Preparation method of high-strength, high-toughness and high-elongation TZM thick plate

Abstract

The invention discloses preparation of a high-strength, high-toughness and high-elongation TZM thick plate, and relates to the technical field of alloy preparation. The method comprises the steps that preparation raw materials are obtained, and the preparation raw materials comprise Mo powder, TiH2 powder, ZrH2 powder and C powder; the preparation method comprises the following steps: crushing and grinding TiH2 powder and ZrH2 powder, and sieving to obtain sieved TiH2 powder and sieved ZrH2 powder; the TZM powder is weighed according to the chemical component proportion and mixed, 0.5% of the sieved TiH2 powder is added in batches in the mixing process, and mixed powder is obtained; performing compression molding on the mixed powder to obtain a TZM powder blank; carrying out hot pressing sintering on the TZM powder blank to obtain a TZM blank; and the TZM blank is rolled and annealed to obtain the TZM thick plate. According to the embodiment of the invention, the high-strength and high-toughness TZM thick plate is prepared through the preparation steps of staged hot pressed sintering and star-shaped rolling, and the high elongation of the TZM thick plate is realized by optimizing the preparation and rolling annealing processes of the mixed powder.

Description

Technical Field

[0001] The present application belongs to the technical field of alloy preparation, and in particular relates to a method for preparing a high-strength, high-toughness, and high-elongation TZM thick plate. Background Art

[0002] Molybdenum itself has the characteristics of high melting point, low high temperature creep rate, good thermal shock resistance and high high temperature strength. It also has the advantages of good electrical conductivity, thermal conductivity, low expansion coefficient and sputtering rate. However, it will also undergo recrystallization above 1000°C, causing the material to become rapidly brittle, and its strength and toughness to drop sharply. TZM alloy can make up for the defects of pure molybdenum, has a high recrystallization temperature, and excellent high temperature mechanical properties. It is widely used in aerospace, military industry and nuclear energy. Such as rocket engine nozzles, weapon engine valve bodies, etc. As raw materials for parts of nuclear power plant reactors and high temperature structures of rocket engines, TZM thick plates must have very excellent mechanical properties.

[0003] With the technological progress in the application field of molybdenum alloys, TZM plates with performance far higher than the existing industry standards have been proposed, and the requirements for the impact toughness of TZM plates have been increased, that is, the tensile strength in any direction ≥ 900Mpa, the yield strength ≥ 800Mpa, the elongation ≥ 20%, and the impact toughness ≥ 20J. In the past, the conventional powder metallurgy combined with forging or rolling methods used for TZM thick plates were difficult to achieve such high comprehensive performance requirements.

[0004] At present, the preparation method of TZM alloy is usually to select alloy powder and molybdenum powder of appropriate strength, the molybdenum powder is screened through a 160-200 mesh screen, and the other powders are screened through a 270-400 mesh screen, and then the alloy powder is premixed with 20% of the total Mo powder, and then screened through a 160-200 molybdenum screen, and then the premixed gold powder and the remaining Mo powder are stirred in a vacuum mixer, and the desired plate is obtained after pressing, sintering, forging or rolling, stress relief annealing, and flaw detection, but the alloy powder is not processed, resulting in uneven alloy powder particle size, and at the same time in small batches Directly adding alloy powder during mixing will cause the TiH2 powder to easily agglomerate during mixing, resulting in uneven TZM blanks. In addition, when the blanks are generally rolled or forged, the anisotropy of the materials will be caused, making the material properties inconsistent in different directions. Alternatively, the alloy powders and MoO2 powders are mixed in a V-type mixer, and then reduced in a thirteen-tube molybdenum wire heating resistance furnace. Multiple batches of alloy powders are combined and passed through a vibrating screen, and then the mixed TZM alloy powders are pressed, sintered, forged, and rolled to prepare TZM plates. Although this method can produce a uniform blank, it causes a large waste of energy through the reduction process of alloy powders and molybdenum oxide powders. Summary of the invention

[0005] The purpose of this application is to provide a method for preparing a high-strength, high-toughness and high-elongation TZM thick plate, and to prepare a high-strength, high-toughness and high-elongation TZM thick plate through a series of processes including mixing, pressing, sintering, rolling and annealing.

