High-strength wear-resistant composite steel plate and preparation process thereof

Abstract

The invention discloses a high-strength wear-resistant composite steel plate and a preparation process thereof, and relates to the technical field of metal materials. The mechanical property of the composite steel plate is improved by treating the surface of the steel billet; a transition layer is formed by laser cladding of nickel-based alloy on the surface of a high-strength steel plate, so that interface defects caused by large thermal expansion coefficient difference between a ceramic phase and a metal substrate after subsequent thermal spraying of composite ceramic powder are prevented; through thermal spraying, a ceramic layer is formed on the surface of a transition layer, element mutual diffusion occurs at an interface, chromium, nickel, rare earth elements and the like in the transition layer are diffused into the ceramic layer, elements such as Al, Zr and the like in the ceramic layer migrate to the transition layer, metallurgical bonding is performed, crystal grains are purified, interface energy is reduced, the form of inclusions is improved, and interface bonding strength is improved; and the transition layer and the ceramic layer generate a synergistic effect to induce crack deflection and hinder crack propagation, so that the fracture resistance of the steel plate is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal materials, and in particular relates to a high-strength wear-resistant composite steel plate and a preparation process thereof. BACKGROUND

[0002] In recent years, with the rapid development of modern industry, the requirements for material performance in various industries are increasing, and traditional metal materials are difficult to meet the dual requirements of high strength and wear resistance of engineering structures. As a new type of steel plate material, the composite steel plate is widely used in technical fields such as mining machinery, coal mining and transportation, engineering machinery, building materials, power machinery, and railway transportation due to its high strength and stable structure.

[0003] In the existing technology for preparing high-strength steel materials, martensitic wear-resistant steel plates with high hardness can be obtained through quenching process, and bainite structure can be obtained through isothermal treatment, which shows higher wear resistance under the condition of slightly lower hardness than martensitic steel plate. However, there are still defects such as difficulty in balancing wear resistance and strength and toughness, difficulty in controlling residual stress, and difficulty in meeting lightweight requirements. The preparation of ceramic coating on the surface of the steel plate can enhance the corrosion resistance, high temperature resistance and wear resistance of the material, but the inherent brittleness of ceramic materials will cause pores and cracks in the production process, which seriously affects the mechanical properties of the material. Therefore, the present application proposes a high-strength wear-resistant composite steel plate and a preparation process thereof to solve the above technical problems. SUMMARY

[0004] The purpose of the present application is to provide a high-strength wear-resistant composite steel plate and a preparation process thereof to solve the problems in the prior art.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical solutions: A high-strength wear-resistant composite steel plate, comprising a high-strength steel plate and a wear-resistant layer arranged on the surface of the high-strength steel plate.

[0006] Further, the wear-resistant layer is a single layer, and the thickness of the wear-resistant layer is 500-800 microns.

[0007] A preparation process of a high-strength wear-resistant composite steel plate, comprising the following processes: S1: taking a steel blank, cleaning, heat treating, and obtaining a high-strength steel plate; S2: laser cladding a nickel-based alloy on the surface of the high-strength steel plate, then thermal spraying composite ceramic powder, post-treatment, forming a wear-resistant layer, and obtaining a high-strength wear-resistant composite steel plate.

[0008] Furthermore, the steel billet comprises the following mass composition: 0.25~0.55% carbon, 0.18~0.40% silicon, 1.40~1.60% manganese, 0.60~1.20% chromium, 0.03~0.04% titanium, 0.05~0.2% vanadium, 0.15~0.30% molybdenum, sulfur ≤0.005%, phosphorus ≤0.007%, with the balance being iron.

[0009] Furthermore, the nickel-based alloy comprises the following mass composition: 16-22% chromium, 3-8% aluminum, 0.02-0.06% rare earth elements, with the balance being nickel.

[0010] Furthermore, the rare earth element is any one or more of cerium, neodymium, lanthanum, and yttrium.

