Wear-resistant alloy composition and application thereof

Abstract

The invention discloses a wear-resistant alloy composition and application. The wear-resistant alloy composition comprises 0.9 wt% to 2.65 wt% of C, 0.58 wt% to 1.35 wt% of Si, 0.31 wt% to 0.45 wt% of Mn, 6.5 wt% to 11.35 wt% of Cr, 0.25 wt% to 1.25 wt% of Mo, 7.15 wt% to 12.65 wt% of V and the balance Fe and inevitable impurities. Powder metallurgy is not needed, direct forming can be achieved through 3D printing, the heat treatment requirement is lower, operation is easy, a harsh heat treatment process is not needed, the obtained alloy has HRC63 or higher hardness, and the average friction coefficient at the normal temperature is only about 0.37. Moreover, the wear-resistant alloy composition is good in welding performance, and the problem that interlayer cracking occurs in the 3D printing or welding process or after the high-C-content alloy is solved.

Description

Technical Field

[0001] The invention relates to an alloy composition and application thereof, in particular to a wear-resistant alloy composition with an HRC hardness exceeding 60 and application thereof. Background Art

[0002] Wear-resistant alloys are alloys developed to improve the wear resistance of mechanical equipment and are the most commonly used alloys for some typical friction pairs. They need to have high hardness and wear resistance and are mainly used as tool steels (such as steel for rock drilling and crushing machinery), bearing steels, etc. At present, the main types of wear-resistant alloys include nickel-chromium alloys, high manganese alloys, tungsten carbide alloys, nickel-tungsten alloys, etc.

[0003] Powder metallurgy high-speed steel has uniform structure and fine grains, eliminating the inevitable segregation of molten cast high-speed steel. Therefore, it has higher toughness and wear resistance than molten cast high-speed steel of the same composition. It also has the advantages of small heat treatment deformation, good forging and grinding performance, etc., which improves the quality and performance of steel materials. When producing powder metallurgy high-speed steel, the raw materials are first melted into molten steel with stable composition, and then the high-speed steel molten steel is atomized by high-pressure inert gas or high-pressure water, forming fine high-speed steel grain powder instantly, and then vacuum sintering, pressure equalization treatment, annealing and hot forging processing.

[0004] American PM-9V is a high-performance powder metallurgy high-speed steel. It improves the toughness and thermal shock resistance of steel by reducing the carbon and vanadium content. It is suitable for use in situations where low-alloy tool steel and hot working tool steel require higher wear resistance. It is widely used in the manufacture of demanding tools and molds.

[0005] However, the heat treatment process of PM-9V is significantly different from that of common die steels, and the requirements for heat treatment are extremely high. The currently known heat treatment processes include vacuum heat treatment to obtain uniform organizational structure and fine grains, thereby obtaining good wear resistance and high strength, but the manufacturer has not clearly announced the details of its heat treatment process, and it is difficult for other manufacturers to obtain the corresponding wear resistance, strength and other properties. At present, the MP-9V products provided by the manufacturer are all finished plates, pipes, bars and other profiles, which are made into other products by cutting or machining. Therefore, it is still of great significance to find alternative high-wear-resistant alloys and their processing methods.

[0006] In addition, with the development of technologies such as 3D printing, alloys that can be adapted to 3D printing have received more and more attention. High C content can bring high strength and other properties, but it is generally believed in this field that C content exceeding 0.9% is not suitable for 3D printing or welding processes. Because 3D printing is a layer-by-layer molding method, alloys with such a high C content have poor welding performance and will experience interlayer cracking. Therefore, solving the weldability of high C content alloys is also a technical problem that this field has always hoped to solve. Summary of the invention

[0007] The present application proposes a wear-resistant alloy composition and application, in particular, an alloy composition with a high C content suitable for welding, preferably 3D printing (such as LMD, LENS 3D printing) and application thereof.

[0008] In a first aspect of the present application, a wear-resistant alloy composition is provided, which comprises the following components based on the total weight of the wear-resistant alloy composition:

[0009] C 0.9-2.65wt%,

[0010] Si 0.58-1.35wt%,

[0011] Mn 0.31-0.45wt%,

[0012] Cr 6.5-11.35wt%,

[0013] Mo 0.25-1.25wt%,

[0014] V 7.15-12.65wt%, the rest is Fe and unavoidable impurities.

