High-strength wear-resistant alloy steel for track shoe and preparation method of high-strength wear-resistant alloy steel

Abstract

The invention relates to high-strength wear-resistant alloy steel for a track shoe and a preparation method of the high-strength wear-resistant alloy steel, and belongs to the technical field of alloy steel preparation, and the preparation method comprises the following steps: smelting raw materials, performing homogenization treatment, forging treatment and heat treatment to obtain an alloy steel matrix, and performing ultrasonic shot peening strengthening treatment on the alloy steel matrix to obtain a pretreated alloy steel matrix; and after the pretreated alloy steel matrix is subjected to sand blasting treatment, an epoxy resin composite material is sprayed, curing is conducted, and finally the high-strength wear-resistant alloy steel for the track shoe is obtained. According to the technical scheme, the surface of the alloy steel matrix is subjected to ultrasonic shot peening strengthening treatment, so that the adhesive force between the epoxy resin composite material and the alloy steel matrix is enhanced, and the mechanical property and wear resistance of the alloy steel are improved; the epoxy resin composite material well improves the mechanical strength, toughness, wear resistance, corrosion resistance and thermal stability of the alloy steel, prolongs the service life of the alloy steel, and overall improves the comprehensive performance of the alloy steel.

Description

Technical Field

[0001] This invention belongs to the field of alloy steel preparation technology, specifically, it relates to a high-strength wear-resistant alloy steel for track plates and its preparation method. Background Technology

[0002] Tracked cranes are widely used in heavy lifting operations in infrastructure, wind power, petroleum, and chemical industries, and are key equipment in engineering construction. The track plates in their traveling mechanism, as the main load-bearing components, not only need to bear the weight of the entire machine but also the load of the lifted objects. Furthermore, the track plates operate in harsh environments, enduring various stresses such as impact, compression, bending, and tension over long periods, and are in direct contact with sand, soil, support rollers, and drive wheels, leading to severe wear problems. With the significant increase in demand for lifting operations in complex terrain and extreme conditions, higher requirements are being placed on the performance of the track plates. While the martensitic wear-resistant steel widely used in the market has high strength and hardness, its low toughness makes it prone to fracture under complex stress, especially under high impact loads or low-temperature environments. In addition, traditional wear-resistant steel is prone to oxidation and corrosion in humid or corrosive environments, limiting its widespread application. Therefore, there is an urgent need to develop an alloy steel that combines high strength, high toughness, excellent wear resistance, and corrosion resistance to significantly extend the service life of the track plates, reduce maintenance costs, and improve equipment operating efficiency.

[0003] In existing technologies, the corrosion resistance of alloy steel is usually improved by coating the surface with corrosion-resistant coatings. However, due to the weak interfacial bonding between the coating and the metal substrate, the coating is prone to peeling or damage, thus exposing the steel to a corrosive environment and causing accelerated corrosion. In addition, increasing the carbon content or using complex heat treatment processes to improve the hardness and strength of steel often leads to a decrease in the toughness of the material, making it more prone to fracture under impact, which in turn aggravates the wear of the track plates and further affects the final quality of the product. Summary of the Invention

[0004] The purpose of this invention is to provide a high-strength wear-resistant alloy steel for track plates and its preparation method. The method involves smelting the raw materials in step S1, followed by homogenization, forging, and heat treatment to obtain an alloy steel matrix. This matrix is ​​then subjected to ultrasonic shot peening to obtain a pretreated alloy steel matrix. After sandblasting, an epoxy resin composite material is sprayed onto the pretreated alloy steel matrix, followed by curing to obtain the high-strength wear-resistant alloy steel for track plates. Ultrasonic shot peening not only enhances the adhesion between the epoxy resin composite material and the alloy steel matrix but also improves the mechanical properties and wear resistance of the alloy steel. The epoxy resin composite material significantly improves the mechanical strength, toughness, wear resistance, corrosion resistance, and thermal stability of the alloy steel, and extends its service life, thus enhancing the overall performance of the alloy steel.

[0005] The technical problem this invention aims to solve is as follows: In the prior art, the corrosion resistance of alloy steel is usually improved by coating the surface with corrosion-resistant coatings. However, due to the weak interfacial bonding between the coating and the metal substrate, the coating is prone to peeling or damage, thus exposing the steel to a corrosive environment and causing accelerated corrosion. In addition, increasing the carbon content or using complex heat treatment processes to improve the hardness and strength of steel often leads to a decrease in the toughness of the material, making it prone to fracture when subjected to impact, which in turn aggravates the wear of the track plates and further affects the final quality of the product.

[0006] The objective of this invention can be achieved through the following technical solutions: A method for preparing high-strength wear-resistant alloy steel for track plates includes the following steps: S1: Raw materials: By weight percentage, it includes the following components: carbon 0.2-0.24%, aluminum 0.03-0.05%, manganese 1.2-1.4%, chromium 0.7-0.9%, molybdenum 0.2-0.3%, phosphorus 0.01-0.012%, sulfur 0.001-0.003%, niobium 0.05-0.15%, titanium 0.01-0.02%, with the balance being iron and other unavoidable impurities; S2: Preparation of pretreated alloy steel matrix: The raw materials in step S1 are smelted to obtain steel ingots. The steel ingots are homogenized, forged and heat-treated to obtain alloy steel matrix. The alloy steel matrix is ​​subjected to ultrasonic shot peening to obtain pretreated alloy steel matrix. S3: Preparation of high-strength wear-resistant alloy steel for track plates: After sandblasting the pretreated alloy steel substrate in step S2, epoxy resin composite material is sprayed on it and cured to obtain high-strength wear-resistant alloy steel for track plates. The epoxy resin composite material is prepared by uniformly mixing epoxy resin, functional reinforcing materials and curing agent.

[0007] Furthermore, in step S2, the smelting process specifically includes: The raw materials from step S1 are loaded into a melting furnace, and the furnace is evacuated to a vacuum degree of <40Pa. The raw materials are heated until they are completely melted and no bubbles overflow from the surface of the molten pool. The furnace is then held at a vacuum degree of <0.1Pa and a temperature of 1580-1620℃ for 1.5-2.5 hours. The furnace is then cast and cooled to obtain a steel ingot.

[0008] Further, in step S2, the homogenization process specifically includes: The steel ingot is placed in a heating furnace and preheated at 500-600℃ for 1-1.5 hours. Then the temperature is raised to 1100-1150℃ and held for 3.5-4.5 hours to complete the homogenization process.

[0009] Furthermore, in step S2, the forging process specifically includes: The homogenized steel ingots are forged in open forging at an initial forging temperature of 1150-1200℃ and a final forging temperature of 950-1000℃. The deformation amount of each forging pass is 12-15%. After each forging pass is completed, the ingots are reheated in the furnace to 1150-1200℃. After forging, the ingots are placed in sand for slow cooling.

[0010] Further, in step S2, the heat treatment process specifically includes: The forged steel ingot is held at 880-920℃ for 1-2 hours, then oil-cooled, and then held at 400-450℃ for 2-4 hours, followed by air cooling to obtain the alloy steel matrix.

[0011] Further, in step S2, the conditions for ultrasonic shot peening are as follows: the shot used in ultrasonic shot peening is a mixed grinding medium, the shot diameter is 3-4 mm, the ultrasonic frequency is 20 kHz, the ultrasonic amplitude is 20-40 μm, and the shot peening time is 3-5 min.

[0012] Furthermore, the mixed grinding media is prepared by grinding titanium nitride powder, boron carbide powder and zirconium oxide balls mixed in a mass ratio of 3-4:2:1.

[0013] Further, in step S3, the conditions for sandblasting are as follows: aluminum oxide particles with a particle size of 0.3 mm are selected for sandblasting, the compressed air pressure is 0.6-0.8 MPa, the sandblasting distance is 120-160 mm, the sandblasting angle is 90°, and the surface roughness is controlled to be 60-80 μm.

