High-performance superhard wear-resistant material as well as preparation method and application thereof

Abstract

The invention belongs to the field of material science and engineering, and particularly relates to a high-performance superhard wear-resistant material as well as a preparation method and application thereof. The material is a spray forming alloy designed based on a high-vanadium high-speed steel system, and the high-performance superhard wear-resistant material comprises the following chemical components in percentage by mass: 3.0-4.0% of C; 4.3% to 4.8% of W; 2.7% to 3.1% of Mn; 6.0%-6.8% of Cr; mo: 4.2%-5.2%; v: 5.7%-6.9%; 0.1% to 0.2% of Nb; and the ratio of V to C is (1.5-1.8), the ratio of V to C is (1.5-1.8), and the balance is Fe and inevitable impurities. The preparation method comprises the steps of vacuum melting, high-pressure nitrogen spray forming and optimized heat treatment. The obtained material is uniform in structure, the average size of carbides is 0.5-2 microns, and the distribution uniformity is gt; compared with traditional high-speed steel, the wear resistance of the high-speed steel material is improved by 60-80%, the service life is prolonged by 2-3 times, and the high-speed steel material can be widely applied to the fields of high-temperature and high-speed cutting tools, molds and additive manufacturing powder.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of material science and engineering, and specifically relates to a high-performance superhard wear-resistant material, a preparation method thereof and application thereof. BACKGROUND

[0002] High speed steel (HSS) is a high-alloy tool steel that is widely used in cutting tools, dies, and mechanical parts due to its excellent hardness, wear resistance, and high-temperature red hardness. Traditional high speed steels, such as M2 steel with a vanadium content of about 1.75-2.25%, have been improved in performance by adding tungsten, molybdenum, and vanadium to form hard carbides. However, with the rapid development of advanced manufacturing and green energy industries (such as electric vehicle manufacturing and wind power equipment processing) by 2025, the demand for high-performance tool steel has surged, and traditional high speed steels have limitations in high-temperature oxidation resistance and microstructure uniformity. Current material science hotspots include: (1) spray forming technology to refine grains and carbides; (2) high vanadium content to optimize carbide distribution and improve wear resistance; (3) sustainable alloy design to reduce the use of rare elements (such as tungsten) to reduce costs and environmental impact. Market forecasts show that the high-performance high speed steel market will grow from about $280 million in 2025 to $450 million in 2032, driven by high-efficiency cutting and additive manufacturing demand. In existing technologies, the vanadium content of superhard wear-resistant materials is usually less than 3%, and the carbides are prone to coarsening at high temperatures, leading to performance degradation. This application develops a new type of superhard wear-resistant material, high-vanadium high-speed steel, with uniform microstructure, significantly improved wear resistance and oxidation resistance, by increasing vanadium content and combining spray forming and optimized heat treatment.

[0003] Chinese patent CN102319897B (A manufacturing method of a spray-formed high-vanadium high-speed steel composite roller) and Chinese patent CN104878301B (Spray-formed high-speed steel) prepare high-vanadium high-speed steel composite rollers or high-speed steel by spray forming, but the vanadium content range is wide (usually 4-10%), Nb / Co micro-alloying is not precisely optimized, and the preparation process relies on conventional spray forming without specifying high-pressure nitrogen atomization (2-4 MPa) and deposition temperature (800-1000℃), resulting in low carbide distribution uniformity (<95%), easy segregation, and inability to achieve the microstructure characteristics of this application (carbide average size 0.5-2μm, no coarse segregation in martensitic matrix).

[0004] Foreign patents US10233519B2 (Spray-formed high-speed steel) and US4519839 (Sintered high vanadium high speed steel and method of making same) prepared high vanadium (about 4-7%) high speed steel by spray forming or powder metallurgy sintering, but the vanadium content is not accurate to 5.7-6.9%, without Nb / Co addition to optimize the grain boundary strength, and the heat treatment parameters (such as quenching temperature <1200℃) are lower than this application (quenching at 1200-1250℃ + three times tempering at 550-600℃), which cannot achieve impact toughness >18J / cm 2 and oxidation weight gain rate <4mg / cm 2 at 700℃.

