CN114457272A - High-entropy alloy and method for repairing tungsten-based powder alloy die-casting die by laser cladding - Google Patents
High-entropy alloy and method for repairing tungsten-based powder alloy die-casting die by laser cladding Download PDFInfo
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- CN114457272A CN114457272A CN202210127397.5A CN202210127397A CN114457272A CN 114457272 A CN114457272 A CN 114457272A CN 202210127397 A CN202210127397 A CN 202210127397A CN 114457272 A CN114457272 A CN 114457272A
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D17/00—Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
- B22D17/20—Accessories: Details
- B22D17/22—Dies; Die plates; Die supports; Cooling equipment for dies; Accessories for loosening and ejecting castings from dies
- B22D17/2209—Selection of die materials
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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
- 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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- 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
- C23C24/08—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
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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
- 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
- B22F2009/043—Making metallic powder or suspensions thereof using physical processes starting from solid material, e.g. by crushing, grinding or milling by ball milling
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Abstract
The invention discloses a high-entropy alloy and a method for repairing a tungsten-based powder alloy die-casting die by laser cladding thereof, and aims to apply a high-energy-density laser beam to heat and melt high-entropy alloy powder to form a wear-resistant and high-temperature-resistant high-entropy alloy repairing coating on the worn surface of the tungsten-based powder alloy die-casting die, so that the size and the function of the die are recovered and reused, and the performance of the surface of the die is improved. The high-entropy alloy consists of Co, Cr, Fe, Ni and W, or Mo or Nb is adopted to replace W. The core technology of the invention is that the high-entropy alloy components and the related process and method are used for regulating and controlling the microstructure and the structure of the high-entropy alloy components. The repairing layer prepared by the process and the method has higher wear resistance and thermal conductivity, and the thermal diffusivity value is increased along with the increase of the temperature.
Description
Technical Field
The invention relates to a high-entropy alloy and a method for repairing a tungsten-based powder alloy die-casting die by laser cladding thereof.
Background
In 2004, researchers such as leaf samming and Cantor B break through the traditional research framework and put forward a new alloy design concept, namely the multi-principal element high-entropy alloy. It is composed of five or more elements, and the atomic ratio is 1: 1 or approximately 1: 1, the composition of each element is between 5% and 35%. The alloy is not easy to form brittle intermetallic compounds, but rather forms body-centered cubic phase, face-centered cubic phase, nano-structure and even amorphous structure with simple crystal structure. The high-entropy alloy has high entropy effect thermodynamically, lattice distortion effect structurally, delayed diffusion effect kinetically and cocktail effect functionally, so that the high-entropy alloy has the advantages of high hardness, excellent wear resistance, good corrosion resistance, high-temperature oxidation resistance, good thermal stability and the like. The preparation technology of the high-entropy alloy coating comprises methods such as a thermal spraying method, a sputtering method, laser cladding and the like, and the high-entropy alloy film prepared by the thermal spraying method and the sputtering method has small thickness, is generally micron-sized and has more limitations in practical application; the thickness of the laser cladding high-entropy alloy coating can reach millimeter level, and the mechanical property advantage of the high-entropy alloy is greatly exerted. The use of high entropy alloys, particularly as surface coatings, has been of constant interest to engineers.