[0014] Furthermore, in step S3, the spraying thickness of the epoxy resin composite material is 140-200 μm.

[0015] Further, in step S3, the curing conditions are as follows: first, cure at 75-85℃ for 1.5-2.5h, then cure at 115-125℃ for 1.5-2.5h, and finally cure at 155-165℃ for 3.5-4.5h to complete the curing.

[0016] Further, in step S3, the preparation method of the epoxy resin composite material includes the following steps: The epoxy resin and functional reinforcing material are mixed and stirred for 0.5-1 hour. Then, the curing agent is added and stirred evenly. Finally, vacuum degassing is performed to obtain the epoxy resin composite material.

[0017] Furthermore, the mass ratio of the epoxy resin, functional reinforcing material, and curing agent is 0.9-1.1:0.1-0.2:0.15-0.25.

[0018] Furthermore, the curing agent is 4,4'-diaminodiphenyl sulfone.

[0019] Furthermore, the vacuum degassing temperature is 45-55℃, and the time is 15-25 minutes.

[0020] Furthermore, the preparation method of the functional reinforcing material includes the following steps: Carboxyl-terminated hyperbranched polyester was added to a mixed solvent of N,N-dimethylformamide and isobutanol and ultrasonically dispersed. Then, reinforcing material and p-toluenesulfonic acid were added, and the mixture was stirred under nitrogen protection. After the reaction was completed, the mixture was cooled to room temperature, filtered through a filter membrane, washed with acetone, and finally vacuum dried to obtain the functional reinforcing material.

[0021] In the above reaction process, the carboxyl-terminated hyperbranched polyester has carboxyl groups, and the reinforcing material has hydroxyl groups. The carboxyl groups in the carboxyl-terminated hyperbranched polyester can react and combine with the hydroxyl groups in the reinforcing material, thus combining the carboxyl-terminated hyperbranched polyester with the reinforcing material to finally obtain a functional reinforcing material.

[0022] Furthermore, the mass ratio of the carboxyl-terminated hyperbranched polyester, N,N-dimethylformamide and isobutanol mixed solvent, reinforcing material and p-toluenesulfonic acid is 0.9-1.1:45-55:0.2-0.3:0.01-0.03.

[0023] Furthermore, the ultrasonic dispersion time is 25-35 minutes.

[0024] Furthermore, the temperature of the stirring reaction is 120-130℃, and the time is 46-50h.

[0025] Furthermore, the filter membrane is a PVDF filter membrane with an average pore size of 0.22 μm.

[0026] Furthermore, the vacuum drying temperature is 75-85℃, and the time is 24 hours.

[0027] Furthermore, the preparation method of the carboxyl-terminated hyperbranched polyester includes the following steps: A fluorinated compound was added to a mixed solvent of N,N-dimethylformamide and isobutanol and stirred. Then, bisphenol A diglycidyl ether and a catalyst were added, and the reaction was stirred under nitrogen protection. After the reaction was completed, the mixture was cooled to room temperature and then added to deionized water to precipitate the product. After filtration, the product was washed with a mixed solution of tetrahydrofuran and ethanol and finally dried under vacuum to obtain a carboxyl-terminated hyperbranched polyester.

[0028] In the above reaction process, the fluorinated compound has a carboxyl group, and the bisphenol A diglycidyl ether has an epoxy group. The carboxyl group in the fluorinated compound can combine with the epoxy group in the bisphenol A diglycidyl ether through a ring-opening reaction, thus combining the fluorinated compound with the bisphenol A diglycidyl ether, and finally obtaining a carboxyl-terminated hyperbranched polyester.

[0029] Furthermore, the mass ratio of the fluorinated compound, N,N-dimethylformamide and isobutanol mixed solvent, bisphenol A diglycidyl ether, and catalyst is 14-15:90-110:18.5-19.5:0.35-0.45.

[0030] Furthermore, the fluorinated compound is composed of 4-trifluoromethylbenzoic acid and perfluoroadipic acid in a mass ratio of 0.9-1.1:0.4-0.6.

[0031] Furthermore, the catalyst is triphenylphosphine.

[0032] Furthermore, the stirring temperature is 110-120℃, and the stirring time is 1-1.5h.

[0033] Furthermore, the temperature of the stirring reaction is 110-120℃, and the time is 22-24h.

[0034] Furthermore, the method for preparing the reinforcing material includes the following steps: A1: The nanofiller was added to Tris buffer solution and sonicated. Dopamine was then added and the mixture was stirred. After the reaction was completed, the nanofiller was centrifuged, washed with anhydrous ethanol, and finally vacuum dried to obtain the modified nanofiller. A2: The modified nanofiller was added to Tris buffer solution and sonicated. Then graphene oxide was added and stirred. After the reaction was completed, the mixture was centrifuged, washed with anhydrous ethanol, and finally vacuum dried to obtain the reinforced material.

[0035] In the above reaction process, in step A1, dopamine undergoes an oxidative self-polymerization reaction to generate polydopamine, which can coat the surface of the nanofiller to obtain a modified nanofiller; in step A2, the modified nanofiller contains amino and hydroxyl groups, and graphene oxide contains hydroxyl, carboxyl, and epoxy groups, which can be combined together by hydrogen bonding to finally obtain a reinforced material.

[0036] Further, in step A1, the mass ratio of the nanofiller, Tris buffer solution, and dopamine is 0.9-1.1:190-210:0.15-0.25.

[0037] Furthermore, the nanofiller is composed of nano-zirconia and nano-alumina mixed in a mass ratio of 0.7-0.8:0.5-0.6.

[0038] Furthermore, the preparation of the Tris buffer solution is as follows: according to the mass ratio of Tris-HCl solution to deionized water of 1.2:1000, Tris-HCl solution is added to deionized water and stirred evenly. Then, 1 mol / L sodium hydroxide solution is added to adjust the pH value of the solution to 8.5 to obtain the Tris buffer solution.

[0039] Furthermore, in step A1, the ultrasonic treatment time is 25-35 minutes.

[0040] Furthermore, in step A1, the temperature of the stirring reaction is 45-55℃, and the time is 5.5-6.5h.

[0041] Furthermore, in step A1, the centrifugation speed is 8000-9000 rpm and the time is 5-10 min.

[0042] Further, in step A2, the mass ratio of the modified nanofiller, Tris buffer solution, and graphene oxide is 0.9-1.1:190-210:0.01-0.03.

[0043] Furthermore, in step A2, the temperature of the stirring reaction is 55-65℃, and the time is 5-6h.

[0044] A high-strength wear-resistant alloy steel for track plates prepared by the above method.

[0045] The beneficial effects of this invention are: (1) In the technical solution of this invention, the raw materials are smelted, then homogenized, forged and heat-treated to obtain an alloy steel matrix. The alloy steel matrix is ​​then subjected to ultrasonic shot peening to obtain a pretreated alloy steel matrix. The interaction between the raw materials can effectively improve the wear resistance, corrosion resistance and mechanical properties of the alloy steel. The surface of the alloy steel matrix is ​​strengthened by ultrasonic shot peening, wherein the shot is a mixed grinding medium. The mixed grinding medium is prepared by grinding a mixture of titanium nitride powder, boron carbide powder and zirconium oxide balls. The titanium nitride powder and boron carbide powder play a synergistic role in wear resistance, which can not only effectively improve the wear resistance of the alloy steel but also improve the wear resistance of the alloy steel matrix. This process significantly improves the wear resistance, hardness, strength, and toughness of alloy steel, and also enhances the bonding force between epoxy resin composites and the alloy steel matrix. By pre-treating the alloy steel matrix with sandblasting, followed by spraying epoxy resin composites and curing, high-strength wear-resistant alloy steel for track plates is obtained. Sandblasting further increases the surface roughness of the alloy steel, improving the adhesion between the epoxy resin composites and the alloy steel matrix. Furthermore, spraying epoxy resin composites onto the surface of the alloy steel matrix effectively improves the wear resistance, corrosion resistance, mechanical properties, and thermal stability of the alloy steel, thus enhancing its overall performance.

