo steel and the like) has insufficient corrosion resistance.
By changing the element components and contents in the high-entropy alloy system, the structure of the high-entropy alloy can be changed (such as single solid solution formation), element segregation can be generated, and the corrosion resistance of the material can be further changed. Intensive research shows that a dense and stable passivation film with a protection effect can be formed on the surface of the alloy by adjusting and adding easy-to-passivate elements such as Co, Cr, Ni, Al and the like so as to improve the corrosion resistance. Based on this, the invention adopts the following technical scheme:
the high-entropy alloy is designed to be composed of Fe, Co, Ni, C and Al in atomic percentage, wherein the ratio of Fe, Co, Ni and Cr is 21.70-21.80%, and the balance is Al.
The preparation method of the high-entropy alloy comprises the following steps:
(1) respectively purifying the surfaces of Fe, Co, Ni, Cr and Al raw materials to remove oxides;
(2) weighing and proportioning Fe, Co, Ni, Cr and Al raw materials according to the atomic ratio of claim 1;
(3) placing the prepared raw materials in a water-cooled copper mold in a vacuum non-consumable arc furnace, and adjusting the vacuum degree to be (4-6) x 10-3Pa; then filling argon as protective gas into the cavity until the indication of a pressure gauge is-0.04 to-0.06 Mpa, and starting smelting;
(4) and (3) repeatedly smelting for 2-5 times, keeping the arc for 40-60s after the alloy is melted every time, turning the alloy after the alloy is cooled, and taking out the alloy after the alloy is uniformly smelted for 8-12 minutes to obtain the high-entropy alloy.
The high-entropy alloy powder is prepared from the high-entropy alloy through a grinding method or an air atomization method, and the grain size of the alloy powder is 200-400 meshes.
A preparation method of high-entropy alloy powder comprises the following steps:
remelting the high-entropy alloy, conveying the molten liquid metal into a vacuum gas atomization furnace, impact-atomizing the liquid metal by high-speed inert gas flow, and quickly solidifying the liquid metal into powder. Argon can be used as atomizing gas, and the atomizing pressure is 8-10 MPa.
The high-entropy alloy powder is applied to preparing a laser cladding coating or modifying the surface of steel.
A steel surface modification method comprises the following steps:
(1) pretreating to remove impurities on the surface of the steel base material;
(2) in the argon protection atmosphere, the high-entropy alloy powder in the claim 3 is laser-cladded on the surface of a steel substrate by a synchronous powder feeding laser to form a high-entropy alloy coating, and the process parameters are as follows: the laser power is 1100 w-1200 w, the diameter of a light spot is 3.0-4.0 mm, the scanning speed is 5-6 mm/s, the defocusing amount is 15-18 mm, and the flow of argon is 4-6L/min.
Compared with the prior art, the invention has the main beneficial technical effects that:
1. the high-entropy alloy cladding layer formed by laser cladding of the high-entropy alloy has uniform structure and stable structure, is well metallurgically bonded with a matrix, has high hardness and high corrosion resistance, has good macroscopic morphology, has no defects of cracks, pores and the like, and has obviously improved performance compared with a base material.
2. The high mixed entropy of the high entropy alloy of the invention inhibits the segregation and even combination of elements, promotes the formation of solid solution with a single FCC structure, basically keeps the high temperature hardness unchanged, and has good corrosion resistance.
3. The invention utilizes high-speed airflow to crush liquid metal flow into small liquid drops in the vacuum gas atomization furnace and quickly solidify the small liquid drops into high-entropy alloy powder, and has the advantages of high purity, low oxygen content, controllable powder granularity, low production cost, high sphericity and the like.
Drawings
FIG. 1 is a representation of FeCoNiCrAl prepared in accordance with the present invention0.6SEM image of high-entropy alloy powder particles.
Fig. 2 is an XRD diffractogram of the alloy coating after laser cladding of examples 1, 2, 3, 4.
FIG. 3 is a representation of FeCoNiCrAl in example 10.6Dynamic polarization curve of high-entropy alloy coating and matrix Q235 steel.
FIG. 4 is FeCoNiCrAl as in example 10.6And (3) SEM topography and line scanning analysis results of the high-entropy alloy coating.
Detailed Description
The following examples are intended to illustrate the present invention in detail and should not be construed as limiting the scope of the present invention in any way.
The instruments and devices referred to in the following examples are conventional instruments and devices unless otherwise specified; the industrial raw materials are all conventional industrial raw materials which are sold on the market if not specifically indicated; the processing and manufacturing methods are conventional methods unless otherwise specified.
