High-temperature-resistant and wear-resistant rotary swaging roller and processing method thereof

Abstract

This invention discloses a high-temperature and wear-resistant rotary forging roll and its processing method. The rotary forging roll includes a substrate and a high-temperature wear-resistant layer covering the outside of the substrate; the substrate is an H13 mold steel substrate, and the high-temperature wear-resistant layer is obtained by laser 3D printing and cladding the wear-resistant and high-temperature alloy powder onto the surface of the substrate; the thickness of the high-temperature wear-resistant layer is 0.5mm to 2.5mm. The processing method of the high-temperature and wear-resistant rotary forging roll includes: S1, substrate surface pretreatment; S2, laser 3D printing of the high-temperature wear-resistant layer; S3, cooling. This invention uses specific wear-resistant and high-temperature alloy powder as raw material and a printing method with specific parameters to 3D print on the surface of the H13 rotary forging roll substrate. The printed layer has a dense structure, is free of cracks and pores, forms a good metallurgical bond with the rotary forging roll substrate surface, and has high hardness and excellent wear resistance under both room temperature and high temperature conditions. This effectively improves the problem of easy plastic extrusion wear of rotary forging rolls at high temperatures and increases the service life of rotary forging rolls.

Description

Technical Field

[0001] This invention relates to a rotary forging roll, specifically to a high-temperature resistant and wear-resistant rotary forging roll and its processing method. Background Technology

[0002] Rotary forging, also known as rotary cutting roll forging, is a commonly used metal processing technology that can efficiently process various metal materials such as steel, aluminum alloys, and titanium alloys. Therefore, it is widely used in various fields of forging and cold working. The equipment used for rotary forging is a rotary forging machine, which typically employs two rotary forging rolls (an active rotary forging roll and a passive rotary forging roll) as its main working components. By varying the rotational speeds and the difference in elongation between the two rolls, and through continuous rolling deformation of the metal material, the shape of the metal part is changed and its structure optimized. During rotary forging, the rotary forging rolls are the main load-bearing components. Due to the typically high temperatures and harsh working conditions, they are prone to high-temperature wear, leading to roll failure.

[0003] Currently, rotary forging rolls are typically manufactured from H13 die steel through rolling and quenching processes. The main components of H13 die steel include: C 0.35%-0.45%, Si 0.80%-1.20%, Mn 0.20%-0.50%, Cr 4.75%-5.50%, Mo 1.10%-1.75%, V 0.90%-1.20%, Ni ≤0.20%, P ≤0.020%, and S ≤0.020%. The hardness of the H13 roll blank is ≤28 HRC, and after quenching, the hardness is around HRC55. It possesses good hardness and toughness, but its high-temperature wear resistance is insufficient. Especially when the temperature of the rotary forging working surface reaches 500℃, the rotary forging roll will experience severe plastic extrusion wear and premature failure. Therefore, how to improve the high-temperature wear resistance of rotary forging rolls and extend their service life under harsh high-temperature conditions has become one of the key focuses of current research and development.

[0004] Laser metal 3D printing technology, a type of rapid prototyping technology, is a technique that uses digital model files as a basis and powdered metal or other printing materials to construct objects layer by layer. Laser metal 3D printing technology has advantages such as high manufacturing speed, low production cost, and high manufacturing precision. This has inspired researchers to combine 3D printing technology with the high-temperature wear resistance requirements of rotary forging rolls, attempting to deposit thicker, stronger printed layers on the surface of the rotary forging rolls to resist rapid wear caused by high temperatures. However, this method still faces many challenges, the biggest being the selection of printing materials. It is necessary to consider not only the strength, high-temperature resistance, and wear resistance of the printed layer itself, but also the bonding between the printed layer and the H13 rotary forging roll substrate to prevent cracking between the printed layer and the substrate.

[0005] Analysis revealed that the cracking between the wear-resistant layer and the rotary forging roll substrate was mainly caused by the following factors:

[0006] 1. During laser metal 3D printing, the heating and cooling processes generate significant thermal stress and phase transformation stress. Due to the differences in materials and thermal expansion coefficients between the printed layer and the internal materials, the solid-state phase transformation tendency, synchronization degree, and amplitude between the printed layer and the rotary forging roll substrate (H13) differ considerably during printing. The printed layer is mainly composed of nickel-based materials, which do not undergo phase transformation. However, H13 steel has a strong self-quenching ability and will undergo martensitic phase transformation after heating. The martensitic phase transformation will generate significant tensile stress on the printed layer, increasing the tendency to crack.

[0007] 2. When the printed layers are bonded, they mainly grow in the form of columnar crystals along the direction of heat flow at the bonding interface. Impurities tend to accumulate at the interface between adjacent columnar crystals, and stress concentration occurs at the accumulation points, which can easily lead to cracking.

[0008] 3. The bonding speed during laser 3D printing is very fast, which sometimes causes insufficient liquid replenishment in the post-crystallization area inside the printed layer, resulting in tensile stress, which also increases the tendency to generate cracks.

[0009] 4. Since the printed layer is formed by multi-scan printing, the overlapping of multiple scans causes the surface of the printed layer to change from compressive stress to tensile stress. At the same time, columnar dendrites are superimposed or connected at the overlap, and stress concentration and low fracture strength are likely to occur at the grain boundary, so cracks are prone to occur in the overlap area.

[0010] 5. The quenched H13 rotary forging roll substrate has good thermal conductivity, low specific heat capacity, poor wettability, and a hard oxide film on the surface, resulting in a high reflectivity of the laser spot. This makes it difficult for the heat generated by the laser to remain on its surface. The performance difference between the quenched H13 rotary forging roll substrate and the material system of the printing layer is significant, leading to serious failure problems during the printing process.

[0011] Due to the aforementioned reasons and practical difficulties, the selection of printing materials and printing processes have a decisive impact on the high-temperature wear resistance of the printed rotary forging rolls, and have become the current bottleneck problem. Summary of the Invention

[0012] The technical problem to be solved by the present invention is to provide a high-temperature wear-resistant rotary forging roll and its processing method. The high-temperature wear-resistant layer formed by laser 3D printing has a dense structure, no cracks and no pores, and can form a good metallurgical bond with the surface of the H13 rotary forging roll substrate.

[0013] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0014] A high-temperature wear-resistant rotary forging roll includes a base and a high-temperature wear-resistant layer covering the outside of the base; the base is an H13 die steel base, and the high-temperature wear-resistant layer is obtained by laser 3D printing and cladding wear-resistant and high-temperature alloy powder onto the surface of the base.

[0015] The thickness of the high-temperature wear-resistant layer is 0.5mm to 2.5mm, preferably 1.0mm to 2.0mm.