[0015] In a preferred embodiment, based on the total weight of the wear-resistant alloy combination, the C content is preferably 1-2.5wt%, more preferably 1.25-2.3wt%, more preferably 1.5-2wt%, more preferably 1.65-1.8wt%.

[0016] In a preferred embodiment, based on the total weight of the wear-resistant alloy combination, the Si content is preferably 0.6-1.3wt%, more preferably 0.7-1.2wt%, more preferably 0.8-1.15wt%, more preferably 0.9-1wt%.

[0017] In a preferred embodiment, based on the total weight of the wear-resistant alloy combination, the Mn content is preferably 0.33-0.42wt%, more preferably 0.35-0.4wt%, and more preferably 0.36-0.38wt%.

[0018] In a preferred embodiment, based on the total weight of the wear-resistant alloy combination, the Cr content is preferably 6.7-11.2wt%, more preferably 6.9-11wt%, more preferably 7-10.5wt%, more preferably 7.2-10wt%, more preferably 7.5-9.5wt%, more preferably 7.7-9wt%, more preferably 8-9wt%.

[0019] In a preferred embodiment, based on the total weight of the wear-resistant alloy combination, the Mo content is preferably 0.3-1.22wt%, more preferably 0.35-1.2wt%, more preferably 0.38-1.18wt%, more preferably 0.4-1.15wt%, more preferably 0.45-1.1wt%, more preferably 0.5-1wt%, more preferably 0.6-0.9wt%, more preferably 0.7-0.8wt%.

[0020] In a preferred embodiment, based on the total weight of the wear-resistant alloy combination, the V content is preferably 7.2-12.6wt%, more preferably 7.5-12.5wt%, more preferably 7.8-12.3wt%, more preferably 8-12wt%, more preferably 8.2-12.8wt%, more preferably 8.5-12.5wt%, more preferably 8.7-12.2wt%, more preferably 9-12wt%, such as 9.5wt%, 10wt%, 10.5wt%, 11wt%, 11.5wt%, etc.

[0021] In a preferred embodiment, the wear-resistant alloy composition is a powder. More preferably, the average particle size of the powder can be selected according to 3D printing parameters, and is generally preferably 20-500 mesh, and more preferably 50-200 mesh.

[0022] In a preferred embodiment, the wear-resistant alloy composition is a wire (or silk thread), and the wire diameter can be selected according to the 3D printing parameters, and is generally preferably ≤5mm, more preferably ≤4mm, more preferably ≤3.5mm, for example, 1μm-3.5mm, more preferably 10μm-3mm, more preferably 20μm-2.5mm, more preferably 50μm-2mm, more preferably 100μm-1.7mm.

[0023] The second aspect of the present application is to provide an application of the wear-resistant alloy composition, or a method for processing and preparing an alloy using the wear-resistant alloy composition; including using a 3D printing process to shape the wear-resistant alloy composition on the surface of a substrate.

[0024] In a preferred embodiment, the substrate may be cast iron or other iron-based alloys, and is particularly preferably cast iron.

[0025] In a preferred embodiment, the 3D printing may be a directed energy deposition (DED) process, such as LMD or LENS.

[0026] More preferably, the application or method further comprises: performing a treatment to eliminate thermal stress and / or performing a tempering treatment after the forming, but the treatment to eliminate thermal stress and the tempering treatment are not essential.

[0027] In a preferred embodiment, the treatment to eliminate thermal stress refers to heat treatment at 150-300°C, more preferably heat treatment at 200-250°C.

[0028] In a preferred embodiment, in the treatment for eliminating thermal stress, the heat treatment time is preferably 1-6 hours, more preferably 2-5 hours, and more preferably 3-4 hours.

[0029] In a preferred embodiment, the tempering treatment may be selected or not. Preferably, the tempering treatment may be performed after the treatment for relieving thermal stress.

[0030] In a preferred embodiment, the substrate may be preheated before 3D printing, but preheating is not necessary. In the case of preheating, the substrate may be preheated to ≤200°C, more preferably ≤195°C, more preferably 160-195°C, more preferably 170-185°C.