The chemical composition of the base material Q235 steel referred to in the following examples is shown in table 1 below.
TABLE 1 chemical composition of Q235 steel
| Element(s) | C | Mn | Si | S | P | Fe |
| Mass percent% | 0.12～0.22 | 0.3～0.8 | 0.3≤ | 0.45≤ | 0.45≤ | Bal. |
Example 1: preparation and application of high-entropy alloy powder
The high-entropy alloy of the embodiment is composed of Fe, Co, Ni, Cr and Al, wherein the atomic ratio of each component is 13.04% of Al and 21.74% of Fe, Co, Ni and Cr.
The Q235 steel surface modification method comprises the following steps:
(1) alloy smelting by adopting a non-consumable vacuum arc furnace: placing the raw materials in proportion in a water-cooled copper mold in a vacuum non-consumable arc furnace, wherein the vacuum degree is 5 multiplied by 10-3Pa; then filling argon as protective gas into the cavity until the indication of the pressure gauge is-0.05 Mpa; in the smelting process, after alloying each time, keeping the electric arc for 50s, turning the alloy over after the alloy is cooled, and repeating the process for 4 times; and after the alloy is uniformly smelted, taking out the alloy for about 10 minutes to obtain the high-entropy alloy.
(2) Remelting the high-entropy alloy block prepared in the step (1) in an induction crucible, conveying liquid metal to the tip of an atomizing nozzle through a hole with the diameter of 1 mm in the center, crushing the liquid metal into small droplets by high-speed airflow, and rapidly solidifying the small droplets into powder, wherein in order to prevent the oxidation of the liquid metal, argon is used as atomizing gas, and the atomizing pressure is 8MPa, so that the alloy powder is obtained, and the particle size is 200-400 meshes.
(3) Performing multi-channel laser cladding on the surface of the Q235 steel substrate subjected to purification pretreatment by using the powder obtained in the step (2) through a synchronous powder feeding laser, wherein the process parameters are as follows: the laser power is 1100w, the scanning speed is 5mm/s, the spot diameter is 3.5mm, the defocusing amount is 17mm, the protective gas adopts argon, and the gas flow is 5L/min.
In the coating obtained after laser cladding, the cross section of the cladding layer is subjected to metallographic polishing to obtain an SEM image, and as shown in FIGS. 1 and 4, the coating is well metallurgically bonded with the substrate; the XRD diffraction pattern of the alloy coating is shown in figure 2; an HV-1000A type micro Vickers hardness meter is adopted to measure the microhardness of the cladding layer, wherein five values are measured at different positions of the cladding layer and the base material respectively, and an average value is taken after the maximum value and the minimum value are removed, the experimental result shows that the average value after laser cladding reaches 288.5HV, and the microhardness is obviously improved compared with the base material, and is specifically shown in the following table 2.
TABLE 2 hardness index comparison
Measuring the potentiodynamic polarization curve of the high-entropy alloy coating in 3.5 wt.% NaCl electrolyte by using a CHI-660E electrochemical workstation, obtaining corrosion potential and corrosion current value by utilizing the extrapolation of a cathode Tafel curve and the intersection of the corrosion potential, and displaying the detection result (shown in figure 3) that the self-corrosion potential, the self-corrosion current and the pitting potential of the cladding layer are respectively 4.21 multiplied by 10-7A/cm20.307V and 0.265V, the corrosion resistance is obviously improved compared with the base body, and the corrosion resistance is not much different from that of 304 stainless steel.
Example 2: preparation and application of high-entropy alloy powder
The Q235 steel surface modification method comprises the following steps:
the high-entropy alloy block of the embodiment is composed of Fe, Co, Ni, Cr and Al, and the atomic ratio of each component is 13.04% of Al and 21.74% of Fe, Co, Ni and Cr.
(1) Alloy smelting by adopting a non-consumable vacuum arc furnace: placing the prepared raw materials in a water-cooled copper mold in a vacuum non-consumable arc furnace, wherein the vacuum degree is 5 multiplied by 10-3Pa; then filling argon as protective gas into the cavity until the indication of the pressure gauge is-0.05 Mpa; in the smelting process, after alloying each time, keeping the electric arc for 40-60s, turning the alloy over after the alloy is cooled, and repeating the process for 3 times; and after the alloy is uniformly smelted, taking out the alloy for about 10 minutes to obtain the high-entropy alloy.
