Composite board and method for manufacturing the same

Abstract

The application provides a composite plate and a preparation method thereof, and relates to the technical field of metal composite materials. The preparation method of the composite plate comprises the following steps: preparing a main material and an auxiliary material, the main material is selected from at least one of a titanium Damascus plate and a zirconium Damascus plate, and the auxiliary material comprises a high-carbon powder stainless steel plate and a 304 stainless steel plate; arranging the layers of materials in sequence to form a laminated structure, the laminated structure comprises at least an outer layer of the main material, a middle layer of the 304 stainless steel plate and a core layer of the high-carbon powder stainless steel plate; and through edge sealing welding, heating, forging, cooling, trimming, edge cutting and surface treatment, the composite plate is prepared, the hardness of the obtained plate can reach 59-61.5 HRC, and there is no delamination phenomenon in 110-degree bending. The 304 stainless steel transition layer effectively solves the delamination problem of the titanium / zirconium Damascus and the powder stainless steel caused by the mismatch of thermal physical properties, and the prepared plate has the beautiful pattern of the titanium / zirconium Damascus and the high hardness of the powder stainless steel, and is suitable for outdoor tool manufacturing.

Description

Technical Field

[0001] This invention belongs to the field of metal composite materials technology, specifically relating to a composite sheet and its preparation method. More particularly, it relates to a titanium-mass steel / zirconium-mass steel composite sheet for outdoor knives and its preparation method. Background Technology

[0002] Damascus steel, due to its unique texture and excellent overall performance, has long been widely used in the manufacture of high-end cutting tools. In recent years, with the development of materials science, titanium damascus and zirconium damascus have gradually come into view as new types of damascus materials. Titanium damascus is made of two or more titanium alloys through lamination and mosaic processes, and features corrosion resistance, non-magnetism, and lightweight properties. Zirconium damascus, on the other hand, is a zirconium alloy-based damascus material developed from titanium damascus. Compared to titanium alloys, zirconium alloys have higher surface strength and hardness, and are easier to oxidize and color.

[0003] However, while existing titanium mascarp and zirconium mascarp materials possess excellent corrosion resistance and aesthetically pleasing patterns, their hardness is often insufficient to meet the stringent requirements of outdoor knives for edge sharpness and wear resistance. Current multi-layer composite steel plate technologies for knives, such as pure titanium and steel composites, mostly employ explosive bonding methods. This method is limited to ordinary carbon steel; when high-carbon, high-hardness steels are bonded using explosive bonding, irreversible defects or even fractures can occur both internally and externally.

[0004] In addition, existing methods for preparing damascus titanium or zirconium mainly involve processes such as pattern design, substrate cleaning and surface treatment, vacuum hot deposition casting, argon arc welding reinforcement, forging, rolling, and heat treatment. However, these methods mainly focus on the pattern formation of the titanium / zirconium substrate itself and do not involve technical solutions for composite steel sandwiching of high-hardness powder stainless steel with titanium / zirconium damascus materials.

[0005] Therefore, how to organically combine the beautiful patterns of titanium masers or zirconium masers with the high hardness and high wear resistance of high-carbon powder stainless steel, while ensuring that each layer of material achieves good metallurgical bonding without delamination during the forging and compounding process, is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0006] The technical problem solved by this invention: This invention addresses the shortcomings of existing technologies, such as insufficient hardness of titanium masers and zirconium masers, and the inability of existing composite steel plate technologies to simultaneously achieve both aesthetically pleasing patterns and high hardness. It provides a titanium masers / zirconium masers steel-coated composite plate and its preparation method, aiming to combine the aesthetically pleasing patterns of titanium masers or zirconium masers with the high hardness and high wear resistance of high-carbon powder stainless steel plates to obtain a high-performance composite plate that combines both decorative and functional properties.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: A method for preparing a composite board includes the following steps: (1) Material preparation: Prepare main materials and auxiliary materials. The main materials are selected from at least one of titanium maser sheet and zirconium maser sheet. The auxiliary materials include high carbon powder stainless steel sheet and 304 stainless steel sheet. (2) Stacked assembly: The main material and auxiliary material are arranged in order from bottom to top to form a stacked structure. The stacked structure includes at least an outer main material layer, a middle 304 stainless steel plate layer and a core high carbon powder stainless steel plate layer. (3) Weld the edges of the arranged stacked structure; (4) Heat the welded blank; (5) Forging is performed after heating; (6) After forging, the material is cooled, trimmed, and then surface treated.

