Process optimization method and system for improving superplastic forming limit of titanium hydride alloy plate

Abstract

The invention belongs to the field of heat treatment and hot working of titanium alloy materials, and particularly discloses a process optimization method and system for improving the superplastic forming limit of a titanium hydride alloy plate. According to the method, the stress state in the superplastic forming process and the staged cooling process are regulated and controlled, and the problem that the mechanical property of the titanium hydride alloy is degraded due to local enrichment of hydrogen elements in superplastic deformation is solved. The method comprises the following specific steps: hydrotreating a titanium alloy plate to improve plasticity; a superplastic constitutive equation is established through a uniaxial tensile experiment, and loading air pressure is optimized; applying an air pressure difference between the upper die and the lower die in the superplastic bulging to form a multi-axial stress state so as to uniformly diffuse hydrogen; and after forming, sectional cooling (slow cooling and rapid cooling) is adopted for efficient dehydrogenation. The method effectively relieves the hydrogen enrichment phenomenon, improves the forming limit, reduces the subsequent vacuum annealing step, has the advantages of being stable in process, energy-saving and efficient, and is suitable for manufacturing complex thin-wall components in the aerospace field.

Description

Technical Field

[0001] The invention belongs to the field of heat treatment and heat processing of titanium alloy materials, and in particular relates to a method for improving the forming limit of a hydrogenated titanium alloy plate during a superplastic process. Background Art

[0002] Superplastic forming is currently recognized as one of the advanced forming technologies for manufacturing thin-walled complex integral structures. This technology has great advantages in reducing the weight of aircraft structures and reducing production costs, and is hailed as a pioneering technology in modern aerospace industry production. Like other hot working processes, this process inevitably grows and coarsens the microstructure of titanium alloys under high temperature, long-term heat treatment and thermal deformation conditions, resulting in material properties of the formed parts being inferior to those of the parent material. Based on the phenomenon that the performance of structural parts of titanium alloys deteriorates after superplastic forming, hydrogen can be infiltrated into the titanium alloy through a hydrogenation process to improve the mechanical properties of the hydrogenated titanium alloy after forming. Hydrogen, as a temporary alloying element, can significantly reduce the flow stress of titanium alloys, improve plasticity, and restore material properties through recrystallization during subsequent vacuum annealing and dehydrogenation.

[0003] Uniaxial tension is the best method for achieving superplastic mechanical properties in metal materials. During superplastic uniaxial tension, a large number of dislocations are generated, and dislocations are an effective migration pathway for hydrogen diffusion. The uneven diffusion of hydrogen in titanium hydride alloys leads to high concentrations of hydrogen entangled at the dislocations, which manifests as hydrogen enrichment in localized areas on the tensile specimen. This localized hydrogen enrichment causes a β-phase hardening effect and an interface weakening effect, promoting crack initiation, thereby affecting the material's fracture behavior and potentially significantly reducing its elongation. Summary of the Invention

[0004] The purpose of the present invention is to improve the superplastic forming process of titanium hydride alloy. By increasing the stress state, not only can the superplastic deformation be uniform, but the hydrogen enrichment characteristics can also be greatly alleviated, and ultimately the forming limit of titanium hydride alloy can be improved.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a process optimization method for improving the superplastic forming limit of a hydrogenated titanium alloy plate, the process optimization method comprising the following steps:

[0007] Step S1: After treating and cleaning the surface of the titanium alloy plate, high-purity hydrogen is introduced into the plate in a vacuum hydrogen furnace at 600-800° C. for 30 minutes to 2 hours, and the hydrogen pressure is controlled to obtain a target hydrogenation amount;

[0008] Step S2: determining the optimal superplastic temperature and true stress-true strain curve of titanium alloys with different hydrogen contents through uniaxial high-temperature tensile tests, and establishing a superplastic constitutive equation;

[0009] Step S3, performing finite element simulation based on the superplastic constitutive equation to obtain the optimal superplastic forming loading pressure required for bulging;

[0010] Step S4: spraying a boron nitride release agent on the surface of the hydrogenated plate, placing it in a superplastic forming mold, heating it to 700-900° C. and keeping it warm;

[0011] Step S5: Based on the optimal superplastic forming loading pressure, the pressure difference between the upper and lower molds is adjusted to form a multi-axial stress state on both sides of the sheet material, thereby suppressing the local enrichment of hydrogen elements;

[0012] Step S6: After forming, a staged cooling process is adopted: slow cooling from the optimal superplastic temperature to 550°C for dehydrogenation, and rapid cooling below 550°C.