(2) Remelting the high-entropy alloy block prepared in the step (1) in an induction crucible, conveying liquid metal to the tip of an atomizing nozzle through a hole with the diameter of 1 mm in the center, crushing the liquid metal into small droplets by high-speed airflow, and quickly solidifying the small droplets into powder, wherein in order to prevent the liquid metal from being oxidized, argon is used as atomizing gas, and the atomizing pressure is 8 MPa. The alloy powder is obtained, and the particle size is 200-400 meshes.
(3) Performing multi-channel laser cladding on the surface of Q235 steel on the powder obtained in the step (2) by a synchronous powder feeding laser, wherein the process parameters are as follows: the laser power is 1100w, the scanning speed is 6mm/s, the diameter of a light spot is 3.5mm, the defocusing amount is 17mm, the protective gas adopts argon, and the gas flow is 4L/min.
In the coating obtained after laser cladding, the cross section of the cladding layer is subjected to metallographic polishing, and the coating and the matrix are well combined metallurgically with the same result; the XRD diffraction pattern of the alloy coating is shown in figure 2; an HV-1000A type micro Vickers hardness meter is adopted to measure the microhardness of the cladding layer, wherein five values are measured at different positions of the cladding layer and the base material respectively, and an average value is taken after the maximum value and the minimum value are removed, the experimental result shows that the average value after laser cladding reaches 387.8HV, and the microhardness is obviously improved compared with the base material, and is specifically shown in Table 3.
TABLE 3 hardness index comparison
| Serial number | 1 | 2 | 3 | 4 | 5 | Mean value (HV) |
| Q235 | 127.8 | 126.9 | 137.9 | 131.5 | 125.7 | 130 |
| Cladding layer | 380.4 | 376.6 | 387.7 | 397.4 | 397 | 387.8 |
The zeta potential polarization curve of the high-entropy alloy coating in 3.5 wt.% NaCl electrolyte is measured by adopting a CHI-660E electrochemical workstation, the corrosion potential and the corrosion current value are obtained by utilizing the extrapolation of a cathode Tafel curve to intersect with the corrosion potential, and the experimental result shows that the self-corrosion potential, the self-corrosion current and the pitting potential of the cladding layer are respectively 2.85 multiplied by 10-7A/cm20.306V and 0.353V, the corrosion resistance is obviously improved compared with that of the matrix, and the corrosion resistance is not much different from that of 304 stainless steel.
Example 3
The high-entropy alloy block of the embodiment is composed of Fe, Co, Ni, Cr and Al, and the atomic ratio of each component is 13.04% of Al and 21.74% of Fe, Co, Ni and Cr.
The preparation method of the high-entropy alloy material coating comprises the following steps:
(1) alloy smelting by adopting a non-consumable vacuum arc furnace: placing the prepared raw materials in a water-cooled copper mold in a vacuum non-consumable arc furnace, wherein the vacuum degree is 5 multiplied by 10-3Pa; then filling argon as protective gas into the cavity until the indication of the pressure gauge is-0.05 Mpa; in the smelting process, after alloying each time, keeping the electric arc for 60s, turning the alloy over after the alloy is cooled, and repeating the process for 5 times; and after the alloy is uniformly smelted, taking out the alloy for about 10 minutes to obtain the high-entropy alloy.
(2) Remelting the high-entropy alloy block prepared in the step (1) in an induction crucible, conveying liquid metal to the tip of an atomizing nozzle through a hole with the diameter of 1 mm in the center, crushing the liquid metal into small droplets by high-speed airflow, and rapidly solidifying the small droplets into powder, wherein in order to prevent the oxidation of the liquid metal, argon is used as atomizing gas, and the atomizing pressure is 8MPa, so that the alloy powder is obtained, and the particle size is 200-400 meshes.
(3) Performing multi-channel laser cladding on the surface of Q235 steel on the powder obtained in the step (2) by a synchronous powder feeding laser, wherein the process parameters are as follows: the laser power is 1200w, the scanning speed is 5mm/s, the spot diameter is 3.5mm, the defocusing amount is 17mm, the protective gas adopts argon, and the gas flow is 6L/min.
In the coating obtained after laser cladding, the cross section of the cladding layer is subjected to metallographic polishing, and the coating and the matrix are well combined metallurgically with the same result; the XRD diffraction pattern of the alloy coating is shown in figure 2; an HV-1000A type micro Vickers hardness meter is adopted to measure the microhardness of the cladding layer, wherein five values are measured at different positions of the cladding layer and the base material respectively, and an average value is taken after the maximum value and the minimum value are removed, the experimental result shows that the average value after laser cladding reaches 284.2HV, which is obviously improved compared with the base material, and is specifically shown in Table 4.