[0031] In a preferred embodiment, the temperature of the tempering treatment is preferably ≥350°C, more preferably ≥400°C, more preferably 400-800°C, more preferably 450-750°C, more preferably 500-70°C, more preferably 520-680°C, such as 550°C, 580°C, 600°C, 620°C, 650°C.

[0032] In a preferred embodiment, the tempering treatment time is preferably ≥1 hour, more preferably ≥3 hours.

[0033] In a preferred embodiment, the 3D printing laser power of the LMD or LENS is preferably at least 1000W, preferably at least 1500W, more preferably at least 2000W, or at least 3000W, for example at least 4000W.

[0034] Preferably, the 3D printing cladding thickness of the LMD or LENS is preferably 0.01-3 mm / layer, more preferably 0.05-2.8 mm / layer, more preferably 0.1-2.5 mm / layer, more preferably 0.5-2.2 mm / layer, more preferably 0.8-2 mm / layer, more preferably 1-1.8 mm / layer, more preferably 1.2-1.5 mm / layer.

[0035] In a preferred embodiment, the cladding width of the 3D printing of the LMD or LENS is 0.05-5 mm, more preferably 0.1-4 mm, more preferably 0.5-3 mm, more preferably 1-2.5 mm, more preferably 1.5-2 mm.

[0036] In a preferred embodiment, the overlap range of the 3D printing of the LMD or LENS is controlled to be ≤2.5 mm, more preferably ≤2 mm, more preferably ≤1.8 mm, more preferably ≤1.5 mm, and more preferably ≤1.2 mm.

[0037] The wear-resistant alloy composition described in the present application can be a wire material. The 3D printing wire feeding speed can be determined according to the cladding thickness, and is generally preferably 0.1-5m / minute, more preferably 0.2-4.5m / minute, more preferably 0.4-4m / minute, more preferably 0.5-3.5m / minute, more preferably 0.7-3m / minute, more preferably 0.9-2.5m / minute, and more preferably 1-2m / minute.

[0038] The wear-resistant alloy composition described in the present application can be a powder material. The 3D printing powder feeding speed can be determined according to the cladding thickness, and is generally preferably 0.1-5g / minute, more preferably 0.5-4.5g / minute, more preferably 1-4g / minute, more preferably 1.5-3.8g / minute, more preferably 2-3.5g / minute, and more preferably 2.5-3k / minute.

[0039] Compared with PM-9V, the beneficial effects of this application are: no powder metallurgy is required, it can be directly formed through DED 3D printing, the heat treatment requirements are simpler and easier to operate, and no harsh heat treatment process is required.

[0040] Moreover, compared with general high-C content alloys, the wear-resistant alloy composition of the present application has good welding performance, and no interlayer cracking occurs during or after 3D printing or welding. Combined with the DED 3D process, the problem of interlayer cracking during or after 3D printing or welding caused by poor weldability of high-C content alloys is solved.

[0041] The alloy obtained in the present application has a hardness of HRC63 or higher, good wear resistance, and an average friction coefficient of only about 0.37 at room temperature.

[0042] Instruction Manual

[0043] Figure 1 The friction and wear test results of the wear-resistant alloy obtained in the present invention at room temperature are shown.

[0044] Figure 2 The friction and wear test results of the wear-resistant alloy obtained by the present invention at a temperature of 400°C.

[0045] Figure 3 Schematic diagram of the DED 3D printing process of the present invention. DETAILED DESCRIPTION

[0046] The present invention provides a wear-resistant alloy composition, in particular, an alloy composition that can be used for 3D printing, in particular, DED (direct energy deposition) 3D processes such as LMD and LENS, and a method for preparing the wear-resistant alloy composition. In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0047] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices. The term "at least" in the present invention means greater than or equal to.

[0048] C content is the main factor affecting the microstructure. C can form carbides with other elements, thereby increasing the hardness of the alloy. However, in general, a C content exceeding 0.9wt% is considered unsuitable for welding (surfacing, 3D printing, etc.) processes, because in this case the welding performance is poor and cracking occurs, especially in the case of 3D printing, where interlayer cracking is more likely to occur. The present invention utilizes a high C content and specifically matches it with other alloying elements to solve the problem of poor welding performance in the case of high C content. A highly wear-resistant and high-hardness alloy can be directly obtained by 3D printing, and the C content can reach 0.9-2.65wt%.