[0006] In order to achieve the above objectives, the solution of the present application is to provide a method for preparing a high-strength, high-toughness and high-elongation TZM thick plate, comprising: Obtaining raw materials for preparation, the raw materials for preparation include Mo powder, TiH2 powder, ZrH2 powder and C powder; crushing and grinding the TiH2 powder and the ZrH2 powder and then sieving them to obtain sieved TiH2 powder and sieved ZrH2 powder; weighing out 0.5% sieved TiH2 powder, 1% sieved ZrH2 powder, 0.04% C powder and 98.46% Mo powder according to the chemical composition ratio of TZM powder; 0.04% C powder, 1% sieved ZrH2 powder and 98.46% Mo powder are mixed, and 0.5% sieved TiH2 powder is added in batches during the mixing process to obtain a mixed powder; The mixed powder is pressed into a shape to obtain a TZM powder block; the TZM powder block is hot-pressed and sintered to obtain a TZM block material; and the TZM block material is rolled and annealed to obtain a TZM thick plate.

[0007] According to the above method of the embodiment of the present application, the following additional technical features may also be provided: Furthermore, the prepared raw materials include Mo powder, TiH2 powder, ZrH2 powder and C powder, wherein the Fischer-Tropsch particle size of the Mo powder is 2.0 μm-3.0 μm, the size of the TiH2 powder is 500 mesh, the size of the ZrH2 powder is 400 mesh, and the Fischer-Tropsch particle size of the C powder is 2.0 μm.

[0008] Furthermore, the TiH2 powder and the ZrH2 powder are crushed, ground and then sieved, including ball-milling the TiH2 powder and the ZrH2 powder in a ball mill and then sieving.

[0009] Further, 0.04% of C powder, 1% of sieved ZrH2 powder and 98.46% of Mo powder are mixed, including mixing 0.04% of C powder, 1% of sieved ZrH2 powder and 98.46% of Mo powder in a three-dimensional mixer.

[0010] Furthermore, the mixed powder is pressed into a shape to obtain a TZM powder block, including pressing the mixed powder in a cold isostatic press to obtain a TZM powder block.

[0011] Furthermore, the TZM stock is rolled and annealed to obtain the TZM thick plate, including rolling the TZM stock in a cross-shaped manner and annealing to obtain the TZM thick plate.

[0012] Furthermore, the method includes dividing 0.5% sieved TiH2 powder into three equal parts, mixing 0.04% C powder, 1% sieved ZrH2 powder and 98.46% Mo powder in a three-dimensional mixer, and adding 1 part of 0.5% sieved TiH2 powder to the three-dimensional mixer when the mixing time reaches 1 hour, 2 hours and 3 hours respectively.

[0013] Further, the TZM powder is hot pressed and sintered to obtain a TZM material, including performing a staged temperature increase during the hot pressing and sintering process, wherein: In the first stage, the temperature is raised from room temperature to 900°C, the holding time is 2-3h, and the vacuum degree is less than 2.0×10 -2 Mpa; In the second stage, the temperature is raised from 900°C to 1700-1750°C, and the holding time is 1-2h. The vacuum degree during the heating and holding period is less than 1.6×10 -2 Mpa, hot pressing pressure is maintained at 5-7Mpa; The temperature is raised from 1700℃-1750℃ to 1800-1900℃ in three stages, and the holding time is 4-6 hours. The vacuum degree during the heating and holding period is less than 1.0×10 -2 Mpa, the hot pressing pressure is maintained at 12-20Mpa, and the height shrinkage rate is 15-25%.

[0014] Furthermore, the TZM stock is rolled in a cross-shaped direction, including maintaining the temperature at 1280-1300°C for 1-2 hours during the rolling process, and rolling in a cross-shaped direction for four passes in one fire, with the processing rate of each pass being evenly distributed.