[0011] In the above technical solution, carbon, as a basic strengthening element, improves the strength of the composite steel plate through solid solution strengthening and carbide formation. Chromium, molybdenum, and vanadium, as carbide-forming elements, can refine the grains, improve the hardenability and tempering stability of the steel. Vanadium-formed carbides maintain stability at high temperatures, which helps improve the thermal stability and wear resistance of the material. The addition of titanium can refine the grains and act as a deoxidizer to reduce cold brittleness. Vacuum degassing can effectively remove gases such as hydrogen and oxygen from the steel, reduce porosity and inclusions, and improve the purity and density of the steel billet. By laser cladding a nickel-based alloy onto the surface of the high-strength steel plate to form a transition layer, interface defects caused by the large difference in thermal expansion coefficients between the ceramic phase and the metal substrate after subsequent thermal spraying of composite ceramic powder are prevented. Through thermal spraying, a ceramic layer is formed on the surface of the transition layer, and elemental reactions occur at the interface. Interdiffusion occurs, with chromium, nickel, and rare earth elements in the transition layer diffusing into the ceramic layer, while elements such as Al and Zr in the ceramic layer migrate into the transition layer. This results in metallurgical bonding, forming intermetallic compounds (such as Ni-Cr-Al and Cr2O3) and rare earth compounds (such as Y-ZrO2 and Ce-ZrO2). This improves the dispersion uniformity of the components in the transition layer. Rare earth elements can purify grains, reduce interfacial energy, and improve the morphology of inclusions. They preferentially agglomerate at grain boundaries and phase boundaries, increasing interfacial bonding strength. However, excessive content can form a diffusion barrier, hindering the diffusion of carbon elements and reducing toughness and plasticity. Therefore, the rare earth element content is controlled at 0.01~0.05%. The transition layer and the ceramic layer have a synergistic effect, inducing crack deflection, hindering crack propagation, and improving the fracture resistance of the steel plate, resulting in a wear-resistant and high-strength composite steel plate.

[0012] Furthermore, in step S1, the heat treatment process conditions are as follows: first, heat to 600~680℃ and hold for 1.5~3h, then heat to 920~1000℃ and hold for 1~2h, then water cool to 60~70℃ and hold for 2~3h, then heat to 200~500℃ and hold for 2~3h, and finally remove and air cool to room temperature.

[0013] In the above technical solution, heat treatment is used to homogenize the grains of the composite steel plate, and the heat preservation process is used to achieve spheroidization of carbides and homogenization of the microstructure. This eliminates the internal stress generated in the steel during processing, reduces the tendency to deform during subsequent quenching, and then a rapid cooling quenching process is used to improve the strength of the steel. The cooling temperature is controlled to avoid excessive stress caused by complete quenching to room temperature, reducing the risk of deformation and cracking, lowering internal stress and brittleness, refining the grains, and improving the mechanical properties of the composite steel plate.

[0014] Furthermore, in step S2, the laser cladding process conditions are as follows: laser power of 3~4kW, scanning speed of 600~650mm / min, spot diameter of 5~6mm, laser absorption rate of 0.3~0.4, and initial temperature of 20~25℃.

[0015] Furthermore, in step S2, the thermal spraying process conditions are as follows: plasma spraying is used, with argon as the protective atmosphere, an argon flow rate of 40~45L / min, a pressure of 70~75V, a current of 600~630A, a powder feed rate of 20~50g / min, and a spraying distance of 100~120mm.

[0016] Furthermore, the composite ceramic powder is prepared by the following process: ATZ (alumina-toughened zirconia) material is mixed with a pore-forming agent, deionized water and a dispersant are added, the mixture is dispersed, a binder is added, the mixture is stirred, spray-dried, and then placed in a furnace at 500~550℃ for 1~1.5h. After sieving, composite ceramic powder is obtained.

[0017] Furthermore, the pore-forming agent is sodium aluminate.

[0018] Furthermore, the dispersant is polyacrylic acid (PAA).

[0019] Furthermore, the adhesive is polyvinyl alcohol (PVA).

[0020] Furthermore, the particle size of the alumina-toughened zirconium oxide is 0.5~1μm.