TABLE 4 hardness index comparison
| Serial number | 1 | 2 | 3 | 4 | 5 | Mean value (HV) |
| Q235 | 151 | 137.6 | 146.5 | 142 | 148.9 | 145.2 |
| Cladding layer | 286.9 | 288.8 | 283.4 | 283.5 | 278.2 | 284.2 |
The zeta potential polarization curve of the high-entropy alloy coating in 3.5 wt.% NaCl electrolyte is measured by adopting a CHI-660E electrochemical workstation, the corrosion potential and the corrosion current value are obtained by utilizing the extrapolation of a cathode Tafel curve to intersect with the corrosion potential, and the experimental result shows that the self-corrosion potential, the self-corrosion current and the pitting potential of the cladding layer are respectively 5.13 multiplied by 10-7A/cm20.336V and 0.403V, the corrosion resistance is obviously improved compared with the matrix, and the corrosion resistance is not much different from that of 304 stainless steel.
Example 4
The high-entropy alloy block of the embodiment is composed of Fe, Co, Ni, Cr and Al, and the atomic ratio of each component is 13.04% of Al and 21.74% of Fe, Co, Ni and Cr.
The preparation method of the high-entropy alloy material coating comprises the following steps:
(1) alloy smelting by adopting a non-consumable vacuum arc furnace: placing the prepared raw materials in a water-cooled copper mold in a vacuum non-consumable arc furnace, wherein the vacuum degree is 5 multiplied by 10-3Pa; then filling argon as protective gas into the cavity until the indication of the pressure gauge is-0.05 Mpa; in the smelting process, after alloying each time, keeping the electric arc for 40-60s, turning the alloy over after the alloy is cooled, and repeating the process for 4 times; and after the alloy is uniformly smelted, taking out the alloy for about 10 minutes to obtain the high-entropy alloy.
(2) Remelting the high-entropy alloy block prepared in the step (1) in an induction crucible, conveying liquid metal to the tip of an atomizing nozzle through a hole with the diameter of 1 mm in the center, crushing the liquid metal into small droplets by high-speed airflow, and quickly solidifying the small droplets into powder, wherein in order to prevent the liquid metal from being oxidized, argon is used as atomizing gas, and the atomizing pressure is 8 MPa. The alloy powder is obtained, and the particle size is 200-400 meshes.
(3) Performing multi-channel laser cladding on the surface of Q235 steel on the powder obtained in the step (2) by a synchronous powder feeding laser, wherein the process parameters are as follows: the laser power is 1200w, the scanning speed is 6mm/s, the diameter of a light spot is 3.5mm, the defocusing amount is 17mm, the protective gas adopts argon, and the gas flow is 5L/min.
The coating obtained after laser cladding of the embodiment has the same result, and the metallurgical bonding between the coating and the matrix is good; the XRD diffraction pattern of the alloy coating is shown in figure 2; an HV-1000A type micro Vickers hardness meter is adopted to measure the microhardness of the cladding layer, wherein five values are measured at different positions of the cladding layer and the base material respectively, and an average value is taken after the maximum value and the minimum value are removed, the experimental result shows that the average value after laser cladding reaches 330.2HV, which is obviously improved compared with the base material, and the specific value is shown in the following table.
TABLE 5 hardness index comparison
| Serial number | 1 | 2 | 3 | 4 | 5 | Mean value (HV) |
| Q235 | 140.6 | 145.8 | 141 | 152.6 | 155 | 147 |
| Cladding layer | 324.5 | 331.2 | 326.7 | 331 | 337.8 | 330.2 |
The zeta potential polarization curve of the high-entropy alloy coating in 3.5 wt.% NaCl electrolyte is measured by adopting a CHI-660E electrochemical workstation, the corrosion potential and the corrosion current value are obtained by utilizing the extrapolation of a cathode Tafel curve to intersect with the corrosion potential, and the experimental result shows that the self-corrosion potential, the self-corrosion current and the pitting potential of the cladding layer are respectively 5.24 multiplied by 10-7A/cm20.318V and 0.281V, the corrosion resistance is obviously improved compared with the matrix, and the corrosion resistance is not much different from that of 304 stainless steel.
While the invention has been described in detail with reference to the drawings and examples, it will be understood by those skilled in the art that various changes in the specific parameters of the embodiments described above may be made or equivalents of related methods, steps and materials may be substituted without departing from the spirit of the invention to form multiple embodiments, which are common variations of the invention and will not be described in detail herein.
Claims (7)
1. The high-entropy alloy consists of Al and Fe, Co, Ni and Cr with equal atomic ratio in atomic percentage, wherein the ratio of Fe, Co, Ni and Cr is 21.70-21.80%, and the balance is Al.
