Controllable dissolution-induced uniformly-distributed W2C enhanced medium-entropy alloy-based composite coating method

Abstract

The invention relates to the technical field of laser surface strengthening and repairing of key metal parts, in particular to a controllable dissolution-induced uniformly-distributed W2C enhanced medium-entropy alloy-based composite coating method which comprises the following steps: uniformly mixing tungsten carbide spherical particles with medium-entropy alloy particles to obtain target mixed powder; and the target mixed powder is subjected to laser cladding operation through laser cladding equipment. The method disclosed by the invention has the beneficial effects that on the basis of the idea of controllable dissolution of additional particles and induced precipitation by controlling the temperature of a molten pool, a WC / W2C-NiCoV mixed powder system and a light-electric energy blending technology are creatively applied to the laser cladding process from a material-process-structure integrated additive remanufacturing scheme; the CoNiV medium-entropy alloy-based composite coating in which the primary W2C particles are uniformly and densely distributed is successfully prepared, and the method has important practical significance for realizing laser green manufacturing.

Description

Technical Field

[0001] The invention relates to the technical field of laser surface strengthening and repairing of key metal parts, and in particular to a method for uniformly distributing W2C-reinforced medium-entropy alloy-based composite coating induced by controlled dissolution. Background Art

[0002] As modern industry continues to increase its requirements for material performance, researchers have begun to explore new alloy design concepts, among which "multi-principal element alloys" are an important result of this exploration. The design concept of multi-principal element alloys is to break the limitation of traditional alloys dominated by one element and form a new alloy system by introducing multiple main elements (usually three to five or more). These main elements exist in the alloy in equiatomic ratios or near-equiatomic ratios, thus forming medium entropy alloys (MEA) and high entropy alloys (HEA). Multi-principal element alloys have a series of unique physical and chemical properties, which are mainly derived from their high entropy effect, slow diffusion effect, lattice distortion effect and cocktail effect. These effects make multi-principal element alloys exhibit excellent performance in extreme environments such as high temperature, strong irradiation, high friction and strong corrosion, so they have broad application prospects. Among them, CoNiV medium entropy alloys have attracted much attention due to their excellent mechanical properties and outstanding corrosion resistance and hydrogen embrittlement resistance. However, since the CoNiV medium-entropy alloy with a face-centered cubic structure (FCC) has low hardness and surface wear resistance, it seriously restricts its working life and work efficiency in extreme service environments. Therefore, there is an urgent need for a technology and method that can improve the surface wear resistance of CoNiV medium-entropy alloy.

[0003] Traditional wear-resistant alloy coatings can no longer meet the requirements of medium-entropy alloys for surface wear performance. Ceramic particle-reinforced metal-based composite coatings have not only high hardness and high wear resistance of ceramic particles themselves, but also good toughness of the metal matrix itself, so they have received extensive attention in the repair and strengthening of material surfaces. There are two ways to produce reinforcing particles in composite coatings: one is called external addition, which specifically refers to adding ceramic particles from the outside to the molten pool during laser cladding, and a composite coating can be formed as the molten pool solidifies; the other is called in-situ synthesis, which is characterized by the inclusion of reinforcing particle-forming elements in the original cladding material. When a molten pool is formed on the surface of the substrate, a chemical reaction will occur to form reinforcing particles, which will be preserved during the cladding solidification process and finally form a composite coating. The former has the advantages of being simple and easy to operate and easy to control the spatial distribution of particles, but because the size of the external particles is generally large, the gap between the residual particles in the coating is too large; in addition, the interface bonding performance between the external particles and the matrix is ​​weaker than that of the latter, so it is easy to cause insufficient wear resistance of the composite coating. The advantage of the in-situ synthesis method is that there is a strong metallurgical bond between the reinforcing particles and the matrix, which greatly enhances the resistance to abrasive particles. Its disadvantage is that the traditional in-situ synthesis method requires the original cladding material to be prepared in advance according to the proportion of the theoretical chemical reaction. However, the laser cladding process is an extremely complex physical and chemical thermal process, which includes the interaction between the high-energy laser and the cladding material and the resulting material melting, splashing of the powder material, and non-equilibrium solidification of the molten pool. Therefore, the material concentration ratio in the molten pool has deviated from the theoretical value. Therefore, the composition and distribution of the reinforcing particles in the composite coating after the final solidification are difficult to control, and thus the wear resistance of the composite coating cannot be guaranteed. In summary, if the wear resistance of the medium-entropy alloy-based composite coating is to be further significantly improved, it is necessary to find a technical means that can break through the existing bottleneck of laser cladding, so as to truly realize the high-quality and efficient preparation of CoNiV-based composite coatings, which is in line with the concept and needs of advanced laser manufacturing. Summary of the invention