[0021] Furthermore, the particle size of the composite ceramic powder is 20~40μm.

[0022] In the above technical solution, a spray drying process is used to atomize the ceramic powder dispersion system into small droplets, forming a core-shell structure containing alumina and sodium aluminate. Dispersant PAA is added, and its carboxyl groups generate a steric hindrance effect with the ceramic powder. Then, binder PVA is added to provide interparticle bonding force during the drying process, maintaining spherical particles. Under the action of hot air, the powder is rapidly dried to form a composite ceramic powder. Then, it is heat-treated in a muffle furnace, where sodium aluminate decomposes to generate voids, while the organic phases of the dispersant and binder are removed. Finally, abnormally large particles and incompletely coated fine powder are removed by sieving, ensuring the uniformity and consistency of the ceramic powder particles.

[0023] Furthermore, the specific post-processing process is as follows: the steel plate after thermal spraying of composite ceramic powder is subjected to ultrasonic treatment, polishing, coating with sealing agent, vacuum drying, and the above steps are repeated 2 to 3 times, and cured for 10 to 12 hours to obtain a high-strength wear-resistant composite steel plate.

[0024] Furthermore, the sealing agent is prepared by the following process: epoxy resin and perfluoropolyether are mixed, sorbitan monooleate is added, the mixture is stirred evenly, a curing agent is added, and the mixture is stirred evenly again to obtain the sealing agent.

[0025] In the above technical solution, the steel plate after thermal spraying of composite ceramic powder is pretreated to remove residual sodium aluminate from the surface of the ceramic powder, providing more active sites for subsequent coating of sealing agent, while avoiding interface defects caused by sodium aluminate residue and improving the adhesion of the wear-resistant layer; through grinding and polishing, the surface peak-valve difference is reduced, the sealing agent is evenly distributed, the self-lubricating properties of the wear-resistant layer are optimized, stress concentration leading to cracks is prevented, and interface defects are avoided; through repeated post-treatment operations, the sealing agent is penetrated into the ceramic layer in small amounts and multiple times, which not only retains the wear resistance, corrosion resistance, and chemical stability of the ceramic powder, but also endows it with self-lubricating properties, significantly reducing the porosity of the ceramic layer and the risk of microcrack formation, improving the density of the ceramic layer, thereby enhancing the wear resistance and corrosion resistance of the steel plate.

[0026] Furthermore, the mass ratio of ATZ material, pore-forming agent, deionized water, dispersant, and binder is 4:1:7.5:(0.05~0.07):0.03.

[0027] Furthermore, the volume ratio of epoxy resin, polytetrafluoroethylene, sorbitan monooleate, and curing agent is 3:1:(0.15~0.2):(0.2~0.4).

[0028] Furthermore, the curing agent is SH-K700.

[0029] Compared with the prior art, the beneficial effects of the present invention are: 1. The high-strength wear-resistant composite steel plate of the present invention forms a transition layer by laser cladding a nickel-based alloy on the surface of the high-strength steel plate. This prevents interface defects caused by the large difference in thermal expansion coefficients between the ceramic phase and the metal substrate after subsequent thermal spraying of composite ceramic powder. Through thermal spraying, a ceramic layer is formed on the surface of the transition layer. Element interdiffusion occurs at the interface, with chromium, nickel, and rare earth elements in the transition layer diffusing into the ceramic layer, and elements such as Al and Zr in the ceramic layer migrating into the transition layer. This results in metallurgical bonding, forming intermetallic compounds (such as Ni-Cr-Al and Cr2O3) and rare earth elements. Compounds (such as Y-ZrO2 and Ce-ZrO2) improve the dispersion uniformity of each component in the transition layer. Rare earth elements can purify grains, reduce interfacial energy, improve the morphology of inclusions, preferentially agglomerate at grain boundaries and phase boundaries, and improve interfacial bonding strength. However, excessive content will form a diffusion barrier, hindering the diffusion of carbon elements and reducing toughness and plasticity. Therefore, the rare earth element content is controlled at 0.01~0.05%. The transition layer and the ceramic layer have a synergistic effect, inducing crack deflection, hindering crack propagation, improving the fracture resistance of the steel plate, and obtaining a wear-resistant and high-strength composite steel plate.