The tungsten-base powder alloy is a composite material formed by using tungsten as hard phase and using nickel, copper or nickel, iron and the like as binding phase, has the properties of high heat conductivity, high strength, high density, low thermal expansion coefficient, excellent corrosion resistance, oxidation resistance, impact toughness and the like, and is one of the best materials for manufacturing high-precision dies and die-casting dies. The tungsten-based powder alloy is used for producing non-ferrous metal die-casting dies, and due to the ultra-high thermal conductivity and the low thermal expansion coefficient, non-ferrous metal tissues can be refined, the performance and the dimensional accuracy of non-ferrous metal die-casting parts are improved, and the tungsten-based powder alloy is more and more paid attention to by the industry. In the process of die-casting production of a formed part, molten non-ferrous metal liquid enters a die cavity at high pressure, high temperature and high speed to generate violent impact and scouring on the surface of the die cavity, so that the surface of the die cavity of the tungsten-based powder alloy die-casting die generates corrosion, abrasion and cracks; in the filling process, the metal liquid, impurities and slag can also generate complex chemical action on the surface of the die cavity, so that the corrosion, abrasion and crack generation of the surface of the die cavity are accelerated; in addition, the friction between the die and the casting in the die opening and demoulding process also increases the abrasion of the die surface cavity. Related documents at home and abroad consider that the thermal wear is one of the main reasons for the failure of the tungsten-based powder alloy die-casting die. Excessive wear of the surface of a cavity of a tungsten-based powder alloy die-casting die can cause the dimensional over-tolerance and the surface quality unqualified of a liquid nonferrous metal press-molded part. The tungsten-based powder alloy die-casting die is high in manufacturing cost due to the fact that the tungsten-based powder alloy material is expensive; meanwhile, the difficulty of processing and manufacturing the die is high, and the cost for repairing and maintaining the die after production is high, so that the die is maintained in time, the die is prevented from being further damaged, and the cost for die casting production can be greatly reduced. The reasonable solution is to repair the local damaged cavity surface of the mold by surface engineering technology, so that the size and function of the mold can be recovered and reused, and the performance of the mold surface is improved. Currently, the surface engineering techniques commonly used for engineering materials are Physical Vapor Deposition (PVD), Chemical Vapor Deposition (CVD), electrical discharge deposition, bead welding, cold welding, thermal spraying, and various additive manufacturing techniques developed in recent years. Most of the materials used as the repair layer are alloys or ceramic materials. The alloy material includes self-fluxing alloy powders such as nickel-based, cobalt-based, and iron-based alloy powders, and the like. Ceramic materials include carbide, oxide, and silicide powders, among others. At present, when repairing the abrasion part of the working surface of the die cavity of the tungsten-based powder alloy die-casting die, the main problems exist that the chemical components and the performances of a repairing layer and a base material have large difference, the compatibility and the bonding performance of the materials are poor, the repairing layer on the surface of the die cavity of the repaired tungsten-based powder alloy die-casting die is continuously washed by high pressure, high temperature and high speed of molten metal in the production process of a casting, meanwhile, the repairing layer on the surface of the die cavity absorbs the heat emitted in the solidification process of the molten metal and firstly reaches high temperature to expand, after the die is opened, the repairing layer on the surface of the die cavity is contacted with air to chill and contract to generate tensile stress, the alternating stress is repeatedly circulated, cracks are easily generated at the joint of the repairing layer and the base material interface, and the repairing layer is finally cracked and peeled off along with the increase of the production times. The tungsten-based powder alloy die-casting die cavity surface repairing layer is a working surface and a functional surface, so that the repairing layer used as a repairing layer material must have the performances of heat conductivity, low thermal expansion coefficient, excellent corrosion resistance, oxidation resistance, impact toughness and the like which are similar to those of a tungsten-based powder alloy material. Therefore, how to improve the wear resistance and fatigue resistance of the repair layer of the tungsten-based powder alloy die-casting die and the bonding strength of the repair layer and a substrate, prolong the service life of the die, improve the utilization rate of the die, ensure the high heat conduction and low expansion performance of the surface, and be irremovable responsibility and a long-term and arduous task for scientific research workers.
Disclosure of Invention
The invention aims to provide a high-entropy alloy and a method for repairing a tungsten-based powder alloy die-casting die by laser cladding thereof.
The invention relates to a high-entropy alloy and a method for repairing a tungsten-based powder alloy die-casting die by laser cladding, which comprises the following core technologies: the high-entropy alloy composition and related processes and methods regulate the microstructure and structure of the alloy.
The chemical formula of the high-entropy alloy is CoCrFeNiWxX is more than or equal to 0.5 and less than or equal to 1, and consists of Co, Cr, Fe, Ni and W, wherein the Co, Cr, Fe and Ni have the same mole fraction, and the mole ratio is fixed as 1: 1: 1: 1, the value of W is more than or equal to 0.5 and less than or equal to 1; the components are calculated according to the atomic percentage (at%): 20 to 22.2 percent of cobalt (Co), 20 to 22.2 percent of chromium (Cr), 20 to 22.2 percent of iron (Fe), 20 to 22.2 percent of nickel (Ni) and 11.1 to 20 percent of tungsten (W).
Furthermore, the elements in the high-entropy alloy provided by the invention are Mo or Nb to replace W, and the chemical formula of the high-entropy alloy is CoCrFeNiMo or CoCrFeNiNb. The mol ratio of each element in the components is fixed as 1: 1: 1: 1: 1, in terms of atomic percentage (at%): 20% of cobalt (Co), 20% of chromium (Cr), 20% of iron (Fe), 20% of nickel (Ni) and 20% of molybdenum (Mo); or 20% of cobalt (Co), 20% of chromium (Cr), 20% of iron (Fe), 20% of nickel (Ni) and 20% of niobium (Nb). The related process of the high-entropy alloy comprises two parts, wherein one part is a preparation process of high-entropy alloy powder; the other part is a laser cladding process of the wear-resistant high-temperature-resistant high-entropy alloy repair coating.
