Iron-based high-hardness alloy powder for laser cladding and application

Abstract

The invention provides iron-based high-hardness alloy powder for laser cladding and application, and belongs to the field of laser cladding. The ceramic particle reinforced iron-based high-hardness alloy powder consists of the following chemical components: greater than or equal to 50% of an iron-based alloy powder material and less than or equal to 50% of a ceramic particle material. By reasonably designing the chemical components of the ceramic particle reinforced iron-based high-hardness alloy powder, the hardness of the iron-based high-hardness alloy powder can reach 64 HRC or above, and the ceramic particles can improve the wear resistance of a cladding layer. When the ceramic particles are added into the cladding layer, due to the fact that the ceramic particles are good in thermal stability and high in hardness, the dispersion strengthening effect can be achieved, the interface between the particles and the iron-based material can serve as a crack propagation obstacle, and the abrasion resistance of the cladding layer is improved. Therefore, the technical problems of insufficient hardness and insufficient wear resistance of a cladding layer formed by laser cladding are solved.

Description

Technical Field

[0001] This application relates to the field of laser cladding technology, and particularly to an iron-based high-hard alloy powder for laser cladding and its application. Background Art

[0002] Laser cladding technology is a surface modification technology. It uses a high-energy laser beam to form a molten pool on the surface of the base material, blows the laser cladding powder material into the molten pool and solidifies it, and finally forms a metallurgically bonded cladding layer on the surface. With the development and application of laser cladding technology, the market has put forward requirements for high hardness and high wear resistance of the cladding layer.

[0003] Currently, the hardness of the commonly used materials in the market after cladding fails to reach 64 HRC, and the wear resistance also does not meet the requirements. For some high-hardness materials, such as M2 tool steel, the surface quality is poor after cladding, and the cracking problem is serious. Summary of the Invention

[0004] This application provides an iron-based high-hard alloy powder for laser cladding and its application to solve the technical problems of insufficient hardness and insufficient wear resistance of the cladding layer formed by laser cladding in the prior art.

[0005] In a first aspect, an embodiment of this application provides a ceramic particle-reinforced iron-based high-hard alloy powder for laser cladding. In terms of mass fraction, the ceramic particle-reinforced iron-based high-hard alloy powder is composed of the following chemical components: iron-based alloy powder material ≥ 50%, ceramic particle material ≤ 50%.

[0006] Optionally, in terms of mass fraction, the ceramic particle-reinforced iron-based high-hard alloy powder is composed of the following chemical components: iron-based alloy powder material ≥ 50%, ceramic particle material > 0 and ≤ 50%.

[0007] Optionally, in terms of mass fraction, the iron-based alloy powder material is composed of the following chemical components: Cr: 12% - 20%, Ni: 0.1% - 2%, Mn: 0.3% - 1%, C: 0.1% - 0.4%, Si: 1% - 2%, V: 0.1% - 0.4%, and the balance is Fe; or

[0008] In terms of mass fraction, the iron-based alloy powder material is composed of the following chemical components: Cr: 16.25%, Mn: 0.6%, C: 0.25%, Si: 1.65%, V: 0.25%, Ni: 0.33%, and the balance is Fe.

[0009] Optionally, in terms of mass fraction, the iron-based alloy powder material is composed of the following chemical components: Cr: 18%, Mn: 1%, C: 0.3%, Si: 1.0%, V: 0.1%, Ni: 0.2%, and the balance is Fe.

[0010] Optionally, the size of the iron-based high-hard alloy powder is 50 μm to 150 μm and shows a normal distribution.

[0011] Optionally, the ceramic particle material is TiC ceramic particles.

[0012] Optionally, the size of the ceramic particle material is 50 μm to 150 μm and shows a normal distribution.

[0013] In a second aspect, the present application provides an application of the ceramic particle-reinforced iron-based high-hard alloy powder according to any one of the embodiments in the first aspect, and the ceramic particle-reinforced iron-based high-hard alloy powder is used for laser cladding.

