A titanium-steel composite plate with a FeCoNiCr-based high-entropy alloy as a transition layer and a preparation method thereof

Abstract

The present invention provides a titanium-steel composite plate with an FeCoNiCr-based high-entropy alloy as a transition layer and a preparation method thereof. The titanium-steel composite plate includes a steel layer and a titanium layer. The titanium-steel composite plate also includes a transition layer. The steel layer is connected to the titanium layer via the transition layer. The transition layer is an FeCoNiCr-based high-entropy alloy. The present invention realizes high-quality rolled composite of steel and titanium by rationally controlling the blanking and rolling temperature, optimizing the rolling process, controlling the diffusion of alloy elements at the interface and the formation of intermetallic compounds.

Description

Technical field

[0001] The present invention relates to the technical field of titanium-steel composite plate preparation, in particular to a titanium-steel composite plate using a FeCoNiCr series high entropy alloy as a transition layer and a preparation method thereof. [Background Technology]

[0002] Steel has excellent mechanical properties and machinability, and its cost is relatively low, but its corrosion resistance is average. Titanium, on the other hand, has high specific strength and excellent corrosion resistance, but its cost is relatively high, making its economic viability a concern, especially when used in structural components. Titanium / steel cladding, by rationally combining steel and titanium, not only leverages the performance advantages of both materials but also reduces component costs. It is becoming a viable alternative to titanium alone and is widely used in civil and defense industries, such as the petroleum, chemical, and marine engineering sectors. The main methods for preparing titanium-steel clad plates include explosive cladding, diffusion cladding, explosive cladding-rolling, and rolling cladding. However, the explosive cladding process is complex, energy-intensive, environmentally polluting, and has a relatively low yield rate. The clad plates produced by the diffusion cladding method are relatively small, making them difficult to meet user requirements for larger plates. Thanks to the continuous upgrades of large-tonnage rolling mills and advancements in rolling technology for large-scale clad plates, large-scale titanium-steel clad plates can now be produced by rolling, significantly reducing their cost.

[0003] However, there are large differences in chemical composition and physical properties (such as melting point, linear expansion coefficient, thermal conductivity and specific heat capacity) between metallic titanium and steel, which leads to the easy generation of brittle intermetallic compounds and titanium carbide phases when the two are compounded, thereby reducing the bonding strength of the interface. Therefore, when titanium steel is rolled and compounded, the formation of interface brittle phases is usually reduced by adding a transition layer metal between titanium and steel, thereby improving the interface bonding strength. CN104907333A discloses a method for preparing a titanium-steel composite plate with nickel as an intermediate layer, CN104998903A discloses a method for preparing a titanium-steel composite plate with copper as an intermediate layer, and CN109693433B discloses a method for preparing a titanium-steel composite plate with IF steel as an intermediate layer. The addition of the transition layer metal effectively prevents the mutual diffusion between titanium and iron and improves the bonding effect of the composite interface.

[0004] Research has shown that high-entropy alloys (HEAs) exhibit four typical effects: the thermodynamic high-entropy effect, the kinetic hysteretic diffusion effect, the structural lattice distortion effect, and the performance cocktail effect. The high-entropy effect manifests itself in the formation of a simple, disordered solid solution structure rather than an intermetallic compound after uniform mutual dissolution. The hysteretic diffusion effect manifests itself in the complexity of the chemical composition and the severity of the lattice distortion, which make atomic diffusion within the alloy extremely difficult. These two effects help prevent the formation of thick intermetallic compound reaction layers at the interface during the joining of dissimilar metals, significantly reducing the tendency towards brittle failure during interfacial bonding. Furthermore, unlike pure component transition layer metals, high-entropy alloys (containing Cr) with corrosion resistance can improve the corrosion resistance of the transition layer and composite plates. FeCoNiCr-based high-entropy alloys are a candidate composition system that meets these requirements.

[0005] Therefore, in order to further improve the comprehensive interface performance of titanium-steel composite plates, it is necessary to develop a titanium-steel composite plate with high corrosion resistance and excellent interface bonding performance and a preparation method thereof. Therefore, the present invention provides a titanium-steel composite plate with a FeCoNiCr-based high-entropy alloy as a transition layer and a preparation method thereof to address the shortcomings of the existing technology and solve or alleviate one or more of the above problems. [Summary of the invention]

[0006] In view of this, the present invention provides a titanium-steel composite plate with a FeCoNiCr-based high-entropy alloy as a transition layer and a preparation method thereof. By rationally controlling the blanking and rolling temperature, optimizing the rolling process, and controlling the diffusion of alloy elements at the interface and the formation of intermetallic compounds, high-quality rolled composite of steel and titanium is achieved.