[0015] Furthermore, the annealing includes recrystallization annealing, and the temperature of the recrystallization annealing is maintained at 1320-1350° C., and the holding time is 0.5 h.

[0016] The method for preparing the high-strength, high-toughness and high-elongation TZM thick plate provided in the embodiment of the present application has the following beneficial technical effects compared with the prior art: In the embodiment of the present application, the TiH2 powder that is easy to agglomerate is added in batches for mixing, thereby avoiding the agglomeration of the TiH2 powder during mixing, and also reducing the premixing steps, thereby improving production efficiency.

[0017] The embodiment of the present application prepares a TZM thick plate with high strength and high toughness by selecting raw materials of TiH2 powder, ZrH2 powder and Mo powder and C powder of specific size and preparing steps of hot pressing sintering and cross-shaped rolling in stages. The TZM thick plate (thickness 10-20 mm) prepared in the embodiment of the present application has a tensile strength of ≥900 MPa, a yield strength of ≥800 MPa, an elongation of ≥20%, an impact toughness of ≥20J, an O content of <50 ppm, a N content of <10 ppm, a C content of 200-250 ppm, a Ti content of 4900-5100 ppm, and a Zr content of 900-1000 ppm, and can withstand high loads or complex stress environments.

[0018] The embodiment of the present application achieves high elongation of TZM thick plates by optimizing the preparation of mixed powder and the rolling annealing process, and can undergo large plastic deformation without breaking when subjected to external forces, thereby improving the durability and reliability of the material.

[0019] The embodiment of the present application obtains a TZM thick plate with a uniform and fine grain structure through fine powder processing and hot pressing sintering process, and sintering is performed at low temperature, under pressure and in a vacuum environment, thereby improving the overall performance of the material, including strength, toughness and elongation.

[0020] The rolling and annealing steps in the embodiments of the present application ensure that the TZM thick plate maintains stable performance during the processing, plays a role in refining the grains, and improves the mechanical properties of the material, especially the M-shaped rolling method. The M-shaped rolling method can effectively achieve sufficient crushing of the grains of the rolled plate, thereby playing a role in refining the grains. At the same time, under this rolling method, the tensile properties and impact toughness in each rolling direction can be consistent, eliminating stress concentration and defects inside the material, and improving the overall quality and reliability of the material. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic flow chart of a method for preparing a high-strength, high-toughness, and high-elongation TZM thick plate according to an embodiment of the present application is shown; Figure 2 A schematic diagram of the cross-shaped rolling according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0022] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. It is to be understood that the specific embodiments described herein are only used to explain the present application, rather than to limit the present application. It should also be noted that, for ease of description, only some structures related to the present application are shown in the accompanying drawings, rather than all structures. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0023] The terms "including" and "having" and any variations thereof in this application are intended to cover non-exclusive inclusions. Reference to "embodiments" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments.

[0024] like Figure 1 As shown, the embodiment of the present application provides a method for preparing a high-strength, high-toughness and high-elongation TZM thick plate, comprising the following steps: Step 101, obtaining raw materials for preparation, the raw materials for preparation including Mo powder, TiH2 powder, ZrH2 powder and C powder; crushing and grinding the TiH2 powder and the ZrH2 powder and sieving them to obtain sifted TiH2 powder and sifted ZrH2 powder; weighing out 0.5% sifted TiH2 powder, 1% sifted ZrH2 powder, 0.04% C powder and 98.46% Mo powder according to the chemical composition ratio of TZM powder.

[0025] The raw materials for the preparation of the embodiment of the present application include Mo powder, TiH2 powder, ZrH2 powder and C powder. The TiH2 powder and ZrH2 powder are crushed and ground to ensure that their particle sizes meet the requirements of subsequent processes. The ground powder is further screened out by a screening step to obtain TiH2 powder and ZrH2 powder that meet the size requirements.

[0026] According to the chemical composition ratio of TZM powder, 0.5% sieved TiH2 powder, 1% sieved ZrH2 powder, 0.04% C powder and 98.46% Mo powder were accurately weighed out.

