Production process for preventing grain growth of titanium-steel composite plate

Abstract

The invention belongs to the technical field of titanium-steel composite plates, and particularly relates to a production process for preventing grain growth of a titanium-steel composite plate, which comprises the following steps: roughening the lower side surface of a titanium plate and the upper side surface of a steel plate by adopting a sand blasting process; an additive is sprayed to the upper side face of the steel plate and the lower side face of the titanium plate, the additive comprises boron powder and a binding agent, graphite foil is laid on the upper side face of the steel plate sprayed with the additive, the titanium plate sprayed with the additive is stacked on the steel plate, and the graphite foil is clamped by the upper side face of the steel plate and the lower side face of the titanium plate to prepare a composite plate blank; sealing the edge part of the composite plate blank by using a sealing material; the production process comprises the following steps: heating a composite plate blank through a heating furnace, rolling and cooling the heated composite plate blank, straightening the composite plate blank through a straightening machine, and trimming the straightened composite plate blank to obtain the titanium-steel composite plate. And the bonding strength and the shearing strength of the titanium steel composite plate are improved.

Description

Technical Field

[0001] The invention belongs to the technical field of titanium steel composite plates, and in particular relates to a production process for preventing the growth of titanium steel composite plate grains. Background Art

[0002] In modern industrial production, titanium-steel composite plates have excellent comprehensive properties, such as the corrosion resistance of titanium and the high strength of steel. Hot rolling process, as one of the commonly used methods for producing titanium-steel composite plates, has the advantages of high production efficiency and relatively low cost. For example, the invention patent with the authorized patent announcement number CN102794299B discloses a method for rolling titanium-steel composite plates, which includes selecting a titanium-steel composite plate with an upper layer of titanium plate and a lower layer of steel plate, cleaning the outer surface of the selected titanium-steel composite plate, coating a layer of anti-oxidation coating on the surface of the titanium plate as an anti-oxidation layer to obtain a pretreated titanium-steel composite plate, heating the pretreated titanium-steel composite plate and evenly heating it, rolling the evenly heated titanium-steel composite plate on a hot rolling mill, and using high-pressure water to descale and cool the titanium-steel composite plate during the rolling process.

[0003] However, in the production process of hot-rolled titanium-steel composite plates, interface problems have always been the key factor restricting their performance improvement and wide application. In particular, grain growth is prone to occur at the interface, which brings many adverse effects. The abnormal growth of grains at the interface will lead to a decrease in the interface bonding strength. In the subsequent use process, the interface of the composite plate is prone to defects such as delamination and cracking, which seriously affects the reliability and service life of the product. Moreover, the uneven grain structure will also cause the mechanical properties and corrosion resistance of the composite plate to be unevenly distributed, reducing the overall performance stability of the material. In addition, since the grain growth problem is difficult to effectively control, the product quality of the hot-rolled titanium-steel composite plate fluctuates greatly, which increases the scrap rate in the production process and increases the production cost. This is undoubtedly a difficult problem that needs to be solved urgently for the modern industry that pursues efficient and high-quality production. Therefore, how to inhibit the grain growth at the interface of hot-rolled titanium-steel composite plates and improve the interface quality and the comprehensive performance of the composite plates has become a research hotspot and a key technical issue in this field. Therefore, a new production process for preventing the grain growth of titanium-steel composite plates is urgently needed. Through interface modification, coordinated regulation of rolling process and other means, the coarsening of grains at the interface of titanium-steel composite plates can be inhibited and the comprehensive performance can be improved. Summary of the invention

[0004] In view of the above problems, the present invention proposes a production process for preventing grain growth of titanium-steel composite plates, which effectively solves the problem that the abnormal growth of grains at the interface of titanium-steel composite plates in the existing hot-rolled titanium-steel composite plate technology will lead to a decrease in interface bonding strength, and the grain growth problem is difficult to effectively control, resulting in large fluctuations in the product quality of titanium-steel composite plates.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A production process for preventing grain growth of titanium steel composite plates, comprising the following steps:

[0006] Step 1: Select a titanium plate with an upper layer thickness of 0.5-5mm and a steel plate with a lower layer thickness of 3-20mm;

[0007] Step 2: Place the titanium plate and the steel plate in step 1 into a cleaning tank containing a degreasing agent and then use a high-pressure water gun to clean them;