[0007] On the one hand, the present invention provides a titanium-steel composite plate with a FeCoNiCr-based high-entropy alloy as a transition layer, the titanium-steel composite plate including a steel layer and a titanium layer, the titanium-steel composite plate also including a transition layer, the steel layer being connected to the titanium layer through the transition layer, and the transition layer being a FeCoNiCr-based high-entropy alloy.

[0008] According to the aspects described above and any possible implementation method, an implementation method is further provided, in which the composition range of each component of the FeCoNiCr-based high-entropy alloy is greater than 5.0wt.% and less than 35.0wt.%, wherein 5.0%≤Fe≤35.0%, 5.0%≤Co≤35.0%, 5.0%≤Ni≤35.0%, and 5.0%≤Cr≤35.0%.

[0009] According to the above aspects and any possible implementation, an implementation is further provided, wherein the steel layer is a plain carbon steel plate, and the plain carbon steel plate is one or more of Q235 or Q345.

[0010] According to the above aspects and any possible implementation, an implementation is further provided, wherein the titanium material layer is an industrial titanium plate, and the industrial titanium plate is one or more of TA1 or TA2.

[0011] According to the above aspects and any possible implementation, an implementation is further provided, wherein the length ratio and width ratio of the steel layer and the titanium layer are both 1, and the thickness ratio is 1.0 to 5.0.

[0012] According to the above aspects and any possible implementation, there is further provided an implementation, wherein the length and width of the transition layer are the same as those of the steel layer and / or the titanium layer, and the thickness is 0.5 to 1.0 mm;

[0013] The steel layer has a length of 0.5 to 2 m, a width of 0.2 to 1 m, and a thickness of 10 to 30 mm;

[0014] The titanium material layer has a length of 0.5 to 2 m, a width of 0.2 to 1 m, and a thickness of 5 to 20 mm.

[0015] According to the aspects and any possible implementation methods described above, an implementation method is further provided, wherein the titanium-steel composite plate also includes a coating layer and an isolation layer, the coating layer includes an upper plate layer, a lower plate layer and four peripheral side plate layers, the upper plate layer is connected to the steel layer through the isolation layer, the lower plate layer is connected to the titanium layer through the isolation layer, and the four peripheral side plate layers are respectively coated on the four peripheral sides of the upper and lower connected steel layer and titanium layer.

[0016] According to the aspects and any possible implementation methods described above, an implementation method is further provided, wherein the coating layer is ordinary carbon steel A3, the length and width of the upper plate layer and the lower plate layer are 20 mm longer than the steel layer, and the thickness of the upper plate layer and the lower plate layer are both 6 to 10 mm.

[0017] According to the above aspects and any possible implementation, an implementation is further provided, wherein the isolation layer is a glass fiber isolation cloth, the length and width of the isolation layer are the same as those of the steel layer, and the thickness of the isolation layer is 1 to 2 mm.

[0018] According to the above aspects and any possible implementation, a method for preparing a titanium-steel composite plate with a FeCoNiCr-based high-entropy alloy as a transition layer is further provided, the preparation method comprising the following steps:

[0019] S1: Preset cladding layer, isolation layer, steel layer, transition layer and titanium layer, wherein the cladding layer is arranged outside the steel layer and the titanium layer, the isolation layer is arranged between the steel layer and the cladding layer and between the titanium layer and the cladding layer, and the transition layer is arranged between the steel layer and the titanium layer;

[0020] S2: Select ordinary carbon steel plate as the raw material for the steel layer, select industrial titanium plate as the raw material for the titanium layer; select high entropy alloy thin plate as the raw material for the transition layer;

[0021] S3: Ordinary carbon steel A3 is selected as the cladding layer, and glass fiber isolation cloth is selected as the isolation layer;

[0022] S4: Pre-treating the surfaces of the steel layer and the titanium layer to be in contact;

[0023] S5: assembling the composite plate according to the preset method;