[0027] Specifically, the Fischer-Tropsch particle size of Mo powder is 2.0μm-3.0μm. This particle size range ensures the uniformity and plasticity of Mo powder during mixing and pressing. The size of TiH2 powder is 500 mesh, which ensures the effective dispersion and uniformity of TiH2 powder during ball milling and sieving. The size of ZrH2 powder is 400 mesh, which is similar to TiH2 powder, and this size helps its uniform distribution during mixing and pressing. The Fischer-Tropsch particle size of C powder is 2.0μm, which ensures the uniformity of C powder during mixing.

[0028] Furthermore, in the embodiment of the present application, TiH2 powder and ZrH2 powder are ball-milled in a ball mill and then sieved. The purpose of the ball-milling step is to further refine the powder particles and increase their specific surface area, thereby enhancing the bonding force between the powders and the performance of the final product. The sieving step ensures that the powder after ball milling meets the particle size requirements of the subsequent process.

[0029] Step 101 involves the preparation and processing of raw materials, which lays a solid foundation for the subsequent mixing, pressing, sintering and rolling annealing steps by accurately weighing raw materials that meet specification requirements, ball milling and screening in a ball mill.

[0030] Step 102, 0.04% C powder, 1% sieved ZrH2 powder and 98.46% Mo powder are mixed, and 0.5% sieved TiH2 powder is added in batches during the mixing process to obtain a mixed powder.

[0031] The embodiment of the present application requires mixing 0.04% C powder, 1% sieved ZrH2 powder and 98.46% Mo powder. The purpose of mixing is to ensure that the various raw materials can be evenly distributed so as to form a uniform microstructure in the subsequent pressing and sintering process.

[0032] In order to improve mixing efficiency and quality, these raw materials are mixed in a three-dimensional mixer. The three-dimensional mixer, through its unique mixing mechanism, can ensure that the raw materials are fully mixed in three-dimensional space, thereby further improving the uniformity of mixing.

[0033] In the mixing process of the embodiment of the present application, 0.5% sieved TiH2 powder is added in batches, and the 0.5% TiH2 powder is evenly divided into 3 portions, and 1 portion is added to the three-dimensional mixer when the mixing time reaches 1 hour, 2 hours and 3 hours respectively. This batch addition method helps to ensure that the TiH2 powder can be evenly distributed in the mixed powder, thereby avoiding the situation where the local concentration is too high or too low.

[0034] The mixing process should ensure uniformity. If the mixing is not uniform, it may lead to the formation of uneven microstructures during the pressing and sintering process, thereby affecting the performance of the final product. Therefore, the embodiment of the present application uses a three-dimensional mixer for mixing, and strictly controls the addition time and amount of TiH2 powder to ensure the quality of the mixing process.

[0035] In summary, step 102 details the mixing steps in the preparation process of the high-strength, high-toughness, and high-elongation TZM thick plate. The uniformity and quality of the mixing process are ensured by using a three-dimensional mixer for mixing and strictly controlling the addition time and amount of TiH2 powder.

[0036] Step 103, pressing the mixed powder into a shape to obtain TZM powder.

[0037] The mixed powder is obtained by preparing the raw materials in step 101 and mixing in step 102, and contains various elements required for the TZM alloy, and is accurately weighed in a specific ratio. The mixed powder is fully uniform during the mixing process, providing a good foundation for subsequent pressing and molding.

[0038] In the embodiment of the present application, the mixed powder is placed in a cold isostatic press for compression molding. A cold isostatic press is a device that uses a liquid medium to transmit pressure to perform isostatic pressing on a workpiece. It can apply uniform pressure to the mixed powder in all directions so that the mixed powder can be tightly combined together to form a TZM powder block with a certain shape and strength. Through compression molding in a cold isostatic press, a TZM powder block with a regular shape, uniform density and high strength can be obtained. These powder blocks provide a good foundation for subsequent hot pressing and sintering, so that the sintered TZM block has a higher density and better performance.

[0039] Step 104, hot pressing and sintering the TZM powder to obtain a TZM blank.