[0030] 2. The high-strength wear-resistant composite steel plate of the present invention achieves uniform grain size through heat treatment, spheroidization of carbides and uniform microstructure through heat preservation process, eliminates internal stress generated in the steel during processing, reduces deformation tendency in subsequent quenching process, and then improves the strength of the steel through rapid cooling quenching process, controls the cooling temperature to avoid excessive stress generated by complete quenching to room temperature, reduces the risk of deformation and cracking, reduces internal stress and brittleness, refines grain size, and improves the mechanical properties of the composite steel plate.

[0031] 3. The high-strength wear-resistant composite steel plate of the present invention utilizes a spray drying process to atomize a ceramic powder dispersion system into small droplets, forming a core-shell structure containing alumina and sodium aluminate. Dispersant PAA is added, whose carboxyl groups create a steric hindrance effect with the ceramic powder. Then, binder PVA is added to provide interparticle bonding during drying, maintaining spherical particles. Under hot air, the mixture is rapidly dried to form composite ceramic powder. This is followed by muffle furnace heat treatment, where sodium aluminate decomposes to create voids, while simultaneously removing the organic phases of the dispersant and binder. Sieving removes abnormally large particles and incompletely coated fine powder, ensuring the uniformity and consistency of the ceramic powder particles. Repeated post-treatment operations allow the sealing agent to penetrate the ceramic layer in small amounts multiple times, preserving the wear resistance, corrosion resistance, and chemical stability of the ceramic powder while imparting self-lubricating properties. This significantly reduces the porosity of the ceramic layer and the risk of microcrack formation, improving the density of the ceramic layer and thus enhancing the wear resistance and corrosion resistance of the steel plate. Detailed Implementation

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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 skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] In the following specific implementation: ATZ material, model NZC8, average particle size 0.8mm; Silica, type HL-150, purity ≥99.8%; Pure tungsten powder, grade FW-1, purity ≥99.95%; The nickel-based alloy comprises the following components by weight: 17% chromium, 3% aluminum, 0.02% yttrium, with the balance being nickel; The pore-forming agent is sodium aluminate, CAS: 11138-49-1; The dispersant is PAA (polyacrylic acid), with a solid content ≥50.0% and a density ≥1.20. The adhesive is PVA (polyvinyl alcohol), CAS: 9002-89-5; The curing agent is SH-K700; The average thickness of the wear-resistant layer is 600 μm; The steel billet contains the following components by weight: 0.46% carbon, 0.35% silicon, 1.40% manganese, 0.60% chromium, 0.03% titanium, 0.05% vanadium, 0.15% molybdenum, sulfur ≤0.005%, phosphorus ≤0.007%, and the balance is iron.

[0034] Example 1: A preparation process for a high-strength wear-resistant composite steel plate, comprising the following processes: S1: Take a steel billet, clean it, first heat it to 600℃ and hold it for 1.5 hours, then heat it to 920℃ and hold it for 1 hour, then water cool it to 60℃ and hold it for 2 hours, then heat it to 200℃ and hold it for 2 hours, take it out and air cool it to room temperature to obtain a high-strength steel plate. S2: A nickel-based alloy is laser-clad onto the surface of a high-strength steel plate. The laser power is 3kW, the scanning speed is 600mm / min, the spot diameter is 5mm, the laser absorption rate is 0.3, and the initial temperature is 20℃. Then, composite ceramic powder is thermally sprayed using a plasma spraying process with argon as the protective atmosphere. The argon flow rate is 40L / min, the pressure is 70V, the current is 600A, the powder feed rate is 20g / min, and the spraying distance is 100mm. After post-treatment, a wear-resistant layer is formed, resulting in a high-strength wear-resistant composite steel plate. Composite ceramic powder is prepared by the following process: ATZ material was mixed with a pore-forming agent, deionized water and a dispersant were added, the mixture was dispersed, a binder was added, the mixture was stirred, spray-dried, and then placed in a furnace at 500℃ for 1 hour. After sieving, a composite ceramic powder with an average particle size of 20 μm was obtained. The mass ratio of ATZ material, pore-forming agent, deionized water, dispersant and binder was 4:1:7.5:0.05:0.03. The specific post-processing process is as follows: the steel plate after thermal spraying of composite ceramic powder is ultrasonically treated, polished, coated with sealing agent, vacuum dried, the above steps are repeated twice, and cured for 10 hours to obtain a high-strength wear-resistant composite steel plate. The sealing agent is prepared by the following process: epoxy resin and perfluoropolyether are mixed, sorbitan monooleate is added, and the mixture is stirred evenly. Then, a curing agent is added and the mixture is stirred evenly again to obtain the sealing agent. The volume ratio of epoxy resin, polytetrafluoroethylene, sorbitan monooleate, and curing agent is 3:1:0.15:0.2.