[0014] Optionally, the laser cladding satisfies the following conditions: the power is 2400 W to 3400 W, the scanning speed is 16 mm / s to 25 mm / s, the overlapping amount is 58% to 62%, and the spot size is 3.5 mm to 5.5 mm.

[0015] Optionally, the hardness of the laser cladding layer formed by the laser cladding is ≥64 HRC.

[0016] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the prior art:

[0017] The embodiments of the present application provide a ceramic particle-reinforced iron-based high-hard alloy powder for laser cladding. In terms of mass fraction, the ceramic particle-reinforced iron-based high-hard alloy powder is composed of the following chemical components: the iron-based alloy powder material ≥50%, and the ceramic particle material ≤50%. By reasonably designing the chemical composition of the ceramic particle-reinforced iron-based high-hard alloy powder, the hardness of the iron-based high-hard alloy powder can reach above 64 HRC, and the ceramic particles can improve the wear resistance of the cladding layer. When the ceramic particles are added to the cladding layer, due to their good thermal stability and high hardness, they can play a role in dispersion strengthening. The interface between the particles and the iron-based material can act as an obstacle to crack propagation, thereby improving the wear resistance of the cladding layer. Thus, the technical problems of insufficient hardness and insufficient wear resistance of the cladding layer formed by laser cladding are solved. Description of the Drawings

[0018] The drawings here are incorporated into the specification and form a part of the specification, showing the embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0020] Figure 1 Schematic diagram of the iron-based alloy powder provided in Embodiment 1 of the present application;

[0021] Figure 2 Schematic diagram of the ceramic particles provided in Embodiment 1 of the present application;

[0022] Figure 3 Macroschematic diagram of the clad layer formed by laser cladding provided in Embodiment 1 of the present application;

[0023] Figure 4 Microstructure schematic diagram of the clad layer formed by laser cladding provided in Embodiment 1 of the present application;

[0024] Figure 5 Microstructure schematic diagram of the clad layer formed by laser cladding provided in Embodiment 2 of the present application. Detailed implementation manners

[0025] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without making creative efforts shall fall within the protection scope of the present application.

[0026] The various embodiments of the present application may exist in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be construed as a rigid limitation on the scope of the present application; therefore, it should be considered that the described range description has specifically disclosed all possible sub-ranges and single values within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within that range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Additionally, whenever a numerical range is indicated herein, it means including any cited number (fraction or integer) within the indicated range.

[0027] In addition, in the description of the specification of this application, terms such as "including" and "comprising" mean "including but not limited to". In this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In this text, "and / or" describes the associated relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. Where A and B can be singular or plural. In this text, "at least one" means one or more, and "multiple" means two or more. "At least one kind", "at least one of the following items (pieces)" or similar expressions refer to any combination of these items, including any combination of single item (piece) or plural items (pieces). For example, "at least one of a, b, or c", or, "at least one of a, b, and c" can both mean: a, b, c, a-b (i.e., a and b), a-c, b-c, or a-b-c, where a, b, and c can be single or multiple respectively. The "parts representation method" such as weight parts and mass parts represents the proportional relationship between each component. In the proportional relationships involved in this text, the parameters that need to be described by the ratio should be understood as the antecedents of the ratio formula in the order of description, and the ratio numbers should be understood as the consequents of the ratio formula. For example, if the mass ratio of substance A, substance B, and substance C is 1:2:3, then substance A, substance B, and substance C should correspond one by one with the ratio numbers in the ratio formula in the order of description, that is, the mass of substance A: the mass of substance B: the mass of substance C = 1:2:3.

[0028] Unless otherwise specifically stated, all kinds of raw materials, reagents, instruments, equipment, etc. used in this application can be obtained through market purchase or can be prepared by existing methods.

[0029] This application provides a ceramic particle-reinforced iron-based high-hard alloy powder for laser cladding. In terms of mass fraction, the ceramic particle-reinforced iron-based high-hard alloy powder is composed of the following chemical components: iron-based alloy powder material ≥ 50%, and ceramic particle material ≤ 50%.