[0040] The purpose of step 104 is to convert the TZM powder into a dense TZM blank by hot pressing and sintering. Hot pressing and sintering is a process of applying pressure and sintering at high temperature at the same time, which can improve the density and mechanical properties of the material. During the hot pressing and sintering process, it is necessary to increase the temperature in stages to ensure uniform sintering and densification of the material. The following is the specific process of the staged temperature increase: Stage 1: Raise the temperature from room temperature to 900°C for 2-3 hours. In this stage, the main purpose is to preheat the TZM powder and gradually raise its temperature to near the sintering temperature. At the same time, maintain a certain vacuum degree (less than 2.0×10 - 2 Mpa) to prevent the material from oxidizing at high temperatures.

[0041] Stage 2: Raise the temperature from 900℃ to 1700-1750℃ and keep it at this temperature for 1-2 hours. In this stage, the TZM powder begins to undergo a significant sintering reaction, the bonding force between particles is enhanced, and the density of the material gradually increases. At the same time, continue to maintain a certain vacuum degree and hot pressing pressure (5-7Mpa) to promote the sintering reaction.

[0042] Stage 3: Raise the temperature from 1700-1750℃ to 1800-1900℃ and keep it at this temperature for 4-6 hours. This is the last stage of the hot pressing sintering process and the most critical stage. In this stage, the material continues to undergo sintering reaction, the density is further improved, and a stable microstructure is formed. In order to obtain a better sintering effect, it is necessary to continue to maintain a low vacuum degree (less than 1.0×10 -2 Mpa) and higher hot pressing pressure (12-20Mpa). In addition, the height shrinkage rate at this stage is also an important parameter, which reflects the degree of densification of the material during the sintering process. The height shrinkage rate is between 15-25%.

[0043] Specifically, in this embodiment, the hot pressing sintering is heated from room temperature to 900°C, kept at this temperature for 2 hours, and the vacuum degree is 1.8×10 - 2 Mpa; heating from 900℃ to 1700℃, keeping temperature for 1, vacuum degree during heating and keeping temperature is 1.5×10 -2 Mpa, the hot pressing pressure is maintained at 5Mpa; the temperature is raised from 1700℃ to 1800℃, and the temperature is kept for 4 hours. The vacuum degree during the heating and holding period is 8×10 -3 Mpa, hot pressing pressure maintained at 12Mpa, grain count 13,000 / mm 2 , height shrinkage rate 15%.

[0044] In another embodiment, the hot pressing sintering is heated from room temperature to 900°C, kept at this temperature for 3 hours, and the vacuum degree is less than 1.7×10 -2 Mpa; heating from 900℃ to 1750℃, keeping temperature for 2h, vacuum degree during heating and keeping temperature is 1.5×10 -2 Mpa, the hot pressing pressure was maintained at 7Mpa; the temperature was raised from 1750℃ to 1900℃, and the temperature was kept for 6 hours. During the heating and holding period, the vacuum was 6×10 -3 Mpa, hot pressing pressure maintained at 20Mpa, grain count 11,500 / mm 2 , height shrinkage rate 25%.

[0045] In another embodiment, the hot pressing sintering is heated from room temperature to 900°C, kept at this temperature for 2.5 hours, and the vacuum degree is 1.9×10 -2 Mpa; heating from 900℃ to 1730℃, keeping temperature for 1.5h, vacuum degree during heating and keeping temperature is 1.4×10-2 Mpa, the hot pressing pressure was maintained at 6Mpa; the temperature was raised from 1730℃ to 1850℃, and the temperature was kept for 5 hours. During the heating and holding period, the vacuum was 9×10 -3 Mpa, hot pressing pressure maintained at 15Mpa, grain count 12,000 / mm 2 , height shrinkage rate 20%.

[0046] Step 105, rolling and annealing the TZM stock to obtain a TZM thick plate.