[0008] Step 3: roughening the lower side of the titanium plate and the upper side of the steel plate by sandblasting;

[0009] Step 4: spraying additives on the upper side of the steel plate and the lower side of the titanium plate, wherein the additives include boron powder and a binder;

[0010] Step 5: Lay graphite foil on the side of the steel plate sprayed with additives in step 4, and stack the titanium plate sprayed with additives in step 4 on the steel plate, so that the upper side of the steel plate and the lower side of the titanium plate sandwich the graphite foil to form a composite plate blank;

[0011] Step 6: sealing the edge of the composite plate blank with a sealing material;

[0012] Step 7: heating the composite plate blank in a heating furnace, wherein the heating temperature of the composite plate blank is 700° C.-950° C.;

[0013] Step 8, rolling the heated composite plate blank, the rolling passes are at least three, the first rolling pass has a reduction rate of 10%-20%, the subsequent rolling passes have a reduction rate that gradually decreases, the penultimate rolling pass has a reduction rate of 7%-10%, and the last rolling pass has a reduction rate of 5%-7%, the first rolling speed is 0.5-1m / s, the subsequent rolling speeds gradually increase, and the maximum rolling speed is less than 2m / s;

[0014] Step nine, cooling the rolled composite plate blank, straightening the composite plate blank by a straightening machine, and trimming the straightened composite plate blank to obtain a titanium steel composite plate.

[0015] Furthermore, the roughness of the upper side surface of the steel plate and the upper side surface of the titanium plate subjected to the three roughening treatments in the above steps is 6.3-25 μm.

[0016] Furthermore, the amount of boron powder added in the additive is 0.01%-0.1% of the total mass of the titanium plate and the steel plate.

[0017] Furthermore, the binder is a nickel-based binder.

[0018] Furthermore, the mass ratio of the boron powder to the nickel-based binder is 1:5.

[0019] Furthermore, in step 4, the purity of the graphite foil is greater than 99%, and the thickness of the graphite foil is 0.1-0.3 mm.

[0020] Furthermore, the sealing material is a ceramic fiber sealing tape.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] After the bonding surface of the titanium plate and the steel plate is cleaned and sandblasted, a protective layer is formed on the bonding surface by spraying an additive to prevent the bonding strength from being reduced due to oxidation of the bonding surface of the titanium plate and the steel plate. At the same time, the boron powder in the additive can refine the grains and inhibit the grain growth of titanium and steel during heating and rolling, thereby improving the microstructure and performance of the composite plate.

[0023] At the same time, the present invention lays a graphite foil with a purity of more than 99% and a thickness of 0.1-0.3 mm between the steel plate and the titanium plate. On the one hand, it can prevent excessive reaction of titanium and steel due to direct contact at high temperature. On the other hand, it can play a role of buffering and lubrication during the rolling process, which is conducive to better combining the titanium plate and the steel plate. Compared with the more precise temperature control method, it avoids the generation of grains on the bonding surface of the titanium plate and the steel plate, making the interface reaction more uniform and controllable.

[0024] In addition, during the heating process, the nickel-based binder can undergo a certain degree of diffusion reaction with titanium and steel. Nickel atoms will diffuse into the matrix of titanium and steel, and some elements in titanium and steel will also diffuse into the nickel-based binder. This diffusion will form a region with a gradual transition of components at the interface, thus forming a metallurgical bonding effect, thereby increasing the strength of the bonding surface. DETAILED DESCRIPTION

[0025] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] A production process for preventing grain growth of titanium steel composite plates, comprising the following steps:

[0027] Step 1: Select a titanium plate with an upper layer thickness of 0.5-5 mm, the titanium plate can be one of TA1, TA2, TC4, TC6, TC10, and select a steel plate with a lower layer thickness of 3-20 mm, the steel plate can be one of Q235, Q345, 302, 304, 304L steel.

[0028] Step 2: Put the titanium plate and steel plate in step 1 into a cleaning tank containing a degreaser for cleaning. The temperature of the degreaser in the cleaning tank is controlled at 40-60°C. The soaking time is 15-30 minutes. Then use a high-pressure water gun for cleaning. The water pressure is controlled at 5-10Mpa.