[0013] Furthermore, the vacuum degree of the vacuum hydrogen furnace needs to be pumped to 5×10 -3 Pa, the hydrogen pressure range is 10mbar~0.1MPa.

[0014] Furthermore, the temperature of 700-900° C. in the above step S4 is the optimal superplastic forming temperature for hydrogen-containing materials, and the holding time is 5-10 minutes.

[0015] Furthermore, the above step S5 is specifically as follows:

[0016] According to the optimal superplastic forming loading pressure, high-purity argon gas is introduced into the air paths of the upper and lower molds, so that different air pressures are applied on both sides of the sheet. By adjusting the air pressure of the upper and lower molds, a pressure difference is formed on both sides of the sheet. Finally, by adjusting the pressure difference, the stress distribution state of the sheet during the superplastic process is changed, thereby suppressing the local enrichment of hydrogen elements.

[0017] Furthermore, the pressure difference of the high-purity argon gas is in the range of 0.1 to 2 MPa.

[0018] Furthermore, the rate of the segmented cooling in the above step S6 is controlled as follows: slow cooling at 1°C / min above 600°C, and fast cooling at ≥5°C / min below 550°C.

[0019] Furthermore, no additional vacuum annealing treatment is required after the above segmented cooling.

[0020] The process optimization for improving the superplastic forming limit of a hydrided titanium alloy plate described in the present invention can be embedded in a storage device of a computer. Therefore, the present invention also provides a process optimization system for improving the superplastic forming limit of a hydrided titanium alloy plate. The system includes a storage device, which is used to execute the above-mentioned process optimization method and steps for improving the superplastic forming limit of a hydrided titanium alloy plate.

[0021] Furthermore, the present invention also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, executes any one of the above-mentioned process optimization methods for improving the superplastic forming limit of a hydride titanium alloy sheet.

[0022] Furthermore, the present invention also provides a computer device, which includes a memory and a processor, wherein a computer program is stored in the memory. When the processor runs the computer program stored in the memory, the processor executes any one of the above-mentioned process optimization methods for improving the superplastic forming limit of hydrogenated titanium alloy plates.

[0023] The beneficial effects of the present invention are:

[0024] The present invention proposes a process optimization method for improving the superplastic forming limit of hydrogenated titanium alloy plates. This method is a method for alleviating the deterioration of the mechanical properties of the material caused by hydrogen enrichment during superplastic forming of hydrogenated titanium alloys. The present invention provides a multi-axial stress state, stabilizes the superplastic forming process, and reduces the excessive accumulation of hydrogen elements as dislocations in large deformation zones multiply, thereby achieving not only uniform superplastic deformation but also improving the forming limit of the hydrogenated titanium alloy.

[0025] Furthermore, the present invention removes hydrogen by cooling the titanium hydride alloy in stages after superplastic forming, thereby eliminating the need for subsequent vacuum annealing of the component. This method can save time and energy.

[0026] Furthermore, the present invention innovatively applies appropriate back pressure to the lower die during the superplastic forming process, thereby transforming the material's internal stress state into a triaxial stress state. This triaxial stress state effectively alleviates hydrogen enrichment during the superplastic forming process, preventing the deterioration of the material's mechanical properties caused by excessive hydrogen accumulation, thereby optimizing the superplastic forming process.

[0027] The invention is applicable to the field of hot processing of titanium hydride alloys, in particular to the technical field of superplastic forming of titanium hydride alloys. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following is a brief introduction to the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0029] Figure 1 This is a flow chart of a process optimization method for improving the superplastic forming limit of a hydrogenated titanium alloy plate proposed in the present invention;

[0030] Figure 2 The high temperature tensile dimensional data of the SP700 titanium alloy described in the present invention;

[0031] Figure 3 The uniaxial tensile elongation and superplastic tensile macromorphology of the SP700 titanium alloy with different hydrogen contents described in the present invention are as follows: Figure 3 (a) is the original SP700 titanium alloy, Figure 3 (b) is SP700 titanium alloy with 0.1wt% hydrogenation;

[0032] Figure 4 The superplastic expansion state of the SP700 titanium alloy with different hydrogen contents described in the present invention is Figure 4 (a) is the original SP700 titanium alloy, Figure 4 (b) is SP700 titanium alloy with 0.1wt% H hydrogenation;

[0033] Figure 5 The invention relates to a superplastic bulging die capable of providing back pressure and vacuuming. DETAILED DESCRIPTION

[0034] In the following description, specific details such as specific system structures and technologies are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application can also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to avoid unnecessary details that obscure the description of the present application.