[0030] In the embodiments of the present application, the chemical composition of the ceramic particle-reinforced iron-based high-hard alloy powder is reasonably designed. The hardness of the iron-based high-hard alloy powder can reach above 64 HRC, and the ceramic particles can improve the wear resistance of the cladding layer. When the ceramic particles are added to the cladding layer, due to their good thermal stability and high hardness, they can play a role in dispersion strengthening. The interface between the particles and the iron-based material can act as an obstacle to crack propagation, thereby improving the wear resistance of the cladding layer. Thus, the technical problems of insufficient hardness and insufficient wear resistance of the cladding layer formed by laser cladding are solved. Exemplarily, the mass fraction of the iron-based alloy powder material can be 50%, 55%, 60%, 65%, 70%, 75%, 85%, 95%, etc., and the mass fraction of the ceramic particle material can be 0, 5%, 15%, 25%, 35%, 45%, 50%, etc.

[0031] In some embodiments, by mass fraction, the ceramic particle-reinforced iron-based high-hard alloy powder is composed of the following chemical components: iron-based alloy powder material ≥ 50%, ceramic particle material > 0 and ≤ 50%.

[0032] In some embodiments, by mass fraction, the iron-based alloy powder material is composed of the following chemical components: Cr: 12% - 20%, Ni: 0.1% - 2%, Mn: 0.3% - 1%, C: 0.1% - 0.4%, Si: 1% - 2%, V: 0.1% - 0.4%, and the balance is Fe.

[0033] It should be noted that Fe is the matrix element, and the specific content / content range of Fe can be obtained through the upper and lower limit formulas of the components, that is: the sum of the percentage contents of each component in a composition should be equal to 100%; the content ranges of several components should meet the following conditions: the upper limit value of a certain component + the lower limit value of other components ≤ 100; the lower limit value of a certain component + the upper limit value of other components ≥ 100.

[0034] In the embodiments of the present application, the chemical composition of the iron-based alloy powder material is reasonably designed. Cr, Ni, Mn, C, Si, and V react with Fe to form a high-hardness structural alloy, and the hardness can reach above 64 HRC. Through composition design, laser cladding can be carried out on the surfaces of ultra-high carbon steel and high-alloy steel with a carbon content exceeding 1.5. Exemplarily, the mass fraction of Cr can be 12%, 13%, 15%, 17%, 19%, 20%, etc., the mass fraction of Ni can be 0.1%, 0.3%, 0.5%, 0.7%, 1.0%, 1.5%, 2%, etc., the mass fraction of Mn can be 0.3%, 0.4%, 0.5%, 0.6%, 0.7%, 0.9%, 1%, etc., the mass fraction of C can be 0.1%, 0.2%, 0.3%, 0.4%, etc., the mass fraction of Si can be 1%, 1.2%, 1.4%, 1.6%, 1.8%, 2%, etc., and the mass fraction of V can be 0.1%, 0.2%, 0.3%, 0.35%, 0.4%, etc.

[0035] In some embodiments, by mass fraction, the iron-based alloy powder material is composed of the following chemical components: Cr: 16.25%, Mn: 0.6%, C: 0.25%, Si: 1.65%, V: 0.25%, Ni: 0.33%, and the balance is Fe.

[0036] In some embodiments, by mass fraction, the iron-based alloy powder material is composed of the following chemical components: Cr: 18%, Mn: 1%, C: 0.3%, Si: 1.0%, V: 0.1%, Ni: 0.2%, and the balance is Fe.

[0037] In some embodiments, the size of the iron-based high-hard alloy powder is 50 μm to 150 μm and shows a normal distribution.

[0038] When the size of the iron-based high-hard alloy powder is 50 μm to 150 μm and shows a normal distribution, the powder particles are of uniform size, which helps to form a uniform and dense cladding layer during the laser cladding process. The uniform powder size can reduce the pores and cracks in the cladding layer and improve the overall quality and performance of the cladding layer. At the same time, the uniformity of the powder size helps to form a uniform microstructure in the cladding layer, thereby improving the hardness, strength, and wear resistance of the cladding layer.