[0016] A method for processing a high-temperature and wear-resistant rotary forging roll includes the following steps:

[0017] S1. Substrate surface pretreatment

[0018] The substrate surface is polished and cleaned to remove the oxide layer, oil stains and other contaminants.

[0019] S2, Laser 3D Printed High-Temperature Wear-Resistant Layer

[0020] Using wear-resistant and high-temperature resistant alloy powder as the printing material, laser metal 3D printing technology is used to perform layer-by-layer laser 3D printing on the pre-treated substrate surface until the printing layer thickness reaches the design thickness.

[0021] S3, Cooling

[0022] After the forging roll has been printed, it can be cooled down until it is completely cooled to produce a high-temperature wear-resistant forging roll.

[0023] The specific process of step S1 is as follows: first, the surface of the rotary forging roll substrate is polished using a polishing device. After the oxide layer on the surface of the rotary forging roll substrate is polished clean and the substrate surface is smooth and glossy, the surface of the rotary forging roll substrate is cleaned with a decontaminant to remove oil stains and other contaminants.

[0024] The specific process of step S2 is as follows: a laser coaxial powder feeder is used to feed wear-resistant and high-temperature resistant alloy powder to the surface of the rotary forging roll substrate, and a laser is used to perform layer-by-layer laser 3D printing; the laser is a fiber laser, and the 3D printing adopts a multi-pass single-layer forming process.

[0025] The process parameters of the fiber laser are as follows: focal length of focusing lens f = 250mm~300mm, printing power P = 8000W, spot diameter D = 0.3mm~1.2mm, printing scanning speed V = 400mm / s~600mm / s, and overlap rate θ = 40%.

[0026] The specific composition of the wear-resistant and high-temperature resistant alloy powder includes the following components by weight percentage: Ni: 20.0%–30.0%; C: 5.0%–12.0%; Cr: 6.0%–10.0%; Co: 12.0%–16.0%; B: 2.0%–5.0%; Si: 2.0%–6.0%; P: 2.0%–3.0%; W: 8.0%–12.0%; Be: 3.0%–5.0%; Mn: 1.0%–2.0%; the balance is Fe, and the Fe content is not less than 7.0%.

[0027] Preferably, the specific composition of the wear-resistant and high-temperature alloy powder includes the following components by weight percentage: Ni: 25.0%–29.0%; C: 6.0%–10.0%; Cr: 8.0%–9.5%; Co: 13.0%–16.0%; B: 2.5%–4.5%; Si: 3.0%–5.0%; P: 2.3%–2.8%; W: 8.0%–10.0%; Be: 3.5%–4.5%; Mn: 1.0%–1.6%; with the balance being Fe.

[0028] The wear-resistant and high-temperature resistant alloy powder is a regular spherical powder, and the proportion of spherical powder with a particle size of 45μm-120μm in the wear-resistant and high-temperature resistant alloy powder is not less than 90%.

[0029] The technological advancements achieved by this invention due to the adoption of the above technical solutions are as follows:

[0030] This invention provides a high-temperature and wear-resistant rotary forging roll and its processing method. Using specific wear-resistant and high-temperature alloy powder as raw material and a printing method with specific parameters, 3D printing is performed on the surface of an H13 rotary forging roll substrate. The printed layer has a dense structure, free of cracks and pores, and forms a good metallurgical bond with the rotary forging roll substrate surface. It also exhibits high hardness and excellent wear resistance under both room temperature and high-temperature conditions. This effectively improves the problem of easy plastic extrusion wear of rotary forging rolls at high temperatures, increases the service life of the rotary forging roll, and also improves the yield rate of rotary forgings under high-temperature environments, meeting the needs of industrial production.

[0031] In the wear-resistant and high-temperature alloy powder of this invention, Ni element can achieve high polishing and corrosion resistance, and improve mechanical strength; C element can ensure sufficient strength of the 3D printed layer, while giving the alloy good toughness and weldability; B element can lower the melting point of the alloy material, increase the fluidity of the alloy material, and at the same time, B element has a greater affinity for oxygen than the metal component, and when it melts, it reacts with oxygen to form boron oxide, which floats on the surface of the 3D printed layer after melting, and forms a non-porous 3D printed layer after cooling, thereby achieving the effect of dense, crack-free, and pore-free 3D printed layer; Si element can enhance the tensile strength, elasticity, acid resistance, heat resistance, and corrosion resistance of the 3D printed layer, and can increase the resistivity of the 3D printed layer. Through the interaction, cooperation, and mutual influence of the eleven elements, the components synergistically enhance each other, making the wear-resistant and high-temperature alloy powder have high temperature resistance and high wear resistance. Its printed layer is firmly bonded to the H13 matrix, with a dense structure and is not easy to crack, and can be widely promoted as a wear-resistant and high-temperature 3D printing material.

[0032] This invention also specifies in detail the processing technology of the high-temperature and wear-resistant rotary forging roll. To ensure the quality of the 3D printed layer under high-speed laser, this invention selects a fiber laser. Based on the defocusing amount of the fiber laser, the focal length of the focusing lens is selected, and the process parameters of the laser are determined according to the matching relationship between the laser scanning speed, laser beam size, and laser power. This allows for the instantaneous formation of a molten pool, generating a small heat-affected zone, resulting in only minor deformation of the substrate. This leads to the formation of a 3D printed layer with extremely high density, higher wear resistance, extremely low dilution rate, good surface modification properties, and high printing efficiency. This significantly improves the wear resistance of the rotary forging roll and maintains high wear resistance even at temperatures up to 500℃. By limiting the printing parameters, the rotary forging roll substrate is ensured to remain undamaged during the printing process, and the printed layer exhibits high density, good surface smoothness, and high printing efficiency. Attached Figure Description

[0033] Figure 1 The image shows the morphology of wear-resistant and high-temperature-resistant alloy powder under an electron microscope.

[0034] Figure 2 Particle size distribution of wear-resistant and high-temperature-resistant alloy powder as detected by a laser particle size analyzer;

[0035] Figure 3 Metallographic image of the cross-section of the 3D-printed high-temperature wear-resistant layer;

[0036] Figure 4 SEM image of the 3D printed layer;

[0037] Figure 5 The Vickers hardness curve of the 3D printed layer along the thickness direction;

[0038] Figure 6The curves showing the change in the friction coefficient of the 3D printed layer and the H13 matrix over time;

[0039] Figure 7-1 The cross-sectional morphology of the wear marks on the 3D printed layer;

[0040] Figure 7-2 The cross-sectional morphology of the wear marks on the H13 matrix;

[0041] Figure 8 Bar chart of wear marks volume for 3D printed layer and H13 substrate;

[0042] Figure 9 The curves show the variation of the friction coefficient at different temperatures.