[0024] S6: The gaps between the cladding layer, the steel layer, and the titanium layer are completely filled with ordinary carbon steel A3, and a circular hole with a diameter of 5 to 10 mm is reserved on either side of the cladding layer to form a first composite blank;

[0025] S7: Perform multi-pass argon arc welding on the four sides of the first composite billet, with a weld depth of 15 to 20 mm. After welding, vacuum treatment is performed through the reserved holes, and the vacuum degree is less than 5×10 -2 Pa, forming a second composite blank;

[0026] S8: heating the second composite billet to 890±20°C and holding the temperature for 2-4 hours, starting the rolling process at 845±20°C, with a single-pass reduction of 15%-30%, a total reduction of ≥75%, a final rolling temperature of 720°C or higher, and air cooling to room temperature to form a third composite billet;

[0027] S9: trimming, removing the sheath, and surface grinding the third composite blank to obtain a titanium-steel composite plate with a thickness of 2 to 16 mm. The plate width can reach 2.5 to 3 m, and the thickness ratio of the titanium-steel layer is adjustable.

[0028] Compared with the prior art, the present invention can achieve the following technical effects:

[0029] The rolling process of the present invention is simple, and the requirements for the raw material plate are low. The width of the composite plate finally prepared can reach 2.5 to 3 meters, and the thickness ratio of the titanium steel layer is adjustable. The transition layer high entropy alloy has corrosion resistance and can be used in marine engineering, outdoor and other fields, which can greatly increase the development and promotion of high-end titanium steel composite products.

[0030] Of course, any product implementing the present invention does not necessarily need to achieve all of the above-mentioned technical effects at the same time.

Brief Description of the Drawings

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0032] Figure 1 This is a method for assembling a composite plate containing a transition layer provided by one embodiment of the present invention;

[0033] Among them, in the figure:

[0034] 1-Outer sheath is ordinary carbon steel A3, 2-Glass fiber isolation cloth, 3-Ordinary carbon steel (Q235 or Q345), 4-High entropy alloy transition layer, 5-Titanium material (TA1 or TA2). [Specific implementation method]

[0035] In order to better understand the technical solution of the present invention, the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0036] It should be understood that the embodiments described are only a portion of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative work are within the scope of protection of the present invention.

[0037] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The singular forms "a", "an", "the" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise.

[0038] The present invention provides a titanium-steel composite plate with a FeCoNiCr-based high-entropy alloy as a transition layer and a preparation method thereof. The titanium-steel composite plate consists of a cladding layer, an isolation layer, a steel layer, a transition layer and a titanium layer, wherein:

[0039] The steel layer and the titanium layer are connected up and down through the transition layer;

[0040] The covering layer includes an upper plate layer, a lower plate layer and four peripheral side plate layers. The upper plate layer is connected to the steel layer through an isolation layer, and the lower plate layer is connected to the titanium layer through an isolation layer. The four peripheral side plate layers are respectively covered on the four peripheral sides of the upper and lower connected steel layer and titanium layer.

[0041] The length ratio and width ratio of the steel layer and the titanium layer are both 1, and the thickness ratio is 1.0-5.0. The raw material for the steel layer is ordinary carbon steel plate, and the raw material for the titanium layer is industrial titanium plate. The length and width of the transition layer are the same as those of the steel layer, and the thickness is 0.5-1.0 mm.

[0042] The plain carbon steel plate is one or more of Q235 and Q345.

[0043] The industrial titanium plate is one or more of TA1 and TA2.

[0044] The steel layer has a length of 0.5 to 2 m, a width of 0.2 to 1 m, and a thickness of 10 to 30 mm.

[0045] The titanium material layer has a length of 0.5 to 2 m, a width of 0.2 to 1 m, and a thickness of 5 to 20 mm.

[0046] The transition layer has a length of 0.5 to 2 m, a width of 0.2 to 1 m, and a thickness of 0.5 to 1.0 mm.

[0047] The cladding layer is made of ordinary carbon steel A3. The length and width of the upper plate layer and the lower plate layer are both 20 mm greater than the steel layer. The thickness of the upper plate layer and the lower plate layer are both 6 to 10 mm.

[0048] The isolation layer is a glass fiber isolation cloth. The length and width of the isolation layer are the same as those of the steel layer. The thickness of the isolation layer is 1 to 2 mm.