[0035] Example 2: A preparation process for a high-strength wear-resistant composite steel plate, comprising the following processes: S1: Take a steel billet, clean it, first heat it to 650℃ and hold it for 2 hours, then heat it to 950℃ and hold it for 1.5 hours, then water cool it to 65℃ and hold it for 2.5 hours, then heat it to 300℃ and hold it for 2.5 hours, take it out and air cool it to room temperature to obtain a high-strength steel plate. S2: A nickel-based alloy is laser-clad onto the surface of a high-strength steel plate. The laser power is 3kW, the scanning speed is 620mm / min, the spot diameter is 5mm, the laser absorption rate is 0.3, and the initial temperature is 20℃. Then, composite ceramic powder is thermally sprayed using a plasma spraying process with argon as the protective atmosphere. The argon flow rate is 40L / min, the pressure is 70V, the current is 600A, the powder feed rate is 20g / min, and the spraying distance is 100mm. After post-treatment, a wear-resistant layer is formed, resulting in a high-strength wear-resistant composite steel plate. Composite ceramic powder is prepared by the following process: ATZ material was mixed with a pore-forming agent, deionized water and a dispersant were added, the mixture was dispersed, a binder was added, the mixture was stirred, spray-dried, and then placed in a furnace at 520℃ for 1 hour. After sieving, a composite ceramic powder with an average particle size of 30μm was obtained. The mass ratio of ATZ material, pore-forming agent, deionized water, dispersant and binder was 4:1:7.5:0.06:0.03. The specific post-processing process is as follows: the steel plate after thermal spraying of composite ceramic powder is ultrasonically treated, polished, coated with sealing agent, vacuum dried, the above steps are repeated twice, and cured for 10 hours to obtain a high-strength wear-resistant composite steel plate. The sealing agent is prepared by the following process: epoxy resin and perfluoropolyether are mixed, sorbitan monooleate is added, and the mixture is stirred evenly. Then, a curing agent is added and the mixture is stirred evenly again to obtain the sealing agent. The volume ratio of epoxy resin, polytetrafluoroethylene, sorbitan monooleate, and curing agent is 3:1:0.15:0.3.