[0043] Figure 10 To scan the single-channel morphology after melting;

[0044] Figure 11 The relationship between different scanning speeds and scan linewidths;

[0045] Figure 12 A graph showing the effect of scanning speed on the single-track, single-layer scan line height.

[0046] Figure 13 The overlapping states under different scanning intervals;

[0047] Figure 14 The surface morphology of a single layer when the overlap rate is 40%;

[0048] Figure 15 The effect of scanning speed on density;

[0049] Figure 16 The effect of scanning spacing on density. Detailed Implementation

[0050] A high-temperature and wear-resistant rotary forging roll includes a base and a high-temperature and wear-resistant layer covering the outside of the base; the base is an H13 die steel base, and the high-temperature and wear-resistant layer is obtained by laser 3D printing and cladding wear-resistant and high-temperature alloy powder onto the surface of the base.

[0051] The thickness of the high-temperature wear-resistant layer is 0.5mm to 2.5mm, preferably 1.0mm to 2.0mm. The specific thickness can be adjusted according to the actual or designed stress conditions of the rotary forging roll.

[0052] A method for processing a high-temperature and wear-resistant rotary forging roll includes the following steps:

[0053] S1. Substrate surface pretreatment

[0054] The substrate surface is polished and cleaned to remove the oxide layer, oil stains and other contaminants, providing a good working surface for the subsequent laser 3D printing process;

[0055] Specifically, the surface of the rotary forging roll substrate is first polished using a polishing device. Once the oxide layer on the surface of the rotary forging roll substrate is polished clean and the substrate surface is smooth and glossy, a cleaning agent is then used to clean the surface of the rotary forging roll substrate to remove oil stains and other contaminants.

[0056] Polishing the surface of the rotary forging roll substrate not only increases the laser absorption rate but also improves the adhesion between the substrate and the printed layer. The polishing equipment is sandpaper or a polishing machine, with the sandpaper used being 80-120 grit. The surface roughness Ra of the polished rotary forging roll substrate is ≤12.5. Surface roughness refers to the unevenness of the processed surface, characterized by small spacing and minute peaks and valleys. Its evaluation parameters include height characteristic parameters, spacing characteristic parameters, and shape characteristic parameters. This invention uses the height characteristic parameter, represented by Ra. The surface of the rotary forging roll substrate cannot be completely smooth; a certain degree of roughness is required to ensure the stability of the metallurgical bond between the printed layer and the substrate.

[0057] The cleaning agent is acetone, which has excellent dissolving properties for oil and other impurities. The cleaning method involves rinsing the polished surface of the rotary forging roll substrate with acetone; alternatively, acetone can be absorbed into the fabric and used to wipe the substrate surface. The rinsing or wiping can be done once, or twice or more, until the oil stains on the substrate surface are completely removed.

[0058] Preferably, after the iron oxide scale on the substrate surface is removed by grinding, the subsequent cleaning and printing steps are performed in an inert gas atmosphere, such as a nitrogen atmosphere. This prevents the substrate surface from re-exposing to air and causing oxidation, reduces the formation of iron oxide scale, enhances the metallurgical bonding strength between the substrate and the printed layer, and prevents cracking.

[0059] S2, Laser 3D Printed High-Temperature Wear-Resistant Layer

[0060] Using wear-resistant and high-temperature resistant alloy powder as the printing material, laser metal 3D printing technology is used to perform layer-by-layer laser 3D printing on the pretreated substrate surface until the printed layer thickness reaches the design thickness.

[0061] Specifically, a coaxial laser powder feeder is used to deliver wear-resistant and high-temperature resistant alloy powder with a particle size of 200-325 mesh to the surface of the rotary forging roll substrate. At the same time, a fiber laser is used for layer-by-layer laser 3D printing. The laser process parameters are controlled as follows: focal length f = 250mm-300mm, printing power P = 8000W, spot diameter D = 0.3mm-1.2mm, printing scanning speed V = 400mm / s-600mm / s, and overlap rate θ = 40%.

[0062] The printing scanning rate refers to the relative moving speed between the laser printhead and the copper plate, and the printing scanning rate is matched with the feeding speed of the laser coaxial toner feeder.

[0063] The overlap rate θ refers to the different overlap states that occur between individual traverses due to different scanning intervals. In multi-traverse forming, to ensure the reliability of the connection and fusion between multiple individual traverses and the flatness of the formed layer after overlap, a suitable scanning interval needs to be selected. If the scanning interval is too large, i.e., the overlap is insufficient, valleys will appear between individual traverses, resulting in an uneven surface of the formed layer, affecting the quality of subsequent formed layers. This adverse effect accumulates layer by layer and may even lead to the termination of the forming process. In an ideal overlap state, the individual traverses are uniformly fused, and the surface of the formed layer is smooth and flat. If the scanning interval is too small, i.e., the overlap is too large, there is excessive repetition and accumulation between individual traverses in some areas, affecting the surface quality of the formed layer and the height of the current formed layer, thus affecting the accuracy and performance of the formed part. This invention specifically limits the overlap rate θ to 40%, at which point the fusion between individual traverses is most uniform, the printed layer surface is smooth, and no further polishing is required after printing.

[0064] Based on the characteristics of the H13 rotary forging roll substrate surface and the properties of the wear-resistant and high-temperature alloy powder of this invention, the inventors selected a fiber laser with specific parameters for layer-by-layer laser 3D printing. By determining the defocusing amount of the fiber laser, the focal length of the focusing lens was selected, and the process parameters of the laser were determined according to the matching relationship between the laser scanning speed, laser beam size, and laser power. This allows for the instantaneous formation of a molten pool, generating a small heat-affected zone, resulting in only minor deformation of the rotary forging roll substrate surface, and forming a 3D printed layer with extremely high density, higher wear resistance, extremely low dilution rate, and high printing efficiency.

[0065] The high-temperature wear resistance of the rotary forging roll is closely related to the performance of the 3D printing material itself. The specific composition of the wear-resistant and high-temperature alloy powder used in this invention includes the following components by weight percentage: Ni: 20.0%–30.0%; C: 5.0%–12.0%; Cr: 6.0%–10.0%; Co: 12.0%–16.0%; B: 2.0%–5.0%; Si: 2.0%–6.0%; P: 2.0%–3.0%; W: 8.0%–12.0%; Be: 3.0%–5.0%; Mn: 1.0%–2.0%; the balance is Fe, and the Fe content is not less than 7.0%.