[0049] The present invention also provides a method for preparing a titanium-steel composite plate using a FeCoNiCr-based high-entropy alloy as a transition layer, which is used to prepare the titanium-steel composite plate. The preparation method comprises the following steps:

[0050] S1: Preset cladding layer, isolation layer, steel layer, transition layer and titanium layer, wherein the cladding layer is arranged outside the steel layer and the titanium layer, the isolation layer is arranged between the steel layer and the cladding layer and between the titanium layer and the cladding layer, and the transition layer is arranged between the steel layer and the titanium layer;

[0051] S2: Select ordinary carbon steel plate as the raw material for the steel layer, select industrial titanium plate as the raw material for the titanium layer; select high entropy alloy thin plate as the raw material for the transition layer;

[0052] S3: Ordinary carbon steel A3 is selected as the cladding layer, and glass fiber isolation cloth is selected as the isolation layer;

[0053] S4: Pre-treating the surfaces of the steel layer and the titanium layer to be in contact;

[0054] S5: assembling the composite plate according to the preset method;

[0055] S6: The gaps between the cladding layer, the steel layer, and the titanium layer are completely filled with ordinary carbon steel A3, and a circular hole with a diameter of 5 to 10 mm is reserved on either side of the cladding layer to form a first composite blank;

[0056] S7: Perform multi-pass argon arc welding on the four sides of the first composite billet, with a weld depth of 15 to 20 mm. After welding, vacuum treatment is performed through the reserved holes, and the vacuum degree is less than 5×10 -2 Pa, forming a second composite blank;

[0057] S8: heating the second composite billet to 890±20°C and holding the temperature for 2-4 hours, starting the rolling process at 845±20°C, with a single-pass reduction of 15%-30%, a total reduction of ≥75%, a final rolling temperature of 720°C or higher, and air cooling to room temperature to form a third composite billet;

[0058] S9: trimming, removing the sheath, and surface grinding the third composite blank to obtain a titanium-steel composite plate with a thickness of 2 to 16 mm. The plate width can reach 2.5 to 3 m, and the thickness ratio of the titanium-steel layer is adjustable.

[0059] The pre-processing process in S4 includes:

[0060] S41: machining the surfaces of the steel layer and the titanium layer to be in contact using a grinder to remove scales and stains on the surfaces to be in contact;

[0061] S42: Use alcohol solvent to deeply clean the surface of the machined steel layer and titanium layer and blow dry the workpiece surface.

[0062] Example 1:

[0063] Steel: Q235 (mass percentage by weight, C≤0.20%, Si≤0.30%, Mn≤0.70%, P≤0.045%, S≤0.045%, balance Fe), size: 200×1000×25mm.

[0064] High entropy alloy: HEA1 (mass percentage wt.%, Fe: 24.0-26.0%, Co: 24.0-26.0%, Ni: 24.0-26.0%, Cr: 24.0-26.0%), size: 200×1000×0.75 mm.

[0065] Titanium material: pure titanium TA1 (mass percentage wt.%, H≤0.015%, O≤0.20%, Fe≤0.25%, C≤0.10%, N≤0.03%, balance Ti), size: 200×1000×10 mm.

[0066] The specific steps are as follows:

[0067] S1: Use a grinder to machine the contact surfaces of steel and titanium materials to remove scale and stains on the contact surfaces; use alcohol solvent to deeply clean the processed steel and titanium surfaces and blow dry the workpiece surfaces.

[0068] S2: The materials and methods of assembly are ordinary carbon steel A3, glass fiber isolation cloth, ordinary carbon steel Q235, high entropy alloy HEA transition layer metal, TA1 titanium material, glass fiber isolation cloth, and ordinary carbon steel A3.

[0069] S3: The space between two ordinary carbon steel A3s is completely filled with the same material, with a circular hole of 5 to 10 mm in diameter left on one side for welding and sealing after vacuuming to form a composite billet; multiple passes of argon arc welding are performed on the four sides of the composite billet, with a weld depth of 15 to 20 mm. After welding, vacuum treatment is performed through the reserved hole, and the vacuum degree is less than 5.0×10 -2 Pa.

[0070] S4: heating the composite billet after welding to 890±20℃ and keeping it warm for 2h. The rolling temperature is 845±20℃, the single-pass reduction rate is 25%, the total reduction rate is ≥70%, the final rolling temperature is above 720℃, and air cooling is carried out to room temperature.