[0004] In view of the above problems or problems existing in the prior art, the present invention is proposed.

[0005] To solve the above technical problems, the present invention provides the following technical solutions: a method for uniformly distributing W2C-enhanced medium-entropy alloy-based composite coating induced by controlled dissolution, comprising uniformly mixing tungsten carbide spherical particles with medium-entropy alloy particles to obtain a target mixed powder;

[0006] The target mixed powder is laser clad by laser cladding equipment.

[0007] As a preferred scheme of the method for controlled dissolution-induced uniformly distributed W2C reinforced medium-entropy alloy-based composite coating of the present invention, the spherical tungsten carbide particles are eutectic particles of complex phase WC / W2C (including WC and W2C) with a particle size of 10 to 20 microns.

[0008] As a preferred solution of the method for controlled dissolution-induced uniformly distributed W2C-enhanced medium-entropy alloy-based composite coating of the present invention, the medium-entropy alloy particles are CoNiV alloy.

[0009] As a preferred scheme of the method for the controlled dissolution-induced uniformly distributed W2C reinforced medium-entropy alloy-based composite coating of the present invention, wherein: the target mixed powder is a mixed WC / W2C@NiCoV powder.

[0010] As a preferred embodiment of the method for controlling dissolution-induced uniform distribution of W2C reinforced medium-entropy alloy-based composite coating of the present invention, wherein: uniformly mixing tungsten carbide spherical particles with medium-entropy alloy particles comprises:

[0011] The tungsten carbide spherical particles and the medium entropy alloy particles are placed in a ball mill and uniformly mixed by ball milling.

[0012] As a preferred solution of the method for controlled dissolution-induced uniformly distributed W2C reinforced medium-entropy alloy-based composite coating of the present invention, wherein: laser cladding operation is performed on the target mixed powder by laser cladding equipment, including:

[0013] Preparation before laser processing;

[0014] Laser cladding is performed by adopting a synchronous resistance heating platform.

[0015] As a preferred solution of the method for controlled dissolution-induced uniformly distributed W2C reinforced medium-entropy alloy-based composite coating of the present invention, the laser cladding equipment includes:

[0016] Fence, and laser cladding equipment arranged inside the steel fence.

[0017] As a preferred solution of the method for controlled dissolution-induced uniformly distributed W2C reinforced medium-entropy alloy-based composite coating of the present invention, the laser cladding equipment includes:

[0018] High-power fiber laser generator, external auxiliary power supply, shielding gas storage cylinder, shielding gas guide tube, robotic arm, optical fiber, molten pool synchronous camera wiring, boat-shaped workbench, external resistance heater wiring, insulating pad, laser processing head, molten pool topography camera, workpiece synchronous heating platform, workpiece to be clad, resistance heating rod, and high-energy laser beam;

[0019] The workpiece synchronous heating platform is made of copper.

[0020] As a preferred solution of the method for controlled dissolution-induced uniformly distributed W2C reinforced medium-entropy alloy-based composite coating of the present invention, the resistance heating rods are radially distributed around the boat-shaped workbench.

[0021] As a preferred solution of the method for controlled dissolution-induced uniformly distributed W2C reinforced medium-entropy alloy-based composite coating of the present invention, the preparation work before laser processing includes:

[0022] Set the protective gas flow rate;

[0023] Set the laser power and laser scanning speed;

[0024] Adjust the laser defocus and set the laser spot size and the overlap ratio between the melt paths according to the cladding layer width;

[0025] Connect the resistance heating rod to the external auxiliary power supply through the external resistance heater wiring, and adjust the preheating current according to the designed preheating temperature.