[0008] As a preferred embodiment, in step (2), the stacked structure is arranged from bottom to top as follows: Titanium Maestro plate → 304 stainless steel plate → high carbon powder stainless steel plate → 304 stainless steel plate → Titanium Maestro plate.

[0009] As a preferred embodiment, in step (2), the stacked structure is arranged from bottom to top as follows: titanium plate → zirconium masquerade plate → 304 stainless steel plate → high carbon powder stainless steel plate → 304 stainless steel plate → zirconium masquerade plate → titanium plate.

[0010] As a preferred implementation scheme, in step (1), the thickness of each material is calculated based on the finished product size requirements, wherein: the thickness range of titanium mascarpment or zirconium mascarpment is 4mm to 8mm; the thickness range of 304 stainless steel plate is 0.5mm to 1mm; and the thickness range of high carbon powder stainless steel plate is 3mm to 5mm.

[0011] As a preferred embodiment, the high-carbon powder stainless steel sheet is selected from M390 powder stainless steel sheet or S90V powder stainless steel sheet (including but not limited to these two types of steel).

[0012] As a preferred embodiment, in step (1), the material preparation further includes: cutting all main materials and auxiliary materials into predetermined sizes, polishing the surfaces of all main materials and auxiliary materials to a mirror finish with a surface roughness Ra≤0.8, and cleaning them after polishing to ensure that the board surface is smooth, flat and clean.

[0013] As a preferred embodiment, in step (3), the edge sealing welding is to use titanium strips to seal the four sides of the arranged stacked structure, and no pores or leaks are allowed after welding; the edge sealing welding is performed by argon arc welding.

[0014] As a preferred implementation scheme, In step (4), the heating is to place the welded billet into a resistance furnace and heat it to the forging temperature and hold it at that temperature; wherein the heating temperature range is 1050℃~1180℃ and the holding time is no more than 30min. In step (5), the forging is carried out using a four-column hydraulic press, a forging press or an air hammer, and the forging method is free forging or die forging; the forging temperature range is 1000℃~1150℃, the forging pressure is 50~60MPa, and the deformation amount of one forging is not less than 20%.

[0015] As a preferred embodiment, in step (6), the cooling is air cooling or furnace cooling; the trimming and trimming is done by wire cutting; and the surface treatment is done by planing or grinding the surface of the board to remove the black skin and outer material layer.

[0016] The present invention also provides a composite board, which is prepared by any of the preparation methods described above.

[0017] Advantages of this invention compared to existing technologies: 1. This solution combines aesthetically pleasing patterns with high hardness: By using titanium mascarp or zirconium mascarp as the outer layer material and high-carbon powder stainless steel plate (M390 or S90V) as the core layer material, the composite plate has both the unique and beautiful patterns of titanium mascarp or zirconium mascarp and the high hardness of high-carbon powder stainless steel plate (the measured hardness can reach 59-61.5HRC), thus taking into account both decoration and functionality. 2. The interlayer bonding of this solution is strong: By setting a 304 stainless steel transition layer between the titanium / zirconium mases and the high-carbon powder stainless steel plate, the problem of composite difficulties caused by the incompatibility of thermal properties of dissimilar metal materials is effectively solved. Bending strength tests verified that there was no delamination of the composite layer during a 110° bend, indicating that a good metallurgical bond was achieved between the layers. 3. This solution has a simple process and controllable cost: it adopts conventional process equipment such as resistance furnace heating, forging, and air cooling, without the need for expensive equipment such as vacuum hot isostatic pressing. The process route is simple and suitable for large-scale production. 4. This solution has a wide range of applications: Titanium maserk or zirconium maserk can be selected as the outer layer material and M390 or S90V as the core layer material as needed. The material combination can be flexibly adjusted to meet the needs of different application scenarios, and it is especially suitable for the manufacture of high-end outdoor knives. Attached Figure Description

[0018] Figure 1 This is a cross-sectional schematic diagram of the stacked structure of the present invention. (a) is a titanium maser steel laminated structure, and (b) is a zirconium maser steel laminated structure. Figure 2 This is a schematic diagram of the structure of the finished composite board of the present invention; Figure 3 This is a hardness test report for an embodiment of the present invention; Figure 4 This is a bending test report for an embodiment of the present invention. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. 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.