[0046] (2) In the technical solution of the present invention, the epoxy resin composite material is prepared by uniformly mixing epoxy resin, functional reinforcing material and curing agent; wherein, the functional reinforcing material is prepared by combining carboxyl-terminated hyperbranched polyester and reinforcing material; the fluorinated compound in the carboxyl-terminated hyperbranched polyester is composed of 4-trifluoromethylbenzoic acid and perfluoroadipic acid, which play a synergistic role, and contains fluorine element, which can not only improve the hydrophobicity and corrosion resistance of epoxy resin, but also the carboxyl-terminated hyperbranched polyester prepared by combining fluorinated compound and bisphenol A diglycidyl ether can effectively improve the corrosion resistance, mechanical properties and toughness of epoxy resin, and the carboxyl-terminated hyperbranched polyester can improve the bonding force between reinforcing material and epoxy resin, thereby further improving the mechanical properties, wear resistance, corrosion resistance and thermal properties of epoxy resin. Stability; the reinforcing material is prepared by coating nanofillers with polydopamine and then combining them with graphene oxide; the nanofillers are composed of a mixture of nano-zirconia and nano-alumina; the two have a synergistic effect, which can effectively improve the wear resistance and mechanical properties of epoxy resin; by coating the surface of the nanofillers with polydopamine and then combining them with graphene oxide, the dispersibility of the nanofillers and graphene oxide can be improved, preventing their agglomeration, and the interfacial bonding force between the nanofillers and epoxy resin can be enhanced, effectively improving the wear resistance, corrosion resistance, mechanical properties and thermal stability of epoxy resin; by spraying the epoxy resin composite material onto the surface of the pretreated alloy steel substrate, the corrosion resistance, wear resistance, mechanical strength and toughness of the alloy steel can be further improved, and the interfacial adhesion between the coating and the alloy steel substrate can be enhanced.

[0047] (3) In the technical solution of the present invention, the alloy steel substrate is strengthened by ultrasonic shot peening, then sandblasted, and then coated with epoxy resin composite material. After curing, high-strength wear-resistant alloy steel for track plates is finally obtained. The high-strength wear-resistant alloy steel for track plates not only has good mechanical properties, corrosion resistance, wear resistance and thermal stability, but also improves the interfacial adhesion between the coating and the alloy steel substrate, enhances the protective effect of the coating, and extends the service life of the high-strength wear-resistant alloy steel. The overall comprehensive performance is good. Detailed Implementation

[0048] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0049] The specific parameters of the raw materials used in this invention are as follows: Titanium nitride powder, particle size: 200 mesh, provided by Beijing Xingrongyuan Technology Co., Ltd.; Boron carbide powder, particle size / mesh: 300 mesh, provided by Nangong Naiyat Alloy Welding Materials Co., Ltd.; Zirconia balls, particle size: 0.1-50mm, preferably 3mm, provided by Jiangxi Kailai Chemical Packing Co., Ltd.; Epoxy resin (bisphenol A type epoxy resin), CAS No.: 25085-99-8, provided by Shanghai Yi'en Chemical Technology Co., Ltd.; 4-trifluoromethylbenzoic acid, CAS No.: 455-24-3, trade number: T819415, provided by [unclear - likely a company name]. The following are provided by Shanghai Aladdin Biochemical Technology Co., Ltd.: Perfluoroadipic acid (octafluoroadipic acid), CAS No.: 336-08-3, Product No.: O159889; Nano zirconium dioxide, particle size: 10-100nm, preferably 50nm, CAS No.: 1314-23-4; Nano alumina, particle size: 30-500nm, preferably 50nm, CAS No.: 1344-28-1.

[0050] Example 1 The specific steps for preparing epoxy resin composite materials are as follows: The epoxy resin, functional reinforcing material, and 4,4'-diaminodiphenyl sulfone were mixed in a mass ratio of 0.9:0.1:0.15. The mixture was stirred at room temperature for 0.5 h, then 4,4'-diaminodiphenyl sulfone was added and stirred until homogeneous. Finally, the mixture was degassed under vacuum at 45 °C for 25 min to obtain the epoxy resin composite material. The preparation method of functional reinforced materials includes the following steps: The carboxyl-terminated hyperbranched polyester, N,N-dimethylformamide and isobutanol mixed solvent, reinforcing material, and p-toluenesulfonic acid were mixed in a mass ratio of 0.9:45:0.2:0.01. The carboxyl-terminated hyperbranched polyester was added to the N,N-dimethylformamide and isobutanol mixed solvent (N,N-dimethylformamide and isobutanol volume ratio 7:3) and ultrasonically dispersed for 25 min (ultrasonic power 100 W, ultrasonic frequency 40 kHz). Then, the reinforcing material and p-toluenesulfonic acid were added, and the mixture was stirred and reacted at 120 °C under nitrogen protection for 50 h. After the reaction was completed, the mixture was cooled to room temperature, filtered through a PVDF filter membrane with an average pore size of 0.22 μm, washed three times with acetone (each time the mass of acetone was 30% of the mass of the N,N-dimethylformamide and isobutanol mixed solvent), and finally vacuum dried at 75 °C for 24 h to obtain the functional reinforcing material. The preparation method of carboxyl-terminated hyperbranched polyester includes the following steps: The fluorinated compound, a mixed solvent of N,N-dimethylformamide and isobutanol, bisphenol A diglycidyl ether, and triphenylphosphine were added in a mass ratio of 14:90:18.5:0.35 to the mixed solvent of N,N-dimethylformamide and isobutanol (volume ratio of N,N-dimethylformamide and isobutanol was 7:3). The mixture was stirred at 110°C for 1.5 h, then bisphenol A diglycidyl ether and triphenylphosphine were added. The reaction was carried out under nitrogen protection and stirred at 110°C for 24 h. After the reaction was completed, the mixture was cooled to room temperature and then added to deionized water. Precipitation was carried out in a mixture of deionized water (50% by mass of N,N-dimethylformamide and isobutanol), filtered, and washed three times with a mixture of tetrahydrofuran and ethanol (volume ratio of tetrahydrofuran to ethanol 1:1) (each time the mixture of tetrahydrofuran and ethanol was 20% by mass of N,N-dimethylformamide and isobutanol). Finally, it was vacuum dried at 75°C for 24 h to obtain a carboxyl-terminated hyperbranched polyester, wherein the fluorinated compound was composed of a mixture of 4-trifluoromethylbenzoic acid and perfluoroadipic acid in a mass ratio of 0.9:0.4. The preparation method of the reinforcing material includes the following steps: A1: The nanofiller, Tris buffer solution, and dopamine were mixed in a mass ratio of 0.9:190:0.15. The nanofiller was added to the Tris buffer solution and sonicated for 25 min (ultrasonic power 100 W, ultrasonic frequency 40 kHz). Dopamine was then added, and the mixture was stirred at 45 °C for 6.5 h. After the reaction, the mixture was centrifuged at 8000 rpm for 10 min, washed three times with anhydrous ethanol (each time the mass of anhydrous ethanol was 10% of the mass of the Tris buffer solution), and finally vacuum dried at 75 °C for 24 h to obtain the modified nanofiller. The nanofiller was composed of nano-zirconia and nano-alumina mixed in a mass ratio of 0.7:0.5. The Tris buffer solution was prepared as follows: the Tris-HCl solution was added to deionized water in a mass ratio of 1.2:1000 and stirred evenly. Then, 1 mol / L sodium hydroxide solution was added to adjust the pH of the solution to 8.5 to obtain the Tris buffer solution. A2: The modified nanofiller, Tris buffer solution, and graphene oxide were added to the Tris buffer solution in a mass ratio of 0.9:190:0.01 and ultrasonically treated for 25 min (ultrasonic power 100 W, ultrasonic frequency 40 kHz). Then, graphene oxide was added and the mixture was stirred at 55 °C for 6 h. After the reaction was completed, the mixture was centrifuged at 8000 rpm for 10 min and washed three times with anhydrous ethanol (each time the mass of anhydrous ethanol was 10% of the mass of the Tris buffer solution). Finally, the mixture was vacuum dried at 75 °C for 24 h to obtain the reinforced material. The specific steps for preparing high-strength wear-resistant alloy steel for track plates are as follows: S1: Raw materials: By weight percentage, it includes the following components: carbon 0.2%, aluminum 0.03%, manganese 1.2%, chromium 0.7%, molybdenum 0.2%, phosphorus 0.01%, sulfur 0.001%, niobium 0.05%, titanium 0.01%, with the balance being iron and other unavoidable impurities; S2: Preparation of pretreated alloy steel matrix: The raw materials from step S1 are loaded into a melting furnace, and a vacuum is drawn until the vacuum degree inside the furnace is <40Pa. The raw materials are heated until they are completely melted and no bubbles overflow from the surface of the molten pool. Then, the furnace is held at a vacuum degree <0.1Pa and 1580℃ for 2.5 hours. After casting and cooling, steel ingots are obtained. The steel ingots are placed in a heating furnace and preheated at 500℃ for 1.5 hours. The temperature is then raised to 1100℃ and held for 4.5 hours to complete the homogenization treatment. The homogenized steel ingots are then subjected to forging. The initial forging temperature is 1150℃, and the final forging temperature is 950℃. The deformation amount in each forging pass is 12%. After the first forging, the steel ingot is reheated to 1150℃ in the furnace. After forging, it is placed in sand for slow cooling. The forged steel ingot is then held at 880℃ for 2 hours, oil-cooled, and then held at 400℃ for 4 hours. After air cooling, an alloy steel matrix is ​​obtained. The alloy steel matrix is ​​then subjected to ultrasonic shot peening to obtain a pretreated alloy steel matrix. The shot used in the ultrasonic shot peening is a mixed grinding medium with a diameter of 3 mm, an ultrasonic frequency of 20 kHz, an ultrasonic amplitude of 20 μm, and a shot peening time of 3 minutes. The mixed grinding medium is prepared by grinding a mixture of titanium nitride powder, boron carbide powder, and zirconium oxide balls in a mass ratio of 3:2:1. S3: Preparation of high-strength wear-resistant alloy steel for track plates: The pretreated alloy steel substrate in step S2 is sandblasted (using 0.3mm alumina particles, compressed air pressure of 0.6MPa, sandblasting distance of 120mm, sandblasting angle of 90°, and surface roughness of 60μm). Then, epoxy resin composite material is sprayed on it. First, it is cured at 75℃ for 2.5h, then at 115℃ for 2.5h, and finally at 155℃ for 4.5h to complete the curing process, thus obtaining high-strength wear-resistant alloy steel for track plates. The coating thickness is 140μm.