[0071] S5: After the rolled composite plate is trimmed, the jacket is removed, and the surface is ground, a high-strength titanium-steel composite plate with a thickness of 8 mm is obtained. The plate width can reach 3.2 m, and the titanium-steel layer thickness ratio is 0.4.

[0072] According to mechanical property tests, the shear strength of the titanium-steel composite interface containing high-entropy alloy transition layer metal is 299MPa.

[0073] Example 2:

[0074] Steel: Q345 (mass percentage by weight, C≤0.20%, Si≤0.55%, Mn≤1.60%, P≤0.045%, S≤0.045%, balance Fe), size: 200×1000×20mm.

[0075] High entropy alloy: HEA2 (mass percentage wt.%, Fe: 29.0-31.0%, Co: 19.0-21.0%, Ni: 24.0-26.0%, Cr: 24.0-26.0%), size: 200×1000×0.90 mm.

[0076] Titanium material: pure titanium TA1 (mass percentage wt.%, H≤0.015%, O≤0.20%, Fe≤0.25%, C≤0.10%, N≤0.03%, balance Ti), size: 200×1000×10 mm.

[0077] The specific steps are as follows:

[0078] S1: Use a grinder to machine the contact surfaces of steel and titanium materials to remove scale and stains on the contact surfaces; use alcohol solvent to deeply clean the processed steel and titanium surfaces and blow dry the workpiece surfaces.

[0079] S2: The materials and methods of assembly are ordinary carbon steel A3, glass fiber isolation cloth, ordinary carbon steel Q235, high entropy alloy HEA transition layer metal, TA1 titanium material, glass fiber isolation cloth, and ordinary carbon steel A3.

[0080] S3: The space between two ordinary carbon steel A3s is completely filled with the same material, with a circular hole of 5 to 10 mm in diameter left on one side for welding and sealing after vacuuming to form a composite billet; multiple passes of argon arc welding are performed on the four sides of the composite billet, with a weld depth of 15 to 20 mm. After welding, vacuum treatment is performed through the reserved hole, and the vacuum degree is less than 5.0×10 -2 Pa.

[0081] S4: heating the composite billet after welding to 890±20℃ and keeping it warm for 2h. The rolling temperature is 845±20℃, the single-pass reduction rate is 25%, the total reduction rate is ≥70%, the final rolling temperature is above 720℃, and air cooling is carried out to room temperature.

[0082] S5: After the rolled composite plate is trimmed, the jacket is removed, and the surface is ground, a high-strength titanium-steel composite plate with a thickness of 8 mm is obtained. The plate width can reach 3.2 m, and the titanium-steel layer thickness ratio is 0.5.

[0083] According to mechanical property tests, the shear strength of the titanium-steel composite interface containing high-entropy alloy transition layer metal is 344MPa.

[0084] The above describes in detail a titanium-steel composite plate with an FeCoNiCr-based high-entropy alloy as a transition layer and its preparation method, as provided in the examples of this application. The description of the above examples is intended only to help understand the method and core concept of this application; at the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concepts of this application. In summary, the contents of this specification should not be construed as limiting this application.

[0085] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different nouns to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" and "comprising" mentioned throughout the specification and claims are open-ended terms, so they should be interpreted as "including / including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve the technical problems within a certain error range and basically achieve the technical effects. The subsequent description in the specification is a preferred embodiment of the present application, but the description is for the purpose of illustrating the general principles of the present application, and is not used to limit the scope of the present application. The scope of protection of the present application shall be as defined in the attached claims.

[0086] It should also be noted that the terms "include," "comprises," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a product or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such product or system. In the absence of further limitations, an element defined by the phrase "comprises a..." does not exclude the presence of other identical elements in the product or system comprising the element.

[0087] It should be understood that the term "and / or" as used herein is merely a description of the relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Furthermore, the character " / " in this document generally indicates that the associated objects are in an "or" relationship.

[0088] The above description shows and describes several preferred embodiments of the present application. However, as previously mentioned, it should be understood that the present application is not limited to the form disclosed herein and should not be construed as excluding other embodiments. Instead, the present application can be used in various other combinations, modifications, and environments and can be modified within the scope of the application concept described herein through the above teachings or technology or knowledge in the relevant field. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of the present application should be protected by the claims appended hereto.