[0020] Please see Figure 1-4 The embodiments of the present invention are described in detail below.

[0021] The technical principle of this invention for reliably combining titanium maserite / zirconium maserite with high-carbon powder stainless steel is as follows: First, this invention incorporates a 304 stainless steel plate as an intermediate transition layer in the laminated structure. There are significant differences in physical properties such as thermal expansion coefficient and thermal conductivity between titanium masers (titanium alloy) or zirconium masers (zirconium alloy) and high-carbon powder stainless steel (M390 or S90V). Directly combining these two materials can easily lead to interface cracking or delamination during heating and cooling due to thermal stress mismatch. The thermal expansion coefficient of 304 stainless steel falls between that of titanium / zirconium alloy and high-carbon powder stainless steel, effectively buffering and coordinating the thermal stress differences between the different material layers during hot working, thus serving as stress buffering and a transitional connection.

[0022] Secondly, this invention employs an edge-sealing welding process to seal the four sides of the laminated structure, forming a closed encapsulation structure. This prevents oxidation at the interfaces of the material layers during heating, ensuring good metallurgical bonding of the fresh metal surfaces during forging. Furthermore, the sealed welding prevents decarburization of high-carbon powder stainless steel during high-temperature heating, ensuring the core material ultimately achieves high hardness.

[0023] Furthermore, this invention controls the deformation amount in a single forging press to be at least 30%. This deformation amount is sufficient to allow adequate plastic flow at the interface between the material layers, breaking down the oxide film at the interface, allowing fresh metals to come into contact with each other, and achieving atomic diffusion bonding under pressure to form a strong metallurgical bonding interface. At the same time, the appropriate deformation amount also promotes the expected plastic flow and deformation of the patterns in the titanium or zirconium maser layer, forming an aesthetically pleasing texture.

[0024] Finally, after air cooling, wire cutting trimming and planing / grinding surface treatment are performed to remove the black skin and outer titanium plate layer formed during forging (for zirconium maser solutions), revealing the pattern of the middle titanium maser or zirconium maser layer, while exposing the high-carbon powder stainless steel core layer to the surface, facilitating subsequent hardness testing and tool edge machining.

[0025] Example 1

[0026] This embodiment provides a method for preparing titanium-mass steel composite plates, the specific steps of which are as follows: I. Material Preparation Prepare the following materials: Main material: 4mm thick titanium maser sheet (made from CP titanium and 6Al-4V titanium alloy by stack forging process), cut to the predetermined size; Auxiliary materials: 3mm thick M390 high carbon powder stainless steel plate, 0.5mm thick 304 stainless steel plate, cut to the predetermined size.

[0027] Among them, the M390 high-carbon powder stainless steel plate is an externally purchased material with the following composition: C: 1.90wt% Cr: 20.00wt% V: 4.00wt% Mo: 1.00wt% W: 0.60wt% Si: 0.70wt% Mn: 0.30wt% P, S (impurity elements) ≤0.03wt% Fe: balance.

[0028] All main and auxiliary materials are polished to a mirror finish with Ra≤0.8. After polishing, they are cleaned to ensure that each board surface is smooth, flat and clean.

[0029] II. Stacked Assembly The above materials are arranged in a layered structure from bottom to top: Titanium Maestro plate → 304 stainless steel plate → M390 high-carbon powder stainless steel plate → 304 stainless steel plate → Titanium Maestro plate (e.g., Figure 1 (as shown in (a)).

[0030] The four sides of the arranged plates are sealed with titanium strips under argon protection to ensure that the weld is continuous, without pores or leaks.

[0031] The welded blank is placed in a resistance furnace and heated to a predetermined temperature for a specified duration. In this embodiment, the heating temperature range is 1050℃, and the holding time range is 20 minutes.