[0005] Investigation on microstructure, mechanical properties, and tribological behaviors of spray-formed high-vanadium high-speed steel after heat treatment (Surface Science and Technology, 2024) discloses the microstructure, mechanical and tribological properties of spray-formed high-vanadium high-speed steel after heat treatment, with optimized quenching at 1150℃ + tempering at 560℃, MC carbide ~28%, hardness 709HV, but the vanadium content and heat treatment parameters are not accurately matched with this application (V: 5.7-6.9%, higher heat treatment temperature), the wear resistance and friction coefficient performance are slightly inferior, and the impact toughness >18J / cm 2 of this application cannot be achieved.

[0006] Revealing the oxidation mechanism of high vanadium high-speed steel using multi-scale characterization (Corrosion Science, 2023-10) mainly analyzes the microstructure evolution of high vanadium high speed steel oxidation at 500-700℃, and reveals the three-layer oxidation structure (Cr2O3 inner layer, Fe3O4 outer layer) and oxidation model, but only focuses on the oxidation behavior, without involving specific component optimization or spray forming preparation, and cannot achieve the oxidation weight gain rate <4mg / cm 2 of this application.

[0007] Although the existing patent and non-patent literatures involve high-vanadium high-speed steel and spray forming, the precise chemical composition (V: 5.7-6.9%, Nb: 0.1-0.2%, Co: 0.3-0.4%, etc., which is realized by substituting part of W / Mo with high-vanadium to achieve sustainable alloying), microstructure (carbide size 0.5-2 μm, uniformity >95%, no coarse segregation) and preparation method (vacuum melting + high-pressure nitrogen gas atomization spray forming + optimized heat treatment) of the unique combination of the present application are not disclosed. The technology significantly improves the wear resistance (more than 35%), impact toughness (>18 J / cm 2 ) and high-temperature oxidation resistance (700℃<4 mg / cm 2 ), compared with traditional M2 steel, the hardness is increased by 10-20%, and the wear rate is reduced by 60-80%, filling the gap of high-performance super-hard wear-resistant materials in the field of cutting tools and additive manufacturing. SUMMARY

[0008] The purpose of the present application is to provide a high-performance super-hard wear-resistant material, its preparation method and use, which has higher wear resistance, high-temperature hardness and oxidation resistance, and is suitable for cutting tools and additive manufacturing powders.

[0009] According to the first aspect of the present application, a high-performance super-hard wear-resistant material is provided, which comprises the following chemical components in mass percentage: C: 3.0%-4.0%; W: 4.3%-4.8%; Mn: 2.7%-3.1%; Cr: 6.0%-6.8%; Mo: 4.2%-5.2%; V: 5.7%-6.9%; Nb: 0.1%-0.2%; Co: 0.3%-0.4%, the balance being Fe and unavoidable impurities, and the V / C ratio is 1.5-1.8. The microstructure of the material is composed of MC type and M7C3 type carbides dispersedly distributed, the average size of the carbides is 0.5-2 μm, the distribution uniformity is >95%, and the matrix is fine needle-like martensite without coarse segregation.

[0010] Based on the above technical solution, M in the MC type carbide is selected from at least one of V, Nb and Mo, and the volume fraction of the carbide is 25-30%.

[0011] Based on the above technical solution, the room temperature microhardness of the material is 900-980 HV, the compressive strength is 3000-3400 MPa, and the impact energy is ≥18 J / cm 2 .

[0012] Based on the above technical solution, the hot hardness retention rate of the material at 550℃ is ≥70%, and the oxidation weight gain rate at 700℃ is <4 mg / cm 2 .

[0013] According to a second aspect of the present invention, a method for preparing a high-performance superhard wear-resistant material is provided, comprising the following steps: Step 1, Weighing raw materials: Weigh high-purity raw materials according to the specified ratio, wherein the purity of the raw materials is ≥99.9%; Step 2, Vacuum melting: Vacuum melting at 1600-1700℃ and vacuum degree <10 Pa for 30-60 min; Step 3, spray deposition: use 2-4 MPa high-pressure nitrogen atomization spray to form the shape, and deposit at 800-1000℃ for 60-90 min; Step 4, oil extraction: After austenitizing the obtained spray-deposited billet at 1200-1250℃ for 30-45 min, immediately oil quench it to 200-250℃; Step 5, tempering treatment: Perform tempering treatment three times in sequence, each time at a tempering temperature of 570℃ for 2 hours. After each tempering, air cool the air at a cooling rate of 15~25℃ / min.