[0051] Example 2 The specific steps for preparing epoxy resin composite materials are as follows: The epoxy resin, functional reinforcing material, and 4,4'-diaminodiphenyl sulfone were mixed in a mass ratio of 1:0.15:0.2 and stirred at room temperature for 0.7 h. Then, 4,4'-diaminodiphenyl sulfone was added and stirred evenly. Finally, the mixture was degassed under vacuum at 50 °C for 20 min to obtain the epoxy resin composite material. The preparation method of functional reinforced materials includes the following steps: The carboxyl-terminated hyperbranched polyester, N,N-dimethylformamide and isobutanol mixed solvent, reinforcing material, and p-toluenesulfonic acid were mixed in a mass ratio of 1:50:0.25:0.02. The carboxyl-terminated hyperbranched polyester was added to the N,N-dimethylformamide and isobutanol mixed solvent (N,N-dimethylformamide and isobutanol volume ratio of 7:3) and ultrasonically dispersed for 30 min (ultrasonic power of 100 W and ultrasonic frequency of 40 kHz). Then, the reinforcing material and p-toluenesulfonic acid were added, and the mixture was stirred and reacted at 125 °C under nitrogen protection for 48 h. After the reaction was completed, the mixture was cooled to room temperature, filtered through a PVDF filter membrane with an average pore size of 0.22 μm, washed three times with acetone (each time the mass of acetone was 30% of the mass of the N,N-dimethylformamide and isobutanol mixed solvent), and finally vacuum dried at 75 °C for 24 h to obtain the functional reinforcing material. The preparation method of carboxyl-terminated hyperbranched polyester includes the following steps: The fluorinated compound, a mixed solvent of N,N-dimethylformamide and isobutanol, bisphenol A diglycidyl ether, and triphenylphosphine were prepared in a mass ratio of 14.5:100:19:0.4. The fluorinated compound was added to the mixed solvent of N,N-dimethylformamide and isobutanol (volume ratio of N,N-dimethylformamide to isobutanol was 7:3), and the mixture was stirred at 115°C for 1.2 h. Then, bisphenol A diglycidyl ether and triphenylphosphine were added, and the reaction was carried out under nitrogen protection and stirred at 115°C for 23 h. After the reaction was completed, the mixture was cooled to room temperature and then added to deionized water. Precipitation was carried out in a mixture of deionized water (50% by mass of N,N-dimethylformamide and isobutanol), filtered, and washed four times with a mixture of tetrahydrofuran and ethanol (volume ratio of tetrahydrofuran to ethanol 1:1) (each time the mass of the tetrahydrofuran and ethanol mixture was 20% by mass of N,N-dimethylformamide and isobutanol), and finally vacuum dried at 80°C for 24 h to obtain a carboxyl-terminated hyperbranched polyester, wherein the fluorinated compound is composed of a mixture of 4-trifluoromethylbenzoic acid and perfluoroadipic acid in a mass ratio of 1:0.5; The preparation method of the reinforcing material includes the following steps: A1: The nanofiller, Tris buffer solution, and dopamine were mixed in a mass ratio of 1:200:0.2. The nanofiller was added to the Tris buffer solution and sonicated for 30 min (ultrasonic power 100 W, ultrasonic frequency 40 kHz). Dopamine was then added, and the mixture was stirred at 50 °C for 6 h. After the reaction, the mixture was centrifuged at 8500 rpm for 8 min, washed three times with anhydrous ethanol (each time the mass of anhydrous ethanol was 10% of the mass of the Tris buffer solution), and finally vacuum dried at 80 °C for 24 h to obtain the modified nanofiller. The nanofiller was composed of nano-zirconia and nano-alumina mixed in a mass ratio of 0.75:0.55. The Tris buffer solution was prepared as follows: the Tris-HCl solution was added to deionized water in a mass ratio of 1.2:1000 and stirred evenly. Then, 1 mol / L sodium hydroxide solution was added to adjust the pH of the solution to 8.5 to obtain the Tris buffer solution. A2: The modified nanofiller, Tris buffer solution, and graphene oxide were added to the Tris buffer solution at a mass ratio of 1:200:0.02, and ultrasonically treated for 30 min (ultrasonic power of 100 W, ultrasonic frequency of 40 kHz). Then, graphene oxide was added, and the mixture was stirred at 60 °C for 5.5 h. After the reaction was completed, the mixture was centrifuged at 8500 rpm for 8 min, washed three times with anhydrous ethanol (each time the mass of anhydrous ethanol was 10% of the mass of the Tris buffer solution), and finally vacuum dried at 80 °C for 24 h to obtain the reinforced material. The specific steps for preparing high-strength wear-resistant alloy steel for track plates are as follows: S1: Raw materials: By weight percentage, it includes the following components: carbon 0.22%, aluminum 0.04%, manganese 1.3%, chromium 0.8%, molybdenum 0.25%, phosphorus 0.011%, sulfur 0.002%, niobium 0.1%, titanium 0.015%, with the balance being iron and other unavoidable impurities; S2: Preparation of pretreated alloy steel matrix: The raw materials from step S1 are loaded into a melting furnace, and a vacuum is drawn until the vacuum degree inside the furnace is <40Pa. After heating until the raw materials are completely melted and no bubbles overflow from the surface of the molten pool, the furnace is held at a vacuum degree <0.1Pa and 1600℃ for 2 hours. Then, the furnace is cast and cooled to obtain a steel ingot. The steel ingot is placed in a heating furnace and preheated at 550℃ for 1.2 hours, then heated to 1130℃ and held for 4 hours to complete the homogenization treatment. The homogenized steel ingot is then forged. The initial forging temperature is 1180℃ and the final forging temperature is 980℃. The deformation amount of each forging pass is 13%. Each forging pass is completed... The steel ingot was then reheated to 1180℃ in a furnace. After forging, it was placed in sand for slow cooling. The forged steel ingot was then held at 900℃ for 1.5 hours, oil-cooled, and then held at 430℃ for 3 hours. After air cooling, an alloy steel matrix was obtained. The alloy steel matrix was then subjected to ultrasonic shot peening to obtain a pretreated alloy steel matrix. The shot used in the ultrasonic shot peening was a mixed grinding medium with a diameter of 3.5 mm, an ultrasonic frequency of 20 kHz, an ultrasonic amplitude of 30 μm, and a shot peening time of 4 minutes. The mixed grinding medium was prepared by grinding a mixture of titanium nitride powder, boron carbide powder, and zirconium oxide balls in a mass ratio of 3.5:2:1. S3: Preparation of high-strength wear-resistant alloy steel for track plates: The pretreated alloy steel substrate in step S2 is sandblasted (using 0.3mm alumina particles, compressed air pressure of 0.7MPa, sandblasting distance of 140mm, sandblasting angle of 90°, and surface roughness of 70μm). Then, epoxy resin composite material is sprayed on it. First, it is cured at 80℃ for 2h, then at 120℃ for 2h, and finally at 160℃ for 4h to complete the curing process, thus obtaining high-strength wear-resistant alloy steel for track plates. The coating thickness is 170μm.

