Titanium alloy plate resistant to projectile impact and preparation method and application of titanium alloy plate

Abstract

The invention provides a projectile impact resistant titanium alloy plate and a preparation method and application thereof, and relates to the technical field of high-strength steel for armor protection, and the projectile impact resistant titanium alloy plate is formed by hot rolling compounding and heat treatment of at least one high-strength titanium alloy base plate and at least one energy-absorbing titanium alloy base plate, the high-strength titanium alloy base plates and the energy-absorbing titanium alloy base plates are alternately stacked; the high-strength titanium alloy base plate on the outermost side is a projectile body impact surface of the projectile body impact resistant titanium alloy plate; the thickness ratio of the high-strength titanium alloy substrate to the energy-absorbing titanium alloy substrate adjacent to the high-strength titanium alloy substrate to the energy-absorbing titanium alloy substrate is 1: (1-20); the impedance ratio of the high-strength titanium alloy substrate to the energy-absorbing titanium alloy substrate adjacent to the high-strength titanium alloy substrate to the energy-absorbing titanium alloy substrate is (1.025-1.25): 1. By compounding two materials with different impedances, controllable unloading of incident stress is achieved, peak stress is reduced through plastic energy absorption of the back plate, crack initiation is inhibited, and BFS is reduced.

Description

Technical Field

[0001] This invention relates to the field of high-strength armor protection steel technology, and in particular to a titanium alloy plate resistant to projectile impact, its preparation method and application. Background Technology

[0002] As a pillar industry of the national economy and defense industry, the materials industry plays a crucial supporting role in equipment performance and safety assurance. Despite the rapid development of protective technologies both domestically and internationally in recent years, with the emergence of various protective materials such as ceramics, polymer composites, and lightweight alloys, titanium and titanium alloy plates demonstrate outstanding advantages in armor applications requiring weight reduction and corrosion resistance, thanks to their high specific strength and excellent corrosion resistance. Among these, high-strength, high-toughness titanium / titanium alloy armor plates show great application potential in terms of mechanical properties and ballistic / corrosion resistance.

[0003] Currently available ballistic impact resistant composite materials still have many problems that need to be solved in practical applications: First, its insufficient impact resistance is particularly prominent. Specifically, when subjected to large impact energy, the protective performance of the plate decreases significantly, failing to meet the requirements of high safety level protection, and is prone to penetration or severe deformation. Secondly, under significant impact, the interlayer bond strength of the composite board decreases considerably, leading to delamination. This delamination not only affects the overall protective performance of the board but also causes structural damage and a shortened service life. Furthermore, the interlayer bonding methods and material ratio designs of existing composite panels are still imperfect, failing to effectively meet performance requirements under complex impact load conditions. These problems severely restrict the widespread application of ballistic impact-resistant composite panels in military protection, aerospace, and other fields.

[0004] Therefore, there is an urgent need for a titanium alloy plate that is resistant to projectile impacts to be used in titanium / titanium alloy armor plates to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a titanium alloy plate resistant to projectile impact, its preparation method and application. By combining high-strength and high-toughness materials, the incident stress can be controlled and unloaded. The plastic energy absorption of the back plate reduces peak stress, inhibits interlaminar cracking and reduces BFS.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: This invention provides a titanium alloy plate resistant to projectile impact, which is formed by hot rolling and heat treatment of at least one high-strength titanium alloy substrate and at least one energy-absorbing titanium alloy substrate, wherein the high-strength titanium alloy substrate and the energy-absorbing titanium alloy substrate are alternately stacked; the outermost high-strength titanium alloy substrate is the projectile impact surface of the titanium alloy plate resistant to projectile impact. The thickness ratio of two adjacent high-strength titanium alloy substrates and energy-absorbing titanium alloy substrates is 1:(1-20). The impedance ratio of two adjacent high-strength titanium alloy substrates and energy-absorbing titanium alloy substrates is (1.025-1.25):1.

[0007] Furthermore, based on the above technical solution, the impedance of the high-strength titanium alloy substrate is (2.15~3.05)×10. 7 Pa·s / m; And / or, the impedance of the energy-absorbing titanium alloy substrate is (2.01~2.85)×10 7 Pa·s / m; And / or, the thickness of the high-strength titanium alloy substrate after hot rolling composite is 1-10 mm; And / or, the thickness of the energy-absorbing titanium alloy substrate after hot rolling composite is 1-50 mm; And / or, the absolute value of the reflection coefficient of the titanium alloy plate resistant to ballistic impact is 0.05-0.2.

[0008] Furthermore, based on the above technical solution, the high-strength titanium alloy substrate and the energy-absorbing titanium alloy substrate, by mass percentage, both comprise the following components: Al: 2.0-7.0%, V: 0-10%, Mo: 0-5.5%, Cr: 0-3.0%, Zr+Nb: 0-4.5%, Sn: 0.0-2.2%, Fe: 0.1-3.0%, Mn+Ni: 0-1.0%, Si: 0-0.5%, O: 0.05-0.20%, B: 0-0.1%, C: 0.03-0.12%, RE: ≤0.1%, impurity elements N≤0.05%, H≤0.015%, and the remainder is Ti and other uncontrollable residual elements.

[0009] Furthermore, based on the above technical solution, the high-strength titanium alloy substrate includes one of TC11, TA15, Ti6242-Si, Ti5553, Ti-1023, Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe-C, Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe-B / C, and TC4-M1; And / or, the energy-absorbing titanium alloy substrate includes one of: TC4, TA15, ATI425, Timetal62s, and TC4-M2.

[0010] Furthermore, based on the above technical solution, the thickness of the titanium alloy plate for resisting projectile impact is 2-120mm; And / or, the high-strength titanium alloy substrate has a yield strength of 1000-1300MPa, a tensile strength of 1100-1600MPa, an elongation of 6-15%, and an impact energy of over 14J at -40℃. And / or, the yield strength of the energy-absorbing titanium alloy substrate is 850-1100MPa, the tensile strength is 980-1300MPa, the elongation is 10-18%, and the impact energy at -40℃ reaches more than 14J. And / or, the yield strength of the titanium alloy plate resistant to ballistic impact is 850-1300 MPa, the tensile strength is 980-1600 MPa, the elongation is 6-18%, and the impact energy at -40℃ reaches more than 14 J.

[0011] Furthermore, based on the above technical solution, the surface bonding rate of the two adjacent hot-rolled composite high-strength titanium alloy substrates and the hot-rolled composite energy-absorbing titanium alloy substrates in the ballistic impact resistant titanium alloy plate is 100%.

[0012] The present invention also provides a method for preparing the projectile-resistant titanium alloy plate as described above, comprising the following steps: S1: At least one high-strength titanium alloy substrate and at least one energy-absorbing titanium alloy substrate are alternately stacked and then hot-rolled to obtain a hot-rolled composite titanium alloy sheet. S2: The hot-rolled composite titanium alloy sheet is subjected to a combination of annealing and solution aging treatment to obtain a titanium alloy sheet resistant to projectile impact.

[0013] Furthermore, based on the above technical solution, the combined solid solution aging treatment is a combination of solid solution treatment and high-temperature aging treatment; or, Solution treatment, low-temperature aging, and high-temperature aging treatment.

[0014] Furthermore, based on the above technical solution, the hot rolling conditions include: an initial rolling temperature of 920-1050℃, a final rolling temperature of 800-900℃, and a deformation of 50-90%. The annealing temperature is 760-800℃, and the time is 1-5 hours; And / or, the solution treatment temperature is 800-950℃, and the time is 0.5-3h; And / or, the low-temperature aging temperature is 240-450℃, and the time is 3-10h; And / or, the high-temperature aging temperature is 500-580℃, and the time is 2-8h.

[0015] The present invention also provides an application of the projectile-resistant titanium alloy sheet as described above or the projectile-resistant titanium alloy sheet prepared by the projectile-resistant titanium alloy sheet preparation method as described above, characterized in that the titanium alloy sheet is used in the preparation of components for helicopter protection, light armor for armored vehicles, surface ships, deep-sea submarines, and light armor or helmets for civilian vehicles.