[0066] The preferred composition comprises, by weight percentage: Ni: 25.0%–29.0%; C: 6.0%–10.0%; Cr: 8.0%–9.5%; Co: 13.0%–16.0%; B: 2.5%–4.5%; Si: 3.0%–5.0%; P: 2.3%–2.8%; W: 8.0%–10.0%; Be: 3.5%–4.5%; Mn: 1.0%–1.6%; with the balance being Fe.

[0067] The wear-resistant and high-temperature resistant alloy material possesses high strength and excellent temperature resistance. It is not prone to softening, deformation, or wear at high temperatures, and its operating temperature is significantly increased, allowing it to be used in environments up to 1000℃. Its tensile strength at 500℃ can remain above 1300MPa. In the wear-resistant and high-temperature resistant alloy powder, each component interacts and influences the others; none can be omitted, collectively forming the comprehensive properties of the alloy material.

[0068] Specifically, the roles of each component in the wear-resistant and high-temperature alloy powder are as follows:

[0069] Ni: Nickel is a hard, ductile, and ferromagnetic metallic element. It is highly polishable and corrosion-resistant. Adding nickel to an alloy can improve its mechanical strength. Adding 25% to 29% nickel to an alloy increases its tensile strength by 2 to 3 times.

[0070] C: Carbon has a significant impact on the microstructure and properties of alloys. As the carbon content increases, the initial melting temperature of the alloy gradually decreases; the content of primary carbides gradually increases; extensive experiments have shown that a carbon content of 6%–10% reduces the high-cycle fatigue life and creep life of the alloy, and has a certain impact on tensile properties. At the same time, carbon is the main element for improving the strength of alloys; a carbon content of 6%–10% can ensure sufficient strength while also giving the alloy good toughness and weldability.

[0071] Cr: Chromium can significantly improve strength, hardness and wear resistance, but at the same time reduce plasticity and toughness; chromium can also improve the oxidation resistance and corrosion resistance of alloy materials. In alloy materials, chromium is mainly used to improve hardenability and can form chromium-containing carbides on the carburized surface to improve its wear resistance.

[0072] Co: Co has a melting point of 1493℃ and a specific gravity of 8.9. It is relatively hard and brittle, and its hardness, tensile strength, machinability, thermodynamic properties, and electrochemical behavior are similar to those of iron and nickel. The presence of a certain amount of cobalt in the alloy can significantly improve its resistance to high-temperature corrosion, wear resistance, and machinability.

[0073] B: Adding more than 1.5% boron to alloy powder forms a superalloy. 2.5% to 4.5% boron is the optimal economic content. Adding boron lowers the melting point and increases fluidity. Furthermore, boron has a stronger affinity for oxygen than the metal component, reacting with oxygen upon melting to form boron oxide. This oxide floats on the surface of the 3D printed layer and, upon cooling, forms a non-porous 3D printed layer. The metal component then forms a metallurgical bonding layer with the substrate surface.

[0074] When the corrosion potential is high, alloys relying on chromium for protection will enter a hyperpassivated state. At this point, the chromium-rich passivation film becomes unsustainable. Silicon provides greater protection under these conditions, promoting the production of a more stable silicon oxide-mimicking passivation film. Adding 3.0%–5.0% silicon to an alloy enhances its tensile strength, elasticity, acid resistance, heat resistance, and corrosion resistance. It also increases the alloy's resistivity and acts as an effective deoxidizer.

[0075] P: Phosphorus is used to distort the matrix lattice and achieve solid solution strengthening, giving full play to the high-strength alloying ability of nickel, chromium and other alloys.

[0076] W: Tungsten element is used to obtain high-hardness carbides to form a dispersed reinforcing phase, which further improves the wear resistance of the 3D printed layer.

[0077] Be: As a strong solvent element, Be can effectively inhibit grain boundary dissolution and precipitation, forming stable compounds and improving the mechanical properties of the alloy. Furthermore, Be can refine the alloy grains and increase the number of grain boundaries, thereby improving the alloy's strength and hardness.

[0078] Mn: In the alloying process of nickel-based alloys, manganese can interact with other elements to increase the alloy's creep resistance and oxidation resistance. Especially at high temperatures, the addition of manganese can effectively inhibit grain growth, maintain a fine grain structure, and thus improve the alloy's strength and plasticity.

[0079] Fe: Improves resistance to high-temperature carburizing environments, reduces alloy costs, controls thermal expansion, and enhances the alloy's processing and mechanical properties.

[0080] In summary, this invention combines the aforementioned eleven raw material components. Through the mutual assistance and coordination of these components, not only are their individual functions fully utilized, but a synergistic effect is also achieved. During the 3D printing process, elements such as C and Fe in the alloy powder form carbide precipitates. These carbides are dispersed throughout the sample, but as the operating temperature increases, the carbide grains grow rapidly, causing the strength of the part to decrease in a short time. Co can stabilize the strengthening phase, promote the precipitation of strengthening phases such as Ni and Fe, and inhibit the transformation of martensite to austenite, thereby improving the stability of the material at high temperatures. P is used to distort the matrix lattice and achieve solid solution strengthening, fully utilizing the high-strength alloying energy of Ni, Cr, and other alloys. Combined with other elements such as B and Si, the printed layer has a tensile strength exceeding 1300 MPa at 500°C.

[0081] The wear-resistant and high-temperature resistant alloy powder is regularly spherical, with high sphericity, uniform particle size, and good flowability, resulting in better processing efficiency and finished product performance. The morphology of the alloy powder under an electron microscope is as follows: Figure 1 As shown, its sphericity is very high; the particle size of the wear-resistant and high-temperature alloy powder was detected using a laser particle size analyzer, and the particle size distribution diagram is shown below. Figure 2 As shown. (The sentence is incomplete and requires more context to translate accurately.) Figure 2 It is known that spherical powder with a particle size of 45μm-120μm accounts for no less than 90% of the wear-resistant and high-temperature alloy powder. The alloy powder with high particle size uniformity ensures the high density of the printed layer, making the working wear resistance of the rotary forging roller higher.

[0082] S3, Cooling

[0083] After the printed rotary forging roll is cooled down until it is completely cooled, a high-temperature wear-resistant rotary forging roll with straight boundaries, uniform thickness, and dense structure can be obtained.

[0084] The 3D printed layer obtained by 3D printing on the surface of H13 substrate using this invention has a dense structure, is free of cracks and pores, and forms a good metallurgical bond with the substrate surface. In addition, the 3D printed layer obtained by 3D printing on the surface of H13 substrate using this invention improves the hardness and wear resistance of the substrate, enhances the local resistance of the substrate to the intrusion of external objects, and extends the service life of the substrate product.

