A method for preparing high-strength titanium alloy with high plasticity and strength by using an additive manufacturing process

Abstract

The application discloses a method for preparing high-strength titanium alloy with high plasticity and high strength by using an additive manufacturing process, and comprises the following steps: (1) vacuum consumable electrode arc melting raw materials twice to obtain secondary ingots; (2) processing the secondary ingots into round bars, and performing plasma rotating electrode atomization on the round bars to obtain titanium alloy powder; (3) performing electron beam additive manufacturing on the titanium alloy powder to obtain a titanium alloy sample; and (4) heat treating the titanium alloy sample to obtain high-strength titanium alloy with high plasticity and high strength. The method greatly guarantees the quality of the powder through the pre-positioned vacuum consumable electrode arc melting and plasma rotating electrode atomization, and then the titanium alloy sample is obtained by using electron beam additive manufacturing, and the microstructure of the titanium alloy sample is regulated by using heat treatment, so that the high-strength titanium alloy with high plasticity and high strength is obtained, and the prepared high-strength titanium alloy with high plasticity and high strength has a tensile strength greater than 1300 MPa and an elongation of more than 5%.

Description

Technical Field

[0001] This invention belongs to the field of additive manufacturing high-strength titanium alloy technology, specifically relating to a method for preparing high-strength titanium alloys that combines strength and plasticity using additive manufacturing processes. Background Technology

[0002] High-strength titanium alloys are widely used in aerospace and other fields due to their low density, high strength, and corrosion resistance. In recent years, additive manufacturing of complex titanium alloy parts has gradually become one of the preferred processes for lightweighting aerospace equipment. However, because high-strength titanium alloys contain a large amount of β-stabilizing elements, a large number of fine needle-like α phases precipitate in the matrix after additive manufacturing, resulting in a significantly lower elongation than the forged state.

[0003] Existing technologies using additive manufacturing processes to control alloy microstructure result in high-strength titanium alloys with tensile strengths of approximately 1200–1300 MPa and elongation of less than 5%, exhibiting characteristics of high strength and low ductility. Therefore, to meet the design and application requirements of titanium alloys, there is an urgent need to develop a method for preparing high-strength titanium alloys that balances the strength and ductility of the alloy. Summary of the Invention

[0004] The technical problem to be solved by this invention is to address the shortcomings of the prior art by providing a method for preparing high-strength titanium alloys that balance strength and plasticity using additive manufacturing processes. This method utilizes pre-processing vacuum consumable electrode arc melting and plasma rotating electrode atomization powder preparation, which greatly ensures the quality of the powder. Then, electron beam additive manufacturing and heat treatment are used to control the microstructure of the titanium alloy sample, resulting in a high-strength titanium alloy with uniform microstructure and a balance of strength and plasticity. The prepared high-strength titanium alloy maintains an elongation of over 5% while achieving a tensile strength greater than 1300 MPa.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is: a method for preparing high-strength titanium alloys with both strength and plasticity suitable for additive manufacturing processes, characterized in that the method includes the following steps:

[0006] Step 1: The titanium alloy raw material is melted once by vacuum consumable electrode arc to obtain a primary ingot. Then, two or three primary ingots are welded together and melted a second time by vacuum consumable electrode arc to obtain a secondary ingot. The titanium alloy raw material is prepared according to the composition Ti-5Al-4Cr-4Mo-4V-3Zr.

[0007] Step 2: Process the secondary ingot obtained in Step 1 into a round bar, and then perform plasma rotating electrode atomization to obtain titanium alloy powder.

[0008] Step 3: Perform electron beam additive manufacturing on the titanium alloy powder obtained in Step 2 to obtain a titanium alloy sample;

[0009] Step 4: Heat treat the titanium alloy sample obtained in Step 3 to obtain a high-strength titanium alloy that combines strength and plasticity.