[0016] The present invention provides a titanium alloy sheet resistant to projectile impact, its preparation method, and its application. The beneficial effects include at least the following: 1. The titanium alloy plate for resisting projectile impact provided by the present invention can quantitatively set the reflection coefficient of the titanium alloy plate for resisting projectile impact based on the impedance ratio and thickness ratio of high strength and energy-absorbing titanium alloy material, so as to realize the controllable unloading of incident stress, and reduce peak stress, suppress interlaminar cracking and reduce BFS by the plastic energy absorption of the back plate.

[0017] 2. The preparation method of the titanium alloy plate for resisting projectile impact provided by the present invention is highly compatible with the existing VAR / EB / PCHM melting-forging-rolling-STA / annealing, TMP / near β processing and layered composite process in terms of process steps and process parameter range. It can be directly embedded into production without the need for disruptive modification of existing production lines, and has cost-friendly and scalable feasibility.

[0018] 3. This invention improves equipment protection performance and reduces weight by approximately 20% through the composite of high-strength and energy-absorbing titanium alloy materials. (The composite material's resistance to projectile impact is enhanced; for the same projectile impact strength, the composite plate thickness can be thinner; and the use of titanium alloy also contributes to the lightweight composite plate.) This improves the power-to-weight ratio, enhancing vehicle mobility and battlefield response speed. Its excellent corrosion resistance and low-temperature toughness ensure high reliability in cold regions, mountainous terrain, and complex combat environments. Furthermore, it is applicable to track covers, boom connection structures, and vehicle body load-bearing components of lightweight equipment. The material's high toughness and good weldability ensure the structural safety and reliability of this equipment under complex operating conditions, high vibration, and impact loads, improving overall battlefield support capabilities. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1This is a schematic diagram of a projectile impact test provided in Application Example 1 of the present invention; Figure 2 This is a schematic diagram of a projectile impact test provided in Application Example 2 of the present invention; Figure 3 This is a schematic diagram of the ballistic impact test provided in Application Example 3 of the present invention; Figure 4 This is a schematic diagram of the ballistic impact test provided in Application Example 4 of the present invention. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions in the embodiments of this invention will be clearly and completely described below in conjunction with the embodiments of this invention. Those skilled in the art should understand that the embodiments described are merely illustrative of the invention and should not be considered as specific limitations thereof. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention. Process parameters not specifically specified in the following embodiments are generally performed under conventional conditions.

[0022] The endpoints and any values ​​of the ranges disclosed in this invention are not limited to the precise ranges or values, and these ranges or values ​​should be understood to include values ​​close to these ranges or values. For numerical ranges, the endpoint values ​​of the various ranges, the endpoint values ​​of the various ranges and individual point values, and individual point values ​​can be combined with each other to obtain one or more new numerical ranges, which should be considered as specifically disclosed in this invention.

[0023] According to a first aspect of the present invention, a titanium alloy plate resistant to projectile impact is provided, which is formed by hot rolling and heat treatment of at least one high-strength titanium alloy substrate and at least one energy-absorbing titanium alloy substrate, wherein the high-strength titanium alloy substrate and the energy-absorbing titanium alloy substrate are alternately stacked; the outermost high-strength titanium alloy substrate is the projectile impact surface of the titanium alloy plate resistant to projectile impact. The thickness ratio of two adjacent high-strength titanium alloy substrates and energy-absorbing titanium alloy substrates is 1:(1-20), such as 1:2, 1:3, 1:4, 1:5, 1:6, 1:7, 1:8, 1:10, 1:12, 1:14, 1:16, 1:18, etc., preferably 1:3; The impedance ratio of two adjacent high-strength titanium alloy substrates and energy-absorbing titanium alloy substrates is (1.025-1.25):1, such as 1.05:1, 1.08:1, 1.1:1, 1.15:1, 1.2:1, 1.23:1, etc., preferably 1.13:1.

[0024] Specifically, billets of different thicknesses have different "durations" and "degrees" of blocking and absorbing energy from shock waves. By rationally allocating the thickness of billets with different properties, the thickness ratio of two adjacent high-strength titanium alloy substrates and energy-absorbing titanium alloy substrates can be kept within the range of 1:(1-20). This ensures that the billet first impacted (the high-strength titanium alloy substrate) effectively blocks the projectile, while subsequent billets (the energy-absorbing titanium alloy substrate or back plate) fully absorb the remaining impact energy. Given a fixed total thickness of the titanium alloy sheet, if the high-strength titanium alloy substrate is relatively too thin... (For example, if the thickness ratio of two adjacent high-strength titanium alloy substrates to energy-absorbing titanium alloy substrates is 1:25), the initial impact resistance will be insufficient when subjected to projectile impact, and the projectile may quickly penetrate it, failing to effectively resist the projectile. If the energy-absorbing titanium alloy substrate is relatively thin (for example, if the thickness ratio of two adjacent high-strength titanium alloy substrates to energy-absorbing titanium alloy substrates is 2:1), the subsequent energy absorption capacity will be very poor after the high-strength titanium alloy substrate resists the projectile, which may lead to the overall damage of the plate and failure to effectively absorb the impact energy of the projectile.

[0025] Specifically, by limiting the impedance ratio of two adjacent high-strength titanium alloy substrates and energy-absorbing titanium alloy substrates to (1.025-1.25):1, this invention can reduce the deformation difference between the two substrates under impact, making the deformation of the two substrates more coordinated under impact, which helps to absorb energy more evenly, prevents the failure of a single substrate due to overload, and also improves the overall impact resistance by balancing the impedance difference between the two substrates to jointly absorb and disperse impact energy. If the impedance ratio of the two substrates is less than 1.025:1 (e.g., 0.9:1), the high-strength titanium alloy substrate cannot exert its due rigidity advantage, the initial impact load dispersion effect is weakened, the overall impact resistance and energy absorption performance of the structure are poor, it is difficult to achieve the ideal protection effect, and the interlayer is prone to cracking.

[0026] In summary, both impedance ratio and thickness ratio affect the ability of each substrate layer to absorb shock wave energy. The synergistic effect of the two can achieve efficient energy distribution and absorption. By reasonably limiting the impedance ratio and thickness ratio of two adjacent high-strength titanium alloy substrates and energy-absorbing titanium alloy substrates, this invention enables the titanium alloy plate to effectively block the projectile when it is impacted by the projectile, and to absorb the remaining energy to the maximum extent, thereby significantly improving its impact resistance performance.

[0027] In one optional embodiment of the present invention, the impedance of the high-strength titanium alloy substrate is (2.15~3.05)×10. 7 Pa·s / m, for example 2.2×10 7 Pa·s / m, 2.3×10 7 Pa·s / m, 2.4×10 7 Pa·s / m, 2.5×10 7 Pa·s / m, 2.6×107 Pa·s / m, 2.7×10 7 Pa·s / m, 2.8×10 7 Pa·s / m, 2.9×10 7 Pa·s / m, 3.0×10 7 Pa·s / m, etc.; The impedance of the energy-absorbing titanium alloy substrate is (2.01~2.85)×10. 7 Pa·s / m, for example 2.05×10 7 Pa·s / m, 2.10×10 7 Pa·s / m, 2.15×10 7 Pa·s / m, 2.20×10 7 Pa·s / m, 2.25×10 7 Pa·s / m, 2.30×10 7 Pa·s / m, 2.35×10 7 Pa·s / m, 2.40×10 7 Pa·s / m, 2.45×10 7 Pa·s / m, 2.50×10 7 Pa·s / m, 2.55×10 7 Pa·s / m, 2.60×10 7 Pa·s / m, 2.65×10 7 Pa·s / m, 2.70×10 7 Pa·s / m, 2.75×10 7 Pa·s / m, 2.80×10 7 Pa·s / m, etc.; The thickness of the high-strength titanium alloy substrate after hot rolling composite is 1-10 mm, such as 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, etc. The thickness of the energy-absorbing titanium alloy substrate after hot rolling composite is 1-50mm, such as 5mm, 10mm, 15mm, 20mm, 25mm, 28mm, 30mm, 35mm, 40mm, 45mm, etc. The absolute value of the reflection coefficient of the titanium alloy plate resistant to projectile impact is 0.05-0.2, such as 0.1, 0.12, 0.14, 0.16, 0.18, etc.