[0052] Example 3 The specific steps for preparing epoxy resin composite materials are as follows: The epoxy resin, functional reinforcing material, and 4,4'-diaminodiphenyl sulfone were mixed in a mass ratio of 1.1:0.2:0.25 and stirred at room temperature for 1 hour. Then, 4,4'-diaminodiphenyl sulfone was added and stirred evenly. Finally, the mixture was degassed under vacuum at 55°C for 15 minutes to obtain the epoxy resin composite material. The preparation method of functional reinforced materials includes the following steps: The carboxyl-terminated hyperbranched polyester, N,N-dimethylformamide and isobutanol mixed solvent, reinforcing material, and p-toluenesulfonic acid were mixed in a mass ratio of 1.1:55:0.3:0.03. The carboxyl-terminated hyperbranched polyester was added to the N,N-dimethylformamide and isobutanol mixed solvent (N,N-dimethylformamide and isobutanol volume ratio of 7:3) and ultrasonically dispersed for 35 min (ultrasonic power of 100 W and ultrasonic frequency of 40 kHz). Then, the reinforcing material and p-toluenesulfonic acid were added, and the mixture was stirred and reacted at 130 °C under nitrogen protection for 46 h. After the reaction was completed, the mixture was cooled to room temperature, filtered through a PVDF filter membrane with an average pore size of 0.22 μm, washed three times with acetone (each time the mass of acetone was 30% of the mass of the N,N-dimethylformamide and isobutanol mixed solvent), and finally vacuum dried at 85 °C for 24 h to obtain the functional reinforcing material. The preparation method of carboxyl-terminated hyperbranched polyester includes the following steps: The fluorinated compound, a mixed solvent of N,N-dimethylformamide and isobutanol, bisphenol A diglycidyl ether, and triphenylphosphine were added in a mass ratio of 15:110:19.5:0.45 to the mixed solvent of N,N-dimethylformamide and isobutanol (volume ratio of N,N-dimethylformamide and isobutanol was 7:3). The mixture was stirred at 120°C for 1 hour, then bisphenol A diglycidyl ether and triphenylphosphine were added. The reaction was carried out under nitrogen protection and stirred at 120°C for 22 hours. After the reaction was completed, the mixture was cooled to room temperature and then added to deionized water. Precipitation was carried out in a mixture of deionized water (50% by mass of N,N-dimethylformamide and isobutanol), filtered, and washed five times with a mixture of tetrahydrofuran and ethanol (volume ratio of tetrahydrofuran to ethanol 1:1) (each time the mixture of tetrahydrofuran and ethanol was 20% by mass of N,N-dimethylformamide and isobutanol). Finally, it was vacuum dried at 85°C for 24 h to obtain a carboxyl-terminated hyperbranched polyester, wherein the fluorinated compound was composed of a mixture of 4-trifluoromethylbenzoic acid and perfluoroadipic acid in a mass ratio of 1.1:0.6. The preparation method of the reinforcing material includes the following steps: A1: The nanofiller, Tris buffer solution, and dopamine were mixed in a mass ratio of 1.1:210:0.25. The nanofiller was added to the Tris buffer solution and sonicated for 35 min (ultrasonic power 100 W, ultrasonic frequency 40 kHz). Dopamine was then added, and the mixture was stirred at 55 °C for 5.5 h. After the reaction, the mixture was centrifuged at 9000 rpm for 5 min, washed three times with anhydrous ethanol (each time the mass of anhydrous ethanol was 10% of the mass of the Tris buffer solution), and finally vacuum dried at 85 °C for 24 h to obtain the modified nanofiller. The nanofiller was composed of nano-zirconia and nano-alumina mixed in a mass ratio of 0.8:0.6. The Tris buffer solution was prepared as follows: the Tris-HCl solution was added to deionized water in a mass ratio of 1.2:1000 and stirred evenly. Then, 1 mol / L sodium hydroxide solution was added to adjust the pH of the solution to 8.5 to obtain the Tris buffer solution. A2: The modified nanofiller, Tris buffer solution, and graphene oxide were added to the Tris buffer solution in a mass ratio of 1.1:210:0.03, and ultrasonically treated for 35 min (ultrasonic power of 100 W, ultrasonic frequency of 40 kHz). Then, graphene oxide was added, and the mixture was stirred at 65 °C for 5 h. After the reaction was completed, the mixture was centrifuged at 9000 rpm for 5 min, washed three times with anhydrous ethanol (each time the mass of anhydrous ethanol was 10% of the mass of the Tris buffer solution), and finally vacuum dried at 85 °C for 24 h to obtain the reinforced material. The specific steps for preparing high-strength wear-resistant alloy steel for track plates are as follows: S1: Raw materials: By weight percentage, it includes the following components: carbon 0.24%, aluminum 0.05%, manganese 1.4%, chromium 0.9%, molybdenum 0.3%, phosphorus 0.012%, sulfur 0.003%, niobium 0.15%, titanium 0.02%, with the balance being iron and other unavoidable impurities; S2: Preparation of pretreated alloy steel matrix: The raw materials from step S1 are loaded into a melting furnace, and a vacuum is drawn until the vacuum degree inside the furnace is <40Pa. The raw materials are heated until they are completely melted and no bubbles overflow from the surface of the molten pool. Then, the furnace is held at a vacuum degree <0.1Pa and 1620℃ for 1.5 hours. After casting and cooling, a steel ingot is obtained. The steel ingot is placed in a heating furnace and preheated at 600℃ for 1 hour, then heated to 1150℃ and held for 3.5 hours to complete the homogenization treatment. The homogenized steel ingot is then subjected to forging. The initial forging temperature is 1200℃, and the final forging temperature is 1000℃. The deformation amount in each forging pass is 15%. After forging, the steel ingot is reheated to 1200℃ in a furnace. After forging, it is placed in sand for slow cooling. The forged steel ingot is held at 920℃ for 1 hour, then oil-cooled, and then held at 450℃ for 2 hours. After air cooling, an alloy steel matrix is ​​obtained. The alloy steel matrix is ​​then subjected to ultrasonic shot peening to obtain a pretreated alloy steel matrix. The shot used in the ultrasonic shot peening is a mixed grinding medium with a diameter of 4 mm, an ultrasonic frequency of 20 kHz, an ultrasonic amplitude of 40 μm, and a shot peening time of 5 min. The mixed grinding medium is prepared by grinding a mixture of titanium nitride powder, boron carbide powder, and zirconium oxide balls in a mass ratio of 4:2:1. S3: Preparation of high-strength wear-resistant alloy steel for track plates: The pretreated alloy steel substrate in step S2 is sandblasted (using 0.3mm alumina particles, compressed air pressure of 0.8MPa, sandblasting distance of 160mm, sandblasting angle of 90°, and surface roughness of 80μm). Then, epoxy resin composite material is sprayed on it. First, it is cured at 85℃ for 1.5h, then at 125℃ for 1.5h, and finally at 165℃ for 3.5h to complete the curing process, thus obtaining high-strength wear-resistant alloy steel for track plates. The coating thickness is 200μm.