[0026] The beneficial effects of the present invention are as follows: based on the idea of ​​controlled dissolution of added particles and controlled temperature of the molten pool to induce precipitation, starting from the material-process-organization integrated additive remanufacturing scheme, the WC / W2C@NiCoV mixed powder system and photo-electric energy allocation technology are creatively applied to the laser cladding process, and a CoNiV medium-entropy alloy-based composite coating with uniform and dense distribution of native W2C particles is successfully prepared. This can not only break through the shortcomings of uneven content and distribution of the reinforcing phase in the traditional in-situ synthesis process relying on element ratio, but also avoid the limitations of poor interface bonding between the reinforcing phase and the substrate and severe decrease in the plastic toughness of the coating caused by the particle addition method, significantly improve the surface wear resistance of metal materials such as medium / high entropy alloys, steel substrates, stainless steel substrates, nickel-based alloys, titanium alloys and aluminum alloys, and has important practical significance for realizing laser green manufacturing. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. Among them:

[0028] Figure 1 Schematic diagram of the preparation of mixed WC / W2C@NiCoV cladding powder.

[0029] Figure 2 A global schematic diagram of the laser cladding device and process.

[0030] Figure 3 Schematic diagram of the structure of the synchronous resistance heating platform.

[0031] Figure 4 Schematic diagram of the basic principles of laser cladding process and method.

[0032] Figure 5Figure 3 is a characterization and performance evaluation result diagram of the coating prepared by the laser cladding material system and process. Specifically, (a) is the metallographic structure of the prepared native W2C particle reinforced CoNiV medium entropy alloy-based composite coating, (b) is the native W2C particle size distribution in the CoNiV-based composite coating, (c) is the XRD spectrum of the composite coating, and (d) is the hardness and wear resistance evaluation results of the composite coating. DETAILED DESCRIPTION

[0033] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0034] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0035] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0036] Example

[0037] Reference Figure 1 to Figure 5 , is an embodiment of the present invention, which provides a method for uniformly distributing W2C reinforced medium entropy alloy-based composite coating induced by controlled dissolution, which includes:

[0038] S1. uniformly mixing tungsten carbide spherical particles and medium entropy alloy particles by low-energy ball milling to obtain a target mixed powder;

[0039] Furthermore, the spherical tungsten carbide particles are eutectic particles of a complex phase WC / W2C (including WC and W2C), and the particle size thereof is 10 to 20 microns.

[0040] It should be noted that the purpose of selecting a small particle size range (10-20 microns) is that the smaller sintered WC / W2C particles have a higher solubility in the molten pool, which is easy to achieve complete dissolution in the molten pool, and then release W and C elements into the molten pool, creating the primary chemical environment for the precipitation of W2C particles. Secondly, the price of WC / W2C particles is relatively low, which is very suitable for large-scale cladding applications.

[0041] Furthermore, the medium-entropy alloy particles are CoNiV alloy, wherein the CoNiV alloy is atomized by a rotating electrode so that the CoNiV particles have good sphericity and uniform composition.

[0042] It should be noted that CoNiV alloy, the medium entropy alloy system often exhibits a single-phase face-centered cubic (fcc) structure, which helps to improve its mechanical properties and stability, and has excellent toughness, corrosion resistance and hydrogen embrittlement resistance. Secondly, the alloy system has good wettability with tungsten carbide particles including WC / W2C and W2C phases, which promotes the construction of a stable interface and can reduce the phenomenon of particle shedding due to interface mismatch.

[0043] Furthermore, the target mixed powder is a mixed WC / W2C@NiCoV powder.

[0044] Further, uniformly mixing the tungsten carbide spherical particles with the medium entropy alloy particles includes:

[0045] The tungsten carbide spherical particles and the medium entropy alloy particles are placed in a ball mill and uniformly mixed by low-energy ball milling.

[0046] In the present disclosure, 10-25 wt.% of WC / W2C particles are mixed with CoNiV particles, and the two particles are placed in a ball mill and mixed uniformly by low-energy ball milling (rotation speed ≤ 200 r / min, rotation for 5 h). Figure 1 As shown in the figure, after mixed ball milling, the tiny WC / W2C particles will evenly adhere to the large CoNiV particles to form mixed WC / W2C@NiCoV powder.