[0014] Based on the above technical solution, the spray forming cooling rate in step 3 is 10. 3 -10 4 K / s, to suppress carbide coarsening and improve tissue uniformity.

[0015] Based on the above technical solution, the oil quenching in step 4 uses medium-speed quenching oil with an oil temperature of 45~55℃ and is cooled under stirring to ensure a uniform cooling rate of 50~100℃ / min. According to a third aspect of the invention, an application of a high-performance superhard wear-resistant material is provided, which is used to manufacture high-speed cutting tools, molds or additive manufacturing powders for cutting and forming processes under high temperature (>700°C) and high load conditions.

[0016] Beneficial effects (1) Compared with traditional high-speed steel, the ultra-hard wear-resistant material of the present invention exhibits improvements in multiple performance indicators. In terms of mechanical properties, while maintaining high hardness and compressive strength, the material significantly improves wear resistance, reduces wear rate significantly, and has a lower coefficient of friction, thereby extending service life. In terms of toughness, its impact toughness and fracture toughness are improved compared with traditional high-speed steel, achieving a better match between strength and toughness. In terms of microstructure, the ultra-hard wear-resistant material has a high proportion of dispersed MC-type carbides, with finer and more uniform carbide particle size, and a lower content of retained austenite, thus enhancing microstructure stability. In summary, the material can provide superior comprehensive performance compared to traditional high-speed steel under high load and high temperature wear conditions.

[0017] (2) When comparing the typical properties of conventional high-speed steel (such as M2) under conventional heat treatment (quenching + multiple tempering, target hardness of about HRC 63±2) as reported in publicly available research, the room temperature microhardness of conventional high-speed steel is about 820-880 HV, the compressive strength is about 2600-3000 MPa, and the impact energy is about 8-15 J·cm -2 The hot hardness at 550℃ is approximately 450-520 HV, with a hardness retention rate of approximately 55-65%; in dry friction sliding wear (load 300 N, speed 0.1 m·s)... -1 Under conditions of a sliding distance of 10 mm and Si3N4 mating parts, the specific wear rate is typically (1-5)×10⁻⁶. -5 mm 3 ·N -1 ·m -1 The average coefficient of friction is 0.50-0.65. In comparison, under the same heat treatment and testing conditions, the ultrahard wear-resistant material of this invention exhibits a room temperature microhardness of 900-980 HV (an increase of approximately 10-20%), a compressive strength of 3000-3400 MPa (an increase of approximately 10-15%), and an impact energy (same notch type) of 12-20 J·cm. -2 (Increased by approximately 20-40%); hot hardness at 550℃ ≥600 HV, hardness retention ≥70% (increased by approximately 10-15 percentage points); under the above wear conditions, the specific wear rate decreases to (3-8)×10 -6 mm 3 ·N -1 ·m -1 (Reduced by approximately 60-80%), with an average coefficient of friction of 0.45-0.55 (reduced by approximately 10-20%). Accordingly, the material of this invention achieves improvements in hardness and wear resistance while also maintaining toughness and high-temperature stability, resulting in a more balanced overall performance. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the vacuum melting furnace used in Embodiments 1-6 of the present invention (1-induction coil; 2-raw material; 3-induction heating; 4-mold; 5-water cooling device). Figure 2 The microstructure morphology of the novel superhard wear-resistant material prepared in Example 6 of this invention in its as-cast state; Figure 3 The microstructure morphology of the novel superhard wear-resistant material prepared in Example 6 of this invention in the tempered state; Figure 4 The scanning energy spectrum of M7C3 in the novel superhard wear-resistant material prepared in Example 6 of this invention; Figure 5 The scanning energy spectrum of MC in the novel superhard wear-resistant material prepared in Example 6 of this invention; Figure 6 The hardness and compressive strength of the steel obtained from the materials prepared in Example 6 and Comparative Examples 1-3 of this invention are shown. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] The present invention provides a high-performance superhard wear-resistant material in the specific embodiments section. The chemical composition of the high-performance superhard wear-resistant material is as follows by mass percentage: C: 3.0%-4.0%; W: 4.30%-4.80%; Cr: 6.0%-6.8%; Mo: 4.2%-5.2%; V: 5.7%-6.9%; Nb: 0.1%-0.2%; Co: 0.3%-0.4%; the remainder is Fe and unavoidable impurities, wherein the V / C ratio is 1.5-1.8.