[0053] Comparative Example 1 The difference between this comparative example and Example 3 is that, in the preparation of the epoxy resin composite material, the fluorine-containing compound is replaced by 4-trifluoromethylbenzoic acid in equal mass, while the remaining steps and raw materials are the same as in Example 3; The preparation method of carboxyl-terminated hyperbranched polyester includes the following steps: The mass ratio of 4-trifluoromethylbenzoic acid, N,N-dimethylformamide and isobutanol mixed solvent, bisphenol A diglycidyl ether and triphenylphosphine was 15:110:19.5:0.45. 4-trifluoromethylbenzoic acid was added to the mixed solvent of N,N-dimethylformamide and isobutanol (N,N-dimethylformamide and isobutanol volume ratio 7:3), and stirred at 120°C for 1 hour. Then, bisphenol A diglycidyl ether and triphenylphosphine were added, and the reaction was carried out under nitrogen protection and stirred at 120°C. After 22 hours of reaction, the mixture was cooled to room temperature and then added to deionized water (50% by mass of the mixed solvent of N,N-dimethylformamide and isobutanol) for precipitation. After filtration, the mixture was washed five times with a mixed solution of tetrahydrofuran and ethanol (volume ratio of tetrahydrofuran to ethanol 1:1) (each time the mixed solution of tetrahydrofuran and ethanol was 20% by mass of the mixed solvent of N,N-dimethylformamide and isobutanol). Finally, the mixture was vacuum dried at 85°C for 24 hours to obtain carboxyl-terminated hyperbranched polyester.

[0054] Comparative Example 2 The difference between this comparative example and Example 3 is that, in the preparation of the epoxy resin composite material, the fluorinated compound is replaced by perfluoroadipic acid in equal mass, while the remaining steps and raw materials are the same as in Example 3. The preparation method of carboxyl-terminated hyperbranched polyester includes the following steps: The perfluoroadipic acid, N,N-dimethylformamide and isobutanol mixed solvent, bisphenol A diglycidyl ether and triphenylphosphine were reacted in a mass ratio of 15:110:19.5:0.45. The perfluoroadipic acid was added to the N,N-dimethylformamide and isobutanol mixed solvent (N,N-dimethylformamide and isobutanol volume ratio 7:3), and stirred at 120°C for 1 h. Then, bisphenol A diglycidyl ether and triphenylphosphine were added, and the reaction was carried out under nitrogen protection and stirred at 120°C for 22 h. After the reaction was completed, the mixture was cooled to room temperature and then added to deionized water (50% by mass of the mixed solvent of N,N-dimethylformamide and isobutanol) for precipitation. After filtration, the mixture was washed five times with a mixed solution of tetrahydrofuran and ethanol (volume ratio of tetrahydrofuran and ethanol was 1:1) (each time the mixed solution of tetrahydrofuran and ethanol was 20% by mass of the mixed solvent of N,N-dimethylformamide and isobutanol). Finally, the mixture was vacuum dried at 85°C for 24 h to obtain carboxyl-terminated hyperbranched polyester.

[0055] Comparative Example 3 The difference between this comparative example and Example 3 is that, in the preparation of the epoxy resin composite material, the nanofiller is replaced with nano-zirconia of equal mass, while the remaining steps and raw materials are the same as in Example 3. A1: Following a mass ratio of nano-zirconia, Tris buffer solution, and dopamine of 1.1:210:0.25, nano-zirconia was added to the Tris buffer solution and sonicated for 35 min (ultrasonic power 100 W, ultrasonic frequency 40 kHz). Dopamine was then added, and the mixture was stirred at 55 °C for 5.5 h. After the reaction, the mixture was centrifuged at 9000 rpm for 5 min, washed three times with anhydrous ethanol (each time the mass of anhydrous ethanol was 10% of the mass of the Tris buffer solution), and finally vacuum dried at 85 °C for 24 h to obtain the modified nanofiller. The Tris buffer solution was prepared as follows: Tris-HCl solution was added to deionized water at a mass ratio of 1.2:1000, and stirred evenly. Then, 1 mol / L sodium hydroxide solution was added to adjust the pH of the solution to 8.5 to obtain the Tris buffer solution.

[0056] Comparative Example 4 The difference between this comparative example and Example 3 is that, in the preparation of the epoxy resin composite material, the nanofiller is replaced with nano alumina by the same mass, while the remaining steps and raw materials are the same as in Example 3. A1: The nano-alumina, Tris buffer solution, and dopamine were mixed in a mass ratio of 1.1:210:0.25. The nano-alumina was added to the Tris buffer solution and sonicated for 35 min (ultrasonic power 100 W, ultrasonic frequency 40 kHz). Dopamine was then added, and the mixture was stirred at 55 °C for 5.5 h. After the reaction, the mixture was centrifuged at 9000 rpm for 5 min and washed three times with anhydrous ethanol (each time the mass of anhydrous ethanol was 10% of the mass of the Tris buffer solution). Finally, the mixture was vacuum dried at 85 °C for 24 h to obtain the modified nanofiller. The Tris buffer solution was prepared as follows: the Tris-HCl solution was added to deionized water in a mass ratio of 1.2:1000 and stirred evenly. Then, 1 mol / L sodium hydroxide solution was added to adjust the pH of the solution to 8.5 to obtain the Tris buffer solution.

[0057] Comparative Example 5 The difference between this comparative example and Example 3 is that, in the preparation of the epoxy resin composite material, the reinforcing material is composed of nanofillers and graphene oxide mixed in a mass ratio of 1:1, while the remaining steps and raw materials are the same as in Example 3. The preparation method of functional reinforced materials includes the following steps: The carboxyl-terminated hyperbranched polyester, N,N-dimethylformamide and isobutanol mixed solvent, reinforcing material, and p-toluenesulfonic acid were mixed in a mass ratio of 1.1:55:0.3:0.03. The carboxyl-terminated hyperbranched polyester was added to the N,N-dimethylformamide and isobutanol mixed solvent (N,N-dimethylformamide and isobutanol volume ratio 7:3) and ultrasonically dispersed for 35 min (ultrasonic power 100 W, ultrasonic frequency 40 kHz). Then, the reinforcing material and p-toluenesulfonic acid were added, and the mixture was stirred at 130℃ under nitrogen protection. The reaction was stirred for 46 hours. After the reaction was completed, it was cooled to room temperature and filtered through a PVDF filter membrane with an average pore size of 0.22 μm. The mixture was washed three times with acetone (each time the mass of acetone was 30% of the mass of the mixed solvent of N,N-dimethylformamide and isobutanol). Finally, it was vacuum dried at 85 °C for 24 hours to obtain the functional reinforcing material. The reinforcing material was composed of a mixture of nanofillers and graphene oxide in a mass ratio of 1:1. The nanofillers were composed of a mixture of nano-zirconium dioxide and nano-alumina in a mass ratio of 0.8:0.6.