[0047] Preferably, the present invention does not simply adopt the traditional particle addition method or in-situ chemical reaction method to synthesize the reinforcing particles in the composite coating, but uses the multiphase WC / W2C particles as a precursor to induce the precipitation of W2C in the molten pool and together with CoNiV as the original cladding material, further making the reinforcing particles present a spatially uniform distribution in the coating and obtaining a strong ceramic-metal interface bond.

[0048] S2. Perform laser cladding operation on the target mixed powder by using laser cladding equipment.

[0049] Further, the target mixed powder is subjected to laser cladding operation by laser cladding equipment, including:

[0050] Preparation before laser processing;

[0051] Laser cladding is performed by adopting a synchronous resistance heating platform.

[0052] Preferably, using a resistor to preheat the substrate can not only reduce the dependence of powder melting on the laser, but also effectively improve the powder material's absorption rate of laser energy, which can significantly reduce energy loss during processing. If a synchronous heating platform is not used, the melting of the mixed powder can only rely on a high-energy laser beam 18, but the cold powder has a low absorption rate of the laser, so to achieve coating preparation, a higher laser energy input is required, but a higher energy input can easily cause the dilution rate of the substrate to be too high, which in turn causes alloy elements such as Fe in the substrate to enter the high-temperature molten pool and form a coarse M6C structure with the W and C elements released by the WC / W2C particles, thereby making the coating plastic toughness worse, and prone to surface failure problems such as cracks under severe wear conditions such as strong impact and heavy loads.

[0053] Furthermore, the laser cladding equipment includes:

[0054] A fence 2 and a laser cladding device arranged inside the steel fence 2, wherein the fence 2 is made of steel.

[0055] It should be noted that the working state and disconnection of the laser cladding device are controlled by the controller 3 .

[0056] Furthermore, the laser cladding equipment includes:

[0057] High-power fiber laser generator 1, external auxiliary power supply 4, shielding gas storage cylinder 5, shielding gas guide tube 6, robotic arm 7, optical fiber 8, molten pool synchronous camera connection 9, ship-shaped workbench 10, external resistance heater connection 11, insulating pad 12, laser processing head 13, molten pool topography camera 14, workpiece synchronous heating platform 15, workpiece to be clad 16, resistance heating rod 17, and high-energy laser beam 18;

[0058] It should be noted that the insulating pad 12 may be an insulating ceramic plate, such as Figure 4 As shown, Figure 4 19 is the solidified W2C particle reinforced CoNiV-based composite coating, and 20 is the WC / W2C@NiCoV mixed powder prefabricated on the workpiece surface.

[0059] The workpiece synchronous heating platform 15 is made of copper, which can ensure the workpiece synchronous heating platform 15.

[0060] Furthermore, the resistance heating rods 17 are radially distributed around the boat-shaped workbench 10, wherein the resistance heating rods 17 are arranged inside the workpiece synchronous heating platform 15, and the maximum heating temperature is 350°C.

[0061] Further, the preparation work before laser processing includes,

[0062] It should be noted that before laser processing, the prepared WC / W2C@NiCoV mixed powder material is placed on the workpiece by a pre-powder cladding method, wherein the thickness of the powder layer is controlled by selecting different hollow mold thicknesses, and the method of placing the powder material on the workpiece before cladding begins is called a pre-powder cladding method. Further, although the pre-powder cladding method is used for cladding in the present invention, the cladding material system is also applicable to the synchronous powder feeding cladding method, and the pre-powder cladding method is used for the convenience of explaining the actual operation steps of the present invention; Figure 4 As shown in the embedded enlarged image in the figure, the WC / W2C@NiCoV mixed powder is placed on the workpiece with a thickness ranging from 0.5 mm to 2 mm. If the synchronous powder feeding method is adopted, a side axis powder feeding nozzle and a powder feeder can be added to synchronously transport the powder to the laser irradiation area during the laser scanning process.

[0063] Set the protective gas flow rate;

[0064] It should be noted that the flow rate of the shielding gas is set according to the preset powder thickness and the synchronous powder feeding amount, and the setting range is 10 to 20 L / min.