[0010] This invention first presses titanium alloy raw materials to obtain a primary consumable electrode, then performs a vacuum consumable electrode arc melting process to obtain a primary ingot. Two to three primary ingots are then welded together to obtain a secondary consumable electrode, which is then subjected to a vacuum consumable electrode arc melting process to obtain a secondary ingot. The primary and secondary consumable electrodes serve as cathodes, and a copper crucible serves as the anode. In a vacuum or inert atmosphere, the primary or secondary consumable electrodes are rapidly melted under high-temperature arc heating to form a molten pool, which is then stirred. Some volatile impurities diffuse to the surface of the molten pool and are removed. The chemical composition of the alloy is then thoroughly homogenized through stirring. The secondary ingot is then machined into a round bar, with threads machined at one end to connect to the electrode spindle of a plasma rotating electrode atomization device. The round bar is then fixed on the rotating electrode device for plasma rotating electrode atomization powder production.

[0011] This invention manufactures titanium alloy powder specifically for additive manufacturing by using a pre-positioned vacuum consumable electrode arc melting and plasma rotating electrode atomization powder preparation, which greatly ensures the quality of the powder. Then, electron beam additive manufacturing is used to obtain titanium alloy samples, and heat treatment is then used to control the microstructure of the titanium alloy samples to obtain a high-strength titanium alloy with uniform microstructure and a balance of strength and plasticity.

[0012] The above-described method for preparing high-strength titanium alloys with both strength and plasticity using additive manufacturing processes is characterized in that the primary ingot in step one has a mass of 10kg to 25kg and a cylindrical shape with a diameter of 90mm to 120mm and a height of 320mm to 500mm; the secondary ingot has a mass of 20kg to 50kg and a cylindrical shape with a diameter of 120mm to 160mm and a height of 320mm to 500mm. This invention, by controlling the parameters of vacuum consumable electrode arc melting, allows the prepared secondary ingot to be directly used for plasma rotating electrode atomization powder production after simple processing, effectively improving material utilization and processing efficiency.

[0013] The above-described method for preparing high-strength titanium alloys with both strength and plasticity using additive manufacturing processes is characterized in that the processing in step two involves hot working or machining the secondary ingot into a round bar with a metallic luster, the diameter of which is 30mm to 75mm. This invention, by controlling the processing parameters, makes the round bar compatible with most plasma rotating electrode atomization devices.

[0014] The above-described method for preparing high-strength titanium alloys with both strength and plasticity using additive manufacturing processes is characterized in that, in step two, the plasma rotating electrode atomization powder preparation process utilizes a plasma arc to heat and melt the end face of a round rod, performing a powder-spinning process. The electrode rotation speed is 20000 r / min to 32000 r / min, the current is 1100 A to 1500 A, and the voltage is 50 V to 60 V. Then, titanium alloy powder with a particle size of 20 μm to 150 μm is collected through a powder sieve. This invention, by controlling the parameters of plasma rotating electrode atomization powder preparation, achieves a powder recovery rate of over 90% for titanium alloy powder with a particle size of 20 μm to 150 μm, while also ensuring the quality of the titanium alloy powder, enabling subsequent processing to yield high-strength titanium alloys with both strength and plasticity.

[0015] The above-described method for preparing high-strength titanium alloys with both strength and plasticity using additive manufacturing processes is characterized by the following parameters for electron beam additive manufacturing in step three: preheating temperature of 700℃~760℃, scanning current of 10mA~17mA, and scanning speed of 3m / s~6m / s. This invention effectively balances the additive manufacturing precision, forming quality, and forming efficiency of titanium alloys by controlling the parameters of electron beam additive manufacturing, thus ensuring the performance of the subsequently prepared high-strength titanium alloys that combine strength and plasticity.