[0028] Specifically, by limiting the impedance values ​​of the energy-absorbing titanium alloy substrate and the high-strength titanium alloy substrate, the present invention can control the reflection coefficient of the titanium alloy plate that is resistant to projectile impact. This allows the incident compression wave to generate appropriate stretching reflection at the interface, effectively unloading the load, while allowing the transmitted wave to enter the energy-absorbing titanium alloy substrate for subsequent energy absorption.

[0029] Furthermore, this invention utilizes "interfacial shock wave response" as a design criterion: the transmission of shock waves in the composite plate is determined by the interlayer characteristic impedance Z = ρc ≈ √Eρ, where Z represents the characteristic impedance; ρ is the density of the material; c is the propagation speed of sound waves in the material; and E is the elastic modulus of the material. A high-impedance, high-strength titanium alloy substrate is placed on the impact surface for initial energy dissipation and to flatten or disintegrate the warhead; subsequently, a low-impedance energy-absorbing titanium alloy substrate is used as a backplate for absorbing subsequent kinetic energy. Due to the interfacial impedance difference, the incident compression wave undergoes tensile reflection at the high → low impedance interface, resulting in controllable unloading of the impact surface and reducing local peak stress; simultaneously, the transmitted wave enters the energy-absorbing titanium alloy substrate, where its yield-plastic energy dissipation and extended deformation absorb residual kinetic energy and suppress back bulging (BFS).

[0030] Furthermore, this invention utilizes a high-impedance surface (i.e., a high-strength titanium alloy substrate) and a low-impedance surface (i.e., an energy-absorbing titanium alloy substrate) as the back plate. The reflected wave formed by the impedance difference acts as an unloading agent. The ratio of the reflected wave to the incident wave (reflection coefficient) is calculated using the formula: Reflection coefficient = (Z-back - Z-surface) / (Z-surface + Z-back). This invention limits the impedance difference formed by the high-strength titanium alloy substrate and the energy-absorbing titanium alloy substrate to ensure that the reflection coefficient of the prepared projectile-resistant titanium alloy sheet is between 0.05 and 0.2, exhibiting excellent impact resistance. If the reflection coefficient of the projectile-resistant titanium alloy sheet is below 0.05, the impedance difference is approximately negligible, and the effect is similar to that of a single-layer plate. If the reflection coefficient is above 0.2, although the unloading capacity is strong, the interface requirements are too high, increasing the risk of interface delamination.

[0031] As an optional embodiment of the present invention, both the high-strength titanium alloy substrate and the energy-absorbing titanium alloy substrate, by mass percentage, comprise the following components: Al: 2.0-7.0% (e.g., 3%, 4%, 5%, 6%, etc.), V: 0-10% (e.g., 2%, 4%, 5%, 8%, etc.), Mo: 0-5.5% (e.g., 1%, 2%, 3%, 4%, 5%, etc.), Cr: 0-3.0% (e.g., 1%, 1.5%, 2%, 2.5%, etc.), Zr+Nb: 0-4.5% (e.g., 1%, 2%, 3%, 4%, etc.), Sn: 0.0-2.2% (e.g., 1%, 1.5%, 2%, etc.), Fe: 0.1-3.0% (e.g., 0.5%, 1%, 1.5%, 2%, 1.5%, etc.), Mn+Ni: 0-1.0% (e.g., 0.3%, 0.5%, 0.7%). The alloying elements are as follows: Si: 0-0.5% (e.g., 0.1%, 0.3%, 0.4%, etc.), O: 0.05-0.20% (e.g., 0.1%, 0.13%, 0.15%, 0.17%, etc.), B: 0-0.1% (0.3%, 0.5%, 0.7%, etc.), C: 0.03-0.12% (e.g., 0.05%, 0.07%, 0.1%, etc.), RE: ≤0.1%, impurity elements N≤0.05%, H≤0.015%, and the remainder is Ti and other uncontrollable residual elements. The control range of alloying elements is selected within the above range based on the performance requirements of the two materials.

[0032] As an optional embodiment of the present invention, the high-strength titanium alloy substrate includes one of TC11, TA15, Ti6242-Si, Ti5553, Ti-1023, Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe-C, Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe-B / C, and TC4-M1; Specifically, Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe-B / C includes: Al 3.5%, V 6%, Fe 0.5%, Cr 3.0%, Mo 5.0%, Sn 1.8-2.2%, C + B 0.15%, with the remainder being Ti and uncontrollable residual elements; Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe-C, specifically comprising: Al 3.5%, Mo 5%, V 6%, Cr 3%, Sn 2%, Fe 0.5%, C 0.15%, with the remainder being Ti and uncontrollable residual elements; TC4-M1 (M1=Fe / Ni+Nb) specifically includes: Al 5.5-6.75%, V 3.5-4.5%, Fe / Ni≤1.5%, Nb≤1.0%, O≤0.20%, C≤0.08%, N≤0.05%, H≤0.015%, with the remainder being Ti and other uncontrollable residual elements.

[0033] As an optional embodiment of the present invention, the energy-absorbing titanium alloy substrate includes one of TC4, TA15, ATI425, Timetal62s, and TC4-M2.

[0034] Specifically, TC4-M2 (M2=Fe / Ni) includes: Al 5.5-6.75%, V 3.5-4.5%, Fe / Ni≤1.5%, O≤0.20%, C≤0.08%, N≤0.05%, H≤0.015%, with the remainder being Ti and other uncontrollable residual elements.

[0035] As an optional embodiment of the present invention, the thickness of the titanium alloy plate for resisting ballistic impact is 2 to 120 mm (e.g., 5 mm, 10 mm, 20 mm, 30 mm, 40 mm, 50 mm, 80 mm, 100 mm, 110 mm, etc.).

[0036] As an optional embodiment of the present invention, the high-strength titanium alloy substrate has a yield strength of 1000-1300MPa (e.g., 1100MPa, 1150MPa, 1200MPa, 1250MPa, etc.), a tensile strength of 1100-1600MPa (e.g., 1200MPa, 1300MPa, 1400MPa, 1500MPa, etc.), an elongation of 6-15% (e.g., 7%, 10%, 13%, etc.), and an impact energy of over 14J at -40℃. The energy-absorbing titanium alloy substrate has a yield strength of 850-1100MPa (e.g., 900MPa, 950MPa, 1000MPa, etc.), a tensile strength of 980-1300MPa (e.g., 1000MPa, 1100MPa, 1200MPa, etc.), an elongation of 10-18% (e.g., 13%, 15%, 17%, etc.), and an impact energy of over 14J at -40℃. The titanium alloy plate used for projectile impact resistance has a yield strength of 850–1300 MPa (e.g., 900 MPa, 1100 MPa, 1150 MPa, 1200 MPa, 1250 MPa, etc.), a tensile strength of 980–1600 MPa (e.g., 1000 MPa, 1300 MPa, 1500 MPa, etc.), an elongation of 6–18% (e.g., 7%, 10%, 13%, 15%, 17%, etc.), and an impact energy of over 14 J at -40℃.

[0037] As an optional embodiment of the present invention, the surface bonding rate of the two adjacent hot-rolled composite high-strength titanium alloy substrates and the hot-rolled composite energy-absorbing titanium alloy substrates in the ballistic impact resistant titanium alloy sheet is 100%.

[0038] According to a second aspect of the present invention, a method for preparing a titanium alloy sheet resistant to projectile impact is provided, comprising the following steps: S1: At least one high-strength titanium alloy substrate and at least one energy-absorbing titanium alloy substrate are alternately stacked and then hot-rolled to obtain a hot-rolled composite titanium alloy sheet. S2: The hot-rolled composite titanium alloy sheet is subjected to a combination of annealing and solution aging treatment to obtain a titanium alloy sheet resistant to projectile impact.

[0039] As an optional embodiment of the present invention, the combined solution aging treatment is a solution treatment and a high-temperature aging treatment. or, Solution treatment, low-temperature aging, and high-temperature aging treatment.

[0040] Specifically, when the application scenario mainly requires high strength and operation in a high-temperature environment, solution treatment and high-temperature aging are adopted. This is because high-temperature aging can form stable strengthening phases (such as α phase or intermetallic compound phase) in titanium alloys. These strengthening phases are not easily decomposed at high temperatures, which can ensure that the plate still has sufficient strength to resist the impact of projectiles at high temperatures.