Claims

1. A method for preparing a titanium-steel composite plate with a FeCoNiCr-based high entropy alloy as a transition layer, characterized in that: The preparation method comprises the following steps: S1: A cladding layer, an isolation layer, a steel layer, a transition layer, and a titanium layer are preset, wherein the cladding layer is arranged outside the steel layer and the titanium layer, the isolation layer is arranged between the steel layer and the cladding layer and between the titanium layer and the cladding layer, and the transition layer is arranged between the steel layer and the titanium layer; S2: Select ordinary carbon steel plate as the raw material for the steel layer, select industrial titanium plate as the raw material for the titanium layer; select high entropy alloy thin plate as the raw material for the transition layer; S3: Ordinary carbon steel A3 is selected as the cladding layer, and glass fiber isolation cloth is selected as the isolation layer; S4: Pre-treating the surfaces of the steel layer and the titanium layer to be in contact; S5: assembling the composite plate according to the preset method; S6: The gaps between the cladding layer and the steel layer and titanium layer are completely filled with ordinary carbon steel A3, and a circular hole with a diameter of 5 to 10 mm is reserved on either side of the cladding layer to form a first composite blank; S7: Multi-pass argon arc welding is performed on the four sides of the first composite billet, with a weld depth of 15-20 mm. After welding, vacuum treatment is performed through the reserved holes, and the vacuum degree is less than 5×10 -2 Pa, forming a second composite blank; S8: heating the second composite billet to 890±20℃ and holding the temperature for 2-4 hours, starting the rolling process at 845±20℃, with a single-pass reduction of 15%-30%, a total reduction of ≥75%, a final rolling temperature of 720℃ or higher, and air cooling to room temperature to form a third composite billet; S9: trimming, removing the jacket, and surface grinding the third composite blank to obtain a titanium-steel composite plate with a thickness of 2 to 16 mm. The plate width can reach 2.5 to 3 m, and the thickness ratio of the titanium-steel layer is adjustable; A titanium-steel composite plate with a FeCoNiCr-based high-entropy alloy as a transition layer is prepared by the preparation method, wherein the titanium-steel composite plate comprises a steel layer and a titanium layer, and further comprises a transition layer, wherein the steel layer is connected to the titanium layer via the transition layer, and the transition layer is a FeCoNiCr-based high-entropy alloy; The titanium-steel composite plate also includes a coating layer and an isolation layer. The coating layer includes an upper plate layer, a lower plate layer and four peripheral side plate layers. The upper plate layer is connected to the steel layer through the isolation layer, and the lower plate layer is connected to the titanium layer through the isolation layer. The four peripheral side plate layers are respectively coated on the four peripheral sides of the upper and lower connected steel layer and titanium layer.

2. The preparation method according to claim 1, characterized in that The composition range of each component of the FeCoNiCr-based high-entropy alloy is greater than 5.0wt.% and less than 35.0wt.%, wherein 5.0%≤Fe≤35.0%, 5.0%≤Co≤35.0%, 5.0%≤Ni≤35.0%, and 5.0%≤Cr≤35.0%.

3. The preparation method according to claim 1, characterized in that The steel layer is a plain carbon steel plate, and the plain carbon steel plate is one or more of Q235 and Q345.

4. The preparation method according to claim 1, characterized in that The titanium material layer is an industrial titanium plate, and the industrial titanium plate is one or more of TA1 and TA2.

5. The preparation method according to claim 1, characterized in that The length ratio and width ratio of the steel layer and the titanium layer are both 1, and the thickness ratio is 1.0-5.

0.

6. The preparation method according to claim 5, characterized in that The length and width of the transition layer are the same as those of the steel layer and / or titanium layer, and the thickness is 0.5-1.0 mm; The steel layer has a length of 0.5 to 2 m, a width of 0.2 to 1 m, and a thickness of 10 to 30 mm; The titanium material layer has a length of 0.5 to 2 m, a width of 0.2 to 1 m, and a thickness of 5 to 20 mm.

7. The preparation method according to claim 1, characterized in that The cladding layer is made of ordinary carbon steel A3. The length and width of the upper plate layer and the lower plate layer are both 20 mm longer than the steel layer. The thickness of the upper plate layer and the lower plate layer are both 6-10 mm.

8. The preparation method according to claim 1, characterized in that The isolation layer is a glass fiber isolation cloth. The length and width of the isolation layer are the same as those of the steel layer. The thickness of the isolation layer is 1-2 mm.

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