[0035] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings. The following embodiments will help those skilled in the art further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that those skilled in the art may make various changes and improvements without departing from the scope of the present invention, and these are all within the scope of protection of the present invention.

[0036] Implementation Method 1: Combination Figure 1 This embodiment describes a process optimization method for improving the superplastic forming limit of hydrogenated titanium alloy plates. The purpose of this method is to improve the superplastic forming process of hydrogenated titanium alloys. By increasing the stress state, not only can the superplastic deformation be uniform, but the hydrogen enrichment characteristics can also be greatly alleviated, thereby ultimately improving the forming limit of the hydrogenated titanium alloy.

[0037] like Figure 1 As shown, the process optimization method proposed in this embodiment includes the following steps:

[0038] Step S1: After treating and cleaning the surface of the titanium alloy plate, high-purity hydrogen is introduced into the plate in a vacuum hydrogen furnace at 600-800° C. for 30 minutes to 2 hours, and the hydrogen pressure is controlled to obtain a target hydrogenation amount;

[0039] Step S2: determining the optimal superplastic temperature and true stress-true strain curve of titanium alloys with different hydrogen contents through uniaxial high-temperature tensile tests, and establishing a superplastic constitutive equation;

[0040] Step S3, performing finite element simulation based on the superplastic constitutive equation to obtain the optimal superplastic forming loading pressure required for bulging;

[0041] Step S4: spraying a boron nitride release agent on the surface of the hydrogenated plate, placing it in a superplastic forming mold, heating it to 700-900° C. and keeping it warm;

[0042] Step S5: Based on the optimal superplastic forming loading pressure, the pressure difference between the upper and lower molds is adjusted to form a multi-axial stress state on both sides of the sheet material, thereby suppressing the local enrichment of hydrogen elements;

[0043] Step S6: After forming, a staged cooling process is adopted: slow cooling from the optimal superplastic temperature to 550°C for dehydrogenation, and rapid cooling below 550°C.

[0044] This embodiment proposes a process optimization method for improving the superplastic forming limit of hydrogenated titanium alloy sheet. This method is a method for alleviating the deterioration of the mechanical properties of the material caused by hydrogen enrichment during superplastic forming of hydrogenated titanium alloy. This method can stabilize the superplastic forming process, reduce the excessive accumulation of hydrogen due to dislocation proliferation in the large deformation zone, achieve uniform superplastic deformation, and improve the forming limit of hydrogenated titanium alloy. At the same time, during the superplastic bulging process, appropriate back pressure is applied to the lower die to promote the transformation of the internal stress state of the material into a triaxial stress state, which can effectively alleviate the enrichment of hydrogen during the superplastic forming process, avoid the deterioration of the mechanical properties of the material due to excessive hydrogen accumulation, and achieve optimization of the superplastic bulging process.

[0045] Implementation method 2: This implementation method specifically describes the process optimization method for improving the superplastic forming limit of a hydrogenated titanium alloy sheet proposed in the above implementation method 1.

[0046] Step S1: After treating and cleaning the surface of the titanium alloy plate, high-purity hydrogen is introduced into the plate in a vacuum hydrogen furnace at 600-800° C. for 30 minutes to 2 hours, and the hydrogen pressure is controlled to obtain a target hydrogenation amount;

[0047] Specifically, the titanium alloy plate was first polished to 800#, placed in anhydrous ethanol for ultrasonic vibration cleaning and then dried, and then placed in a vacuum hydrogen furnace, and the vacuum degree in the furnace was pumped to 5×10 -3Pa, and then the temperature is raised. When the temperature reaches 600-800°C, high-purity hydrogen is introduced and kept warm for 30 minutes to 2 hours, and the required amount of hydrogen is obtained by controlling the hydrogen pressure.

[0048] Furthermore, the vacuum degree of the vacuum hydrogen furnace needs to be pumped to 5×10 -3 Pa, the titanium alloy plate is placed in.

[0049] Furthermore, the range of the above-mentioned controlled hydrogen pressure is 10 mbar to 0.1 MPa.

[0050] Step S2: determining the optimal superplastic temperature and true stress-true strain curve of titanium alloys with different hydrogen contents through uniaxial high-temperature tensile tests, and establishing a superplastic constitutive equation;

[0051] Specifically: Through uniaxial high-temperature tensile tests, the optimal superplastic temperature of titanium alloys with different hydrogen contents is determined, the true stress-true strain curve at the corresponding temperature is obtained, and the superplastic constitutive equation of titanium alloys with different hydrogen contents is obtained by calculation.