[0041] If titanium alloy plates are used in protective applications with extremely high requirements for comprehensive mechanical properties, solution treatment, low-temperature aging, and high-temperature aging are employed. During low-temperature aging, fine strengthening phases (such as fine α phases generated by the decomposition of metastable β phase) precipitate in the titanium alloy, rapidly increasing its strength. Subsequent high-temperature aging adjusts the morphology and distribution of these strengthening phases, improving toughness and making the plate both hard and tough.

[0042] As an optional embodiment of the present invention, the hot rolling includes: an initial rolling temperature of 920-1050℃ (e.g., 950℃, 1000℃, etc.), a final rolling temperature of 800-900℃ (e.g., 830℃, 850℃, 870℃, etc.), and a deformation amount of 50-90% (e.g., 60%, 70%, 80%, 85%, etc.).

[0043] As an optional embodiment of the present invention, the annealing temperature is 760-800℃ (e.g., 770℃, 780℃, 790℃, etc.), and the time is 1-5h (e.g., 2h, 3h, 4h, etc.). The solution treatment temperature is 800-950℃ (e.g., 850℃, 900℃, 920℃, etc.), and the time is 0.5-3h (e.g., 1h, 2h, 2.5h, etc.). The low-temperature aging temperature is 240-450℃ (e.g., 300℃, 350℃, 400℃, etc.), and the time is 3-10h (e.g., 4h, 6h, 7h, 8h, etc.). The high-temperature aging temperature is 500-580℃ (e.g., 520℃, 540℃, 560℃, etc.), and the time is 2-8h (e.g., 4h, 5h, 7h, etc.).

[0044] According to a third aspect of the present invention, an application of a titanium alloy sheet material resistant to projectile impact as described above is provided, the titanium alloy sheet material being used in the manufacture of components for helicopter protection, light armor for light combat vehicles, surface ships, deep-sea submarines, and light armor or helmets for civilian vehicles.

[0045] The present invention will now be described in further detail with reference to specific embodiments and comparative examples.

[0046] Example 1 This embodiment provides a titanium alloy plate resistant to projectile impact, which is formed by hot rolling and heat treatment of a high-strength titanium alloy substrate and an energy-absorbing titanium alloy substrate. The high-strength titanium alloy substrate and the energy-absorbing titanium alloy substrate are alternately stacked. The high-strength titanium alloy substrate is the projectile impact-bearing surface of the titanium alloy plate resistant to projectile impact. The thickness ratio of the high-strength titanium alloy substrate to the energy-absorbing titanium alloy substrate is 1:3; The impedance ratio of the high-strength titanium alloy substrate and the energy-absorbing titanium alloy substrate is 1.13:1; The impedance of the high-strength titanium alloy substrate is 2.60 × 10⁻⁶. 7 Pa·s / m; The impedance of the energy-absorbing titanium alloy substrate is 2.30 × 10⁻⁶. 7 Pa·s / m; The reflectivity of the titanium alloy plate used to resist projectile impact is 0.061.

[0047] The high-strength titanium alloy substrate (i.e., TC11) comprises the following components by mass percentage: Al 5.5-7.0%, Fe≤0.25%, Mo 2.8-3.8%, Zr0.8-2.0%, Si 0.2-0.35%, O≤0.015%, C≤0.08%, N≤0.05%, H≤0.012%, with the remainder being Ti and other uncontrollable residual elements. Its yield strength is 1000MPa, elongation is 10%, tensile strength is 1450MPa, and impact energy at -40℃ is ≥28J.

[0048] The energy-absorbing titanium alloy substrate (TC4) comprises the following components by mass percentage: Al 5.5-6.75%, V 3.5-4.5%, Fe≤0.40%, O≤0.20%, C≤0.08%, N≤0.05%, H≤0.015%, with the remainder being Ti and other uncontrollable residual elements. Its yield strength is 950 MPa, elongation is 10%, tensile strength is 1250 MPa, and impact energy at -40℃ is ≥18 J.

[0049] The titanium alloy plate with ballistic impact resistance provided in this embodiment has a total thickness of 8mm.

[0050] The surface bonding rate of the hot-rolled composite high-strength titanium alloy substrate and the hot-rolled composite energy-absorbing titanium alloy substrate in the titanium alloy sheet resistant to projectile impact is 100%.

[0051] This embodiment also provides a method for preparing a titanium alloy plate resistant to projectile impact, comprising the following steps: S1: Stack a high-strength titanium alloy substrate and an energy-absorbing titanium alloy substrate, and then hot roll them to obtain a hot-rolled composite titanium alloy sheet. The initial rolling temperature for hot rolling is 920℃ and the final rolling temperature is 830℃, with a deformation of 60%. S2: The hot-rolled composite titanium alloy sheet is subjected to a combination of annealing and solution aging treatment to obtain a titanium alloy sheet resistant to projectile impact. The annealing temperature was 780℃ and the annealing time was 1 hour. The solution treatment and aging process involves solution treatment and high-temperature aging treatment. The solution treatment temperature is 890℃ and the time is 0.5h, while the high-temperature aging temperature is 550℃ and the time is 3h.

[0052] Application Example 1 The projectile impact resistant titanium alloy sheet prepared in Example 1 was used for projectile impact resistance testing, such as... Figure 1 As shown: The impact-resistant titanium alloy substrate of the titanium alloy plate prepared in Example 1 was shot at a test distance of 100 m using a 7.62mm steel core bullet (Type 54). Test results: It can withstand the impact of a 7.62mm steel-core bullet (Type 54) without penetration. The impacted surface forms a dent, the back side does not bulge, and there is no crack at the interface between the two substrates.

[0053] Example 2 This embodiment provides a titanium alloy plate resistant to projectile impact, which is formed by hot rolling and heat treatment of two high-strength titanium alloy substrates of the same thickness and one energy-absorbing titanium alloy substrate. The high-strength titanium alloy substrate and the energy-absorbing titanium alloy substrate are alternately stacked; the outermost high-strength titanium alloy substrate is the projectile impact surface of the titanium alloy plate resistant to projectile impact. The thickness ratio of two adjacent high-strength titanium alloy substrates and energy-absorbing titanium alloy substrates is 1:6; The impedance ratio of two adjacent high-strength titanium alloy substrates and energy-absorbing titanium alloy substrates is 1.17:1; The impedance of the high-strength titanium alloy substrate is 2.70 × 10⁻⁶. 7 Pa·s / m; The impedance of the energy-absorbing titanium alloy substrate is 2.30 × 10⁻⁶. 7 Pa·s / m; The reflectivity of the titanium alloy plate used to resist projectile impact is 0.08.

[0054] The high-strength titanium alloy substrate (TA15) comprises the following components by mass percentage: Al 2.0-3.5%, V 0.8-2.5%, Fe≤0.25%, Mo 0.5-2.0%, Zr 1.5-2.5%, Si≤0.15%, O≤0.12%, C≤0.08%, N≤0.05%, H≤0.015%, with the remainder being Ti and other uncontrollable residual elements. Its yield strength is 1025 MPa, elongation is 13%, tensile strength is 1230 MPa, and impact energy at -40℃ is ≥14 J.

[0055] The energy-absorbing titanium alloy substrate (TC4) comprises the following components by mass percentage: Al 5.5-6.75%, V 3.5-4.5%, Fe≤0.40%, O≤0.20%, C≤0.08%, N≤0.05%, H≤0.015%, with the remainder being Ti and other uncontrollable residual elements. Its yield strength is 950 MPa, elongation is 10%, tensile strength is 1250 MPa, and impact energy at -40℃ is ≥18 J.

[0056] The titanium alloy plate with ballistic impact resistance provided in this embodiment has a total thickness of 8mm.

[0057] The surface bonding rate of the adjacent hot-rolled composite high-strength titanium alloy substrate and the hot-rolled composite energy-absorbing titanium alloy substrate in the ballistic impact resistant titanium alloy plate is 100%.