[0029] Step 3: Use sandblasting process to roughen the lower side of titanium plate and the upper side of steel plate. Use corundum sand with particle size of 40-60 mesh for sandblasting. The roughness of the upper side of steel plate and the upper side of titanium plate is 6.3-25μm. The treated titanium plate and steel plate are transferred to a clean environment.

[0030] Step 4: spray additives on the upper side of the steel plate and the lower side of the titanium plate, and form a protective layer through the sprayed additives to prevent the bonding strength of the titanium plate and the steel plate from being reduced due to oxidation. The additives include boron powder and a binder. The binder is preferably a nickel-based binder. During the heating process, the nickel-based binder can undergo a certain degree of diffusion reaction with titanium and steel. Nickel atoms will diffuse into the matrix of titanium and steel, and some elements in titanium and steel will also diffuse into the nickel-based binder. This diffusion will form a region with a gradual transition of components at the interface, thereby forming a metallurgical bonding effect, thereby increasing the strength of the bonding surface. The mass ratio of the boron powder to the nickel-based binder is 1:5, and the amount of boron powder added in the additive is 0.01%-0.1% of the total mass of the titanium plate and the steel plate. The binder is attached to the surface of the steel plate and the titanium plate after the roughening treatment by cold spraying.

[0031] Step 5: Lay graphite foil on the side of the steel plate after spraying the additive in step 4. First, check the appearance of the graphite foil to ensure that the surface is flat, without wrinkles, damage and obvious impurity particles.

[0032] Check whether the thickness of the graphite foil meets the requirements. The thickness should be between 0.1-0.3mm. You can use a micrometer to measure multiple points at different positions of the graphite foil. At least 9 points per square meter should be measured according to a 3×3 grid distribution to ensure that the thickness deviation is within ±0.02mm. Cut the graphite foil into a size slightly larger than the titanium plate and the steel plate. This can ensure that the graphite foil can completely cover the bonding surface of the titanium plate and the steel plate, and there is a certain margin for subsequent adjustments. Starting from the center of the graphite foil, use a soft rubber scraper or a special smoothing tool to gently smooth the graphite foil toward the edge so that the graphite foil fits tightly with the surface of the titanium plate. During the smoothing process, pay attention to keeping the angle between the scraper or tool and the surface of the graphite foil at 30°-45°, and apply uniform pressure. The pressure is controlled at 0.1-0.2MPa to avoid scratching the graphite foil or causing local deformation of the graphite foil. Stack the titanium plate sprayed with additives in step 4 on the steel plate, ensuring that the steel plates are stacked on top of each other. The position is accurate, and the deviation is controlled within ±0.5mm. The upper side of the steel plate and the lower side of the titanium plate clamp the graphite foil, and the excess graphite foil at the edge of the steel plate and the titanium plate is cut off to form a composite plate blank. Under the high temperature and high pressure conditions of heating and rolling, the titanium atoms and iron atoms have enough energy to diffuse. Through the thermal motion of atoms, the activity of titanium atoms and iron atoms is enhanced, and they can overcome certain resistance, achieve mutual approach and diffusion, and thus form a certain degree of metallurgical bonding at the interface. The graphite foil mainly slows down the reaction rate between titanium and steel to prevent them from excessively combining at high temperatures, rather than completely preventing the reaction. It provides a relatively controllable environment for atomic diffusion, making the composite process more stable and uniform. At the same time, because the graphite foil is a brittle material, it is squeezed and broken during the rolling process, and a uniform bonding area is formed after each rolling pass. The lubricating effect of the graphite foil also helps to make the titanium plate and the steel plate fit better during the rolling process, increasing the opportunity for interaction between atoms.

[0033] Step 6: Use sealing material to seal the edge of the composite board blank. The sealing material is a ceramic fiber sealing tape, which is wound in multiple layers to seal the edge of the composite board blank.

[0034] Step 7. Heat the composite board blank in a heating furnace. The heating furnace can be a gas-fired radiation tube heating furnace or an electric heating furnace. After placing the blank in the heating furnace, slowly heat it to 700-950°C at a heating rate of 5-15°C / min. During the heating process, the temperature control system in the furnace monitors and adjusts the temperature of each area in the furnace in real time to ensure that the blank is heated evenly and the temperature deviation is controlled within ±10°C. During the heating process, an appropriate amount of protective gas, such as nitrogen or argon, is introduced, and the flow rate of the protective gas is controlled at 5-10m 3 / h, so that the furnace maintains a slightly positive pressure state, reduces the entry of oxygen, reduces the risk of oxidation, and inhibits the abnormal growth of grains.