[0049] Si can refine the matrix structure, so an appropriate amount of Si can also improve hardness and wear resistance, but excessive silicon will reduce plasticity and toughness, and reduce processing performance, and it is easy to crack during 3D printing. Therefore, in this patent, the Si content is preferably controlled at 0.58-1.35wt%.

[0050] Mn can increase carbon penetration, thereby improving the wear resistance and hardness of alloy steel. However, Mn will deteriorate the welding performance of steel and cause cracks, which is not conducive to 3D printing, surfacing and other processes. In addition, brittleness, especially temper brittleness, will also increase significantly. In this patent, it is best to control the Mn content within 0.31-0.45wt%. Within this range, better hardness and wear resistance can be obtained, and the use of precious metals such as Mo can be reduced.

[0051] Mo can improve the hardenability of steel, refine the structure, and enhance the strength and hardness of steel, but Mo will promote decarburization, reduce the austenite phase area, appear ferrite phase, reduce toughness, and reduce thermal conductivity. At the same time, the price of Mo is very high. The Mo content in this patent is 0.25-1.25wt%. Through the combination of other elements such as Cr, Si, Mn, V, C, etc., the Mo content is controlled at a lower level, reducing the cost of wear-resistant alloys.

[0052] Cr can make carbon steel produce a passivation film of chromium iron oxide that is firmly bonded to the matrix structure in an oxidizing medium, thereby increasing wear resistance, corrosion resistance, etc., and Cr can reduce the alloy stacking fault energy. However, too high Cr content will lead to the precipitation of α-Cr. The Cr content of this patent is preferably controlled at 6.5-11.35wt% to control Cr to exist in the matrix in a solid solution state. At the same time, the compounding of Cr and Mo can reduce the use of Mo and reduce costs.

[0053] V can form hard and stable VC carbide particles, strengthen grain boundaries and intergranular spaces, and can also be used as a grain refiner to reduce grain size, improve toughness and heat treatment properties. However, the formation of VC will reduce the alloy degree, thereby reducing hardness. The V content of this patent is controlled at 7.15-12.65wt%. Within this range, V can form carbides with C and can be compounded with other elements to solve the cracking problem during 3D printing and welding, and reduce the amount of precious metals such as Mo.

[0054] The present application adopts a DED 3D printing process such as LMD or LENS to realize the 3D printing of the wear-resistant alloy composition. LMD is a laser melting deposition (Laser Metal Deposition) process, and LENS is a laser near-net shaping (Laser Engineered Net Shaping) process. Figure 3 DED 3D printing uses coaxial wire feeding powder materials. Taking powder as an example, during the molding process, the wear-resistant alloy composition powder 2 is uniformly gathered on the working plane of the workpiece 4 through the nozzle. At the same time, the laser beam 1 is coaxially coupled with the powder material for output, and the laser beam 1 is also gathered to the gathering point of the powder material. The laser beam 1 heats the surface of the workpiece 4 to form a molten pool 3. The wear-resistant alloy composition powder 2 is sprayed into the molten pool 3, cladding and accumulation, and the accumulated cladding entity can be obtained by moving the workbench or the nozzle. Unexpectedly, the wear-resistant alloy composition of this application, combined with the above-mentioned DED 3D printing process, solves the problem of poor weldability of high C (above 0.9wt%) alloys, but the composition cannot be used for SLM laser additive manufacturing because it is easy to crack and cannot be formed under the process conditions. The specific principle is not yet clear.

[0055] Example 1

[0056] In this embodiment, the wear-resistant alloy composition is a 200 mesh powder, and the weight composition is: C 0.95wt%,

[0057] Si 0.7wt%,

[0058] Mn 0.33wt%,

[0059] Cr 7wt%,

[0060] Mo 0.45wt%,

[0061] V 7.5wt%, the rest is Fe.