[0058] This embodiment also provides a method for preparing a titanium alloy plate resistant to projectile impact, comprising the following steps: S1: Two high-strength titanium alloy substrates of the same thickness and one energy-absorbing titanium alloy substrate are alternately stacked and then hot-rolled to obtain a hot-rolled composite titanium alloy sheet. The initial rolling temperature of the hot rolling process was 920℃ and the final rolling temperature was 830℃, with a deformation rate of 71%. S2: The hot-rolled composite titanium alloy sheet is subjected to a combination of annealing and solution aging treatment to obtain a titanium alloy sheet resistant to projectile impact. The annealing temperature was 770℃ and the annealing time was 1.5h. The solution treatment and aging process involves solution treatment and high-temperature aging treatment. The solution treatment temperature is 850℃ for 1 hour, and the high-temperature aging temperature is 550℃ for 4 hours.

[0059] Application Example 2 The projectile impact resistant titanium alloy sheet prepared in Example 2 was used for projectile impact resistance testing, such as... Figure 2 As shown: The impact-resistant titanium alloy substrate of the titanium alloy plate prepared in Example 2 was fired at a test distance of 100m using a 7.62mm armor-piercing incendiary projectile. Test results: It can withstand the impact of a 7.62mm armor-piercing incendiary round without penetration. The impacted surface only has slight dents, the back side has no bulges, and there is no crack at the interface between the two substrates.

[0060] Example 3 This embodiment provides a titanium alloy plate resistant to projectile impact, which is formed by hot rolling and heat treatment of two high-strength titanium alloy substrates of the same thickness and two energy-absorbing titanium alloy substrates of the same thickness. The high-strength titanium alloy substrates and the energy-absorbing titanium alloy substrates are alternately stacked. The outermost high-strength titanium alloy substrate is the projectile impact surface of the titanium alloy plate resistant to projectile impact. The thickness ratio of two adjacent high-strength titanium alloy substrates and energy-absorbing titanium alloy substrates is 1:6. The impedance ratio of two adjacent high-strength titanium alloy substrates and energy-absorbing titanium alloy substrates is 1.17:1; The impedance of the high-strength titanium alloy substrate is 2.70 × 10⁻⁶. 7 Pa·s / m; The impedance of the energy-absorbing titanium alloy substrate is 2.30 × 10⁻⁶. 7 Pa·s / m; The reflectivity of the titanium alloy plate used to resist projectile impact is 0.08.

[0061] The high-strength titanium alloy substrate (i.e., Ti6242-Si) comprises the following components by mass percentage: Al 5.5-6.5%, V 3.5-4.5%, Fe≤0.25%, Mo 1.8-2.2%, Sn 1.8-2.2%, O≤0.15%, C≤0.05%, N≤0.05%, H≤0.0125%, with the remainder being Ti and other uncontrollable residual elements. Its yield strength is 1050 MPa, elongation is 10%, tensile strength is 1250 MPa, and impact energy at -40℃ is ≥15 J.

[0062] The energy-absorbing titanium alloy substrate (TC4) comprises the following components by mass percentage: Al 5.5-6.75%, V 3.5-4.5%, Fe≤0.40%, O≤0.20%, C≤0.08%, N≤0.05%, H≤0.015%, with the remainder being Ti and other uncontrollable residual elements. Its yield strength is 950 MPa, elongation is 10%, tensile strength is 1250 MPa, and impact energy at -40℃ is ≥18 J.

[0063] The total thickness of the ballistic impact-resistant titanium alloy plate provided in this embodiment is 14mm; The surface bonding rate of the adjacent hot-rolled composite high-strength titanium alloy substrate and the hot-rolled composite energy-absorbing titanium alloy substrate in the ballistic impact resistant titanium alloy plate is 100%.

[0064] This embodiment also provides a method for preparing a titanium alloy plate resistant to projectile impact, comprising the following steps: S1: Two high-strength titanium alloy substrates of the same thickness and two energy-absorbing titanium alloy substrates of the same thickness are alternately stacked and then hot-rolled to obtain hot-rolled composite titanium alloy sheet. The initial rolling temperature for hot rolling is 980℃ and the final rolling temperature is 850℃, with a deformation of 64%. S2: The hot-rolled composite titanium alloy sheet is subjected to a combination of annealing and solution aging treatment to obtain a titanium alloy sheet resistant to projectile impact. The annealing temperature was 770℃ and the annealing time was 2 hours. The solution treatment and aging process involves solution treatment and high-temperature aging treatment. The solution treatment temperature is 850℃ and the time is 1.5h, while the high-temperature aging temperature is 550℃ and the time is 5h.

[0065] Application Example 3 The projectile impact resistant titanium alloy sheet prepared in Example 3 was used for projectile impact resistance testing, such as... Figure 3 As shown: The impact-resistant titanium alloy substrate of the titanium alloy plate prepared in Example 3 was fired at a test distance of 100m using a 12.7mm armor-piercing incendiary projectile. Test results: It can withstand the impact of a 12.7mm armor-piercing incendiary round without penetration. The impacted surface has a very shallow indentation, and the back side has no obvious deformation or bulging. There is no crack at the interface between the two substrates.

[0066] Example 4 This embodiment provides a titanium alloy plate resistant to projectile impact, which is formed by hot rolling and heat treatment of four high-strength titanium alloy substrates of the same thickness and four energy-absorbing titanium alloy substrates of the same thickness. The high-strength titanium alloy substrates and the energy-absorbing titanium alloy substrates are stacked alternately. The outermost high-strength titanium alloy substrate is the projectile impact surface of the titanium alloy plate resistant to projectile impact. The thickness ratio of two adjacent high-strength titanium alloy substrates and energy-absorbing titanium alloy substrates is 1:4; The impedance ratio of two adjacent high-strength titanium alloy substrates and energy-absorbing titanium alloy substrates is 1.11:1; The impedance of the high-strength titanium alloy substrate is 3.00 × 10⁻⁶. 7 Pa·s / m; The impedance of the energy-absorbing titanium alloy substrate is 2.70 × 10⁻⁶. 7 Pa·s / m; The reflectivity of the titanium alloy plate used to resist projectile impact is 0.053.

[0067] The high-strength titanium alloy substrate, by mass percentage, is Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe-C, specifically comprising: Al 3.5%, V 6%, Fe 0.5%, Cr 3.0%, Mo 5.0%, Sn 1.8-2.2%, C 0.15%, with the remainder being Ti and other uncontrollable residual elements. Its yield strength is 1206 MPa, elongation is 14%, tensile strength is 1500 MPa, and impact energy at -40℃ is ≥14 J.

[0068] The energy-absorbing titanium alloy substrate (TA15) comprises the following components by mass percentage: Al 2.0-3.5%, V 0.8-2.5%, Fe≤0.25%, Mo 0.5-2.0%, Zr 1.5-2.5%, Si≤0.15%, O≤0.12%, C≤0.08%, N≤0.05%, H≤0.015%, with the remainder being Ti and other uncontrollable residual elements. Its yield strength is 1115 MPa, elongation is 13%, tensile strength is 1400 MPa, and impact energy at -40℃ is ≥14 J.

[0069] The total thickness of the titanium alloy plate for ballistic impact resistance provided in this embodiment is 25mm.

[0070] The surface bonding rate of the adjacent hot-rolled composite high-strength titanium alloy substrate and the hot-rolled composite energy-absorbing titanium alloy substrate in the ballistic impact resistant titanium alloy plate is 100%.

[0071] This embodiment also provides a method for preparing a titanium alloy plate resistant to projectile impact, comprising the following steps: S1: Four high-strength titanium alloy substrates of the same thickness and four energy-absorbing titanium alloy substrates of the same thickness are alternately stacked and then hot-rolled to obtain hot-rolled composite titanium alloy sheet. The initial rolling temperature of the hot rolling process is 950℃ and the final rolling temperature is 850℃, with a deformation of 68%. S2: The hot-rolled composite titanium alloy sheet is subjected to a combination of annealing and solution aging treatment to obtain a titanium alloy sheet resistant to projectile impact. The annealing temperature was 770℃ and the annealing time was 2 hours. The solution aging combined treatment consists of solution aging, low-temperature aging, and high-temperature aging. The solution aging temperature is 850℃ for 1.5 hours; the low-temperature aging temperature is 350℃ for 3 hours; and the high-temperature aging temperature is 550℃ for 5 hours.