[0021] The functions of the above elements are as follows: C: Forms hard carbides, providing a source of matrix reinforcement; W: Forms M6C-type carbides with Mo, improving red hardness and high-temperature strength; Mo: refines carbides and enhances tempering stability; Cr: Promotes the formation of Cr7C3, improving corrosion resistance and oxidation resistance; V: Generates fine MC carbides, significantly improving wear resistance; Nb: Forms stable NbC carbides, inhibiting grain growth; Co: Strengthens the matrix and improves high-temperature strength and resistance to tempering softening; V / C: A V / C ratio of 1.5-1.8 controls the volume fraction and distribution uniformity of carbides, maintaining good toughness.

[0022] Based on the above technical solution, the microstructure of the superhard wear-resistant material is composed of carbides, which include VC and MC, wherein M in MC is selected from at least one of Cr, W and Fe; The carbides have an average size of 0.5-2µm, a distribution uniformity of >95%, and no coarse segregation in the martensitic matrix.

[0023] Based on the above technical solution, the impact toughness of the superhard wear-resistant material is >18 J / cm. 2 Oxidation weight gain at 700℃ <4mg / cm³2 .

[0024] The present invention also provides a method for preparing a high-performance superhard wear-resistant material in the specific embodiments section, the preparation method comprising the following steps: Step 1, Raw material preparation: Weigh the high-purity raw materials according to the formula; Step 2, Vacuum melting: Place the high-purity raw material weighed in Step 1 into a vacuum furnace, and heat it at a temperature of 1600-1700℃ and a vacuum degree of <10Pa for 30-60 minutes to obtain a melt with an oxygen content of ≤0.002 wt.%. Step 3, Spray Molding: The melt obtained in Step 2 is atomized using nitrogen gas at a pressure of 2-4 MPa, and deposited at a temperature of 800-1000℃ for 60-90 min to obtain a dense and uniformly structured spray-deposited preform. The average cooling rate is controlled at 10°C throughout this process. 3 -10 4 K / s, to ensure carbide refinement and prevent elemental segregation.

[0025] Step 4, heat treatment: Heat the spray-formed blank obtained in Step 3 to 1200-1250℃ for austenitization, holding for 30-45 min to ensure uniform composition and complete the required carbide dissolution / transformation; then immediately perform oil quenching at an oil temperature of 45-55℃, using stirred oil cooling to reduce the sample to ≤200-250℃ within 5-30 min (the specific time depends on the workpiece size and the cooling capacity of the oil bath), at a cooling rate of 50-100℃ / min, to obtain a fine acicular martensite structure. It is recommended to use quenching oil with a medium cooling rate and maintain stirring to ensure uniform cooling. After quenching, a first tempering should be performed within 30 min to reduce internal stress and stabilize the microstructure.

[0026] Based on the above technical solution, the tempering treatment in step 4 includes three stages, specifically: the first tempering promotes the dispersion and precipitation of supersaturated carbon in martensite, reducing the content of retained austenite; the second tempering promotes the re-precipitation and refinement of MC-type carbides (mainly VC), enhancing wear resistance; the third tempering further stabilizes the matrix structure, improves the resistance to tempering softening and overall toughness. Each tempering temperature is 570℃ and the time is 2 hours. After each tempering, air cooling is performed at a rate of 15-25℃ / min.

[0027] The present invention also provides an application of high-performance superhard wear-resistant material in the preparation of cutting tools (such as milling cutters and drill bits) and additive manufacturing powders, which is suitable for high-temperature cutting (>700℃) and precision machining.

[0028] Example In the embodiments and comparative examples of this invention, raw materials were weighed according to the proportions in Table 1, and the weighed raw materials were placed in a vacuum furnace for melting, spray molding, and heat treatment to obtain a high-performance superhard wear-resistant material. Specific parameters related to vacuum melting and spray molding are shown in Table 2, parameters related to heat treatment are shown in Table 3, and the properties of the high-performance wear-resistant material are shown in Table 4. A simplified schematic diagram of the vacuum furnace is shown below. Figure 1 As shown in Figure 2 (where 1 is the induction coil; 2 is the raw material; 3 is the induction heating; 4 is the mold; and 5 is the water cooling device), the as-cast microstructure of the superhard wear-resistant material prepared in Example 6 is shown in Figure 2, and the tempered microstructure of the superhard wear-resistant material prepared in Example 6 is shown in Figure 5. Figure 3 As shown, the energy dispersive spectroscopy spectra of M7C3 and MC in the superhard wear-resistant material carbide prepared in Example 6 are as follows: Figure 4 , 5 As shown, the high-performance superhard wear-resistant materials prepared in Example 6 and Comparative Examples 1-3 (comparative Examples 1-3 being tungsten-based high-speed steel, molybdenum-containing high-speed steel, and molybdenum-based high-speed steel, respectively) exhibit the following properties when used in high-speed steel: Figure 6 As shown.