[0058] Comparative Example 6 The difference between this comparative example and Example 3 is that, in the preparation of the epoxy resin composite material, the functional reinforcing material is composed of a mixture of carboxyl-terminated hyperbranched polyester and the reinforcing material in a mass ratio of 1:1, while the remaining steps and raw materials are the same as in Example 3. The specific steps for preparing epoxy resin composite materials are as follows: The epoxy resin, functional reinforcing material, and 4,4'-diaminodiphenyl sulfone were mixed in a mass ratio of 1.1:0.2:0.25 and stirred at room temperature for 1 hour. Then, 4,4'-diaminodiphenyl sulfone was added and stirred until homogeneous. Finally, the mixture was degassed under vacuum at 55°C for 15 minutes to obtain an epoxy resin composite material. The functional reinforcing material was composed of a carboxyl-terminated hyperbranched polyester and the reinforcing material mixed in a mass ratio of 1:1.

[0059] Comparative Example 7 The difference between this comparative example and Example 3 is that, in the preparation of the epoxy resin composite material, the functional reinforcing material is replaced by an equal mass of carboxyl-terminated hyperbranched polyester, while the remaining steps and raw materials are the same as in Example 3. The specific steps for preparing epoxy resin composite materials are as follows: The epoxy resin, carboxyl-terminated hyperbranched polyester, and 4,4'-diaminodiphenyl sulfone were mixed in a mass ratio of 1.1:0.2:0.25 and stirred at room temperature for 1 hour. Then, 4,4'-diaminodiphenyl sulfone was added and stirred until homogeneous. Finally, the mixture was degassed under vacuum at 55°C for 15 minutes to obtain the epoxy resin composite material.

[0060] Comparative Example 8 The difference between this comparative example and Example 3 is that, in the preparation of epoxy resin composite material, the functional reinforcing material is replaced by the same mass as the reinforcing material, while the remaining steps and raw materials are the same as in Example 3. The specific steps for preparing epoxy resin composite materials are as follows: The epoxy resin, reinforcing material, and 4,4'-diaminodiphenyl sulfone were mixed in a mass ratio of 1.1:0.2:0.25 and stirred at room temperature for 1 hour. Then, 4,4'-diaminodiphenyl sulfone was added and stirred until homogeneous. Finally, the mixture was degassed under vacuum at 55°C for 15 minutes to obtain the epoxy resin composite material.

[0061] Comparative Example 9 The difference between this comparative example and Example 3 is that, in the preparation of high-strength wear-resistant alloy steel for track plates, in step S2, the mixed grinding media in the ultrasonic shot peening treatment is prepared by grinding titanium nitride powder and zirconium oxide balls mixed in a mass ratio of 6:1. The remaining steps and raw materials are the same as in Example 3. S2: Preparation of Pretreated Alloy Steel Matrix: The raw materials from step S1 are loaded into a melting furnace, and a vacuum is drawn until the vacuum degree inside the furnace is <40Pa. The raw materials are heated until they are completely melted and no bubbles overflow from the surface of the molten pool. Then, the furnace is held at a vacuum degree <0.1Pa and 1620℃ for 1.5 hours. After casting and cooling, a steel ingot is obtained. The ingot is placed in a heating furnace and preheated at 600℃ for 1 hour, then heated to 1150℃ and held for 3.5 hours to complete the homogenization treatment. The homogenized steel ingot is then forged. The initial forging temperature is 1200℃, and the final forging temperature is 1000℃. The deformation amount in each forging pass is 15%. After each forging pass, the steel ingot is reheated to 1200℃ in the furnace. After forging, it is placed in sand for slow cooling. The forged steel ingot is held at 920℃ for 1 hour, then oil-cooled, and then held at 450℃ for 2 hours. After air cooling, an alloy steel matrix is ​​obtained. The alloy steel matrix is ​​then subjected to ultrasonic shot peening to obtain a pretreated alloy steel matrix. The shot used in the ultrasonic shot peening is a mixed grinding medium with a diameter of 4 mm, an ultrasonic frequency of 20 kHz, an ultrasonic amplitude of 40 μm, and a shot peening time of 5 min. The mixed grinding medium is prepared by grinding a mixture of titanium nitride powder and zirconium oxide balls at a mass ratio of 6:1.

[0062] Comparative Example 10 The difference between this comparative example and Example 3 is that, in the preparation of high-strength wear-resistant alloy steel for track plates, in step S2, the mixed grinding media in the ultrasonic shot peening treatment is prepared by grinding boron carbide powder and zirconia balls mixed in a mass ratio of 6:1. The remaining steps and raw materials are the same as in Example 3. S2: Preparation of Pretreated Alloy Steel Matrix: The raw materials from step S1 are loaded into a melting furnace, and a vacuum is drawn until the vacuum degree inside the furnace is <40Pa. The raw materials are heated until they are completely melted and no bubbles overflow from the surface of the molten pool. Then, the furnace is held at a vacuum degree <0.1Pa and 1620℃ for 1.5 hours. After casting and cooling, a steel ingot is obtained. The ingot is placed in a heating furnace and preheated at 600℃ for 1 hour, then heated to 1150℃ and held for 3.5 hours to complete the homogenization treatment. The homogenized steel ingot is then forged. The initial forging temperature is 1200℃, and the final forging temperature is 1000℃. The deformation amount in each forging pass is 15%. After each forging pass, the steel ingot is reheated to 1200℃ in the furnace. After forging, it is placed in sand for slow cooling. The forged steel ingot is held at 920℃ for 1 hour, then oil-cooled, and then held at 450℃ for 2 hours. After air cooling, an alloy steel matrix is ​​obtained. The alloy steel matrix is ​​then subjected to ultrasonic shot peening to obtain a pretreated alloy steel matrix. The shot used in the ultrasonic shot peening is a mixed grinding medium with a diameter of 4 mm, an ultrasonic frequency of 20 kHz, an ultrasonic amplitude of 40 μm, and a shot peening time of 5 min. The mixed grinding medium is prepared by grinding a mixture of boron carbide powder and zirconia balls at a mass ratio of 6:1.

[0063] The high-strength wear-resistant alloy steel for track plates prepared in Examples 1-3 and Comparative Examples 1-10 were subjected to mechanical property, wear resistance, corrosion resistance, and adhesion tests. Mechanical property tests included hardness testing according to GB / T 230.1-2018, impact toughness testing according to GB / T 229-2020, and tensile strength and yield strength testing according to GB / T 228.1-2010. Wear resistance tests were conducted using an MS-T3000 ball-and-disc friction and wear testing machine to measure the surface dry friction coefficient of the high-strength wear-resistant alloy steel for track plates prepared in Examples 1-3 and Comparative Examples 1-10. The experimental load was 300g, the rotation speed was 300r / min, and the test time was 30min. Average values ​​were calculated at 10min, 20min, and 30min to obtain the surface friction coefficient. The tests were conducted according to GB / T... The corrosion resistance performance was tested according to standard 10125-2021. The specific test procedure was as follows: the test was conducted on a QY-90A salt spray tester. The salt spray was a NaCl solution with a mass fraction of 5% and a pH value of 6. The test temperature was 35℃, and the salt spray resistance time was recorded. The coating adhesion was tested according to standard GB / T 9286-2021. The test results are shown in Table 1 below. Table 1 Performance parameters of high-strength wear-resistant alloy steel for track plates prepared in Examples 1-3 and Comparative Examples 1-10