[0085] The high-temperature wear resistance of the rotary forging roll is closely related to the laser metal 3D printing process. Therefore, the inventors conducted a detailed analysis and research on the impact of 3D printing process parameters on product performance. Specifically, firstly, the influence of laser power and scanning speed on single-pass single-layer processes was studied. From the microscopic perspective of single-pass single-layer forming, the influence of laser power and scanning speed on the surface morphology and line width and height of single-pass single-layer forming was studied through the surface quality of a single curing line and the scanning linewidth and height. This provides a theoretical basis for subsequent multi-pass single-layer and multi-pass multi-layer processes. Secondly, based on the single-pass process, the influence of scanning spacing on the surface quality of the single-layer forming surface was studied. The reasonable selection and setting of the scanning spacing directly affects the accuracy of the single-layer forming surface. Single-layer forming not only relates to the effect of the solid formed part, but also directly determines the accuracy and performance of the formed part, and is the key to affecting the forming process.

[0086] The analysis process will be described in detail below.

[0087] 1. Data Measurement

[0088] According to the test requirements, several samples were cut from the molded substrate using a wire EDM machine.

[0089] Surface quality observation: The cut sample is cleaned with acetone and alcohol to remove oil stains left on the sample surface during wire cutting. Then, the sample is placed in an ultrasonic cleaner to remove impurities. Finally, the surface morphology is observed. When observing the scanning linewidth and cross-sectional morphology, grinding and polishing are required first, followed by cleaning with acetone, alcohol, and ultrasound, before observation under an optical microscope.

[0090] 1.1 Research on Single-pass Single-layer Forming Process

[0091] 1.1.1 Effects of laser power and scanning speed on single-pass surface morphology

[0092] This part of the experiment studies single-pass, single-layer forming, analyzing the influence of different scanning speeds on the surface morphology, linewidth, and lineheight of the single-pass scanning line, thereby determining a more ideal range of process parameters. In the single-pass, single-layer experiment, the thickness of the central powder feed layer needs to be considered. During the forming process, a thicker powder feed layer will affect the accuracy of the formed part; therefore, the powder feed layer thickness should be as small as possible. Considering the particle size of the experimental material used is 45–75 μm, the powder feed layer thickness was set to 0.15 mm. In the experiment, the laser power was 8000 W, and the scanning speed started at 100 mm / s and increased at 100 mm / s intervals to 500 mm / s. The morphology of the single pass after scanning and melting was observed under different parameter combinations.

[0093] Single-track scanning lines after single-layer sintering, when magnified under an optical microscope, revealed three main morphologies: Figure 10 As shown.

[0094] During the forming process, after the powder melts on the matrix surface, it forms independent small droplets under the action of liquid surface tension, and after solidification, it forms this single-channel morphology. Figure 10 The single-channel width shown is approximately 0.3 mm, about twice the focusing diameter of the laser spot. Furthermore, the single channel is continuous, has a uniform width, and a smooth surface, representing an ideal situation. Selecting such single-channel parameters as the basis for the next experimental step is a suitable choice.

[0095] Therefore, the laser power of the 3D printing process of this invention is determined to be 8000W and the scanning speed is 500mm / s.

[0096] 1.1.2 The Influence of Scanning Speed ​​on Scan Linewidth and Line Height

[0097] The linewidth of a single scan determines the minimum feature size that can be formed, and is mainly affected by the width of the laser molten pool. Figure 11 The display shows the relationship between different scanning speeds (horizontal axis, unit: mm / s) and scanning line width (vertical axis, unit: mm). It can be observed that as the scanning speed increases, the line width gradually decreases.

[0098] The single-pass, single-layer scanning line height is a very important evaluation parameter for selective laser 3D printing. On the one hand, the size of the scanning line height directly affects the forming efficiency. If the single-pass, single-layer scanning line height is large, the forming time for a certain height of part will be relatively small, and the forming efficiency will be high.

[0099] Figure 12 This is a graph showing the effect of scanning speed on the single-track, single-layer scanning line height. With a laser power of 8000W and a powder layer thickness of 0.15mm, the relationship between scanning speed and scanning line height was observed as the scanning speed increased from 100mm / s to 500mm / s. It can be seen that as the scanning speed increases, the single-track scanning line height gradually decreases.

[0100] 1.2 Research on Multi-pass Single-layer Forming Process

[0101] 1.2.1 Multi-stage melting and forming principle

[0102] Multi-pass melting forming is essentially formed by melting multiple single-pass scanning with a certain scanning interval. The distance between any two adjacent single-pass scanning is called the scanning interval. In order to ensure the reliability of the connection and fusion between multiple single passes and the flatness of the formed layer after overlapping, it is necessary to select an appropriate scanning interval for overlapping during multi-pass forming.

[0103] Figure 13 The overlap status under different scanning intervals is shown, which can be seen intuitively. Figure 13 (a) When the scanning interval is too large and the overlap is insufficient, a valley phenomenon will appear between single passes, resulting in an uneven surface of the forming layer, which affects the quality of subsequent forming layers. This should not affect the cumulative layer process and may even lead to the termination of the forming process. Figure 13 (b) For an ideal overlap state, the individual layers are evenly fused together, resulting in a smooth and flat surface of the formed layer: Figure 13 (c) When the scanning spacing is too small and the overlap is too large, there is excessive repetition and accumulation between single passes in some areas, which affects the surface quality of the forming layer and the height of the current forming layer, thus affecting the accuracy and performance of the formed part.

[0104] 1.2.2 Effect of overlap rate on sample surface morphology

[0105] During single-pass forming experiments, we observed variations in linewidth across different process parameters R. To better investigate the optimal overlap state under various process parameters, we used overlap rate as an influencing factor in our experiments. The relationship between overlap rate θ and scanning spacing S is shown in the table below.

[0106] Scanning distance (μm) 0.5 0.47 0.33 0.26 0.17 Overlap rate θ 10％ 20％ 30％ 40％ 50％

[0107] The experimental process parameters were: laser power 8000W, scanning speed 500mm / s, powder layer thickness 0.15mm, single-pass forming height 0.13mm, and single-pass forming width 1.2mm.

[0108] Using the above process parameters, five sets of multi-pass single-layer melting and forming experiments were conducted with overlap rates of 10%, 20%, 30%, 40%, and 50%. Under different overlap rates, using different scanning intervals will produce different surface qualities and appearances, resulting in five different types of single-layer surface morphologies.

[0109] pass Figure 14 As can be seen, the single-layer surface clearly shows single-stripe patterns in the same direction as the scanning, and these single stripes are all continuous and smooth. The overlap rate in this state is 40%. This is because adjacent single stripes overlap during the tracing process, forming certain valleys at the overlap points. For example... Figure 14 The single-layer surface shown has no spheroidization, uniform thickness, and tight connection with the substrate. It can be evenly spread with powder during the fabrication of the next layer, which is the most suitable overlap rate.