[0016] The above-mentioned method for preparing high-strength titanium alloys with both strength and plasticity using additive manufacturing processes is characterized in that the heat treatment process in step four is as follows: the muffle furnace is heated to 850℃~880℃, the titanium alloy sample is placed in the muffle furnace and held for 1h~2h, and then cooled with the furnace to 700℃~750℃ at a cooling rate of 0.1℃ / min~0.5℃ / min. After that, the titanium alloy sample is taken out and air-cooled to room temperature. The muffle furnace is then heated to 500℃~580℃, and the titanium alloy sample that has been air-cooled to room temperature is placed in the muffle furnace and held for 2h~6h, and finally air-cooled. This invention first heats the muffle furnace to 850℃~880℃, which is 30℃~50℃ above the phase transformation point. The titanium alloy sample is placed in the muffle furnace and held for 1h~2h. This allows the fine needle-like α phase generated during the additive manufacturing process to dissolve back during the heat treatment holding process. Then, the sample is cooled in the furnace at a rate of 0.1℃ / min~0.5℃ / min to 700℃~750℃, and then air-cooled to room temperature. This allows the α phase to precipitate and grow discontinuously on and within the β grain boundaries, effectively ensuring the plastic strength of the titanium alloy. Subsequently, the muffle furnace is heated again to 500℃~580℃, and the air-cooled titanium alloy sample is placed in the muffle furnace and held for 2h~6h. Finally, it is air-cooled, causing a large number of basketweave structures to precipitate in the titanium alloy sample. This significantly improves the strength of the titanium alloy while ensuring that the plasticity is not lower than the engineering requirements, i.e., the elongation is not lower than 5%.

[0017] The above-mentioned method for preparing high-strength titanium alloys with both strength and plasticity using additive manufacturing processes is characterized in that the high-strength titanium alloy with both strength and plasticity in step four maintains an elongation of more than 5% while having a tensile strength greater than 1300 MPa.

[0018] Compared with the prior art, the present invention has the following advantages:

[0019] 1. This invention manufactures titanium alloy powder specifically for additive manufacturing by using a pre-positioned vacuum consumable electrode arc melting and plasma rotating electrode atomization powder preparation, which greatly ensures the quality of the powder. Then, electron beam additive manufacturing is used to obtain titanium alloy samples, and heat treatment is then used to control the microstructure of the titanium alloy samples to obtain a high-strength titanium alloy with uniform microstructure and a balance between strength and plasticity. The prepared high-strength titanium alloy with a balance between strength and plasticity maintains an elongation of more than 5% while having a tensile strength greater than 1300MPa.

[0020] 2. This invention removes volatile impurities by performing two vacuum consumable electrode arc melting processes, ensuring that the chemical composition of the titanium alloy is fully uniform. By controlling the parameters of the vacuum consumable electrode arc melting process, the prepared secondary ingot can be directly used for plasma rotating electrode atomization powder production after simple processing, effectively improving material utilization and processing efficiency.

[0021] 3. By controlling the parameters of plasma rotating electrode atomization powder production, this invention achieves a powder recovery rate of over 90% for titanium alloy powder with a particle size of 20μm to 150μm, while also ensuring the quality of the titanium alloy powder. This allows the titanium alloy powder to be processed into a high-strength titanium alloy that combines strength and plasticity.

[0022] 4. This invention uses multi-stage heating and cooling heat treatment to cause the fine needle-like α phase generated during the additive manufacturing process in the titanium alloy sample to dissolve back during the heat treatment holding process. This causes the α phase to precipitate and grow discontinuously on and within the β grain boundaries, effectively ensuring the plastic strength of the titanium alloy. It also causes a large number of basketweave structures to precipitate in the titanium alloy sample, so that the strength of the titanium alloy is significantly improved while ensuring that the plasticity is not lower than the engineering requirements, i.e., the elongation is not lower than 5%.

[0023] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0024] Figure 1 This is a low-magnification microstructure of a high-strength titanium alloy part that combines strength and plasticity prepared in Example 1 of this invention.

[0025] Figure 2 This is a high-magnification microstructure image of a high-strength titanium alloy part that combines strength and plasticity prepared in Example 1 of this invention.

[0026] Figure 3This is a low-magnification microstructure image of the titanium alloy part prepared in Comparative Example 1 of this invention.

[0027] Figure 4 This is a high-magnification microstructure image of the titanium alloy part prepared in Comparative Example 1 of this invention.

[0028] Figure 5 This is a low-magnification microstructure image of the titanium alloy part prepared in Comparative Example 2 of this invention.