[0036] Example 3: A preparation process for a high-strength wear-resistant composite steel plate, comprising the following processes: S1: Take a steel billet, clean it, first heat it to 680℃ and hold it for 3 hours, then heat it to 1000℃ and hold it for 2 hours, then water cool it to 70℃ and hold it for 3 hours, then heat it to 500℃ and hold it for 3 hours, then take it out and air cool it to room temperature to obtain a high-strength steel plate. S2: A nickel-based alloy is laser-clad onto the surface of a high-strength steel plate. The laser power is 4kW, the scanning speed is 650mm / min, the spot diameter is 6mm, the laser absorption rate is 0.4, and the initial temperature is 25℃. Then, composite ceramic powder is thermally sprayed using a plasma spraying process with argon as the protective atmosphere. The argon flow rate is 45L / min, the pressure is 75V, the current is 630A, the powder feed rate is 50g / min, and the spraying distance is 120mm. After post-treatment, a wear-resistant layer is formed, resulting in a high-strength wear-resistant composite steel plate. Composite ceramic powder is prepared by the following process: ATZ material was mixed with a pore-forming agent, deionized water and a dispersant were added, the mixture was dispersed, a binder was added, the mixture was stirred, spray-dried, and then placed in a furnace at 550℃ for 1.5 hours. After sieving, a composite ceramic powder with an average particle size of 40 μm was obtained. The mass ratio of ATZ material, pore-forming agent, deionized water, dispersant and binder was 4:1:7.5:0.07:0.03. The specific post-processing process is as follows: the steel plate after thermal spraying of composite ceramic powder is ultrasonically treated, polished, coated with sealing agent, vacuum dried, and the above steps are repeated 3 times and cured for 12 hours to obtain a high-strength wear-resistant composite steel plate. The sealing agent is prepared by the following process: epoxy resin and perfluoropolyether are mixed, sorbitan monooleate is added, and the mixture is stirred evenly. Then, a curing agent is added and the mixture is stirred evenly again to obtain the sealing agent. The volume ratio of epoxy resin, polytetrafluoroethylene, sorbitan monooleate, and curing agent is 3:1:0.2:0.4.

[0037] Comparative Example 1: A process for preparing a composite steel plate, comprising the following steps: S1: Take a steel billet, clean it, first heat it to 600℃ and hold it for 1.5 hours, then heat it to 920℃ and hold it for 1 hour, then water cool it to 60℃ and hold it for 2 hours, then heat it to 200℃ and hold it for 2 hours, take it out and air cool it to room temperature to obtain a high-strength steel plate. S2: A nickel-based alloy is laser-clad onto the surface of a high-strength steel plate. The laser power is 3kW, the scanning speed is 600mm / min, the spot diameter is 5mm, the laser absorption rate is 0.3, and the initial temperature is 20℃. Then, ATZ material is thermally sprayed using a plasma spraying process with argon as the protective atmosphere. The argon flow rate is 40L / min, the pressure is 70V, the current is 600A, the powder feed rate is 20g / min, and the spraying distance is 100mm. After post-treatment, a wear-resistant layer is formed, resulting in a composite steel plate. Comparative Example 2: A process for preparing a composite steel plate, comprising the following steps: S1: Take a steel billet, clean it, first heat it to 600℃ and hold it for 1.5 hours, then heat it to 920℃ and hold it for 1 hour, then water cool it to 60℃ and hold it for 2 hours, then heat it to 200℃ and hold it for 2 hours, take it out and air cool it to room temperature to obtain a high-strength steel plate. S2: Composite ceramic powder is thermally sprayed onto the surface of a high-strength steel plate using plasma spraying technology with argon as the protective atmosphere. The argon flow rate is 40L / min, the pressure is 70V, the current is 600A, the powder feed rate is 20g / min, the spraying distance is 100mm, and after post-treatment, a wear-resistant layer is formed to obtain the composite steel plate. Composite ceramic powder is prepared by the following process: ATZ material was mixed with a pore-forming agent, deionized water and a dispersant were added, the mixture was dispersed, a binder was added, the mixture was stirred, spray-dried, and then placed in a furnace at 500℃ for 1 hour. After sieving, a composite ceramic powder with an average particle size of 20 μm was obtained. The mass ratio of ATZ material, pore-forming agent, deionized water, dispersant and binder was 4:1:7.5:0.05:0.03. The specific post-processing process is as follows: the steel plate after thermal spraying of composite ceramic powder is ultrasonically treated, polished, coated with sealing agent, vacuum dried, the above steps are repeated twice, and cured for 10 hours to obtain composite steel plate. The sealing agent is prepared by the following process: epoxy resin and perfluoropolyether are mixed, sorbitan monooleate is added, and the mixture is stirred evenly. Then, a curing agent is added and the mixture is stirred evenly again to obtain the sealing agent. The volume ratio of epoxy resin, polytetrafluoroethylene, sorbitan monooleate, and curing agent is 3:1:0.15:0.2.