[0047] Step 105 aims to improve the microstructure and properties of the material through rolling and annealing processes, thereby obtaining a TZM thick plate with high strength, high toughness and high elongation. The embodiment of the present application maintains the temperature at 1280-1300°C. This temperature range helps to ensure that the material has sufficient plasticity and fluidity during the rolling process, thereby avoiding cracks and fractures. The insulation time is 2 hours to ensure that the temperature inside the material is evenly distributed and reduce the stress concentration caused by the temperature gradient. One fire and four passes are used to roll in a M-shaped direction. M-shaped rolling is a special rolling method that changes the rolling direction so that the material can be uniformly deformed in all directions, thereby improving the uniformity and performance of the material. The processing rate of each pass is evenly distributed, avoiding internal stress concentration and defects in the material caused by excessive processing rates.

[0048] Furthermore, recrystallization annealing is used. Recrystallization annealing is a process in which the grains inside the material are rearranged and grown by heating the material to a certain temperature, which helps to eliminate the work hardening and residual stress generated during the rolling process. The annealing temperature is maintained at 1320-1350°C. This temperature range helps to promote the recrystallization process of the material while avoiding excessive grain growth due to excessive temperature. The holding time is 0.5 hours to ensure that sufficient recrystallization occurs inside the material while avoiding the degradation of material performance due to excessive holding time.

[0049] Specifically, in this embodiment, Figure 2 As shown, the billet obtained in step 104 is heated to 1280°C, kept warm for 1 hour, and rolled in 4 passes in a cross-shaped direction, with an average processing rate of 25% for each pass. Then annealing is performed at 1350°C and kept warm for 0.5 hours. The TZM thick plate prepared in this embodiment has a tensile strength of 937Mpa, a yield strength of 876Mpa, an elongation of 26.8%, an impact toughness of 31.1J, a C content of 210ppm, a Ti content of 4970ppm, a Zr content of 910ppm, a N content of 8ppm, and an O content of 46ppm.

[0050] In another embodiment, the billet obtained in step 104 is heated to a heating temperature of 1300°C, kept warm for 1.5 hours, and rolled in four passes in a fire, and rolled in a cross-shaped direction, with an average processing rate of 20% for each pass. Then annealing is performed at an annealing temperature of 1320°C and kept warm for 0.5 hours. In another embodiment, the prepared TZM thick plate has a tensile strength of 930Mpa, a yield strength of 870Mpa, an elongation of 27%, an impact toughness of 27.9J, a C content of 230ppm, a Ti content of 5020ppm, a Zr content of 950ppm, a N content of 9ppm, and an O content of 43ppm.

[0051] In another embodiment, the billet obtained in step 104 is heated to 1290°C for 2 hours, and rolled in 4 passes in a cross-shaped direction, with an average processing rate of 23% for each pass. Then annealing is performed at 1330°C for 0.5 hours. In another embodiment, the prepared TZM thick plate has a tensile strength of 949Mpa, a yield strength of 876Mpa, an elongation of 26.5%, an impact toughness of 28.8J, a C content of 240ppm, a Ti content of 5000ppm, a Zr content of 990ppm, a N content of 7ppm, and an O content of 32ppm.

[0052] In summary, step 105 can significantly improve the microstructure and performance of the material by performing cross-shaped rolling and recrystallization annealing on the TZM blank. Cross-shaped rolling helps to improve the uniformity and performance of the material, while recrystallization annealing helps to eliminate work hardening and residual stress, and improve the plasticity and toughness of the material. Under the combined effect of these measures, the final TZM thick plate has excellent properties of high strength, high toughness and high elongation.

[0053] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A method for preparing a high-strength, high-toughness and high-elongation TZM thick plate, characterized in that: The method comprises: Obtaining raw materials for preparation, the raw materials for preparation comprising Mo powder, TiH2 powder, ZrH2 powder and C powder; crushing and grinding the TiH2 powder and ZrH2 powder and then sieving to obtain sieved TiH2 powder and sieved ZrH2 powder; weighing out 0.5% sieved TiH2 powder, 1% sieved ZrH2 powder, 0.04% C powder and 98.46% Mo powder according to the chemical composition ratio of TZM powder; The 0.04% C powder, 1% sieved ZrH2 powder and 98.46% Mo powder are mixed, and during the mixing process, the 0.5% sieved TiH2 powder is added in batches to obtain a mixed powder; The mixed powder is pressed into a shape to obtain a TZM powder block; the TZM powder block is hot-pressed and sintered to obtain a TZM block material; and the TZM block material is rolled and annealed to obtain a TZM thick plate.