[0029] Figure 6 This is a high-magnification microstructure image of the titanium alloy part prepared in Comparative Example 2 of this invention. Detailed Implementation

[0030] Example 1

[0031] This embodiment includes the following steps:

[0032] Step 1: The titanium alloy raw materials are batched according to the grade Ti-5Al-4Cr-4Mo-4V-3Zr and then melted once by vacuum consumable electrode arc to obtain a primary ingot with a mass of 10kg, a diameter of 90mm and a height of 320mm. Then, the two primary ingots are welded together and melted a second time by vacuum consumable electrode arc to obtain a secondary ingot with a mass of 20kg, a diameter of 120mm and a height of 380mm.

[0033] Step 2: The secondary ingot obtained in Step 1 is processed into a round bar with a diameter of 30mm and a metallic luster by hot working or machining, and the surface oxide scale is removed. Then, the round bar is subjected to plasma rotating electrode atomization powdering. The end face of the round bar is heated and melted by plasma arc and the powder is spun. The electrode rotation speed is 28000r / min, the current is 1300A, and the voltage is 50V. Finally, the powder is passed through a powder sieve to obtain titanium alloy powder with a particle size of 53μm~150μm.

[0034] Step 3: The titanium alloy powder obtained in Step 2 is subjected to electron beam additive manufacturing at a preheating temperature of 740℃, a scanning current of 16mA, and a scanning speed of 5m / s to obtain a titanium alloy sample.

[0035] Step 4: Heat the muffle furnace to 850℃, then place the titanium alloy sample obtained in Step 3 into the muffle furnace and hold it at that temperature for 1 hour. Then, cool it down to 750℃ with the furnace at a cooling rate of 0.5℃ / min. After that, remove the titanium alloy sample and air-cool it to room temperature. Then, heat the muffle furnace to 540℃, and then place the air-cooled titanium alloy sample into the muffle furnace and hold it at that temperature for 4 hours. Finally, air-cool it to obtain a high-strength titanium alloy part that combines strength and plasticity.

[0036] Comparative Example 1

[0037] This comparative example includes the following steps:

[0038] Step 1: The titanium alloy raw materials are batched according to the grade Ti-5Al-4Cr-4Mo-4V-3Zr and then melted once by vacuum consumable electrode arc to obtain a primary ingot with a mass of 10kg, a diameter of 90mm and a height of 320mm. Then, the two primary ingots are welded together and melted a second time by vacuum consumable electrode arc to obtain a secondary ingot with a mass of 20kg, a diameter of 120mm and a height of 380mm.

[0039] Step 2: The secondary ingot obtained in Step 1 is processed into a round bar with a diameter of 30mm and a metallic luster by hot working or machining, and the surface oxide scale is removed. Then, the round bar is subjected to plasma rotating electrode atomization powdering. The end face of the round bar is heated and melted by plasma arc and the powder is spun. The electrode rotation speed is 28000r / min, the current is 1300A, and the voltage is 50V. Finally, the powder is passed through a powder sieve to obtain titanium alloy powder with a particle size of 53μm~150μm.

[0040] Step 3: The titanium alloy powder obtained in Step 2 is subjected to electron beam additive manufacturing at a preheating temperature of 740℃, a scanning current of 16mA, and a scanning speed of 5m / s to obtain titanium alloy parts.

[0041] Comparative Example 2

[0042] Step 1: The titanium alloy raw materials are batched according to the grade Ti-5Al-4Cr-4Mo-4V-3Zr and then melted once by vacuum consumable electrode arc to obtain a primary ingot with a mass of 10kg, a diameter of 90mm and a height of 320mm. Then, the two primary ingots are welded together and melted a second time by vacuum consumable electrode arc to obtain a secondary ingot with a mass of 20kg, a diameter of 120mm and a height of 380mm.