[0110] 2. Study on density and mechanical properties of laser selective 3D printing

[0111] Density is a crucial indicator for evaluating the performance of laser selective 3D printing. High density leads to better mechanical properties; however, phenomena such as spheroidization, warping, and powder adhesion that easily occur during forming experiments can prevent the required density from being achieved. Therefore, improving density remains the foundation and prerequisite for achieving precise manufacturing through laser selective 3D printing.

[0112] 2.1 Density Study

[0113] 2.1.1 Methods for measuring density

[0114] This experiment will determine the density of samples under different parameters and compare it with the density of a 100% dense standard beryllium-quenched H13 forging sample to obtain the relative density as a standard for measuring density. The standard for density measurement is GB / T 3850-1983, "Method for Determination of Density of Dense Sintered Metallic Materials and Hard Alloys". The basic method for measuring density is the water displacement method.

[0115] In the density measurement experiment, the selected CAD model of the molded sample was 20mm long, 20mm wide, and 5mm high. After the molded sample was formed on the substrate, the sample and the substrate were removed together, and the molded sample was cut off from the substrate using wire cutting. Then, the density was measured using the water displacement method. Three samples were formed for each set of parameters, and the density of each sample was measured and the average value was calculated.

[0116] 2.1.2 Influence of process parameters on density

[0117] 2.1.2.1 Effect of scanning speed on density

[0118] When studying the effect of scanning speed V on density, the laser power P, powder layer thickness h, scanning spacing S, and scanning method remained unchanged. The specific process parameters and results are shown in the table below.

[0119]

[0120] Using the scanning speed V as the x-axis and the sample density as the y-axis, we can obtain the following: Figure 15 The line graph shown illustrates that as the scanning speed increases, the density gradually decreases.

[0121] 2.1.2.2 Effect of scanning interval on packing density

[0122] When studying the effect of scanning spacing S on density, the laser power P, powder layer thickness h, scanning speed V, and scanning method remained constant. The specific process parameters are shown in the table below:

[0123]

[0124]

[0125] Using the scanning interval S as the abscissa and the sample density as the ordinate, we can obtain the following: Figure 16 The line graph shown illustrates this. As the scanning spacing increases, the density gradually decreases. When the scanning spacing is less than 0.25 mm, the density change is minimal; however, when the scanning spacing exceeds 0.25 mm, the density decreases significantly.

[0126] 2.2 Mechanical Property Study

[0127] 2.2.1 Tensile property study

[0128] Mechanical properties are an important indicator for evaluating the quality of parts and the suitability of the manufacturing process. Therefore, parts manufactured using different processes are usually characterized by their mechanical properties. Laser selective 3D printing technology, due to its unique additive manufacturing characteristics, has significant advantages over traditional processing techniques (such as casting and forging) in terms of part structure and forming efficiency. However, mechanical properties are the decisive factor for the widespread application of the formed parts, and some studies suggest that process parameters have a direct impact on the mechanical properties of the formed parts.

[0129] 2.2.1.1 Sample Preparation

[0130] Considering that the surface quality of the formed part will affect the results of the tensile test, when making tensile specimens, first make a rectangular strip that is slightly larger than the standard specimen size, and then cut it to the standard test size using wire cutting.

[0131] 2.2.1.2 Tensile property test

[0132] After the tensile specimens were prepared, they were tested using a tensile testing machine at room temperature. The displacement rate was controlled within the range of 0.001-1000 mm / min. Three sets of process parameters were selected for the forming of the tensile specimens. The parameters used in the experiment and the corresponding tensile strength results are shown in the table. The entire forming process was carried out in a protective gas of high-purity chlorine to ensure that the chlorine content in the forming cavity was below 100 ppm to prevent oxidation of the formed specimens at high temperatures during the forming process.

[0133]

[0134] As shown in the table, the maximum tensile strength under the three sets of parameters is 1296.50 MPa, and the average tensile strength is 1257.81 MPa, which is slightly greater than the tensile strength of forgings under the same conditions. The tensile strength of H13 material is more than 1.5 times that of alloy steel, generally around 1200 MPa.

[0135] The present invention will be further illustrated by the following examples.

[0136] Example 1

[0137] A high-temperature and wear-resistant rotary forging roll includes a substrate and a high-temperature wear-resistant layer covering the outside of the substrate. The substrate is an H13 die steel substrate, and the high-temperature wear-resistant layer is obtained by laser 3D printing and cladding wear-resistant and high-temperature alloy powder onto the surface of the substrate. The thickness of the high-temperature wear-resistant layer is 1.0 mm.

[0138] The processing method of the high-temperature and wear-resistant rotary forging roll includes the following steps:

[0139] S1. Surface pretreatment of rotary forging rolls

[0140] Grind and clean the surface of the rotary forging roll to remove the oxide layer, oil stains and other contaminants from the surface of the rotary forging roll substrate;

[0141] S2, Laser 3D Printed High-Temperature Wear-Resistant Layer

[0142] Using wear-resistant and high-temperature resistant alloy powder as raw material, a laser coaxial powder feeder is used to feed the wear-resistant and high-temperature resistant alloy powder into the surface of the rotary forging roll sample substrate. At the same time, a fiber laser is used to perform layer-by-layer laser 3D printing until the thickness of the printed layer reaches 1.0 mm.

[0143] The laser process parameters are controlled as follows: focal length f = 250mm~300mm, printing power P = 8000W, spot diameter D = 0.3mm~1.2mm, printing scanning speed V = 400mm / s~600mm / s, and overlap rate θ = 40%.

[0144] The wear-resistant and high-temperature resistant alloy powder specifically comprises: Ni: 25%, C: 6%, Cr: 8%–9.5%, Co: 13%, B: 2.5%, Si: 3.0%, P: 2.3%, W: 8.0%, Be: 3.5%, Fe: 4%, Mn: 1.0%.

[0145] S3, Cooling

[0146] After the printed rotary forging roll is cooled down until it is completely cooled, a 3D printed wear-resistant layer with straight boundaries and uniform thickness can be obtained, resulting in a rotary forging roll with a dense and uniform surface that is resistant to high temperature and wear.

[0147] The performance of the rotary forging roll prepared in Example 1 was tested.

[0148] 1. Phase analysis

[0149] Multiple test blocks of uniform length, width, height, and volume were randomly selected from the prepared samples. The laser 3D printing layers of each test block were analyzed using a DX-2700X camera diffractometer, yielding the following results: Figure 3Metallographic image of the cross-section of the 3D printed layer shown.