[0035] Step eight, rolling the heated composite plate blank, the rolling passes are at least three, the first rolling pass has a reduction rate of 10%-20%, the subsequent rolling passes have a reduction rate that gradually decreases, the penultimate pass has a reduction rate of 7%-10%, and the last pass has a reduction rate of 5%-7%. The first rolling speed is 0.5-1m / s, and the subsequent rolling speeds gradually increase, with a maximum rolling speed of less than 2m / s. In order to prevent the blank from heating up during the rolling process, spray cooling can be used to evenly spray water mist on the surface of the composite plate, and the water mist pressure is controlled at 0.2-0.4MPa. By accurately controlling the cooling time and the amount of cooling water, the temperature of the composite plate is kept within a suitable rolling temperature range, effectively inhibiting grain growth.

[0036] During the heating and rolling process, due to the presence of boron powder at the bonding interface of the composite plate blank, the boron atoms have a smaller atomic radius. During the rolling process of the titanium steel composite plate heated to 700℃-950℃, the boron atoms will dissolve in the matrix and tend to be segregated at the grain boundaries. Grain boundaries are areas in the crystal where atoms are irregularly arranged and have higher energy. The segregation of boron atoms at the grain boundaries is equivalent to setting up many tiny obstacles on the grain boundaries. When the grains try to grow through grain boundary migration, these segregated boron atoms will hinder the movement of the grain boundaries, which makes the migration of the grain boundaries difficult, thereby effectively inhibiting the growth of the grains, so that the grains need to overcome greater energy barriers during the growth process, thereby limiting the growth rate and size of the grains. The segregation of boron atoms at the grain boundaries will also change the energy state and interface characteristics of the grain boundaries. On the other hand, the presence of boron atoms reduces the surface energy of the grain boundary. Grain boundary energy is one of the important factors driving grain growth. The reduction of grain boundary energy means that the driving force of grain growth is reduced, thereby slowing down the growth rate of grains. At the same time, the segregation of boron atoms changes the electronic structure and atomic arrangement of the grain boundary, which increases the stability of the grain boundary. This increased stability further hinders the migration of the grain boundary, making it difficult for the grain to grow by moving the grain boundary. In addition, boron atoms may also form chemical bonds or special atomic clusters with other atoms near the grain boundary. These chemical bonds and atomic clusters will also affect the properties of the grain boundary, further enhancing the inhibitory effect on grain growth.

[0037] Step 9: Cool the rolled composite plate blank. For composite plates with a total thickness of less than 10 mm, air cooling can be used to cool in a natural environment, and the cooling rate is controlled at 10-20°C / min. For composite plates with a total thickness of more than 10 mm, air cooling is used, and the cooling rate is controlled at 15-30°C / min by a fan. The composite plate blank is straightened by a straightening machine, and the straightened composite plate blank is trimmed to obtain a titanium steel composite plate.

[0038] Three groups of embodiments and one group of comparative examples are compared below. The experimental data of the embodiments and comparative examples are obtained in accordance with the relevant requirements of GB / T8547-2019 "Titanium-Steel Composite Plate" and GB / T6396 "Test Methods for Mechanical and Process Properties of Composite Steel Plates".

[0039] Embodiment 1:

[0040] Material selection: Use TA2 titanium plate with an upper layer thickness of 1mm and 302 steel plate with a lower layer thickness of 5mm.

[0041] Additive spraying: the mass ratio of boron powder to nickel-based binder is 1:5, and the amount of boron powder added is 0.01% of the total mass of the titanium plate and the steel plate.

[0042] Heating of composite plate blank: put it into an electric heating furnace, raise the temperature to 800℃ at a rate of 10℃ / min, and introduce appropriate amount of argon gas for protection.