[0043] Step 2: The secondary ingot obtained in Step 1 is processed into a round bar with a diameter of 30mm and a metallic luster by hot working or machining, and the surface oxide scale is removed. Then, the round bar is subjected to plasma rotating electrode atomization powdering. The end face of the round bar is heated and melted by plasma arc and the powder is spun. The electrode rotation speed is 28000r / min, the current is 1300A, and the voltage is 50V. Finally, the powder is passed through a powder sieve to obtain titanium alloy powder with a particle size of 53μm~150μm.

[0044] Step 3: The titanium alloy powder obtained in Step 2 is subjected to electron beam additive manufacturing at a preheating temperature of 740℃, a scanning current of 16mA, and a scanning speed of 5m / s to obtain a titanium alloy sample.

[0045] Step 4: Heat the muffle furnace to 760℃, then place the titanium alloy sample obtained in Step 3 into the muffle furnace and hold it at that temperature for 1 hour. Then remove the titanium alloy sample and air-cool it to room temperature. Next, heat the muffle furnace to 540℃, then place the air-cooled titanium alloy sample into the muffle furnace and hold it at that temperature for 4 hours. Finally, air-cool it to obtain the titanium alloy part.

[0046] The high-strength titanium alloy parts prepared in Example 1, which combine strength and plasticity, were compared with the titanium alloy parts prepared in Comparative Examples 1 and 2. The mechanical properties were tested, and the results are shown in Table 1.

[0047] Table 1

[0048] tensile strength elongation Example 1 1349±6MPa 7.3±0.9％ Comparative Example 1 1152±22MPa 13.8±1.3％ Comparative Example 2 1249±3MPa 9.0±1.2％

[0049] Based on the process treatments of Example 1, Comparative Example 1, and Comparative Example 2, compared to Example 1, Comparative Example 1 did not undergo a heat treatment process, while Comparative Example 2 adopted a different heat treatment regime. Therefore, the tensile strength of the final titanium alloy parts of Comparative Example 1 and Comparative Example 2 is lower than that of Example 1, and the requirement of balancing strength and plasticity cannot be achieved.

[0050] Figure 1 This is a low-magnification microstructure image of the high-strength titanium alloy part that combines strength and plasticity prepared in Example 1 of this invention. Figure 2 This is a high-magnification microstructure image of the high-strength titanium alloy part that combines strength and plasticity prepared in Example 1 of this invention. Figure 3 This is a low-magnification microstructure image of the titanium alloy part prepared in Comparative Example 1 of this invention. Figure 4 This is a high-magnification microstructure image of the titanium alloy part prepared in Comparative Example 1 of this invention. Figure 5 This is a low-magnification microstructure image of the titanium alloy part prepared in Comparative Example 2 of this invention. Figure 6 This is a high-magnification microstructure image of the titanium alloy part prepared in Comparative Example 2 of this invention. Figures 1-6 As can be seen from the data, the high-strength titanium alloy parts prepared in Example 1, which combine strength and plasticity, exhibit a fine lamellar structure within the grains and a coarser structure at the grain boundaries after specific heat treatment, forming a typical bipolar heterogeneous structure, thus achieving the requirement of balancing strength and plasticity. In contrast, the titanium alloy parts prepared in Comparative Example 1 show a coarser lamellar or acicular α-phase structure, indicating that the grains are relatively large and the structure has not been effectively refined, failing to meet the sample strength requirements. The titanium alloy parts prepared in Comparative Example 2 have a similar microstructure to Comparative Example 1, but the lamellar structure is finer, resulting in poor alloy plasticity, and similarly failing to achieve the requirement of balancing strength and plasticity.

[0051] Example 2

[0052] This embodiment includes the following steps:

[0053] Step 1: The titanium alloy raw materials are batched according to the grade Ti-5Al-4Cr-4Mo-4V-3Zr and then melted once by vacuum consumable electrode arc to obtain a primary ingot with a mass of 25kg, a cylindrical shape with a diameter of 120mm and a height of 500mm. Then, the two primary ingots are welded together and melted a second time by vacuum consumable electrode arc to obtain a secondary ingot with a mass of 50kg, a cylindrical shape with a diameter of 160mm and a height of 500mm.