[0039] In some embodiments, the ceramic particle material is TiC ceramic particles.

[0040] TiC ceramic particles themselves have extremely high hardness. Adding them to the cladding layer can significantly increase the overall hardness. At the same time, TiC particles are evenly distributed in the cladding layer, playing a role of dispersion strengthening and improving the strength and wear resistance of the cladding layer. In addition, the interface between TiC particles and the Fe-based material can act as an obstacle to crack propagation, improving the crack resistance of the cladding layer.

[0041] In some embodiments, the size of the ceramic particle material is 50 μm to 150 μm and presents a normal distribution.

[0042] When the size of the ceramic particle material is 50 μm to 150 μm and presents a normal distribution, the ceramic particles can be evenly distributed in the cladding layer, playing a role in dispersion strengthening, which helps to improve the hardness and wear resistance of the cladding layer, while maintaining good toughness and plasticity. At the same time, the uniform ceramic particle size can reduce the stress concentration and the tendency of crack propagation in the cladding layer, contributing to the improvement of the stability and service life of the cladding layer.

[0043] Based on a general inventive concept, the embodiments of the present application provide an application of the ceramic particle-reinforced iron-based high-hard alloy powder described in any one of the above embodiments, and the ceramic particle-reinforced iron-based high-hard alloy powder is used for laser cladding.

[0044] In some embodiments, the laser cladding meets the following conditions: the power is 2400 W to 3400 W, the scanning speed is 16 mm / s to 25 mm / s, the overlapping amount is 58% to 62%, and the spot size is 3.5 mm to 5.5 mm.

[0045] Under the laser cladding parameters developed in the embodiments of the present application, the maximum mass fraction of TiC ceramic particles that can be added can reach 50%. The power of laser cladding is 2400W - 3400W, which can control the melt depth and melt width of the cladding layer. Excessive power may cause overheating, burning or cracking of the cladding layer; too low power may cause incomplete penetration or poor bonding of the cladding layer. The scanning speed is limited to 16mm / s - 25mm / s, which affects the cooling rate and microstructure of the cladding layer. Too fast scanning speed may cause the cladding layer to cool too quickly, resulting in cracking or incomplete penetration; too slow scanning speed may cause overheating and coarsening of the cladding layer. The overlapping amount is limited to 58% - 62%, which can ensure good bonding between the cladding layers. Too small overlapping amount may cause voids or poor bonding between the cladding layers; too large overlapping amount may cause excessive overlap of the cladding layers, wasting materials. The spot size is limited to 3.5mm - 5.5mm, which can affect the energy density and melt pool shape of the cladding layer. Too small spot size may cause too high energy density, resulting in overheating or burning; too large spot size may cause too low energy density, incomplete penetration or poor bonding of the cladding layer. Exemplarily, the power of laser cladding can be 2400W, 2600W, 2800W, 3000W, 3200W, 3400W, etc., the scanning speed can be 16mm / s, 17mm / s, 19mm / s, 21mm / s, 23mm / s, 25mm / s, etc., the overlapping amount can be 58%, 59%, 60%, 61%, 62%, etc., and the spot size can be 3.5mm, 4.0mm, 4.5mm, 5.0mm, 5.5mm, etc.

[0046] In some embodiments, the hardness of the laser cladding layer formed by laser cladding is ≥64HRC.

[0047] The iron-based high-hard alloy powder + ceramic particle system for laser cladding and its parameter design provided by the embodiments of the present application achieve a laser cladding layer with high hardness, good wear resistance and no macroscopic defects on the surface of high-alloy steel and ultra-high-carbon steel with a carbon content exceeding 1.5 by precisely controlling each component and process parameters.