Further, the high-entropy alloy and the process and the method for repairing the tungsten-based powder alloy die-casting die by laser cladding are used for preparing the wear-resistant high-temperature-resistant high-entropy alloy repairing coating by the laser cladding method, and comprise the following steps:
firstly, preparing high-entropy alloy powder. The purity of Co, Cr, Fe, Ni, W, Mo and Nb adopted by the high-entropy alloy is more than 99.9 percent, and the particle size of metal powder is 20-50 mu m; according to the designed components, the Co, Cr, Fe, Ni and W (Mo or Nb) metal powder is accurately weighed by an electronic balance with the precision of 0.0001g according to the molar ratio and is put into a ball milling tank, and three zirconia ball milling beads with the diameters of 10mm, 5mm and 3mm are adopted, wherein the weight ratio of the three ball milling beads is 5: 3: 5; uniformly mixing the powder, and carrying out vacuum ball milling, wherein the ball-material ratio is 15: 1, ball milling at the rotating speed of 350r/min for more than 20 hours to obtain high-entropy alloy powder;
secondly, mechanically treating the worn part of the working surface of the die cavity of the tungsten-based powder alloy die-casting die, removing a fatigue layer and a residual stress layer, and removing surface oxides and various dirt;
and step three, uniformly coating the high-entropy alloy powder prepared in the step one on the surface of a pretreated matrix to form a preset layer with the thickness of 0.8-1.2mm, heating the high-entropy alloy powder by adopting an optical fiber continuous laser, and obtaining a high-entropy alloy cladding layer on the surface of a tungsten-based powder alloy die-casting die cavity, wherein the optical fiber continuous laser with high energy density is optimized to obtain the laser cladding process parameters as follows: the laser power is 1600W, the scanning speed is 4mm/s, the diameter of a light spot is 3.5mm, the defocusing amount is 30mm, the protective gas is argon, and the gas flow is 15L/min.
The novel aspect of the high-entropy alloy is that the alloy is formed by mixing a plurality of elements in equal proportion or approximately equal proportion. The main elements of the high-entropy alloy are 37, wherein the application ratio of Co, Cr, Fe and Ni in the high-entropy alloy is up to more than 70%, and various high-entropy alloy systems of 480 can be formed. Refractory elements such as Mo, Nb, V and Zr also belong to common elements in high-entropy alloys. The high-entropy alloy has various varieties, and the high-entropy effect is a main factor for regulating and controlling the microstructure and the structure of the high-entropy alloy. The amount of alloying elements and the processing conditions have a significant influence on their microstructure. The structural differences of the high-entropy alloy show different structural properties and functional characteristics. The invention relates to a high-entropy alloy and a process and a method for repairing a tungsten-based powder alloy die-casting die by laser cladding thereof. The tungsten, iron and nickel elements in the high-entropy alloy coating are the same as those of the base material, and the cobalt, chromium, molybdenum and niobium elements also have good compatibility with the tungsten-based powder alloy, so that the element diffusion and good metallurgical bonding between the formed high-entropy alloy coating and the base are ensured. The chromium element in the high-entropy alloy coating ensures good oxidation resistance and corrosion resistance of the coating, and the nickel, cobalt, molybdenum and niobium elements ensure good high-temperature performance of the high-entropy alloy coating; tungsten and molybdenum have extremely strong thermal conductivity, and the tungsten element or molybdenum element added into the high-entropy alloy coating can greatly improve the thermal conductivity of the coating, thereby improving the performance of producing non-ferrous metal castings by die casting. The high-entropy alloy coating has good thermal stability, wear resistance, red hardness, thermal conductivity, oxidation resistance and corrosion resistance, is close to the linear expansion coefficient of the tungsten-based powder alloy, and has good compatibility and bonding property between the materials, and the wear resistance and high temperature resistance of a tungsten-based powder alloy die-casting die can be improved by cladding the wear-resistant high-entropy alloy coating on the surface of the tungsten-based powder alloy by laser. The microstructure of the wear-resistant high-temperature-resistant high-entropy alloy coating presents a typical dendritic structure represented by a scanning electron microscope. As can be known from the X-ray diffraction pattern identifier phase of the coating, the high-entropy alloy coating mainly comprises a body-centered cubic solid solution (similar to W with a body-centered cubic structure) and a small amount of Fe-Ni face-centered cubic solid solution, and has a typical high-entropy alloy phase structure. Due to the high-entropy effect and the rapid laser solidification, the high-entropy alloy coating has higher thermal stability and is suitable for working conditions in the process of die-casting nonferrous metals.