[0052] Step S3, performing finite element simulation based on the superplastic constitutive equation to obtain the optimal superplastic forming loading pressure required for bulging;

[0053] Specifically, the superplastic constitutive equation of titanium alloys with different hydrogen contents is brought into the finite element method for finite element simulation, the superplastic bulging loading pressure is optimized, and the optimal superplastic forming loading pressure required for bulging is obtained.

[0054] Step S4: spraying a boron nitride release agent on the surface of the hydrogenated plate, placing it in a superplastic forming mold, heating it to 700-900° C. and keeping it warm;

[0055] Specifically:

[0056] First, before superplastic forming, the hydrogenated sheet is placed in anhydrous ethanol for ultrasonic cleaning. After drying, a boron nitride isolation agent is sprayed on the surface of the sample to prevent adhesion to the mold at high temperature.

[0057] Then, the hydrogenated sheet is placed in a superplastic forming die, heated to the optimal superplastic forming temperature (700-900°C) of the hydrogen content material, and properly kept warm for 5-10 minutes to make the sheet temperature uniform.

[0058] Furthermore, the superplastic forming mold needs to have back pressure application and vacuum extraction functions, and the mold material is a high-temperature resistant alloy.

[0059] Step S5: Based on the optimal superplastic forming loading pressure, the pressure difference between the upper and lower molds is adjusted to form a multi-axial stress state on both sides of the sheet material, thereby suppressing the local enrichment of hydrogen elements;

[0060] Specifically:

[0061] Based on the optimal superplastic forming loading pressure obtained in the above step S3, high-purity argon gas is introduced into the gas path of the upper and lower molds to apply different gas pressures on both sides of the sheet. By adjusting the gas pressure of the upper and lower molds, a pressure difference can be formed on both sides of the sheet. By adjusting the pressure difference, the stress distribution state of the sheet during the superplastic process is changed, which plays a role in regulating the distribution of hydrogen elements.

[0062] Furthermore, in step S5, the pressure difference between the upper and lower molds is regulated by introducing high-purity argon gas, and the pressure difference range is 0.1 to 2 MPa.

[0063] Step S6: After forming, a staged cooling process is adopted: slow cooling from the optimal superplastic temperature to 550°C for dehydrogenation, and rapid cooling below 550°C.

[0064] Specifically:

[0065] After superplastic forming is completed, staged cooling is adopted, and slow cooling is adopted from the optimal superplastic temperature to 550℃ to remove most of the hydrogen elements as much as possible. After it drops below 550℃, rapid cooling is adopted.

[0066] Furthermore, the rate of segmented cooling in the above step S6 is controlled as follows: slow cooling at 1°C / min above 600°C (the range can be appropriately expanded), and fast cooling at ≥5°C / min below 550°C.

[0067] Furthermore, no additional vacuum annealing treatment is required after segmented cooling.

[0068] This embodiment removes hydrogen elements by cooling in stages, thereby eliminating the need for subsequent vacuum annealing of components, thereby saving time and energy.

[0069] In summary, this embodiment proposes a process optimization method for improving the superplastic forming limit of hydrogenated titanium alloy plates. This method is a method to alleviate the deterioration of the mechanical properties of the material caused by the enrichment of hydrogen elements during the superplastic forming of hydrogenated titanium alloys. This embodiment provides a multi-axial stress state, stabilizes the superplastic forming process, and reduces the excessive accumulation of hydrogen elements as dislocations in large deformation zones multiply, so that not only uniform superplastic deformation can be achieved, but also the forming limit of the hydrogenated titanium alloy can be improved.

[0070] Furthermore, this embodiment focuses on the stress state of hydrogenated titanium alloy during superplastic bulging, and finds that the biaxial tensile stress state is conducive to the uniform diffusion of hydrogen, which can delay the local accumulation of hydrogen, maintain the stable superplastic flow of the material, and improve the forming limit. Therefore, this embodiment innovatively applies appropriate back pressure to the lower die during the superplastic bulging process, thereby promoting the internal stress state of the material to a triaxial stress state. This triaxial stress state can effectively alleviate the enrichment of hydrogen elements during the superplastic forming process, avoid the deterioration of the mechanical properties of the material due to excessive accumulation of hydrogen elements, and thus optimize the superplastic bulging process.