2. The method for preparing the high-entropy alloy of claim 1, comprising the steps of:
(1) respectively purifying the surfaces of Fe, Co, Ni, Cr and Al raw materials to remove oxides;
(2) weighing and proportioning Fe, Co, Ni, Cr and Al raw materials according to the atomic ratio of claim 1;
(3) placing the prepared raw materials in a water-cooled copper mold in a vacuum non-consumable arc furnace, and adjusting the vacuum degree to be (4-6) x 10-3Pa; then filling argon as protective gas into the cavity until the indication of a pressure gauge is-0.04 to-0.06 Mpa, and starting smelting;
(4) and (3) repeatedly smelting for 2-5 times, keeping the arc for 40-60s after the alloy is melted every time, turning the alloy after the alloy is cooled, and taking out the alloy after the alloy is uniformly smelted for 8-12 minutes to obtain the high-entropy alloy.
3. A high-entropy alloy powder, which is prepared from the high-entropy alloy of claim 1 by a grinding method or an air atomization method, and has a particle size of 200-400 meshes.
4. A preparation method of high-entropy alloy powder comprises the following steps:
remelting the high entropy alloy of claim 1 or 2, and transporting the molten liquid metal into a vacuum gas atomization furnace, wherein the liquid metal is impact atomized and rapidly solidified into powder by high velocity inert gas flow.
5. A preparation method of a high-entropy alloy powder according to claim 4, wherein argon is used as an atomizing gas, and the atomizing pressure is 8-10 MPa.
6. The use of the high-entropy alloy powder of claim 1 in the preparation of laser cladding coatings or steel surface modification.
7. A steel surface modification method comprises the following steps:
(1) pretreating to remove impurities on the surface of the steel base material;
(2) in the argon protection atmosphere, the high-entropy alloy powder in the claim 3 is laser-cladded on the surface of a steel substrate by a synchronous powder feeding laser to form a high-entropy alloy coating, and the process parameters are as follows: the laser power is 1100 w-1200 w, the diameter of a light spot is 3.0-4.0 mm, the scanning speed is 5-6 mm/s, the defocusing amount is 15-18 mm, and the flow of argon is 4-6L/min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114951696A (en) * | 2022-05-10 | 2022-08-30 | 哈尔滨工业大学 | Method for manufacturing FeCrTiV on surface of ferrite/martensite steel by laser additive manufacturing 0.5 Ni 0.5 High entropy alloy coatings and methods |
| CN115011855A (en) * | 2022-05-11 | 2022-09-06 | 哈尔滨工程大学 | Self-epitaxial functionalized high-entropy alloy coating with external-strength and internal-toughness gradient structure and preparation method thereof |
| CN115449790A (en) * | 2022-10-14 | 2022-12-09 | 长沙理工大学 | Wear-resistant corrosion-resistant high-entropy alloy cladding layer for propeller remanufacturing and preparation method |
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| CN109402484A (en) * | 2019-01-02 | 2019-03-01 | 中国科学院兰州化学物理研究所 | A kind of preparation method of equiax crystal and nanometer precipitation coupling AlxCoCrFeNi high-entropy alloy |
| CN109913673A (en) * | 2019-03-13 | 2019-06-21 | 湘潭大学 | The high-entropy alloy and preparation method thereof of resistance to aluminum melting corrosion |
| CN110172628A (en) * | 2019-04-18 | 2019-08-27 | 中北大学 | A kind of preparation method of the good aluminium ferro-cobalt nickel chromium triangle high-entropy alloy of corrosion resistance |
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| CN114951696A (en) * | 2022-05-10 | 2022-08-30 | 哈尔滨工业大学 | Method for manufacturing FeCrTiV on surface of ferrite/martensite steel by laser additive manufacturing 0.5 Ni 0.5 High entropy alloy coatings and methods |
| CN115011855A (en) * | 2022-05-11 | 2022-09-06 | 哈尔滨工程大学 | Self-epitaxial functionalized high-entropy alloy coating with external-strength and internal-toughness gradient structure and preparation method thereof |
| CN115449790A (en) * | 2022-10-14 | 2022-12-09 | 长沙理工大学 | Wear-resistant corrosion-resistant high-entropy alloy cladding layer for propeller remanufacturing and preparation method |
| CN115449790B (en) * | 2022-10-14 | 2024-01-19 | 长沙理工大学 | Wear-resistant corrosion-resistant high-entropy alloy cladding layer for remanufacturing of propeller and preparation method |
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