Compared with the prior art, the invention has the beneficial effects that:
according to the high-entropy alloy and the process and the method for repairing the tungsten-based powder alloy die-casting die by laser cladding thereof, the wear-resistant and high-temperature-resistant high-entropy alloy repairing coating is formed on the worn surface of the tungsten-based powder alloy by utilizing the high-energy-density laser beam, the linear expansion coefficient of the high-entropy alloy repairing coating is similar to that of the tungsten-based powder alloy, and the high-entropy alloy repairing coating and the tungsten-based powder alloy are good in compatibility and bonding; meanwhile, the thermal conductivity is higher, and the thermal diffusivity value is increased along with the increase of the temperature.
Drawings
FIG. 1 is a Scanning Electron Microscope (SEM) picture of a bonding interface of a tungsten-based powder alloy surface laser cladding high-entropy alloy coating;
FIG. 2 is a Scanning Electron Microscope (SEM) picture of laser cladding of a high-entropy alloy coating on the surface of a tungsten-based powder alloy;
FIG. 3 is an X-ray diffraction pattern (XRD) of the tungsten-based powder alloy surface laser cladding high-entropy alloy coating.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. The following examples are presented merely to further understand and practice the present invention and are not to be construed as further limiting the claims of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The process of the present invention is further illustrated in detail by the examples given below.
The invention relates to a high-entropy alloy and a process and a method for repairing a tungsten-based powder alloy die-casting die by laser cladding thereof. The chemical formula of the wear-resistant high-temperature-resistant high-entropy alloy coating is CoCrFeNiWxX is more than or equal to 0.5 and less than or equal to 1, and consists of Co, Cr, Fe, Ni and W, wherein the Co, Cr, Fe and Ni have the same mole fraction, and the value of W is more than or equal to 0.5 and less than or equal to 1. The elements in the high-entropy alloy provided by the invention are Mo or Nb instead of W.
The invention relates to a high-entropy alloy and a process and a method for repairing a tungsten-based powder alloy die-casting die by laser cladding, which are used for preparing a wear-resistant high-temperature-resistant high-entropy alloy repairing coating by a laser cladding method, and comprise the following steps:
firstly, preparing high-entropy alloy powder. The purity of Co, Cr, Fe, Ni, W, Mo and Nb adopted by the high-entropy alloy is more than 99.9 percent, and the particle size of metal powder is 20-50 mu m; accurately weighing Co, Cr, Fe, Ni and W (Mo or Nb) metal powder according to the designed components by adopting an electronic balance with the precision of 0.0001g according to the molar ratio, putting the metal powder into a ball milling tank, and adopting three zirconia ball milling beads with the diameters of 10mm, 5mm and 3mm respectively, wherein the weight ratio of the three zirconia ball milling beads is 5: 3: 5; uniformly mixing the powder, and carrying out vacuum ball milling, wherein the ball-material ratio is 15: 1, ball milling at the rotating speed of 350r/min for more than 20 hours to obtain high-entropy alloy powder;
secondly, mechanically treating the worn part of the working surface of the die cavity of the tungsten-based powder alloy die-casting die, removing a fatigue layer and a residual stress layer, and removing surface oxides and various dirt;
and step three, uniformly coating the high-entropy alloy powder prepared in the step one on the surface of a pretreated matrix to form a preset layer with the thickness of 0.8-1.2mm, heating the high-entropy alloy powder by adopting an optical fiber continuous laser, and obtaining a high-entropy alloy cladding layer on the surface of a tungsten-based powder alloy die-casting die cavity, wherein the optical fiber continuous laser with high energy density is optimized to obtain the laser cladding process parameters as follows: the laser power is 1600W, the scanning speed is 4mm/s, the diameter of a light spot is 3.5mm, the defocusing amount is 30mm, the protective gas is argon, and the gas flow is 15L/min.
The invention relates to a high-entropy alloy and a process and a method for repairing a tungsten-based powder alloy die-casting die by laser cladding thereof. The tungsten-based powder alloy comprises the following components in percentage by mass (Wt%): w: 97, N: 2.1, Fe: 0.9.
examples are given in table 1 below.