[0062] Taking #45 steel as the substrate, the wear-resistant alloy composition is formed into a wear-resistant alloy layer on the substrate surface by LMD process. The LMD process is as follows:

[0063] The wear-resistant alloy composition is covered on the surface of the substrate, and the wear-resistant alloy composition is sintered by LMD process to form a wear-resistant alloy layer. The LMD cladding width is 1mm, the laser power is 3000W, the overlap is 0.8mm, and the cladding thickness of each layer is 1.5mm.

[0064] Heat treatment at 200℃ for 2h eliminates thermal stress.

[0065] Example 2

[0066] In this embodiment, the wear-resistant alloy composition is a welding wire with a diameter of 1.75 mm and a weight composition of: C 1.45 wt%,

[0067] Si 1.07wt%,

[0068] Mn 0.35wt%,

[0069] Cr 7.5wt%,

[0070] Mo 0.35wt%,

[0071] V 8.5wt%, the rest is Fe.

[0072] Taking #45 steel as the substrate, the wear-resistant alloy composition is formed into a wear-resistant alloy layer on the substrate surface by LMD process. The LMD process is as follows:

[0073] Preheat the substrate to 180°C.

[0074] The wear-resistant alloy composition is covered on the substrate surface, and the wear-resistant alloy composition is sintered by LMD process to form a wear-resistant alloy layer. The LMD cladding width is 2mm, the laser power is 2500W, the overlap is 1mm, and the cladding thickness of each layer is 1.5mm.

[0075] Heat treatment at 200℃ for 3h eliminates thermal stress.

[0076] Example 3

[0077] In this embodiment, the wear-resistant alloy composition is a 200 mesh powder, and the weight composition is: C 2.25wt%,

[0078] Si 0.63wt%,

[0079] Mn 0.38wt%,

[0080] Cr 7.7wt%,

[0081] Mo 0.39wt%,

[0082] V 8.2wt%, the rest is Fe.

[0083] With #45 steel as the substrate, the wear-resistant alloy composition is formed into a wear-resistant alloy layer on the substrate surface by the LENS process. The LENS process is as follows:

[0084] The wear-resistant alloy composition is covered on the surface of the substrate, and the wear-resistant alloy composition is sintered by LENS process to form a wear-resistant alloy layer. The LMD cladding width is 2mm, the laser power is 2000W, the overlap is 1.2mm, and the thickness of each cladding layer is 1.5mm.

[0085] Heat treatment at 200℃ for 2h eliminates thermal stress.

[0086] Table 1. Hardness test results of alloys obtained in Examples 1-3

[0087]

[0088] It can be seen that this application can achieve the hardness of MP-9V without special heat treatment process, and the processing technology is simpler. Moreover, in the case of multi-layer 3D printing, it can also maintain its hardness without cracking problems, and has a good combination with the #45 steel matrix, solving the problem of poor welding performance of high C alloys.

[0089] Example 4

[0090] In this embodiment, the wear-resistant alloy composition is 150 mesh powder, and the weight composition is: C 1.55wt%,

[0091] Si 1.23wt%,

[0092] Mn 0.41wt%,

[0093] Cr 9.2wt%,

[0094] Mo 0.42wt%,

[0095] V 8.5wt%, the rest is Fe.

[0096] Taking GGG70L steel as the substrate, the wear-resistant alloy composition is formed into a wear-resistant alloy layer on the substrate surface by the LENS process. The LENS process is as follows:

[0097] The wear-resistant alloy composition is covered on the surface of the substrate, and the wear-resistant alloy composition is sintered by LENS process to form a wear-resistant alloy layer. The LENS cladding width is 1.5mm, the laser power is 2000W, the overlap is 1.2mm, and the thickness of each cladding layer is 1.3mm.

[0098] Heat treatment at 200℃ for 3h eliminates thermal stress.

[0099] Example 5

[0100] In this embodiment, the wear-resistant alloy composition is 250 mesh powder, and the weight composition is: C 1.75wt%,

[0101] Si 0.91wt%,

[0102] Mn 0.36wt%,

[0103] Cr 7.7wt%,

[0104] Mo 0.32wt%,

[0105] V 12.3wt%, the rest is Fe.