2. The method for preparing the high-strength, high-toughness and high-elongation TZM thick plate according to claim 1, characterized in that: The preparation raw materials include Mo powder, TiH2 powder, ZrH2 powder and C powder, wherein the Mo powder has a Fischer-Tropsch particle size of 2.0 μm-3.0 μm, the TiH2 powder has a size of 500 mesh, the ZrH2 powder has a size of 400 mesh, and the C powder has a Fischer-Tropsch particle size of 2.0 μm.

3. The method for preparing the high-strength, high-toughness and high-elongation TZM thick plate according to claim 1, characterized in that: The method of crushing and grinding the TiH2 powder and the ZrH2 powder and then screening the powder comprises: The TiH2 powder and ZrH2 powder are ball-milled in a ball mill and then sieved.

4. The method for preparing the high-strength, high-toughness and high-elongation TZM thick plate according to claim 1, characterized in that: The 0.04% C powder, 1% sieved ZrH2 powder and 98.46% Mo powder are mixed, comprising: The 0.04% C powder, 1% sieved ZrH2 powder and 98.46% Mo powder are mixed in a three-dimensional mixer.

5. The method for preparing the high-strength, high-toughness and high-elongation TZM thick plate according to claim 1, characterized in that: The method of pressing the mixed powder into a shape to obtain TZM powder tablets comprises: The mixed powder is pressed in a cold isostatic press to obtain TZM powder.

6. The method for preparing the high-strength, high-toughness and high-elongation TZM thick plate according to claim 1, characterized in that: The method of rolling and annealing the TZM stock to obtain the TZM thick plate comprises: The TZM stock is rolled in a cross-shaped manner and annealed to obtain a TZM thick plate.

7. The method for preparing the high-strength, high-toughness and high-elongation TZM thick plate according to claim 4, characterized in that: The method comprises: The 0.5% sieved TiH2 powder was evenly divided into 3 parts, and the 0.04% C powder, 1% sieved ZrH2 powder and 98.46% Mo powder were mixed in a three-dimensional mixer. When the mixing time reached 1 hour, 2 hours and 3 hours, 1 part of 0.5% sieved TiH2 powder was added to the three-dimensional mixer respectively.

8. The method for preparing the high-strength, high-toughness and high-elongation TZM thick plate according to claim 1, characterized in that: The hot pressing and sintering of the TZM powder to obtain the TZM material includes performing staged temperature increase during the hot pressing and sintering process, wherein: In the first stage, the temperature is raised from room temperature to 900°C, the holding time is 2-3h, and the vacuum degree is less than 2.0×10 -2 Mpa; In the second stage, the temperature is raised from 900°C to 1700-1750°C, and the holding time is 1-2h. The vacuum degree during the heating and holding period is less than 1.6×10 -2 Mpa, hot pressing pressure is maintained at 5-7Mpa; The temperature is raised from 1700℃-1750℃ to 1800-1900℃ in three stages, and the holding time is 4-6 hours. The vacuum degree during the heating and holding period is less than 1.0×10 -2 Mpa, the hot pressing pressure is maintained at 12-20Mpa, and the height shrinkage rate is 15-25%.

9. The method for preparing the high-strength, high-toughness and high-elongation TZM thick plate according to claim 6, characterized in that: The method of rolling the TZM blank into a cross-shaped roll comprises: During the rolling process, the temperature is maintained at 1280-1300℃, the holding time is 1-2h, and the rolling is performed in 4 passes in the M-shaped direction, with the processing rate of each pass evenly distributed.

10. The method for preparing the high-strength, high-toughness and high-elongation TZM thick plate according to claim 1, characterized in that: The annealing includes recrystallization annealing, and the temperature of the recrystallization annealing is maintained at 1320-1350° C., and the holding time is 0.5 h.

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