[0064] As shown in Table 1 above, comparing Comparative Examples 1-5 and Example 3, the test results of high-strength wear-resistant alloy steel for track plates prepared by replacing the fluorinated compound with 4-trifluoromethylbenzoic acid or perfluoroadipic acid by the same mass, or replacing the nanofiller with nano-zirconium dioxide or nano-alumina by the same mass, or using a 1:1 mass ratio of nanofiller and graphene oxide as the reinforcing material, are worse than those of Example 3. This indicates that the fluorinated compound composed of a mixture of 4-trifluoromethylbenzoic acid and perfluoroadipic acid has... It has a synergistic effect, which can effectively improve the corrosion resistance, thermal stability and mechanical properties of epoxy resin; the nanofiller composed of nano-zirconia and nano-alumina can play a synergistic role, which can significantly improve the mechanical properties and wear resistance of epoxy resin; by coating the nanofiller with polydopamine and then combining it with graphene oxide, the dispersibility of the nanofiller can be increased, agglomeration can be prevented, and the mechanical properties, wear resistance, corrosion resistance and thermal stability of alloy steel can be further improved, and it also has a good influence on the adhesion of the coating. Comparing Comparative Examples 6-8 and Example 3, it can be seen that the functional reinforcing material is composed of a 1:1 mass ratio of carboxyl-terminated hyperbranched polyester and reinforcing material, or the functional reinforcing material can be replaced by an equal mass of carboxyl-terminated hyperbranched polyester or reinforcing material. The test results for the high-strength wear-resistant alloy steel used in track plates are worse than those of Example 3. This indicates that chemically combining carboxyl-terminated hyperbranched polyester and reinforcing material can increase the bonding force between them, thereby improving the compatibility between the reinforcing material and epoxy resin, further enhancing the wear resistance, corrosion resistance, and mechanical properties of the alloy steel. It can also increase the adhesion between the coating and the alloy steel substrate. Combining carboxyl-terminated hyperbranched polyester and reinforcing material to obtain a functional reinforcing material, and adding it to epoxy resin, can effectively improve the mechanical properties, wear resistance, corrosion resistance, and thermal stability of the epoxy resin, and can also improve the adhesion between the coating and the alloy steel substrate, further enhancing the overall performance of the alloy steel. Comparing Comparative Examples 9-10 and Example 3, it can be seen that in step S2, the mixed grinding media used in ultrasonic shot peening is prepared by grinding titanium nitride powder and zirconia balls mixed in a mass ratio of 6:1, or by grinding boron carbide powder and zirconia balls mixed in a mass ratio of 6:1. The test results for the high-strength wear-resistant alloy steel used in the final preparation of track plates are worse than those of Example 3. This indicates that the mixed grinding media in ultrasonic shot peening, prepared by grinding titanium nitride powder, boron carbide powder, and zirconia balls mixed in a certain mass ratio, can effectively improve the mechanical strength, toughness, and wear resistance of the alloy steel. It can also improve the corrosion resistance and thermal stability of the alloy steel, and has a good influence on the adhesion between the coating and the alloy steel substrate.

[0065] As shown in Table 1 above, the high-strength wear-resistant alloy steel for track plates prepared in Examples 1-3, compared to the high-strength wear-resistant alloy steel for track plates prepared in Comparative Examples 1-10, achieved the required performance by strengthening the alloy steel substrate with ultrasonic shot peening, followed by sandblasting, and then spraying with epoxy resin composite material and curing. This indicates that the high-strength wear-resistant alloy steel for track plates prepared in this invention not only possesses better mechanical strength, toughness, wear resistance, corrosion resistance, and thermal stability, but also exhibits better adhesion between the coating and the alloy steel substrate, extending the service life of the alloy steel and demonstrating superior overall performance.

[0066] In the description of this specification, the references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0067] The above description is merely an example and illustration of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described or use similar methods to replace them, as long as they do not deviate from the invention or exceed the scope defined by the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A method for preparing high-strength wear-resistant alloy steel for track plates, characterized in that, Includes the following steps: S1: Raw materials: By weight percentage, it includes the following components: carbon 0.2-0.24%, aluminum 0.03-0.05%, manganese 1.2-1.4%, chromium 0.7-0.9%, molybdenum 0.2-0.3%, phosphorus 0.01-0.012%, sulfur 0.001-0.003%, niobium 0.05-0.15%, titanium 0.01-0.02%, with the balance being iron and other unavoidable impurities; S2: Preparation of pretreated alloy steel matrix: The raw materials in step S1 are smelted to obtain steel ingots. The steel ingots are homogenized, forged and heat-treated to obtain alloy steel matrix. The alloy steel matrix is ​​subjected to ultrasonic shot peening to obtain pretreated alloy steel matrix. S3: Preparation of high-strength wear-resistant alloy steel for track plates: After sandblasting the pretreated alloy steel substrate in step S2, epoxy resin composite material is sprayed on it and cured to obtain high-strength wear-resistant alloy steel for track plates. The epoxy resin composite material is prepared by uniformly mixing epoxy resin, functional reinforcing materials and curing agent.

2. The method for preparing high-strength wear-resistant alloy steel for track plates according to claim 1, characterized in that, In step S2, the conditions for ultrasonic shot peening are as follows: the shot used in ultrasonic shot peening is a mixed grinding medium, the shot diameter is 3-4 mm, the ultrasonic frequency is 20 kHz, the ultrasonic amplitude is 20-40 μm, and the shot peening time is 3-5 min.

3. The method for preparing high-strength wear-resistant alloy steel for track plates according to claim 2, characterized in that, The mixed grinding media is prepared by grinding titanium nitride powder, boron carbide powder and zirconium oxide balls in a mass ratio of 3-4:2:

1.

4. The method for preparing high-strength wear-resistant alloy steel for track plates according to claim 1, characterized in that, The preparation method of the epoxy resin composite material includes the following steps: The epoxy resin and functional reinforcing material are mixed and stirred for 0.5-1 hour. Then, the curing agent is added and stirred evenly. Finally, vacuum degassing is performed to obtain the epoxy resin composite material.

5. The method for preparing high-strength wear-resistant alloy steel for track plates according to claim 4, characterized in that, The preparation method of the functional enhancement material includes the following steps: Carboxyl-terminated hyperbranched polyester was added to a mixed solvent of N,N-dimethylformamide and isobutanol and ultrasonically dispersed. Then, reinforcing material and p-toluenesulfonic acid were added, and the mixture was stirred under nitrogen protection. After the reaction was completed, the mixture was cooled to room temperature, filtered through a filter membrane, washed with acetone, and finally vacuum dried to obtain the functional reinforcing material.

6. The method for preparing high-strength wear-resistant alloy steel for track plates according to claim 5, characterized in that, The preparation method of the carboxyl-terminated hyperbranched polyester includes the following steps: A fluorinated compound was added to a mixed solvent of N,N-dimethylformamide and isobutanol and stirred. Then, bisphenol A diglycidyl ether and a catalyst were added, and the reaction was stirred under nitrogen protection. After the reaction was completed, the mixture was cooled to room temperature and then added to deionized water to precipitate the product. After filtration, the product was washed with a mixed solution of tetrahydrofuran and ethanol and finally dried under vacuum to obtain a carboxyl-terminated hyperbranched polyester.

7. The method for preparing high-strength wear-resistant alloy steel for track plates according to claim 6, characterized in that, The fluorinated compound is composed of 4-trifluoromethylbenzoic acid and perfluoroadipic acid in a mass ratio of 0.9-1.1:0.4-0.

6.

8. The method for preparing high-strength wear-resistant alloy steel for track plates according to claim 5, characterized in that, The method for preparing the reinforcing material includes the following steps: A1: The nanofiller was added to Tris buffer solution and sonicated. Dopamine was then added and the mixture was stirred. After the reaction was completed, the nanofiller was centrifuged, washed with anhydrous ethanol, and finally vacuum dried to obtain the modified nanofiller. A2: The modified nanofiller was added to Tris buffer solution and sonicated. Then graphene oxide was added and stirred. After the reaction was completed, the mixture was centrifuged, washed with anhydrous ethanol, and finally vacuum dried to obtain the reinforced material.

9. The method for preparing high-strength wear-resistant alloy steel for track plates according to claim 8, characterized in that, In step A1, the nanofiller is composed of nano-zirconia and nano-alumina mixed in a mass ratio of 0.7-0.8:0.5-0.

6.

10. A high-strength wear-resistant alloy steel for track plates prepared by the preparation method according to any one of claims 1-9.

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