[0043] Rolling: Four rolling passes are carried out, the first rolling pass has a reduction rate of 12% and a speed of 0.6 m / s; the second rolling pass has a reduction rate of 10% and a speed of 1.1 m / s; the third rolling pass has a reduction rate of 8% and a speed of 1.3 m / s; the fourth rolling pass has a reduction rate of 6% and a speed of 1.6 m / s.

[0044] Example 1 Experimental data:

[0045] Bonding strength: 155MPa, in line with the bonding strength requirement of GB / T8547-2019 of ≥140MPa.

[0046] Shear strength: 183MPa, in line with relevant tests of GB / T6396 standard.

[0047] Tensile strength: It meets the requirements of the corresponding standards for 302 steel composite plates. There is no obvious deformation or separation at the junction of the titanium layer and the steel layer, which meets the relevant tests of the GB / T6396 standard.

[0048] Bending test: When the bending radius is 2 times the plate thickness, there are no cracks, delamination or other defects in the bending part of the specimen, which meets the GB / T8547-2019 standard.

[0049] Embodiment 2:

[0050] Material selection: TC6 titanium plate with an upper layer thickness of 3mm and Q345 steel plate with a lower layer thickness of 12mm.

[0051] Additive spraying: The amount of boron powder added is 0.05% of the total mass, and the mass ratio of boron powder to nickel-based binder remains 1:5.

[0052] Composite plate blank heating: adopt gas radiation tube heating furnace, raise the temperature to 900℃ at the speed of 12℃ / min, and introduce nitrogen protection.

[0053] Rolling: Five passes are carried out, the first pass has a reduction rate of 16% and a speed of 0.8 m / s; the second pass has a reduction rate of 13% and a speed of 1.2 m / s; the third pass has a reduction rate of 10% and a speed of 1.4 m / s; the fourth pass has a reduction rate of 8% and a speed of 1.5 m / s; the fifth pass has a reduction rate of 6% and a speed of 1.7 m / s.

[0054] Example 2 Experimental data:

[0055] Bonding strength: 168MPa, in line with the bonding strength requirement of GB / T8547-2019 of ≥140MPa.

[0056] Shear strength: 193MPa, in line with relevant tests of GB / T6396 standard.

[0057] Tensile strength: Meets the standard requirements of Q345 steel composite plate, titanium and steel are well combined, and meets the relevant tests of GB / T6396 standard.

[0058] Bending test: When the bending radius is 2 times the plate thickness, the specimen has no defects such as cracks and delamination, meeting the GB / T8547-2019 standard.

[0059] Embodiment three:

[0060] Material selection: TC10 titanium plate with an upper thickness of 4mm and 304L steel plate with a lower thickness of 18mm.

[0061] Additive spraying: The amount of boron powder added is 0.1% of the total mass, and the mass ratio of boron powder to nickel-based binder is 1:5.

[0062] Heating of composite plate blank: put it into an electric heating furnace, raise the temperature to 920℃ at a rate of 15℃ / min, and pass argon gas for protection.

[0063] Rolling: Four passes of rolling are carried out, the first pass has a reduction rate of 18% and a speed of 0.9 m / s; the second pass has a reduction rate of 14% and a speed of 1.3 m / s; the third pass has a reduction rate of 11% and a speed of 1.5 m / s; the fourth pass has a reduction rate of 7% and a speed of 1.8 m / s.

[0064] Example 3 Experimental data:

[0065] Bonding strength: 162MPa, in line with the bonding strength requirement of GB / T8547-2019 of ≥140MPa.

[0066] Shear strength: 188MPa, in line with relevant tests of GB / T6396 standard.

[0067] Tensile strength: Conforms to 304L steel composite plate standards, titanium steel interface is stable, and conforms to relevant tests of GB / T6396 standards.

[0068] Bending test: When the bending radius is 2 times the plate thickness, the specimen has no defects such as cracks and delamination, meeting the GB / T8547-2019 standard.

[0069] Comparative Example:

[0070] Material selection: Use TA2 titanium plate with an upper layer thickness of 1mm and 302 steel plate with a lower layer thickness of 5mm.

[0071] Additive spraying: No boron powder-containing additives were sprayed, and no nickel-based binder and graphite foil were used.

[0072] Rolling: The rolling passes and reduction rate are the same as those in Example 1.

[0073] Experimental data:

[0074] Bonding strength: 125MPa, lower than the 140MPa required by GB / T8547-2019.