[0065] Set the laser power and laser scanning speed, where the laser power setting range is 800~2000W, and the laser scanning speed setting range is 3~20mm / s;

[0066] Adjust the laser defocus amount and set the laser spot size and the overlap rate between the melt tracks according to the width of the cladding layer, wherein the laser spot size setting range is 2 to 6 mm, and the overlap rate between the melt tracks is 30 to 50%;

[0067] The resistance heating rod 17 is connected to an external auxiliary power supply through an external resistance heater connection 11, and the preheating current is adjusted according to the designed preheating temperature.

[0068] It should be noted that the molten pool temperature needs to be controlled to be above 1242°C (the temperature range in which the W2C phase is easily precipitated), but must also be lower than 1571°C (above 1571°C is the temperature range in which the coarse M6C phase is easily generated). When an external auxiliary heat source is introduced, the combined application of two independent heat sources, resistance heat and laser, provides a powerful condition for the precise control of the molten pool state characteristics by means of photoelectric energy control.

[0069] Preferably, the molten pool temperature is controlled between 1242 and 1571°C by adjusting the preheating current. Within this temperature range, the CoNiV alloy powder will completely melt and form a molten pool, and the tiny WC / W2C particles will completely dissolve in the molten pool and release W and C elements into the molten pool. Furthermore, within the temperature range between 1242 and 1571°C, W2C particles are more likely to precipitate, and the formation of coarse M6C phase is also avoided.

[0070] In the present disclosure, CoNiV medium entropy alloy is used as the substrate (the workpiece to be clad 16), the size of which is 50mm×100mm×8mm, the laser light source used is a fiber 8 laser with a rated power of 2kW, the wavelength of the output laser is 1064nm, the laser spot is circular (the spot size is 4mm), and the laser defocus is set to -10mm; argon gas is selected as the side blowing protective gas, the flow rate is set to 20L / min, the laser power is set to remain unchanged at 1000W, the laser scanning speed is 5mm / s, and the preheating current is set to 60A; the mixed cladding powder is placed on the surface of Q345 steel in advance, with a thickness of 1mm;

[0071] Furthermore, under the action of synchronous resistance heating and laser energy, the powder melts to form a molten pool and keeps the liquid melt temperature stable between 1242 and 1571 ° C. The tiny WC / W2C particles are completely dissolved in the molten pool, releasing W and C elements in the molten pool and promoting the uniform and dense precipitation of W2C particles (the reason is that in the prefabricated mixed powder, after low-energy ball milling, the tiny (10-20 μm) WC / W2C particles are uniformly adhered to the larger (53-150 μm) NiCoV particles. After the NiCoV particles are melted, (Melting point 1253℃) High melting point WC / W2C particles are evenly dispersed in the NiCoV melt, and then the tiny WC / W2C particles quickly dissolve and form a radially distributed W(C) element concentration gradient around them, providing the necessary chemical environment for the precipitation of W2C, so within the appropriate temperature range, the precipitation of native W2C is also uniform). As the laser beam moves, the molten pool quickly solidifies and precipitates W2C particles that are evenly and densely dispersed in the CoNiV matrix, forming a W2C particle-enhanced CoNiV medium entropy alloy composite coating. Its high-magnification metallographic structure is as follows: Figure 5 (a) shows that according to Figure 5 From the original W2C particle size distribution diagram (b), we can see that the average size of the original W2C particles is 5.5 μm. Figure 5 The XRD diffraction pattern of the coating in (c) also fully demonstrates the presence of the W2C phase. After hardness and wear resistance tests, such as Figure 5As shown in (c), the hardness of the composite coating (650HV0.1) is significantly improved compared to the CoNiV (251HV0.1) substrate. In addition, according to the wear volume evaluation, the wear volume of the composite coating is only 0.23mm 3 , while the wear volume of the CoNiV substrate itself is 5.08mm 3 , which further proves that the wear resistance of the composite coating has been significantly improved.