[0048] In summary, the iron-based high-hard alloy powder for laser cladding and its application provided by the embodiments of the present application have the following advantages:

[0049] (1) High hardness and wear resistance: By reasonably designing the chemical composition of the iron-based alloy powder material, including the precise ratio of elements such as Cr, Ni, Mn, C, Si, V, etc., the hardness of the iron-based high-hard alloy powder reaches above 64HRC, significantly improving the hardness of the cladding layer. At the same time, adding TiC ceramic particles further enhances the wear resistance of the cladding layer. The high hardness and thermal stability of TiC play a role of dispersion strengthening in the cladding layer, significantly improving the overall hardness.

[0050] (2) Excellent clad layer quality: The sizes of both the iron-based high-hardness alloy powder and the ceramic particle material are in the range of 50μm to 150μm and show a normal distribution, ensuring the uniformity of the powder particles and contributing to the formation of a uniform and dense clad layer during laser cladding. The uniform powder size reduces the pores and cracks in the clad layer, improving the overall quality and performance of the clad layer.

[0051] (3) Wide applicability: The ceramic particle-reinforced iron-based high-hardness alloy powder for laser cladding in this application is applicable to the surfaces of high-alloy steels and ultra-high-carbon steels with a carbon content exceeding 1.5, expanding the application range of laser cladding technology.

[0052] (4) Optimized laser cladding parameters: By precisely controlling parameters such as the power, scanning speed, overlap amount, and spot size of laser cladding, good formability and no macroscopic defects of the clad layer are ensured. At the same time, the optimized parameter design not only improves the cladding efficiency but also guarantees the quality and performance of the clad layer.

[0053] (5) Flexible composition adjustment: The compositions of the iron-based alloy powder material and the ceramic particle material can be flexibly adjusted according to specific requirements to meet the requirements for the hardness and wear resistance of the clad layer in different application scenarios.

[0054] (6) Extended service life: Due to the high hardness and excellent wear resistance of the clad layer, the service life of the clad components can be significantly improved, reducing the frequency of replacement and maintenance.

[0055] The following will further elaborate on this application in combination with specific embodiments. It should be understood that these embodiments are only used to illustrate this application and not to limit the scope of this application. The experimental methods without specific conditions noted in the following embodiments are usually determined according to industry standards. If there is no corresponding industry standard, they are carried out according to general international standards, conventional conditions, or the conditions recommended by the manufacturer.

[0056] Example 1

[0057] The Fe-based high-hardness alloy powder + ceramic particle system for laser cladding in this example consists of Fe-based high-hardness alloy powder and ceramic particles. The chemical composition mass fractions of the Fe-based high-hardness alloy powder are as follows:

[0058] Cr: 16.25%

[0059] Mn: 0.6%

[0060] C: 0.25%

[0061] Si: 1.65%

[0062] V: 0.25%

[0063] Ni: 0.33%

[0064] Fe: the balance.

[0065] Among them, the ceramic particles are TiC particles, and the added mass fraction is 3%. The sizes of the Fe-based high-hard alloy powder and the ceramic particles are selected to be 50 μm to 150 microns, with a normal distribution.

[0066] The laser cladding parameters are selected as follows: the power of laser cladding is 2800 W, the scanning speed of laser cladding is 18 mm / s, the overlapping amount of the laser cladding is 60%, and the spot size of the laser cladding is 5 mm.

[0067] The macroscopic structure of the cladding layer is as Figure 3 shown. It can be seen from Figure 3 that there are no macroscopic defects. The microscopic structure is as Figure 4 shown. It can be seen from Figure 4 that no defects such as pores, cracks, and poor fusion are found in the microscopic structure. At the same time, the structure is relatively uniform and refined, and the hardness of the cladding layer is 65 HRC.

[0068] Example 2

[0069] The Fe-based high-hard alloy powder + ceramic particle system for laser cladding in this example consists of Fe-based high-hard alloy powder and ceramic particles. The chemical composition mass fractions of the Fe-based high-hard alloy powder are as follows:

[0070] Cr: 18%

[0071] Mn: 1%

[0072] C: 0.3%

[0073] Si: 1.0%

[0074] V: 0.1%

[0075] Ni: 0.2%

[0076] Fe: the balance.