[0072] Application Example 4 The projectile impact resistant titanium alloy sheet prepared in Example 4 was used for projectile impact resistance tests, such as... Figure 4 As shown: The impact-resistant titanium alloy substrate of the titanium alloy plate prepared in Example 4 was tested by firing a PG87 25mm tracer armor-piercing incendiary projectile at a test distance of 100m. Test results: It can withstand the impact of a PG87 25mm tracer armor-piercing incendiary round without penetration. The impacted surface has a slight dent, and there is no obvious bulge on the back. There is no crack at the interface between the two substrates.

[0073] Example 5 This embodiment provides a titanium alloy plate resistant to projectile impact, which is formed by hot rolling and heat treatment of four high-strength titanium alloy substrates of the same thickness and four energy-absorbing titanium alloy substrates of the same thickness. The high-strength titanium alloy substrates and the energy-absorbing titanium alloy substrates are stacked alternately. The outermost high-strength titanium alloy substrate is the projectile impact surface of the titanium alloy plate resistant to projectile impact. The thickness ratio of two adjacent high-strength titanium alloy substrates and energy-absorbing titanium alloy substrates is 1:4; The impedance ratio of two adjacent high-strength titanium alloy substrates and energy-absorbing titanium alloy substrates is 1.15:1; The impedance of the high-strength titanium alloy substrate is 3.05 × 10⁻⁶. 7 Pa·s / m; The impedance of the energy-absorbing titanium alloy substrate is 2.65 × 10⁻⁶.7 Pa·s / m; The reflectivity of the titanium alloy plate used to resist projectile impact is 0.070.

[0074] The high-strength titanium alloy substrate, by mass percentage, is Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe-B+C, specifically comprising: Al 3.5%, V 6%, Fe 0.5%, Cr 3.0%, Mo 5.0%, Sn 1.8-2.2%, C+B 0.15%, with the remainder being Ti and other uncontrollable residual elements. Its yield strength is 1300 MPa, elongation is 14%, tensile strength is 1450 MPa, and impact energy at -40℃ is ≥14 J.

[0075] The energy-absorbing titanium alloy substrate (i.e., ATI425) comprises the following components by mass percentage: Al 3.5-4.5%, V 2.0-3.0%, Fe 1.2-1.8%, O 0.20-0.30%, C≤0.08%, N≤0.03%, H≤0.015%, with the remainder being Ti and other uncontrollable residual elements. Its yield strength is 950 MPa, elongation is 13%, tensile strength is 1050 MPa, and impact energy at -40℃ is ≥14 J.

[0076] The total thickness of the ballistic impact-resistant titanium alloy plate provided in this embodiment is 40mm. The surface bonding rate of the adjacent hot-rolled composite high-strength titanium alloy substrate and the hot-rolled composite energy-absorbing titanium alloy substrate in the ballistic impact resistant titanium alloy plate is 100%.

[0077] This embodiment also provides a method for preparing a titanium alloy plate resistant to projectile impact, comprising the following steps: S1: Four high-strength titanium alloy substrates of the same thickness and four energy-absorbing titanium alloy substrates of the same thickness are alternately stacked and then hot-rolled to obtain hot-rolled composite titanium alloy sheet. The initial rolling temperature for hot rolling is 950℃ and the final rolling temperature is 850℃, with a deformation rate of 75%. S2: The hot-rolled composite titanium alloy sheet is subjected to a combination of annealing and solution aging treatment to obtain a titanium alloy sheet resistant to projectile impact. The annealing temperature was 780℃ and the annealing time was 3 hours. The solution aging combined treatment consists of solution aging, low-temperature aging, and high-temperature aging. The solution aging temperature is 850℃ for 2 hours; the low-temperature aging temperature is 350℃ for 4 hours; and the high-temperature aging temperature is 550℃ for 6 hours.

[0078] Application Example 5 The projectile impact resistant titanium alloy sheet prepared in Example 5 was used for projectile impact resistance testing: The impact-resistant titanium alloy substrate of the titanium alloy plate prepared in Example 5 was subjected to a test at a distance of 100 m using a 30mm high-explosive aerial shell. Test results: It can withstand the impact of a 30mm high-explosive aerial bomb without penetration. The impacted surface has only a very shallow indentation, and there is almost no visible deformation or bulge on the back. There is no crack at the interface between the two substrates.

[0079] Example 6 This embodiment provides a titanium alloy plate resistant to projectile impact, which is formed by hot rolling and heat treatment of four high-strength titanium alloy substrates of the same thickness and four energy-absorbing titanium alloy substrates of the same thickness. The high-strength titanium alloy substrates and the energy-absorbing titanium alloy substrates are stacked alternately. The outermost high-strength titanium alloy substrate is the projectile impact surface of the titanium alloy plate resistant to projectile impact. The thickness ratio of two adjacent high-strength titanium alloy substrates and energy-absorbing titanium alloy substrates is 1:3; The impedance ratio of two adjacent high-strength titanium alloy substrates and energy-absorbing titanium alloy substrates is 1.17:1; The impedance of the high-strength titanium alloy substrate is 2.80 × 10⁻⁶. 7 Pa·s / m; The impedance of the energy-absorbing titanium alloy substrate is 2.40 × 10⁻⁶. 7 Pa·s / m; The reflectivity of the titanium alloy plate used to resist projectile impact is 0.077.

[0080] The high-strength titanium alloy substrate (i.e., Ti5553) comprises the following components by mass percentage: Al 4.5-5.5%, V 4.5-5.5%, Fe≤0.25%, Cr 3.0%, Mo 4.5-5.5%, C≤0.08%, N≤0.05%, H≤0.012%, with the remainder being Ti and other uncontrollable residual elements. Its yield strength is 1100MPa, elongation is 12%, tensile strength is 1250MPa, and impact energy at -40℃ is ≥18J.

[0081] By mass percentage, the energy-absorbing titanium alloy substrate (i.e., Timetal62s) comprises the following components: Al 5.5-6.5%, Fe 1.8-2.2%, Si 0.07-0.13%, with the remainder being Ti and other uncontrollable residual elements. Its yield strength is 930 MPa, elongation is 10%, tensile strength is 1050 MPa, and impact energy at -40℃ is ≥24 J.

[0082] The total thickness of the titanium alloy plate for ballistic impact resistance provided in this embodiment is 64mm.

[0083] The surface bonding rate of the adjacent hot-rolled composite high-strength titanium alloy substrate and the hot-rolled composite energy-absorbing titanium alloy substrate in the ballistic impact resistant titanium alloy plate is 100%.

[0084] This embodiment also provides a method for preparing a titanium alloy plate resistant to projectile impact, comprising the following steps: S1: Four high-strength titanium alloy substrates of the same thickness and four energy-absorbing titanium alloy substrates of the same thickness are alternately stacked and then hot-rolled to obtain hot-rolled composite titanium alloy sheet. The initial rolling temperature for hot rolling is 950℃ and the final rolling temperature is 800℃, with a deformation of 68%. S2: The hot-rolled composite titanium alloy sheet is subjected to a combination of annealing and solution aging treatment to obtain a titanium alloy sheet resistant to projectile impact. The annealing temperature was 780℃, and the annealing time was 4 hours. The solution aging combined treatment consists of solution aging, low-temperature aging, and high-temperature aging. The solution aging temperature is 850℃ for 3 hours; the low-temperature aging temperature is 350℃ for 6 hours; and the high-temperature aging temperature is 550℃ for 8 hours.

[0085] Application Example 6 The projectile impact resistance test was conducted using the titanium alloy plate prepared in Example 6 that is resistant to projectile impact. The impact-resistant titanium alloy substrate of the titanium alloy plate prepared in Example 6 was fired at a test distance of 100m using a 30mm armor-piercing projectile; Test results: It can withstand the impact of a 30mm armor-piercing bullet without penetration. The impacted surface has only slight dents, and there is no obvious bulge on the back. There is no crack at the interface between the two substrates.

[0086] Example 7 The main difference between this embodiment and Embodiment 1 is that the thickness ratio of the high-strength titanium alloy substrate and the energy-absorbing titanium alloy substrate is 1:2, while the remaining steps and technical parameters are the same as in Embodiment 1.