[0029] Table 1 Raw material proportions (wt.%)

[0030] Table 2. Parameters related to vacuum melting and spray molding

[0031] Table 3 lists the parameters related to heat treatment.

[0032] Table 4 Performance of High-Performance Wear-Resistant Materials

[0033] Specific wear rate conditions: dry friction sliding wear (load 300N, velocity 0.1 m·s) -1 (Sliding distance 10 mm, Si3N4 mating parts) As can be seen from the above embodiments and comparative examples, the high-performance superhard wear-resistant material of the present invention has significant technical advantages in terms of composition design and process control.

[0034] Firstly, in terms of composition design, this invention, by increasing the vanadium content to 5.7–6.9 wt.% and optimizing the Mo content (4.2–5.2 wt.%), forms a high proportion of fine and uniformly distributed MC-type carbides (average size 0.5–2 μm), effectively improving wear resistance and high-temperature hardness. The trace addition of Nb and Co further inhibits grain growth and enhances the high-temperature strength and tempering resistance of the matrix. Compared to the comparative steel, the carbide distribution uniformity is increased from approximately 85% to >95%, and the microstructure is significantly refined.

[0035] Secondly, in terms of process control, this invention adopts a preparation path combining vacuum melting and high-pressure nitrogen spray forming, controlling the melt oxygen content to ≤0.002wt.%, the spray pressure to 2-4MPa, and the deposition temperature to 800-1000℃, achieving rapid solidification and homogenized microstructure. Compared with traditional cast or powder metallurgy methods, this process significantly reduces elemental segregation and carbide coarsening. The optimized heat treatment regime (austenitization at 1200-1250℃ for 30-45 min, followed by oil quenching and three tempering processes at 570℃ for 2 h followed by air cooling) ensures dispersed carbide precipitation and stable transformation of retained austenite, giving the material both high hardness and high toughness.

[0036] Regarding performance, as shown in Table 4, the room temperature microhardness of the embodiments of the present invention reaches 900-980 HV, an improvement of approximately 15-20% compared to the comparative example; compressive strength is increased by approximately 10-15%, and impact energy is increased by 20-40%; the hot hardness retention rate at 550℃ is ≥70%, an improvement of approximately 10-15 percentage points compared to traditional high-speed steel; specific wear rate is reduced by 60-80%, and the coefficient of friction is reduced by approximately 10-20%. Furthermore, the weight gain under high-temperature oxidation conditions at 700℃ is less than 4 mg / cm³. 2 It exhibits excellent antioxidant properties and tissue stability.

[0037] In summary, this invention achieves a comprehensive improvement in hardness, wear resistance, toughness, and high-temperature oxidation resistance through composition optimization and synergistic control of the spray forming-heat treatment process. Compared with existing technologies, the material of this invention maintains high hardness while also possessing high toughness and thermal stability, demonstrating significant comprehensive performance advantages. It can be widely used in high-temperature high-speed cutting tools, molds, and additive manufacturing powder materials. Solid carbide end mills manufactured using the high-performance superhard wear-resistant material powder of this invention via 3D printing can significantly improve cutting efficiency and tool life compared to traditional coated carbide tools. Especially when cutting materials with extremely high cutting resistance, such as nickel-based superalloys (e.g., Inconel 718), the tool maintains extremely high red hardness due to the dispersed hard phase within the material. Even when the tip area experiences temperatures exceeding 750°C due to intense frictional heating, it still maintains excellent resistance to plastic deformation and wear resistance, effectively preventing premature tool failure.