[0077] Among them, the ceramic particles are TiC particles, and the added mass fraction is 30%. The sizes of the Fe-based high-hard alloy powder and the ceramic particles are selected to be 50 μm to 150 microns, with a normal distribution.

[0078] The laser cladding parameters are selected as follows: the power of laser cladding is 3000 W, the scanning speed of laser cladding is 20 mm / s, the overlapping amount of the laser cladding is 59%, and the spot size of the laser cladding is 4.5 mm.

[0079] The microscopic structure of the cladding layer is as Figure 5 shown. It can be seen from Figure 5It can be seen that no defects such as pores, cracks, and poor fusion are found in the microstructure. At the same time, the structure is relatively uniform and refined, and the hardness of the cladding layer is 66HRC.

[0080] In summary, the development and application of an Fe-based high-hard alloy powder + ceramic particle system for laser cladding provided by the embodiments of the present application obtain a high-hardness structural alloy through composition design, with a hardness reaching above 64HRC. 3% and 30% of TiC ceramic particles are added to the cladding layer. After adopting the laser cladding parameters developed by the present application, a high-hardness alloy cladding layer with good morphology, density, and uniformity is formed.

[0081] Comparative Example 1

[0082] The difference between this comparative example and Example 1 is as follows:

[0083] The Fe-based high-hard alloy powder + ceramic particle system for laser cladding in this comparative example consists of Fe-based high-hard alloy powder and ceramic particles. The chemical composition mass fractions of the Fe-based high-hard alloy powder are as follows:

[0084] Cr: 9%

[0085] Mn: 0.6%

[0086] C: 0.25%

[0087] Si: 1.65%

[0088] V: 0.25%

[0089] Ni: 0.33%

[0090] Fe: the balance.

[0091] Among them, the ceramic particles are TiC particles, and the added mass fraction is 10%. The sizes of the Fe-based high-hard alloy powder and the ceramic particles are selected to be 50μm to 150 microns, with a normal distribution.

[0092] The laser cladding parameters are selected as follows: the power of laser cladding is 3000W, the scanning power of laser cladding is 20mm / s, the overlapping amount of the laser cladding is 59%, and the spot size of the laser cladding is 4.5mm.

[0093] The hardness of the cladding layer formed by laser cladding is 55HRC.

[0094] Comparative Example 2

[0095] The difference between this comparative example and Example 1 is as follows:

[0096] The Fe-based high-hard alloy powder + ceramic particle system for laser cladding in this comparative example consists of Fe-based high-hard alloy powder and ceramic particles. The chemical composition mass fractions of the Fe-based high-hard alloy powder are as follows:

[0097] Cr: 22%

[0098] Mn: 0.6%

[0099] C: 0.5%

[0100] Si: 1.65%

[0101] V: 0.25%

[0102] Ni: 0.33%

[0103] Fe: the balance.

[0104] Among them, the ceramic particles are TiC particles, the added mass fraction is 30%, and the sizes of the Fe-based high-hard alloy powder and the ceramic particles are selected to be 50 μm to 150 microns, with a normal distribution.

[0105] The laser cladding parameters are selected as follows: the power of laser cladding is 3000 W, the scanning power of laser cladding is 20 mm / s, the overlapping amount of the laser cladding is 59%, and the spot size of the laser cladding is 4.5 mm.

[0106] Cracking occurred in the cladding layer during the cladding process.

[0107] Comparative Example 3

[0108] The difference between this comparative example and Example 1 is that:

[0109] The Fe-based high-hard alloy powder + ceramic particle system for laser cladding in this comparative example is composed of Fe-based high-hardness alloy powder and ceramic particles. Among them, the chemical composition mass fractions of the Fe-based high-hard alloy powder are:

[0110] Cr: 16.25%

[0111] Mn: 0.6%

[0112] C: 0.25%

[0113] Si: 1.65%

[0114] V: 0.25%

[0115] Ni: 0.33%

[0116] Fe: the balance.