[0150] Depend on Figure 3 As can be seen, the upper part is the 3D printed layer, and the lower part is the rotary forging roll substrate, with a clear interface between the 3D printed layer and the rotary forging roll substrate. At the interface, the substrate and the 3D printed layer are metallurgically bonded. The thickness of the 3D printed layer is approximately 1.0 mm, and there are no pores or cracks within the 3D printed layer, indicating good internal quality.

[0151] Figure 4 The image shows a SEM image of the 3D printed layer, illustrating the bonding between the 3D printed layer and the rotary forging roll substrate. The vertical lines indicate the position and direction of the line scan. As can be seen from the image, all elements are uniformly distributed throughout the 3D printed layer.

[0152] 2. Hardness Analysis

[0153] The Vickers hardness of the 3D-printed layer of the sample was measured using an HVS-1000 digital microhardness tester. A load of 200g was applied for 10 seconds, and the average value was taken after five measurements. Measurements were taken vertically downwards from the surface of the laser-printed layer at intervals of 0.1mm. Three points were measured laterally at the same vertical distance, with an interval of 0.2mm between each point. The average value of the three points was then taken as the Vickers hardness value for that vertical distance. Based on this, the following... Figure 5 The Vickers hardness curve of the 3D printed layer of the sample along the thickness direction is shown.

[0154] Depend on Figure 5 As can be seen from the microhardness curve, the highest hardness appears in the subsurface layer, with a maximum hardness of 705 HV. The average hardness of the 3D printed layer is 675 HV, while the hardness of the rotary forging roll substrate is only 470 HV.

[0155] Compared to the rotary forging roll substrate, the hardness of the 3D printed layer is nearly twice that of the substrate, which means that the 3D printed layer obtained by this invention has stronger local resistance to intrusion from external objects. In the actual 3D printing process, considering the adhesion of the 3D printed layer to the surface of the rotary forging roll substrate, the thickness of the 3D printed layer should not be less than 0.5 mm; and considering cost, the thickness of the 3D printed layer should not exceed 2.5 mm.

[0156] 3. Abrasion resistance analysis

[0157] Several samples were randomly selected from the prepared samples as specimens with 3D printing layers, and several rotary forging roll substrates without 3D printing layers were selected as control specimens. Experiments and comparisons were conducted on the friction coefficient and wear amount.

[0158] 3.1 Comparison of Friction Coefficients

[0159] The 3D printed layer and the rotary forging roll substrate were experimentally tested using a friction coefficient meter.

[0160]

[0161] Figure 6 The curves show the friction coefficients of the 3D printed layer and the rotary forging roll substrate as a function of time. The curves show that the maximum friction coefficient of the rotary forging roll substrate is 0.8027, and the average friction coefficient is 0.614. Over time, the friction coefficient of the rotary forging roll substrate exhibits a trend of first decreasing and then increasing. The maximum friction coefficient of the 3D printed layer is 0.496, and the average friction coefficient is 0.45. Over time, the friction coefficient generally maintains a trend of increasing from a low value.

[0162] Throughout the entire friction process, the friction coefficient of the printed layer is significantly lower than that of the rotary forging roll substrate, indicating a smaller friction coefficient. Furthermore, over time, the change in the friction coefficient of the printed layer is significantly smaller than that of the rotary forging roll substrate, resulting in more stable operation and less susceptibility to wear.

[0163] 3.2 Comparison of Wear Amount

[0164] The surface wear resistance of specimens with and without 3D printed layers was tested using an MFT-R4000 high-speed reciprocating friction and wear testing machine. After the test, the specimens were cleaned with acetone and dried before the friction amount was tested.

[0165] Friction and wear were measured using a NanoMap 500LS scanning 3D surface profilometer. The principle is to scan the cross-section of the wear track on the sample using a scanning probe, and then analyze the data using SPIP 5.13 software. Each sample was scanned five times to determine the average cross-sectional area of ​​the wear track, which was then multiplied by the wear track length to obtain the wear track volume. Figure 7-1 , Figure 7-2 The cross-sectional morphology of the wear marks on the 3D printed layer and the rotary forging roll substrate are shown respectively. Figure 8 The figure shows a bar chart of the wear marks volume of the 3D printed layer and the rotary forging roll substrate.

[0166] Depend on Figure 7-1 , Figure 7-2 It can be seen that the wear mark depth of the rotary forging roll substrate sample is approximately 55 μm, and the width is approximately 1200 μm; while the wear mark depth of the 3D printed layer is approximately 19.5 μm, and the width is approximately 1200 μm. Under the same test conditions, the wear mark and wear width of the 3D printed layer are smaller than those of the rotary forging roll substrate.

[0167] Depend on Figure 8It can be seen that the wear mark volume of the 3D printed layer is significantly smaller than that of the rotary forging roll substrate, which means that the 3D printed layer is beneficial to improving the wear resistance of the product and extending its life.

[0168] Based on a comprehensive analysis of the friction coefficient and wear amount, it can be seen that the wear resistance of the 3D printed layer is significantly better than that of the rotary forging roll substrate.

[0169] 4. Analysis of resistance to high-temperature corrosion

[0170] Multiple samples were randomly selected from the prepared samples as specimens with 3D printing layers, and multiple rotary forging roll substrates without 3D printing layers were selected as control specimens. The friction coefficient of the specimens at different temperatures was tested, and curves were established based on the test values. Figure 9 The curves show the variation of the friction coefficient at different temperatures for a 3D printed layer sample and a rotary forging roller substrate, under the same friction conditions.

[0171] As shown in the figure, ① numerically, the friction coefficient of the 3D printed layer is always less than that of the rotary forging roll substrate, and the difference is large; ② in terms of trend, as the test temperature increases, the friction coefficient of the rotary forging roll substrate first increases and then decreases, and the fluctuation range is large; the friction coefficient of the 3D printed layer shows a gradual decreasing trend, but the fluctuation range is small.

[0172] In summary, the friction coefficient of the 3D printed layer is not significantly affected by temperature changes, and its high-temperature resistance is far superior to that of the rotary forging roll substrate.

[0173] Through a comprehensive comparison of the above four properties, the 3D printed layer obtained by this invention on the surface of the rotary forging roll substrate has a dense structure, is free of cracks and pores, and forms a good metallurgical bond with the surface of the rotary forging roll substrate. Furthermore, using the 3D printed layer obtained by this invention on the surface of the rotary forging roll substrate improves the hardness and wear resistance of the rotary forging roll substrate, enhances its local resistance to intrusion by external objects, and extends the service life of the rotary forging roll substrate product.

[0174] Examples 2 to 4

[0175] Examples 2 through 4 are processed in basically the same way as Example 1, the difference being that the specific composition of the wear-resistant and high-temperature alloy powders used in the four examples differs. The specific compositions of the three types of wear-resistant and high-temperature alloy powders are shown in the table below.