[0072] In summary, the beneficial effect of the method for a controlled dissolution-induced uniformly distributed W2C reinforced medium-entropy alloy-based composite coating of the present invention is that it is based on the idea of ​​controlled dissolution of added particles and controlled temperature of the molten pool to induce precipitation. Starting from the material-process-organization integrated additive remanufacturing scheme, the WC / W2C@NiCoV mixed powder system and the photo-electric energy allocation technology are creatively applied to the laser cladding process, and a CoNiV medium-entropy alloy-based composite coating with uniform and dense distribution of native W2C particles is successfully prepared. It can not only break through the shortcomings of the reinforcing phase content and uneven distribution in the traditional in-situ synthesis process relying on element ratio, but also avoid the limitations of poor interface bonding between the reinforcing phase and the substrate and severe decrease in the plastic toughness of the coating caused by the particle addition method, significantly improve the surface wear resistance of metal materials such as medium / high entropy alloys, steel substrates, stainless steel substrates, nickel-based alloys, titanium alloys and aluminum alloys, which is of great practical significance for realizing laser green manufacturing.

[0073] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A controllable dissolution-induced uniform distribution of W 2 C enhanced medium entropy alloy based composite coating method, Features: include, The tungsten carbide spherical particles and the medium entropy alloy particles are uniformly mixed to obtain a target mixed powder; The target mixed powder is subjected to laser cladding operation by laser cladding equipment.

2. The uniformly distributed W induced by the controlled dissolution as claimed in claim 1 2 C enhanced medium entropy alloy based composite coating method, Features: The tungsten carbide spherical particles are a composite phase WC / W 2 C (including WC and W 2 C) eutectic particles, the particle size of which is 10 to 20 microns.

3. The uniformly distributed W induced by the controlled dissolution as claimed in claim 2 2 C enhanced medium entropy alloy based composite coating method, Features: The medium-entropy alloy particles are CoNiV alloy.

4. The uniformly distributed W induced by the controlled dissolution as claimed in claim 3 2 C enhanced medium entropy alloy based composite coating method, Features: The target mixed powder is a mixed WC / W 2 C@NiCoV powder.

5. The uniformly distributed W induced by the controlled dissolution as claimed in claim 4 2 C enhanced medium entropy alloy based composite coating method, Features: The tungsten carbide spherical particles and the medium entropy alloy particles are uniformly mixed including: The tungsten carbide spherical particles and the medium entropy alloy particles are placed in a ball mill and uniformly mixed by ball milling.

6. The uniformly distributed W induced by the controlled dissolution as claimed in claim 5 2 C enhanced medium entropy alloy based composite coating method, Features: The laser cladding operation on the target mixed powder by laser cladding equipment includes: Preparation before laser processing; Laser cladding is performed by adopting a synchronous resistance heating platform.

7. The uniformly distributed W induced by the controlled dissolution as claimed in claim 6 2 C enhanced medium entropy alloy based composite coating method, Features: The laser cladding equipment comprises: A fence (2), and a laser cladding device arranged inside the steel fence (2).

8. The uniformly distributed W induced by the controlled dissolution as claimed in claim 7 2 C enhanced medium entropy alloy based composite coating method, Features: The laser cladding equipment comprises: A high-power fiber laser generator (1), an external auxiliary power supply (4), a shielding gas storage cylinder (5), a shielding gas guide tube (6), a robotic arm (7), an optical fiber (8), a molten pool synchronization camera connection (9), a boat-shaped workbench (10), an external resistance heater connection (11), an insulating pad (12), a laser processing head (13), a molten pool topography camera (14), a workpiece synchronous heating platform (15), a workpiece to be clad (16), a resistance heating rod (17), and a high-energy laser beam (18); The workpiece synchronous heating platform (15) is made of red copper.

9. The uniformly distributed W induced by the controlled dissolution as claimed in claim 8 2 C enhanced medium entropy alloy based composite coating method, Features: The resistance heating rods (17) are distributed radially around the boat-shaped workbench (10).

10. The controlled dissolution-induced uniform distribution of W according to claim 9 2 C enhanced medium entropy alloy based composite coating method, Features: The preparation work before laser processing includes: Set the protective gas flow rate; Set the laser power and laser scanning speed; Adjust the laser defocus and set the laser spot size and the overlap ratio between the melt paths according to the cladding layer width; The resistance heating rod (17) is connected to the external auxiliary power supply through the external resistance heater wiring (11), and the preheating current is adjusted according to the designed preheating temperature.

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