[0106] Taking GGG70L steel as the substrate, the wear-resistant alloy composition is formed into a wear-resistant alloy layer on the substrate surface by LMD process. The LMD process is as follows:

[0107] The wear-resistant alloy composition is covered on the surface of the substrate, and the wear-resistant alloy composition is sintered by LMD process to form a wear-resistant alloy layer. The LMD cladding width is 2.2 mm, the laser power is 1500 W, the overlap is 1.3 mm, and the cladding thickness of each layer is 1.5 mm.

[0108] Example 6

[0109] In this embodiment, the wear-resistant alloy composition is a 200 mesh powder, and the weight composition is: C 1.21wt%,

[0110] Si 0.77wt%

[0111] Mn 0.33wt%,

[0112] Cr 10.2wt%,

[0113] Mo 0.36wt%,

[0114] V 10.3wt%, the rest is Fe.

[0115] Taking GGG70L steel as the substrate, the wear-resistant alloy composition is formed into a wear-resistant alloy layer on the substrate surface by LMD process. The LMD process is as follows:

[0116] The wear-resistant alloy composition is covered on the substrate surface, and the wear-resistant alloy composition is sintered by LMD process to form a wear-resistant alloy layer. The LMD cladding width is 1.8mm, the laser power is 3000W, the overlap is 1.2mm, and the cladding thickness of each layer is 1.6mm.

[0117] Heat treatment at 200℃ for 3h eliminates thermal stress.

[0118] Table 2, hardness test results of alloys obtained in Examples 3-6

[0119]

[0120] It can be seen that 3D printing on the GGG70L steel substrate can also achieve a hardness comparable to MP-9V, and does not require special heat treatment processes. At the same time, it has good bonding with the substrate and good welding performance. Multi-layer 3D printing does not crack and maintains its good hardness, solving the problem of poor welding performance of high C alloy steel.

[0121] Example 7

[0122] In this embodiment, the wear-resistant alloy composition is a 200 mesh powder, and the weight composition is:

[0123] C 1.15wt%,

[0124] Si 0.82wt%,

[0125] Mn 0.35wt%,

[0126] Cr 8.5wt%,

[0127] Mo 0.35wt%,

[0128] V 9.5wt%, the rest is Fe.

[0129] The LMD process is used to form a wear-resistant alloy layer on the surface of the substrate with the wear-resistant alloy composition. The LMD process is: covering the wear-resistant alloy composition on the surface of the supporting structure, sintering the wear-resistant alloy composition by the LMD process to form a wear-resistant alloy layer, the LMD cladding width is 2mm, the laser power is 3000W, the overlap is 1.2mm, and the thickness of each cladding layer is 1.5mm.

[0130] The obtained wear-resistant alloy was subjected to friction and wear tests, including friction and wear tests at room temperature (25°C) and high temperature (400°C).

[0131] Table 3, Friction and wear test results

[0132]

[0133] Through Table 3 and Figure 1 , Figure 2 It can be seen that the wear-resistant alloy obtained by the present invention has an average friction coefficient of only about 0.37 at room temperature and an average friction coefficient of only about 0.26 at high temperature, and has very good wear resistance.

[0134] In summary, this application does not require the powder metallurgy processing and special heat treatment process of MP-9V, and adopts the already popular DED 3D printing process to obtain hardness and wear resistance comparable to MP-9V, with simple processing technology and easier operation. In addition, this application solves the problem of poor weldability and easy cracking of high-C content alloys through specific element ratios, and can realize the welding and 3D printing of high-hardness and high-wear-resistant alloy steels.

[0135] The products obtained in the above embodiments of the present application may also be subjected to tempering treatment to further improve some mechanical properties, such as toughness.

[0136] The specific embodiments of the present invention are described in detail above, but they are only examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions made to the present invention are also within the scope of the present invention. Therefore, the equalization changes and modifications made without departing from the spirit and scope of the present invention should be included in the scope of the present invention.

Claims

1. A wear-resistant alloy composition, characterized in that: include: Based on the total weight of the wear-resistant alloy combination, it includes the following components: C 0.9-2.65wt%, Si 0.58-1.35wt%, Mn 0.31-0.45wt%, Cr 6.5-11.35wt%, Mo 0.25-1.25wt%, V 7.15-12.65wt%, The rest is Fe and inevitable impurities.