[0087] Application Example 7 The projectile impact resistant titanium alloy sheet prepared in Example 7 was used for projectile impact resistance tests: The impact-resistant titanium alloy substrate of the titanium alloy plate prepared in Example 7 was fired at a test distance of 100 m using a 7.62mm steel core bullet (Type 54). Test results: It can withstand the impact of a 7.62mm steel core bullet (Type 54) without penetration. The dent formed on the impact surface is larger than that in Example 1. There is no bulging on the back side and no cracking at the interface between the two substrates.

[0088] Example 8 The main difference between this embodiment and Embodiment 1 is that the thickness ratio of the high-strength titanium alloy substrate and the energy-absorbing titanium alloy substrate is 1:4, while the remaining steps and technical parameters are the same as in Embodiment 1.

[0089] Application Example 8 The projectile impact resistant titanium alloy sheet prepared in Example 8 was used for projectile impact resistance testing: The impact-resistant titanium alloy substrate of the titanium alloy plate prepared in Example 8 was shot at a test distance of 100 m using a 7.62mm steel core bullet (Type 54). Test results: It can withstand the impact of a 7.62mm steel core bullet (Type 54) without penetration. The dent formed on the impact surface is larger than that in Example 1. There is no bulging on the back side and no cracking at the interface between the two substrates.

[0090] Example 9 The main difference between this embodiment and Embodiment 1 is that the impedance ratio of two adjacent high-strength titanium alloy substrates and energy-absorbing titanium alloy substrates is 1.17:1. The impedance of the high-strength titanium alloy substrate is 2.70 × 10⁻⁶. 7 Pa·s / m; The impedance of the energy-absorbing titanium alloy substrate is 2.30 × 10⁻⁶. 7 Pa·s / m; The reflectivity of the titanium alloy plate used to resist projectile impact is 0.08.

[0091] The high-strength titanium alloy substrate (TA15) comprises the following components by mass percentage: Al 2.0-3.5%, V 0.8-2.5%, Fe≤0.25%, Mo 0.5-2.0%, Zr 1.5-2.5%, Si≤0.15%, O≤0.12%, C≤0.08%, N≤0.05%, H≤0.015%, with the remainder being Ti and other uncontrollable residual elements. Its yield strength is 1115 MPa, elongation is 13%, tensile strength is 1400 MPa, and impact energy at -40℃ is ≥14 J.

[0092] The energy-absorbing titanium alloy substrate (TC4) comprises the following components by mass percentage: Al 5.5-6.75%, V 3.5-4.5%, Fe≤0.40%, O≤0.20%, C≤0.08%, N≤0.05%, H≤0.015%, with the remainder being Ti and other uncontrollable residual elements. Its yield strength is 950 MPa, elongation is 10%, tensile strength is 1250 MPa, and impact energy at -40℃ is ≥18 J.

[0093] The remaining steps and technical parameters are the same as in Example 1.

[0094] Application Example 9 The projectile impact resistant titanium alloy sheet prepared in Example 9 was used for projectile impact resistance testing: The impact-resistant titanium alloy substrate of the titanium alloy plate prepared in Example 9 was tested by firing a 7.62mm steel-core bullet (Type 54) at a test distance of 100 m. Test results: It can withstand the impact of a 7.62mm steel core bullet (Type 54) without penetration. The dent formed on the impact surface is larger than that in Example 1. There is no bulging on the back side and no cracking at the interface between the two substrates.

[0095] Example 10 The main difference between this embodiment and Embodiment 1 is that the impedance ratio of two adjacent high-strength titanium alloy substrates and energy-absorbing titanium alloy substrates is 1.11:1; The impedance of the high-strength titanium alloy substrate is 3.00 × 10⁻⁶. 7 Pa·s / m; The impedance of the energy-absorbing titanium alloy substrate is 2.70 × 10⁻⁶. 7 Pa·s / m; The reflectivity of the titanium alloy plate used to resist projectile impact is 0.053.

[0096] The high-strength titanium alloy substrate, by mass percentage, is Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe-C, specifically comprising: Al 3.5%, V 6%, Fe 0.5%, Cr 3.0%, Mo 5.0%, Sn 1.8-2.2%, C 0.15%, with the remainder being Ti and other uncontrollable residual elements. Its yield strength is 1206 MPa, elongation is 14%, tensile strength is 1500 MPa, and impact energy at -40℃ is ≥14 J.

[0097] The energy-absorbing titanium alloy substrate (TA15) comprises the following components by mass percentage: Al 2.0-3.5%, V 0.8-2.5%, Fe≤0.25%, Mo 0.5-2.0%, Zr 1.5-2.5%, Si≤0.15%, O≤0.12%, C≤0.08%, N≤0.05%, H≤0.015%, with the remainder being Ti and other uncontrollable residual elements. Its yield strength is 1025 MPa, elongation is 13%, tensile strength is 1230 MPa, and impact energy at -40℃ is ≥14 J.

[0098] The remaining steps and technical parameters are the same as in Example 1.

[0099] Application Example 10 The projectile impact resistant titanium alloy sheet prepared in Example 10 was used for projectile impact resistance tests: The impact-resistant titanium alloy substrate of the titanium alloy plate prepared in Example 10 was fired at a test distance of 100 m using a 7.62mm steel core bullet (Type 54). Test results: It can withstand the impact of a 7.62mm steel core bullet (Type 54) without penetration. The dent formed on the impact surface is larger than that in Example 1. There is no bulging on the back side and no cracking at the interface between the two substrates.

[0100] Comparative Example 1 The difference between this comparative example and Example 1 is that the thickness ratio of the high-strength titanium alloy substrate and the energy-absorbing titanium alloy substrate is 1:25, while the remaining steps and performance parameters are the same as in Example 1.

[0101] The titanium alloy sheet prepared in Comparative Example 1, which is resistant to projectile impact, was subjected to a projectile impact test: The impact-resistant titanium alloy substrate of the titanium alloy plate prepared in Comparative Example 1 was shot at a test distance of 100 m using a 7.62mm steel core bullet (Type 54). Test results: It could not withstand the impact of a 7.62mm steel core bullet (Type 54). The impact surface cracked, the interface between the two substrates cracked, and the back side bulged.

[0102] Compared with Example 1, Comparative Example 1 has a thickness ratio of 1:25 between the high-strength titanium alloy substrate and the energy-absorbing titanium alloy substrate. The high-strength titanium alloy substrate is relatively too thin, and its initial impact resistance will be insufficient when subjected to projectile impact. Therefore, the titanium alloy plate prepared in Comparative Example 1 is damaged as a whole and cannot resist the impact of the projectile.

[0103] Comparative Example 2 The difference between this comparative example and Example 1 is that the thickness ratio of the high-strength titanium alloy substrate to the energy-absorbing titanium alloy substrate is 2:1, while the remaining steps and performance parameters are the same as in Example 1.

[0104] The titanium alloy plate prepared in Comparative Example 2, which is resistant to projectile impact, was subjected to a projectile impact test: The impact-resistant titanium alloy substrate of the titanium alloy plate prepared in Comparative Example 2 was shot at a test distance of 100 m with a 7.62mm steel core bullet (Type 54). Test results: It could not withstand the impact of a 7.62mm steel core bullet (Type 54). The interface between the two substrates cracked, a pit was formed on the impacted surface, and a bulge appeared on the back.

[0105] Compared with Example 1, Comparative Example 2 has a thickness ratio of 2:1 between the high-strength titanium alloy substrate and the energy-absorbing titanium alloy substrate. The energy-absorbing titanium alloy substrate is relatively too thin. After the high-strength titanium alloy substrate resists the projectile, its subsequent energy absorption capacity will be very poor. Therefore, the titanium alloy plate prepared in Comparative Example 2 suffers interlayer damage and cracking and cannot resist the impact of the projectile.