The invention relates to a high-entropy alloy and a process and a method for repairing a tungsten-based powder alloy die-casting die by laser cladding, which are used for repairing the tungsten-based powder alloy die-casting die according to the process steps and components to achieve the technical indexes:
(1) the hardness of the high-entropy alloy coating formed after repair is 1.3-1.9 times that of the tungsten-based powder alloy matrix;
(2) the hardness of the high-entropy alloy coating formed after repairing is 1.2-1.8 times that of the tungsten-based powder alloy matrix after heat preservation for 12 hours at 800 ℃;
(3) the relative wear resistance of the high-entropy alloy coating formed after repair is 1.4-1.8 times that of the tungsten-based powder alloy matrix.
TABLE 1 coating alloy compositions and performance indices thereof
While embodiments of the invention have been disclosed above, it is not intended to be limited to the uses set forth in the specification and examples. It can be applied to all kinds of fields suitable for the present invention. Additional modifications will readily occur to those skilled in the art. It is therefore intended that the invention not be limited to the exact details and illustrations described and illustrated herein, but fall within the scope of the appended claims and equivalents thereof.
Claims (3)
1. A high-entropy alloy and a method for repairing a tungsten-based powder alloy die-casting die by laser cladding thereof are characterized in that: the chemical formula of the high-entropy alloy is CoCrFeNiWxX is more than or equal to 0.5 and less than or equal to 1, and consists of Co, Cr, Fe, Ni and W, wherein the Co, Cr, Fe and Ni have the same mole fraction, and the mole ratio is fixed as 1: 1: 1: 1, the value of W is more than or equal to 0.5 and less than or equal to 1; the components are at% in atomic percentage: 20 to 22.2 percent of cobalt, 20 to 22.2 percent of chromium, 20 to 22.2 percent of ferrum, 20 to 22.2 percent of nickel and 11.1 to 20 percent of tungsten.
2. The high-entropy alloy and the method for repairing the tungsten-based powder alloy die-casting die by laser cladding thereof according to claim 1, wherein the method comprises the following steps: the elements in the high-entropy alloy are Mo or Nb to replace W, and the chemical formula of the high-entropy alloy is CoCrFeNiMo or CoCrFeNiNb; the mol ratio of each element in the components is fixed as 1: 1: 1: 1: 1, at% in atomic percentage: 20% of cobalt, 20% of chromium, 20% of iron, 20% of nickel and 20% of molybdenum; or 20% of cobalt, 20% of chromium, 20% of iron, 20% of nickel (Ni) and 20% of niobium.
3. The high-entropy alloy and the method for repairing the tungsten-based powder alloy die-casting die by laser cladding thereof as claimed in claim 1 or 2, wherein the high-entropy alloy powder is prepared by adopting a mechanical alloying method, and the wear-resistant high-temperature-resistant high-entropy alloy coating is prepared by adopting a laser cladding method, and the method comprises the following specific steps:
firstly, preparing high-entropy alloy powder, wherein the purity of Co, Cr, Fe, Ni, W, Mo and Nb adopted by the high-entropy alloy is more than 99.9%, and the particle size of the metal powder is 20-50 mu m; accurately weighing Co, Cr, Fe, Ni and W or Mo or Nb metal powder according to the designed components by adopting an electronic balance with the precision of 0.0001g according to the molar ratio, putting the Co, Cr, Fe, Ni and W or Mo or Nb metal powder into a ball milling tank, and adopting three zirconia ball milling beads with the diameters of 10mm, 5mm and 3mm respectively, wherein the weight ratio of the three zirconia ball milling beads is 5: 3: 5; uniformly mixing the powder, and carrying out vacuum ball milling, wherein the ball-material ratio is 15: 1, ball milling at the rotating speed of 350r/min for more than 20 hours to obtain high-entropy alloy powder;
secondly, mechanically treating the worn part of the working surface of the die cavity of the tungsten-based powder alloy die-casting die, removing a fatigue layer and a residual stress layer, and removing surface oxides and various dirt;
and step three, uniformly coating the high-entropy alloy powder prepared in the step one on the surface of a pretreated matrix to form a preset layer with the thickness of 0.8-1.2mm, heating the high-entropy alloy powder by adopting an optical fiber continuous laser, and obtaining a high-entropy alloy cladding layer on the surface of a tungsten-based powder alloy die-casting die cavity, wherein the optical fiber continuous laser with high energy density is optimized to obtain the laser cladding process parameters as follows: the laser power is 1600W, the scanning speed is 4mm/s, the diameter of a light spot is 3.5mm, the defocusing amount is 30mm, the protective gas is argon, and the gas flow is 15L/min.
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| CN116657018A (en) * | 2023-06-12 | 2023-08-29 | 济南大学 | High-entropy alloy layer piece and preparation method thereof |
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