2. The wear-resistant alloy composition according to claim 1, characterized in that: Based on the total weight of the wear-resistant alloy combination, the C content is preferably 1-2.5wt%, more preferably 1.25-2.3wt%, more preferably 1.5-2wt%, more preferably 1.65-1.8wt%.

3. The wear-resistant alloy composition according to claim 1, characterized in that: Based on the total weight of the wear-resistant alloy combination, the Si content is preferably 0.6-1.3wt%, more preferably 0.7-1.2wt%, more preferably 0.8-1.15wt%, more preferably 0.9-1wt%.

4. The wear-resistant alloy composition according to claim 1, characterized in that: Based on the total weight of the wear-resistant alloy combination, the Mn content is preferably 0.33-0.42wt%, more preferably 0.35-0.4wt%, and more preferably 0.36-0.38wt%.

5. The wear-resistant alloy composition according to claim 1, characterized in that: Based on the total weight of the wear-resistant alloy combination, the Cr content is preferably 6.7-11.2wt%, more preferably 6.9-11wt%, more preferably 7-10.5wt%, more preferably 7.2-10wt%, more preferably 7.5-9.5wt%, more preferably 7.7-9wt%, more preferably 8-9wt%.

6. The wear-resistant alloy composition according to claim 1, characterized in that: Based on the total weight of the wear-resistant alloy combination, the Mo content is preferably 0.3-1.22wt%, more preferably 0.35-1.2wt%, more preferably 0.38-1.18wt%, more preferably 0.4-1.15wt%, more preferably 0.45-1.1wt%, more preferably 0.5-1wt%, more preferably 0.6-0.9wt%, more preferably 0.7-0.8wt%.

7. The wear-resistant alloy composition according to claim 1, characterized in that: Based on the total weight of the wear-resistant alloy combination, the V content is preferably 7.2-12.6wt%, more preferably 7.5-12.5wt%, more preferably 7.8-12.3wt%, more preferably 8-12wt%, more preferably 8.2-12.8wt%, more preferably 8.5-12.5wt%, more preferably 8.7-12.2wt%, more preferably 9-12wt%, such as 9.5wt%, 10wt%, 10.5wt%, 11wt%, 11.5wt%.

8. The wear-resistant alloy composition according to claim 1, characterized in that: The wear-resistant alloy composition is a powder or a wire. More preferably, the average particle size of the powder is preferably 20-500 mesh, more preferably 50-200 mesh; more preferably, the wire diameter is ≤5 mm, more preferably ≤4 mm, more preferably ≤3.5 mm, for example, 1 μm-3.5 mm, more preferably 10 μm-3 mm, more preferably 20 μm-2.5 mm, more preferably 50 μm-2 mm, more preferably 100 μm-1.7 mm.

9. An application of the wear-resistant alloy composition according to claim 1, characterized in that: include: The wear-resistant alloy composition is formed on the surface of a substrate by using a 3D printing process.

10. The use according to claim 9, characterized in that: The 3D printing is selected from DED process, for example, it can be selected from SLM, LENS; Preferably, the 3D printing laser power of the LMD or LENS is at least 1000W, preferably at least 1500W, more preferably at least 2000W, or at least 3000W, for example at least 4000W; Preferably, the 3D printing cladding thickness of the LMD or LENS is 0.01-3 mm / layer, more preferably 0.05-2.8 mm / layer, more preferably 0.1-2.5 mm / layer, more preferably 0.5-2.2 mm / layer, more preferably 0.8-2 mm / layer, more preferably 1-1.8 mm / layer, more preferably 1.2-1.5 mm / layer; Preferably, the cladding width of the 3D printing of the LMD or LENS is 0.05-5 mm, more preferably 0.1-4 mm, more preferably 0.5-3 mm, more preferably 1-2.5 mm, more preferably 1.5-2 mm; Preferably, the overlap range of the 3D printing of the LMD or LENS is controlled to be ≤2.5 mm, more preferably ≤2 mm, more preferably ≤1.8 mm, more preferably ≤1.5 mm, more preferably ≤1.2 mm.

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