[0038] Comparative Example 3: A process for preparing a composite steel plate, comprising the following steps: S1: Take a steel billet, clean it, first heat it to 600℃ and hold it for 1.5 hours, then heat it to 920℃ and hold it for 1 hour, then water cool it to 60℃ and hold it for 2 hours, then heat it to 200℃ and hold it for 2 hours, take it out and air cool it to room temperature to obtain a high-strength steel plate. S2: A nickel-based alloy is laser-clad onto the surface of a high-strength steel plate. The laser power is 3kW, the scanning speed is 600mm / min, the spot diameter is 5mm, the laser absorption rate is 0.3, and the initial temperature is 20℃. A wear-resistant layer is formed, resulting in a composite steel plate. Comparative Example 4: A steel plate manufacturing process, comprising the following steps: Take a steel billet, clean it, heat it to 600℃ and hold it for 1.5 hours, then heat it to 920℃ and hold it for 1 hour, then water cool it to 60℃ and hold it for 2 hours, then heat it to 200℃ and hold it for 2 hours, then take it out and air cool it to room temperature to obtain a steel plate.

[0039] experiment: The composite steel plates obtained in Examples 1-3 and Comparative Examples 1-4 were used to prepare samples, and their properties were tested and the test results were recorded. Hardness test: Using GB / T 18449.4-2022 as the reference standard, the test sample is fixed on a steel support platform. The support surface is kept clean to ensure that no displacement occurs during the test. The hardness tester indenter is used to contact the sample. Without impact or vibration, the test force is applied in a direction perpendicular to the surface. The speed of the indenter is 30 μm / s, the test time is 8s, and the hardness is recorded. Wear rate test: Using GB / T 12444-2006 as the reference standard, under room temperature conditions, the test ring and sample are firmly installed on the spindle and fixture of the testing machine, the testing machine is started, and the wear rate is recorded. Tensile strength test: Using GB / T 228.1-2021 as the reference standard, a universal testing machine was used to test the transverse tensile force of the specimen at room temperature, and the tensile strength was recorded.

[0040] Cost-performance ratio comparison table

[0041] Based on the data in the table above, the following conclusions can be clearly drawn: The high-strength wear-resistant composite steel plates obtained in Examples 1-3 are compared with the steel plates obtained in Comparative Examples 1-4. The test results show that: Compared with Comparative Examples 1-4, the high-strength wear-resistant composite steel plates obtained in Examples 1-3 have higher hardness, lower wear rate, and higher tensile strength. Compared with Example 1, the steel plate obtained in Comparative Example 1 has lower hardness, higher wear rate, and lower tensile strength, indicating that the wear-resistant layer formed by thermal spraying ATZ material onto the smelted steel plate is insufficient to improve the wear resistance of the steel plate. It is necessary to improve the density and optimize the self-lubricating properties of the wear-resistant layer through granulation-sealing composite treatment to prevent stress concentration leading to cracks and avoid interface defects. This verifies the importance of synergistic composite ceramic phase and organic phase sealing. Compared with Example 1, the steel plate obtained in Comparative Example 2 has lower hardness, higher wear rate, and lower tensile strength, indicating that direct thermal spraying of composite ceramic powder onto high-strength steel plate significantly reduces hardness, strength, and wear resistance, verifying the necessity of laser cladding nickel-based alloy as a transition. Compared with Example 1, the steel plate obtained in Comparative Example 3 has lower hardness, higher wear rate, and lower tensile strength, indicating that surface treatment of nickel-based alloys by laser cladding alone in the raw materials will lead to coarse grains, reduced hardness, and easier wear of the steel plate, verifying the necessity of using thermal spraying composite ceramic powder. Compared with Example 1, the steel plate obtained in Comparative Example 4 has lower hardness, higher wear rate, and lower tensile strength, indicating that heat treatment alone is insufficient to improve the wear resistance of the steel plate. It is necessary to combine laser cladding and thermal spraying processes to produce metallurgical bonding in order to improve the wear resistance of the steel plate.