[0117] Among them, the ceramic particles are TiC particles, the added mass fraction is 10%, and the sizes of the Fe-based high-hard alloy powder and the ceramic particles are selected to be 50 μm to 150 microns, with a normal distribution.

[0118] The parameters of laser cladding are selected as follows: the power of laser cladding is 2200 W, the scanning speed of laser cladding is 28 mm / s, the overlapping amount of the laser cladding is 59%, and the spot size of the laser cladding is 4.5 mm.

[0119] The hardness of the cladding layer formed by laser cladding is 60 HRC.

[0120] In addition, one or more technical solutions in the embodiments of the present application at least have the following technical effects or advantages:

[0121] In the embodiments of the present application, the added alloying elements can form a high-hardness structural alloy with Fe, and the hardness value reaches more than 64 HRC. The added TiC ceramic particles can improve the wear resistance of the cladding layer.

[0122] In the embodiments of the present application, according to the demand for wear resistance, TiC ceramic particles with a maximum mass fraction of 50% can be added on the basis of Fe-based high-hard alloy powder. Under the laser cladding parameters of the embodiments of the present application, the formability of the cladding layer is good, and there are no macroscopic defects after cladding.

[0123] In the embodiments of the present application, a Fe-based high-hard alloy powder + ceramic particle system developed for laser cladding can be used to perform laser cladding on the surface of ultra-high carbon steel and high-alloy steel with a carbon content exceeding 1.5, and the surface quality of the cladding layer is good without macroscopic defects.

[0124] The above are only the specific embodiments of the present application, which enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features claimed herein.

Claims

1. A ferrous-based high-hard alloy powder for laser cladding. In terms of mass fraction, the ceramic particle-reinforced ferrous-based high-hard alloy powder is composed of the following chemical components: The iron-based alloy powder material is ≥50%, and the ceramic particle material is ≤50%.

2. The iron-based high-hardness alloy powder according to claim 1, wherein By mass fraction, the ceramic particle-reinforced iron-based high-hard alloy powder is composed of the following chemical components: the iron-based alloy powder material is ≥50%, and the ceramic particle material is >0 and ≤50%.

3. The iron-based high-hardness alloy powder according to claim 2, wherein, By mass fraction, the iron-based alloy powder material consists of the following chemical components as follows: Cr: 12% - 20%, Ni: 0.1% - 2%, Mn: 0.3% - 1%, C: 0.1% - 0.4%, Si: 1% - 2%, V: 0.1% - 0.4%, and the balance is Fe.

4. The iron-based high-hardness alloy powder according to claim 3, characterized in that, By mass fraction, the iron-based alloy powder material consists of the following chemical components as follows: Cr: 16.25%, Mn: 0.6%, C: 0.25%, Si: 1.65%, V: 0.25%, Ni: 0.33%, and the balance is Fe; or By mass fraction, the iron-based alloy powder material consists of the following chemical components as follows: Cr: 18%, Mn: 1%, C: 0.3%, Si: 1.0%, V: 0.1%, Ni: 0.2%, and the balance is Fe.

5. The iron-based high-hardness alloy powder according to claim 4, wherein The size of the iron-based high-hard alloy powder is 50μm - 150μm and shows a normal distribution.

6. The iron-based high-hardness alloy powder according to claim 2, wherein The ceramic particle material is TiC ceramic particles.

7. The iron-based high-hardness alloy powder according to claim 6, wherein The size of the ceramic particle material is 50μm - 150μm and shows a normal distribution.

8. Application of the iron-based high-hard alloy powder according to any one of claims 1 - 7, wherein the ceramic particle-reinforced iron-based high-hard alloy powder is used for laser cladding.

9. The application according to claim 8, wherein The laser cladding satisfies the following conditions: the power is 2400W - 3400W, the scanning speed is 16mm / s - 25mm / s, the overlap amount is 58% - 62%, and the spot size is 3.5mm - 5.5mm.

10. The application according to claim 8, wherein The hardness of the laser cladding layer formed by the laser cladding is ≥64HRC.

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