[0106] Comparative Example 3 The difference between this comparative example and Example 1 is that the impedance ratio of the high-strength titanium alloy substrate and the energy-absorbing titanium alloy substrate is 0.96:1, while the remaining steps and performance parameters are the same as in Example 1. The impedance of the high-strength titanium alloy substrate is 2.30 × 10⁻⁶. 7 Pa·s / m; The impedance of the energy-absorbing titanium alloy substrate is 2.40 × 10⁻⁶. 7 Pa·s / m; The reflectivity of the titanium alloy plate used to resist projectile impact is 0.021. The high-strength titanium alloy substrate comprises the following components by weight percentage: Al 3.0-4.0%, V 4.5-5.5%, Fe≤0.30%, O≤0.12%, C≤0.08%, N≤0.05%, H≤0.015%, with the remainder being Ti and other uncontrollable residual elements. Its yield strength is 920MPa, elongation is 12%, tensile strength is 1000MPa, and impact energy at -40℃ is ≥20J. By mass percentage, the energy-absorbing titanium alloy substrate (i.e., Timetal62s) comprises the following components: Al 5.5-6.5%, Fe 1.8-2.2%, Si 0.07-0.13%, with the remainder being Ti and other uncontrollable residual elements. Its yield strength is 930 MPa, elongation is 10%, tensile strength is 1050 MPa, and impact energy at -40℃ is ≥24 J.

[0107] The titanium alloy plate prepared in Comparative Example 3, which is resistant to projectile impact, was subjected to a projectile impact test: The impact-resistant titanium alloy substrate of the titanium alloy plate prepared in Comparative Example 3 was shot at a test distance of 100 m with a 7.62mm steel core bullet (Type 54). Test results: It could not withstand the impact of a 7.62mm steel core bullet (Type 54). The impact surface cracked, the interface between the two substrates cracked, and the back side bulged.

[0108] Because the impedance ratio of the high-strength titanium alloy substrate and the titanium alloy substrate in Comparative Example 3 is 0.96:1, the high-strength titanium alloy substrate dents and cracks after being impacted. The energy-absorbing titanium alloy substrate has a higher impedance and is less able to absorb residual impact force. Therefore, the titanium alloy plate prepared in Comparative Example 3 cracks on the impact surface during the projectile impact test, and cracks also occur at the interface between the two substrates. The titanium alloy plate is damaged as a whole and cannot resist the impact of the projectile.

[0109] Performance testing This invention uses GB / T 3621-2022 "Titanium and Titanium Alloy Plates", GB / T 229-2020 "Charpy Pendulum Impact Test Method for Metallic Materials", and GB / T 22315-2008 "Test Method for Elastic Modulus and Poisson's Ratio of Metallic Materials" to test the mechanical properties of titanium alloy plates resisting projectile impact.

[0110] Results data The mechanical properties of the projectile-resistant titanium alloy plates prepared in the examples and comparative examples are shown in Table 1: Table 1

[0111] As shown in Table 1, by reasonably limiting the impedance ratio and thickness ratio of two adjacent high-strength titanium alloy substrates and energy-absorbing titanium alloy substrates, the present invention enables the titanium alloy plate to effectively block the projectile and absorb the remaining energy to the maximum extent when subjected to projectile impact, thereby significantly improving its impact resistance performance.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A titanium alloy plate resistant to projectile impact, characterized in that, It is formed by hot rolling and heat treatment of at least one high-strength titanium alloy substrate and at least one energy-absorbing titanium alloy substrate, wherein the high-strength titanium alloy substrate and the energy-absorbing titanium alloy substrate are stacked alternately; the outermost high-strength titanium alloy substrate is the impact surface of the projectile in the titanium alloy plate that resists projectile impact. The thickness ratio of two adjacent high-strength titanium alloy substrates and energy-absorbing titanium alloy substrates is 1:(1-20). The impedance ratio of two adjacent high-strength titanium alloy substrates and energy-absorbing titanium alloy substrates is (1.025-1.25):

1.

2. The titanium alloy plate for resisting projectile impact according to claim 1, characterized in that, The impedance of the high-strength titanium alloy substrate is (2.15~3.05)×10. 7 Pa·s / m; And / or, the impedance of the energy-absorbing titanium alloy substrate is (2.01~2.85)×10 7 Pa·s / m; And / or, the thickness of the high-strength titanium alloy substrate after hot rolling composite is 1-10 mm; And / or, the thickness of the energy-absorbing titanium alloy substrate after hot rolling composite is 1-50 mm; And / or, the absolute value of the reflection coefficient of the titanium alloy plate resistant to ballistic impact is 0.05-0.

2.

3. The titanium alloy plate for resisting projectile impact according to claim 1, characterized in that, By mass percentage, both the high-strength titanium alloy substrate and the energy-absorbing titanium alloy substrate comprise the following components: Al: 2.0-7.0%, V: 0-10%, Mo: 0-5.5%, Cr: 0-3.0%, Zr+Nb: 0-4.5%, Sn: 0.0-2.2%, Fe: 0.1-3.0%, Mn+Ni: 0-1.0%, Si: 0-0.5%, O: 0.05-0.20%, B: 0-0.1%, C: 0.03-0.12%, RE: ≤0.1%, impurity elements N≤0.05%, H≤0.015%, and the remainder is Ti and other uncontrollable residual elements.

4. The titanium alloy plate for resisting projectile impact according to claim 1, characterized in that, The high-strength titanium alloy substrate includes one of TC11, TA15, Ti6242-Si, Ti5553, Ti-1023, Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe-C, Ti-3.5Al-5Mo-6V-3Cr-2Sn-0.5Fe-B / C, and TC4-M1; And / or, the energy-absorbing titanium alloy substrate includes one of: TC4, TA15, ATI425, Timetal62s, and TC4-M2.

5. The titanium alloy plate for resisting projectile impact according to claim 1, characterized in that, The thickness of the titanium alloy plate used to resist projectile impact is 2–120 mm. And / or, the high-strength titanium alloy substrate has a yield strength of 1000-1300MPa, a tensile strength of 1100-1600MPa, an elongation of 6-15%, and an impact energy of over 14J at -40℃. And / or, the yield strength of the energy-absorbing titanium alloy substrate is 850-1100MPa, the tensile strength is 980-1300MPa, the elongation is 10-18%, and the impact energy at -40℃ reaches more than 14J. And / or, the yield strength of the titanium alloy plate resistant to ballistic impact is 850-1300 MPa, the tensile strength is 980-1600 MPa, the elongation is 6-18%, and the impact energy at -40℃ reaches more than 14 J.

6. The titanium alloy plate for resisting projectile impact according to claim 1, characterized in that, The surface bonding rate of the adjacent hot-rolled composite high-strength titanium alloy substrate and the hot-rolled composite energy-absorbing titanium alloy substrate in the ballistic impact resistant titanium alloy plate is 100%.

7. A method for preparing a titanium alloy sheet resistant to projectile impact as described in any one of claims 1-6, characterized in that, Includes the following steps: S1: At least one high-strength titanium alloy substrate and at least one energy-absorbing titanium alloy substrate are alternately stacked and then hot-rolled to obtain a hot-rolled composite titanium alloy sheet. S2: The hot-rolled composite titanium alloy sheet is subjected to a combination of annealing and solution aging treatment to obtain a titanium alloy sheet resistant to projectile impact.

8. The method for preparing a titanium alloy plate resistant to projectile impact according to claim 7, characterized in that, The combined solid solution and high-temperature aging treatment is a combination of solid solution and high-temperature aging treatment. Alternatively, solution treatment, low-temperature aging, and high-temperature aging treatment.

9. The method for preparing a titanium alloy plate resistant to projectile impact according to claim 8, characterized in that, The hot rolling conditions include: an initial rolling temperature of 920-1050℃, a final rolling temperature of 800-900℃, and a deformation of 50-90%. The annealing temperature is 760-800℃, and the time is 1-5 hours; And / or, the solution treatment temperature is 800-950℃, and the time is 0.5-3h; And / or, the low-temperature aging temperature is 240-450℃, and the time is 3-10h; And / or, the high-temperature aging temperature is 500-580℃, and the time is 2-8h.

10. The application of a projectile-impact-resistant titanium alloy sheet as described in any one of claims 1-6, or a projectile-impact-resistant titanium alloy sheet prepared by the method described in any one of claims 7-9, characterized in that... The titanium alloy sheet is used in the manufacture of lightweight armor or helmet components for helicopter protection, light armor for combat vehicles, surface ships, deep-sea submarines, and civilian vehicles.

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