[0042] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A process for the production of a high-strength wear-resistant clad steel plate, characterized in that: The method comprises the following steps: S1, taking a steel blank, cleaning, heat treatment, and obtaining a high-strength steel plate; S2, laser cladding a nickel-based alloy on the surface of the high-strength steel plate, then thermal spraying a composite ceramic powder, post-treatment, forming a wear-resistant layer, and obtaining a high-strength wear-resistant composite steel plate.

2. The preparation process of high-strength wear-resistant composite steel plate according to claim 1, characterized in that: The composite ceramic powder is prepared by the following steps: The ATZ material is mixed with a pore-forming agent, deionized water and a dispersant, and then dispersed, a binder is added and stirred, and then spray dried, and then put into a 500-550 DEG C furnace for 1-1.5 h, sieved, and the composite ceramic powder is obtained; the pore-forming agent is sodium metaaluminate; the dispersant is polyacrylic acid; the binder is polyvinyl alcohol; the mass ratio of the ATZ material, the pore-forming agent, the deionized water, the dispersant and the binder is 4:1:7.5:(0.05-0.07):0.03; the particle size of the composite ceramic powder is 20-40 mu m.

3. The preparation process of high-strength wear-resistant composite steel plate according to claim 1, characterized in that: The steel blank comprises the following mass components: 0.25-0.55% carbon, 0.18-0.40% silicon, 1.40-1.60% manganese, 0.60-1.20% chromium, 0.03-0.04% titanium, 0.05-0.2% vanadium, 0.15-0.30% molybdenum, sulfur ≤0.005%, phosphorus ≤0.007%, and the balance of iron.

4. The preparation process of high-strength wear-resistant composite steel plate according to claim 1, characterized in that: In step S1, the process conditions of the heat treatment are as follows: first, heating to 600-680 DEG C and holding for 1.5-3 h, then heating to 920-1000 DEG C and holding for 1-2 h, then water cooling to 60-70 DEG C and holding for 2-3 h, then heating to 200-500 DEG C and holding for 2-3 h, and then taking out and air cooling to room temperature.

5. The preparation process of high-strength wear-resistant composite steel plate according to claim 1, characterized in that: In step S2, the process conditions of the laser cladding are as follows: the laser power is 3-4 kW, the scanning speed is 600-650 mm / min, the spot diameter is 5-6 mm, the laser absorption rate is 0.3-0.4, and the initial temperature is 20-25 DEG C.

6. The preparation process of high-strength wear-resistant composite steel plate according to claim 1, characterized in that: In step S2, the process conditions of the thermal spraying are as follows: the plasma spraying process is adopted, argon is used as the protective atmosphere, the argon flow is 40-45 L / min, the pressure is 70-75 V, the current is 600-630 A, the powder feeding rate is 20-50 g / min, and the spraying distance is 100-120 mm.

7. The preparation process of high-strength wear-resistant composite steel plate according to claim 2, characterized in that: The specific process of the post-treatment is as follows: the steel plate after the thermal spraying of the composite ceramic powder is subjected to ultrasonic treatment, grinding and polishing, coating of a pore sealing agent, vacuum drying, and repeating the above steps 2-3 times, and solidifying for 10-12 h.

8. The process for preparing a high-strength abrasion-resistant composite steel plate according to claim 7, characterized by: The pore sealing agent is prepared by the following steps: mixing epoxy resin with perfluoropolyether, adding sorbitan monooleate, stirring uniformly, then adding a curing agent, stirring again uniformly, and obtaining the pore sealing agent.

9. The process for preparing a high-strength abrasion-resistant composite steel plate according to claim 8, characterized by: The curing agent is SH-K700; the volume ratio of the epoxy resin, the polytetrafluoroethylene, the sorbitan monooleate and the curing agent is 3:1:(0.15-0.2):(0.2-0.4).

10. A high-strength abrasion-resistant clad steel plate characterized by: The method is prepared according to any one of claims 1-9.

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