[0032] After heating, the product is removed from the furnace and immediately subjected to forging. A four-column hydraulic press is used for free forging. The forging temperature is 1000℃, the forging pressure is 50MPa, and the deformation amount of one forging is controlled at 30%.

[0033] After forging, the material is air-cooled. After air cooling, wire cutting is used for trimming the edges. Then, a planer or grinder is used for surface treatment of the sheet metal to remove the black outer layer and other material layers, revealing the pattern of the titanium mascarp layer and exposing the M390 steel core layer. Figure 2 As shown.

[0034] III. Finished Product Inspection The prepared composite panels were sampled and tested. The sample was machined to remove the surface layer, exposing the intermediate steel core layer (M390) on the surface. Rockwell hardness testing was performed. The measured hardness in the thickness direction of the steel plate was 59 HRC, and the measured hardness in the surface direction was 61.5 HRC. The hardness test report is as follows: Figure 3 As shown.

[0035] A bending strength test was conducted on the multilayer composite board. The test results showed that cracking occurred on the back side upon bending at 110°, but no delamination of the composite layers was observed. The bending test report is as follows: Figure 4 As shown.

[0036] The titanium maser steel composite sheet prepared in this embodiment combines the beautiful patterns of titanium maser steel with the high hardness and wear resistance of M390, making it suitable for manufacturing high-end outdoor knives.

[0037] Example 2

[0038] This embodiment provides a method for preparing zirconium maser steel composite plates, the specific steps of which are as follows: I. Material Preparation Prepare the following materials: Main materials: 8mm thick zirconium masquerade sheet (made by adding R60702 or R60705 to titanium masquerade material and preparing it through stacking forging process), titanium plate, cut to the predetermined size; Auxiliary materials: 5mm thick S90V high carbon powder stainless steel plate, 1mm thick 304 stainless steel plate, cut to the predetermined size.

[0039] The S90V high-carbon powder stainless steel plate is an externally purchased material with the following composition: C: 2.30wt% Cr: 14.00wt% V: 9.00wt% Mo: 1.00wt% Mn: ≤0.50wt% Si: ≤0.50wt% P: ≤0.03wt% S: ≤0.03wt% Fe: balance.

[0040] All main and auxiliary materials are polished to a mirror finish with Ra≤0.8. After polishing, they are cleaned to ensure that each board surface is smooth, flat and clean.

[0041] II. Stacked Assembly The above materials are arranged in a layered structure from bottom to top: titanium plate → zirconium serge plate → 304 stainless steel plate → S90V high-carbon powder stainless steel plate → 304 stainless steel plate → zirconium serge plate → titanium plate (e.g.) Figure 1 (b) shown).

[0042] The four sides of the arranged plates are sealed with titanium strips using argon arc welding to ensure continuous welds without pores or leaks.

[0043] The welded blank is placed in a resistance furnace and heated to a predetermined temperature for a specified duration. In this embodiment, the heating temperature range is 1180℃, and the holding time ranges from 30 minutes.

[0044] After heating, the product is removed from the furnace and immediately subjected to forging. A forging press is used for free forging at a forging temperature of 1150℃ and a forging pressure of 60MPa, with the deformation amount controlled at 25% per forging.

[0045] After forging, the plate is cooled in the furnace. After cooling, the edges are trimmed by wire cutting. Then, the plate surface is treated by planing or grinding to remove the black skin and outer titanium plate layer, so that the pattern of the zirconium masquerade layer can be revealed, and the middle S90V steel core layer is exposed.

[0046] III. Finished Product Inspection The prepared composite panels were sampled and tested. The sample was machined to remove the surface layer, exposing the intermediate steel core layer (S90V) on the surface. Rockwell hardness testing was performed. The measured hardness in the thickness direction of the steel plate was 59.5 HRC, and the measured hardness in the surface direction of the steel plate was 61 HRC. The hardness test report is as follows: Figure 3 As shown.

[0047] A bending strength test was conducted on the multilayer composite board. The test results showed that cracking occurred on the back side upon bending at 110°, but no delamination of the composite layers was observed. The bending test report is as follows: Figure 4 As shown.