[0176]

[0177] Comparative Example 1

[0178] The processing method of Comparative Example 1 is basically the same as that of Example 1. The difference is that the specific composition content of the wear-resistant and high-temperature alloy powder used is different. Specifically, the wear-resistant and high-temperature alloy powder of Comparative Example 1 does not contain the three elements B, Co and P, as shown in the table above.

[0179] Comparative Example 2

[0180] The processing method of Comparative Example 2 is basically the same as that of Example 1. The difference is that the specific composition content of the wear-resistant and high-temperature alloy powder used is different. Specifically, the wear-resistant and high-temperature alloy powder of Comparative Example 2 does not contain the elements B and P, as shown in the table above.

[0181] Comparative Example 3

[0182] Comparative Example 3 uses an H13 rotary forging roll to compare the performance of the rotary forging roll before and after 3D printing.

[0183] The forging roll samples processed in Examples 1-4 and Comparative Examples 1-3 were used to test their mechanical properties at three temperature conditions: room temperature, 300℃, and 500℃. The testing equipment included a digital microhardness tester, a friction and wear testing machine, and a tensile testing machine. The test results are shown in the table below:

[0184]

[0185]

[0186] The comparative data above show that, under the combined effect of elements such as C, P, Co, and B, the samples in Examples 1 to 4 all exhibit high hardness, tensile strength, and good wear resistance. They are not prone to cracking or deformation under high-temperature conditions, and have a long service life, meeting the requirements for wear-resistant and high-temperature operation. Compared with the H13 matrix of Comparative Example 3, the wear resistance is significantly improved under room temperature, 300℃, and 500℃ conditions.

[0187] The alloy materials used in Comparative Examples 1 and 2 differ from those in Examples 1 to 4. Specifically, the alloy powder in Comparative Example 1 does not contain B, Co, or P, while the alloy powder in Comparative Example 2 does not contain B or P. Test data shows that Comparative Examples 1 and 2 are significantly inferior to the products of Examples 1 to 4 in terms of hardness, coefficient of friction, and tensile strength, demonstrating the significant superiority of the wear-resistant and high-temperature-resistant alloy powder used in this invention. Furthermore, the comparison between Comparative Examples 1 and 2 shows that although Comparative Example 2 added Co, which has resistance to high-temperature corrosion and wear resistance, it lacks the synergistic effect of other elements, resulting in significantly lower high-temperature wear resistance compared to the products of Examples 1 to 4. This demonstrates that the interaction between the elements in the wear-resistant and high-temperature-resistant alloy powder has a significant impact on the performance of the final printed layer and the bonding degree between the printed layer and the substrate.

[0188] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A high-temperature resistant and wear-resistant rotary forging roll, characterized in that: The rotary forging roll includes a base and a high-temperature wear-resistant layer covering the outside of the base; the base is an H13 mold steel base, and the high-temperature wear-resistant layer is obtained by laser 3D printing and cladding wear-resistant and high-temperature resistant alloy powder onto the surface of the base; The processing method of the high-temperature and wear-resistant rotary forging roll includes the following steps: S1. Substrate surface pretreatment Grind and clean the substrate surface to remove the oxide layer, oil stains and other contaminants. S2, Laser 3D Printed High-Temperature Wear-Resistant Layer Using wear-resistant and high-temperature resistant alloy powder as the printing material, laser metal 3D printing technology is used to perform layer-by-layer laser 3D printing on the pre-treated substrate surface until the printing layer thickness reaches the design thickness. S3, Cooling Cool the printed rotary forging roll until it is completely cooled to produce a high-temperature and wear-resistant rotary forging roll. The specific process of step S1 is as follows: First, the surface of the rotary forging roll substrate is polished using a polishing device. When the oxide layer on the surface of the rotary forging roll substrate is polished clean and the substrate surface is smooth and shiny, the surface of the rotary forging roll substrate is cleaned with a decontaminant to remove oil stains and other contaminants. After the iron oxide scale on the substrate surface is removed by polishing, the subsequent cleaning and printing steps are carried out in an inert gas atmosphere. The polishing equipment is sandpaper or a polishing machine, the sandpaper is 80-120 grit, and the surface roughness Ra of the polished rotary forging roll substrate is ≤12.5; the cleaning agent is acetone. In step S2, the specific composition of the wear-resistant and high-temperature resistant alloy powder includes the following components by weight percentage: Ni: 20.0%~30.0%; C: 5.0%~12.0%; Cr: 6.0%~10.0%; Co: 12.0%~16.0%; B：2.0%~5.0%； Si: 2.0%~6.0%; P：2.0%~3.0%； W：8.0%~12.0%； Be: 3.0%~5.0%; Mn: 1.0%~2.0%; balance is Fe, and the Fe content is not less than 7.0%.

2. The high-temperature resistant and wear-resistant rotary forging roll according to claim 1, characterized in that: The thickness of the high-temperature wear-resistant layer is 0.5mm to 2.5mm.

3. The high-temperature resistant and wear-resistant rotary forging roll according to claim 1, characterized in that: The specific process of step S2 is as follows: a laser coaxial powder feeder is used to feed wear-resistant and high-temperature resistant alloy powder to the surface of the rotary forging roll substrate, and a laser is used to perform layer-by-layer laser 3D printing; the laser is a fiber laser, and the printing adopts a multi-pass single-layer forming process.

4. The high-temperature resistant and wear-resistant rotary forging roll according to claim 3, characterized in that: The process parameters of the fiber laser are as follows: focal length of focusing lens f = 250mm~300mm, printing power P = 8000W, spot diameter D = 0.3mm~1.2mm, printing scanning speed V = 400mm / s~600mm / s, and overlap rate θ = 40%.

5. The high-temperature resistant and wear-resistant rotary forging roll according to claim 1, characterized in that: The specific composition of the wear-resistant and high-temperature resistant alloy powder includes the following components by weight percentage: Ni: 25.0%~29.0%; C: 6.0%~10.0%; Cr: 8.0%~9.5%; Co: 13.0%~16.0%; B：2.5%~4.5%； Si: 3.0%~5.0%; P：2.3%~2.8%； W：8.0%~10.0%； Be: 3.5%~4.5%; Mn: 1.0%~1.6%; balance Fe.

6. The high-temperature resistant and wear-resistant rotary forging roll according to claim 1, characterized in that: The wear-resistant and high-temperature resistant alloy powder is a regular spherical powder, and the proportion of spherical powder with a particle size of 45μm-120μm in the wear-resistant and high-temperature resistant alloy powder is not less than 90%.

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