[0075] Shear strength: 150 MPa, lower than the data in the embodiment.

[0076] Tensile strength: Although it meets the basic requirements of 302 steel, there are obvious signs of deformation at the titanium-steel joint, which does not meet the requirements for good bonding in the GB / T6396 standard.

[0077] Bending test: When the bending radius is 2 times the plate thickness, obvious cracks and delamination appear on the specimen, which does not meet the GB / T8547-2019 standard.

[0078] It can be obtained from the experimental data of Example 1, Example 2 and Example 3 that the bonding strength, shear strength, etc. of titanium steel composite plates obtained by spraying boron powder and nickel-based binder and using graphite foil on various types of titanium plates and steel plates using the process for preventing and controlling grain growth of titanium steel composite plates described in the present invention are higher than the national standard data, and meet the good quality requirements of composite plates.

[0079] By comparing Example 1 with Example 2 and Example 3, it can be obtained from the experimental data that appropriately increasing the amount of boron powder added within the range of the amount of boron powder added, or using multiple rolling passes, can effectively improve the bonding strength and shear strength.

[0080] By comparing Example 1, Example 2, and Example 3 with Comparative Example 1, it can be found that the process for preventing and controlling grain growth of titanium-steel composite plates proposed in the present invention can effectively improve structural strength and shear strength, and is superior to traditional titanium-steel composite plate rolling process methods in tensile strength and bending tests.

[0081] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A production process for preventing grain growth of titanium steel composite plates, characterized in that: The following steps are involved: Step 1: Select a titanium plate with an upper layer thickness of 0.5-5mm and a steel plate with a lower layer thickness of 3-20mm; Step 2: Place the titanium plate and the steel plate in step 1 into a cleaning tank containing a degreasing agent and then use a high-pressure water gun to clean them; Step 3: roughening the lower side of the titanium plate and the upper side of the steel plate by sandblasting; Step 4: spraying additives on the upper side of the steel plate and the lower side of the titanium plate, wherein the additives include boron powder and a binder; Step 5: Lay graphite foil on the side of the steel plate sprayed with additives in step 4, and stack the titanium plate sprayed with additives in step 4 on the steel plate, so that the upper side of the steel plate and the lower side of the titanium plate sandwich the graphite foil to form a composite plate blank; Step 6: sealing the edge of the composite plate blank with a sealing material; Step 7: heating the composite plate blank in a heating furnace, wherein the heating temperature of the composite plate blank is 700° C.-950° C.; Step 8, rolling the heated composite plate blank, the rolling passes are at least three, the first rolling pass has a reduction rate of 10%-20%, the subsequent rolling passes have a reduction rate that gradually decreases, the penultimate rolling pass has a reduction rate of 7%-10%, and the last rolling pass has a reduction rate of 5%-7%, the first rolling speed is 0.5-1m / s, the subsequent rolling speeds gradually increase, and the maximum rolling speed is less than 2m / s; Step nine, cooling the rolled composite plate blank, straightening the composite plate blank by a straightening machine, and trimming the straightened composite plate blank to obtain a titanium steel composite plate.

2. The production process for preventing grain growth of titanium-steel composite plates according to claim 1, characterized in that: The roughness of the upper side surface of the steel plate and the side surface of the titanium plate subjected to the three roughening treatments in the steps is 6.3-25 μm.

3. The production process for preventing grain growth of titanium-steel composite plates according to claim 1 is characterized in that: The amount of boron powder added in the additive is 0.01%-0.1% of the total mass of the titanium plate and the steel plate.

4. The production process for preventing grain growth of titanium-steel composite plates according to claim 1 is characterized in that: The bonding agent is a nickel-based bonding agent.

5. The production process for preventing grain growth of titanium-steel composite plates according to claim 4 is characterized in that: The mass ratio of the boron powder to the nickel-based binder is 1:

5.

6. The production process for preventing grain growth of titanium-steel composite plates according to claim 1 is characterized in that: In the step 4, the purity of the graphite foil is greater than 99%, and the thickness of the graphite foil is 0.1-0.3 mm.

7. The production process for preventing grain growth of titanium-steel composite plates according to claim 1 is characterized in that: The sealing material is a ceramic fiber sealing tape.