[0048] The zirconium masquerade steel-clad composite sheet prepared in this embodiment combines the vibrant patterns of zirconium masquerade with the high hardness and wear resistance of S90V. Compared with the titanium masquerade layer, the zirconium masquerade layer has higher surface strength and a more vibrant coloring effect, making it particularly suitable for making high-end collectible outdoor knives.

[0049] Example 3

[0050] The difference between this embodiment and Embodiment 1 is that the high-carbon powder stainless steel core layer uses S90V instead of M390; all other steps and parameters are the same as in Embodiment 1. The resulting composite plate also exhibits excellent comprehensive performance, with hardness test results comparable to those of Embodiment 1, and no delamination of the composite layer observed during bending tests.

[0051] The composite board and its preparation method provided by this invention have a clear process route, are easy to operate, and have strong equipment versatility. The prepared composite board has both beautiful patterns and high hardness and high wear resistance, with strong interlayer bonding. It is particularly suitable for the manufacture of high-end outdoor knives and has broad industrial application prospects and market economic value.

[0052] 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 its spirit or essential characteristics. 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, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0053] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for preparing a composite board, characterized in that: Includes the following steps: (1) Material preparation: Prepare main materials and auxiliary materials. The main materials are selected from at least one of titanium maser sheet and zirconium maser sheet. The auxiliary materials include high carbon powder stainless steel sheet and 304 stainless steel sheet. (2) Stacked assembly: The main material and auxiliary material are arranged in order from bottom to top to form a stacked structure. The stacked structure includes at least an outer main material layer, a middle 304 stainless steel plate layer and a core high carbon powder stainless steel plate layer. (3) Weld the edges of the arranged stacked structure; (4) Heat the welded blank; (5) Forging is performed after heating; (6) After forging, the material is cooled, trimmed, and then surface treated.

2. The method for preparing the composite board according to claim 1, characterized in that: In step (2), the stacked structure is as follows from bottom to top: Titanium Maestro plate → 304 stainless steel plate → high carbon powder stainless steel plate → 304 stainless steel plate → Titanium Maestro plate.

3. The method for preparing the composite board according to claim 1, characterized in that: In step (2), the stacked structure is arranged from bottom to top as follows: titanium plate → zirconium masquerade plate → 304 stainless steel plate → high carbon powder stainless steel plate → 304 stainless steel plate → zirconium masquerade plate → titanium plate.

4. The method for preparing the composite board according to claim 1, characterized in that: In step (1), the thickness of each material is calculated based on the finished product size requirements. Specifically, the thickness range of titanium mascarp or zirconium mascarp is 4mm to 8mm; the thickness range of 304 stainless steel is 0.5mm to 1mm; and the thickness range of high carbon powder stainless steel is 3mm to 5mm.

5. The method for preparing the composite board according to claim 1, characterized in that: The high-carbon powder stainless steel plate is selected from M390 powder stainless steel plate or S90V powder stainless steel plate.

6. The method for preparing the composite board according to claim 1, characterized in that: In step (1), the material preparation also includes: cutting all main materials and auxiliary materials into predetermined sizes, polishing the surfaces of all main materials and auxiliary materials to a mirror finish with a surface roughness Ra≤0.8, and cleaning after polishing.

7. The method for preparing the composite board according to claim 1, characterized in that: In step (3), the edge sealing welding is to use titanium strips to seal the four sides of the arranged stacked structure. After welding, there should be no gaps or leaks. The edge sealing welding is done by argon arc welding.

8. The method for preparing the composite board according to claim 1, characterized in that: In step (4), the heating is to place the welded billet into a resistance furnace and heat it to the forging temperature and hold it at that temperature; wherein the heating temperature range is 1050℃~1180℃ and the holding time is no more than 30min. In step (5), the forging is carried out using a four-column hydraulic press, a forging press or an air hammer, and the forging method is free forging or die forging; the forging temperature range is 1000℃~1150℃, the forging pressure is 50~60MPa, and the deformation amount of one forging is not less than 20%.

9. The method for preparing the composite board according to claim 2, characterized in that: In step (6), the cooling is air cooling or furnace cooling; the trimming and edge trimming is done by wire cutting; the surface treatment is done by planing or grinding the surface of the board to remove the black skin and outer material layer.

10. A composite board, characterized in that: It is prepared by the preparation method described in any one of claims 1 to 9.

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