[0071] Implementation method three: The process optimization for improving the superplastic forming limit of a hydrided titanium alloy plate proposed in the above implementation method can be embedded in a storage device. Therefore, this implementation method provides a process optimization system for improving the superplastic forming limit of a hydrided titanium alloy plate. The system includes a storage device, and the storage device is used to execute the process optimization method and steps for improving the superplastic forming limit of a hydrided titanium alloy plate proposed in the above implementation method.

[0072] Embodiment 4. This embodiment provides a computer-readable storage medium having a computer program stored thereon. When the computer program is run by a processor, the process optimization method for improving the superplastic forming limit of a hydrogenated titanium alloy sheet as described in any one of the above embodiments is executed.

[0073] Embodiment 5. This embodiment provides a computer device, which includes a memory and a processor, wherein a computer program is stored in the memory. When the processor runs the computer program stored in the memory, the processor executes any one of the above-mentioned process optimization methods for improving the superplastic forming limit of hydrogenated titanium alloy plates.

[0074] A computer device is provided in this embodiment. The hardware device of this part is a general model and is not shown in the form of a diagram. The system includes a processor and a memory, wherein the processor and the memory can be connected via a bus or other means. The memory is a non-transient computer-readable storage medium that can be used to store non-transient software programs, non-transient computer executable programs and modules, and corresponding program instructions / modules. The processor executes various functional applications and data processing of the processor by running the non-transient software programs, instructions and modules stored in the memory, so as to realize the process optimization method and steps for improving the superplastic forming limit of hydrogenated titanium alloy plate in the above method embodiment.

[0075] Implementation Method 6: Combination Figures 2 to 5 This embodiment is described. This embodiment provides a specific case description of a process optimization method for improving the superplastic forming limit of a hydrogenated titanium alloy sheet as described in the above embodiment.

[0076] The purpose is to compare the superplastic uniaxial tension and superplastic bulging of the original SP700 titanium alloy and 0.1wt%H titanium alloy, and to prove that superplastic bulging under multiaxial tensile stress state can alleviate the deficiency of elongation decrease in uniaxial tension.

[0077] The specific steps are as follows:

[0078] Step S1: grind a 1.2mm thick SP700 titanium alloy plate with a size of 50mm×50mm to 800#, clean it with ultrasonic cleaning and dry it, and then place it in a hydrogen furnace for hydrogenation. -3 Pa and then heated to 650 ° C. After introducing appropriate hydrogen pressure and keeping the temperature for 30 min, 0.1wt% H hydrogenated SP700 titanium alloy was prepared;

[0079] Step S2: Prepare by wire cutting Figure 2 The high temperature tensile test specimens shown in the figure were properly polished to remove the wire cutting marks and then placed in a high temperature tensile test apparatus to test the tensile properties. The high temperature tensile results of the original specimens and the hydrogenated 0.1 wt% H specimens are shown in Figure 2. Figure 3 As shown, the elongation of the original material is 1827%, and its optimal superplastic forming temperature is 760°C. The elongation of the hydrogenated 0.1wt% is 1510%, and its optimal superplastic forming temperature is 740°C.

[0080] Step S3: Establish a finite element model based on the constitutive equation obtained by uniaxial stretching to obtain the loading pressure for bulging. After the temperature is raised to the optimal superplastic temperature corresponding to the hydrogen content, keep it warm for 5 minutes, and apply pressure according to the loading pressure curve until the forming limit is reached. The bulging result is as follows: Figure 4 As shown;

[0081] Step S4: After the superplastic forming of hydrogenated SP700 titanium alloy is completed, the upper mold closes the air flow pipe, the lower mold starts to evacuate, and the temperature in the furnace is gradually reduced from 740℃ to 600℃ at a rate of 1℃ / min. When the temperature drops to 600℃, it is further reduced to 550℃ at a rate of 5℃ / min. After the temperature drops to 550℃, the furnace heating system is turned off and the furnace door is opened appropriately to rapidly reduce the temperature. Figure 5 shown.