[0038] Through the design and implementation of this invention, CNC planer inserts manufactured using the high-performance, ultra-hard, wear-resistant material of this invention are used for rough machining of the outer shape of stainless steel turbine blades in large hydropower units. Compared with traditional high-speed steel tools, this significantly improves cutting efficiency and tool life. Especially in working conditions with high cutting resistance and prone to vibration, such as cutting weld bevels and deep grooves, the high toughness and compressive strength of this material ensure the reliability of the tool. Even under the instantaneous high temperature conditions caused by intermittent cutting, its performance far exceeds that of traditional tool steel, increasing machining efficiency by more than 40%.

[0039] Through the design and implementation of this invention, micro-diameter end mills (diameter ≤ 0.5 mm) manufactured using the high-performance superhard wear-resistant material powder of this invention via selective laser melting (SLM) technology are used for machining titanium alloy components of precision medical devices. Compared with traditional micro-tools, this invention can significantly improve cutting efficiency and tool life. Especially at ultra-high spindle speeds (>40,000 rpm), where the tool heats up significantly due to friction, the excellent high-temperature hardness and stability of the material of this invention ensure that the micro-diameter tool can maintain its morphological accuracy and sharpness at high temperatures. This completely solves the problem of breakage caused by softening of micro-tools during high-speed machining, increasing the service life by more than 3 times.

[0040] The above description is merely an embodiment of the present invention and is not intended to limit the present invention in any way. The present invention can also have other embodiments based on the above structure and function, which will not be listed hereafter. Therefore, any simple modifications, equivalent changes, and alterations made by those skilled in the art to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A high-performance, ultra-hard, wear-resistant material, characterized in that, High-performance superhard wear-resistant materials, by mass percentage, include the following chemical composition: C: 3.0%-4.0%; W: 4.3%-4.8%; Mn: 2.7%-3.1%; Cr: 6.0%-6.8%; Mo: 4.2%-5.2%; V: 5.7%-6.9%; Nb: 0.1%-0.2%; Co: 0.3%-0.4%, balance being Fe and unavoidable impurities, with a V / C ratio of 1.5-1.8; The microstructure of the material consists of diffusely distributed MC-type and M7C3-type carbides with an average size of 0.5-2 μm and a distribution uniformity of >95%. The matrix is ​​fine acicular martensite without coarse segregation.

2. The high-performance superhard wear-resistant material according to claim 1, characterized in that, In the MC-type carbide, M is selected from at least one of V, Nb, and Mo, and the volume fraction of the carbide is 25-30%.

3. The high-performance superhard wear-resistant material according to claim 1, characterized in that, The material has a room temperature microhardness of 900-980 HV, a compressive strength of 3000-3400 MPa, and an impact energy ≥18 J / cm². 2 .

4. The high-performance superhard wear-resistant material according to claim 1, characterized in that, The material exhibits a heat hardness retention rate of ≥70% at 550℃ and an oxidation weight gain rate of <4 mg / cm³ at 700℃. 2 .

5. A method for preparing the high-performance superhard wear-resistant material according to any one of claims 1-4, characterized in that, Includes the following steps: Step 1, Weighing raw materials: Weigh high-purity raw materials according to the specified ratio, wherein the purity of the raw materials is ≥99.9%; Step 2, Vacuum melting: Vacuum melting at 1600-1700℃ and vacuum degree <10 Pa for 30-60 min; Step 3, spray deposition: use 2-4 MPa high-pressure nitrogen atomization spray to form the shape, and deposit at 800-1000℃ for 60-90 min; Step 4, oil extraction: After austenitizing the obtained spray-deposited billet at 1200-1250℃ for 30-45 min, immediately oil quench it to 200-250℃; Step 5, tempering treatment: Perform tempering treatment three times in sequence, each time at a tempering temperature of 570℃ and a time of 2 hours. After each tempering, air cool the device at a rate of 15-25℃ / min.

6. The preparation method according to claim 5, characterized in that, The cooling rate of the spray forming in step 3 is 10. 3 -10 4 K / s, to suppress carbide coarsening and improve tissue uniformity.

7. The preparation method according to claim 5, characterized in that, In step 4, medium-speed quenching oil is used for oil quenching. The oil temperature of the medium-speed quenching oil is 45~55℃, and it is cooled under stirring to ensure a uniform cooling rate of 50~100℃ / min.

8. An application of the high-performance superhard wear-resistant material according to any one of claims 1-4, characterized in that, This material is used to manufacture high-speed cutting tools, molds, or additive manufacturing powders for cutting and forming processes under high temperature (>700℃) and high load conditions.

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