[0082] In summary, the present invention proposes a process optimization method for improving the superplastic forming limit of hydrogenated titanium alloy sheets. Figure 3 Comparison of the macroscopic tensile morphology of the original SP700 titanium alloy and the SP700 titanium alloy with 0.1wt% hydrogenation, and Figure 4Comparison of the superplastic bulging morphology of the original SP700 titanium alloy and the SP700 titanium alloy with 0.1wt% H hydrogenation shows that this method can stabilize the superplastic forming process, reduce the excessive accumulation of hydrogen elements due to dislocation proliferation in the large deformation zone, achieve uniform superplastic deformation and improve the forming limit of hydrogenated titanium alloy. At the same time, applying appropriate back pressure to the lower die during the superplastic bulging process causes the internal stress state of the material to be transformed into a triaxial stress state, which can effectively alleviate the enrichment of hydrogen elements during the superplastic forming process, avoid the deterioration of the mechanical properties of the material due to excessive accumulation of hydrogen elements, and optimize the superplastic bulging process. This innovative technical means, through a unique stress state adjustment, effectively solves the difficult problems of hydrogenated titanium alloys in superplastic bulging, and improves the forming effect and material properties.

[0083] In the above description, it should be understood that when used in this specification and the appended claims, the term "comprising" indicates the presence of the described features, wholes, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their collections.

[0084] The foregoing description is merely an embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of the claims.

Claims

1. A process optimization method for improving the superplastic forming limit of hydrogenated titanium alloy sheet, characterized in that: The method is: S1. After surface treatment and cleaning of the titanium alloy plate, high-purity hydrogen is introduced into a vacuum hydrogen furnace at 600-800°C for 30 minutes to 2 hours, and the hydrogen pressure is controlled to obtain the target hydrogen content; S2. Determine the optimal superplastic temperature and true stress-true strain curve of titanium alloys with different hydrogen contents through uniaxial high-temperature tensile tests, and establish the superplastic constitutive equation; S3. Perform finite element simulation based on the superplastic constitutive equation to obtain the optimal superplastic forming loading pressure required for bulging; S4. After spraying boron nitride release agent on the surface of the hydrogenated plate, place it in a superplastic forming mold, heat it to 700-900°C and keep it warm; S5. Based on the optimal superplastic forming loading pressure, by adjusting the pressure difference between the upper and lower molds, a multi-axial stress state is formed on both sides of the sheet to suppress the local enrichment of hydrogen elements; S6. After forming, a segmented cooling process is adopted: slow cooling from the optimal superplastic temperature to 550°C to dehydrogenate, and rapid cooling below 550°C.

2. The process optimization method for improving the superplastic forming limit of a hydride titanium alloy sheet according to claim 1, characterized in that: The vacuum degree of the vacuum hydrogen furnace needs to be pumped to 5×10 -3 Pa, the hydrogen pressure range is 10mbar~0.1MPa.

3. The process optimization method for improving the superplastic forming limit of a hydride titanium alloy sheet according to claim 1, characterized in that: 700-900℃ is the optimal superplastic forming temperature for hydrogen-containing materials, and the holding time is 5-10 minutes.

4. The process optimization method for improving the superplastic forming limit of a hydride titanium alloy sheet according to claim 1, characterized in that: S5 is specifically: According to the optimal superplastic forming loading pressure, high-purity argon gas is introduced into the air paths of the upper and lower molds, so that different air pressures are applied on both sides of the sheet. By adjusting the air pressure of the upper and lower molds, a pressure difference is formed on both sides of the sheet. Finally, by adjusting the pressure difference, the stress distribution state of the sheet during the superplastic process is changed, thereby suppressing the local enrichment of hydrogen elements.

5. The process optimization method for improving the superplastic forming limit of a hydride titanium alloy sheet according to claim 4, characterized in that: The pressure difference range of high-purity argon is 0.1~2MPa.

6. The process optimization method for improving the superplastic forming limit of a hydride titanium alloy sheet according to claim 1, characterized in that: The rate of segmented cooling in S6 is controlled as follows: slow cooling at 1°C / min above 600°C and fast cooling at ≥5°C / min below 550°C.

7. The process optimization method for improving the superplastic forming limit of a hydride titanium alloy sheet according to claim 6, characterized in that: No additional vacuum annealing treatment is required after segmented cooling.

8. A process optimization system for improving the superplastic forming limit of hydrogenated titanium alloy sheets, characterized in that: The system includes a storage device, which is used to execute the method and steps described in claim 1.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a computer program, which, when executed by a processor, executes the process optimization method for improving the superplastic forming limit of a hydrogenated titanium alloy sheet according to any one of claims 1 to 7.

10. A computer device, characterized in that: The device includes a memory and a processor, wherein a computer program is stored in the memory. When the processor runs the computer program stored in the memory, the processor executes the process optimization method for improving the superplastic forming limit of a hydride titanium alloy plate as described in any one of claims 1 to 7.

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