[0054] Step 2: The secondary ingot obtained in Step 1 is processed into a round bar with a diameter of 75mm and a metallic luster by hot working or machining, and the surface oxide scale is removed. Then, the round bar is subjected to plasma rotating electrode atomization powdering. The end face of the round bar is heated and melted by plasma arc and the powder is spun. The electrode rotation speed is 20000r / min, the current is 1500A, and the voltage is 55V. Finally, the powder is passed through a powder sieve to obtain titanium alloy powder with a particle size of 20μm to 120μm.

[0055] Step 3: The titanium alloy powder obtained in Step 2 is subjected to electron beam additive manufacturing at a preheating temperature of 700℃, a scanning current of 10mA, and a scanning speed of 3m / s to obtain a titanium alloy sample.

[0056] Step 4: Heat the muffle furnace to 880℃, then place the titanium alloy sample obtained in Step 3 into the muffle furnace and hold it at that temperature for 1.5 hours. Then, cool it down to 730℃ with the furnace at a cooling rate of 0.1℃ / min. After that, remove the titanium alloy sample and air-cool it to room temperature. Then, heat the muffle furnace to 580℃, and then place the air-cooled titanium alloy sample into the muffle furnace and hold it at that temperature for 2 hours. Finally, air-cool it to obtain a high-strength titanium alloy part that combines strength and plasticity.

[0057] Example 3

[0058] This embodiment includes the following steps:

[0059] Step 1: The titanium alloy raw materials are batched according to the grade Ti-5Al-4Cr-4Mo-4V-3Zr and subjected to vacuum consumable electrode arc melting to obtain a primary ingot with a mass of 13kg, a diameter of 90mm and a height of 435mm. Then, the three primary ingots are welded together and subjected to vacuum consumable electrode arc melting to obtain a secondary ingot with a mass of 40kg, a diameter of 160mm and a height of 420mm.

[0060] Step 2: The secondary ingot obtained in Step 1 is processed into a round bar with a diameter of 50 mm and a metallic luster by hot working or machining, and the surface oxide scale is removed. Then, the round bar is subjected to plasma rotating electrode atomization powdering. The end face of the round bar is heated and melted by plasma arc and the powder is spun. The electrode rotation speed is 32000 r / min, the current is 1100A, and the voltage is 60V. Finally, the powder is passed through a powder sieve to obtain titanium alloy powder with a particle size of 30μm to 130μm.

[0061] Step 3: The titanium alloy powder obtained in Step 2 is subjected to electron beam additive manufacturing at a preheating temperature of 760℃, a scanning current of 17mA, and a scanning speed of 6m / s to obtain a titanium alloy sample.

[0062] Step 4: Heat the muffle furnace to 860℃, then place the titanium alloy sample obtained in Step 3 into the muffle furnace and hold it at that temperature for 2 hours. Then, cool it down to 700℃ with the furnace at a cooling rate of 0.3℃ / min. After that, remove the titanium alloy sample and air-cool it to room temperature. Then, heat the muffle furnace to 550℃, and then place the air-cooled titanium alloy sample into the muffle furnace and hold it at that temperature for 6 hours. Finally, air-cool it to obtain a high-strength titanium alloy part that combines strength and plasticity.

[0063] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention in any way. Any simple modifications, alterations, and equivalent changes made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A method for preparing high-strength titanium alloys with both high strength and ductility suitable for additive manufacturing processes, characterized in that, The method includes the following steps: Step 1: The titanium alloy raw material is melted once by vacuum consumable electrode arc to obtain a primary ingot. Then, two or three primary ingots are welded together and melted a second time by vacuum consumable electrode arc to obtain a secondary ingot. The titanium alloy raw material is prepared according to the composition Ti-5Al-4Cr-4Mo-4V-3Zr. Step 2: The secondary ingot obtained in Step 1 is processed into a round bar, and then the round bar is subjected to plasma rotating electrode atomization to obtain titanium alloy powder. In the plasma rotating electrode atomization process, the end face of the round bar is heated and melted by plasma arc to perform a powder spinning process. The rotation speed of the electrode is 20000r / min~32000r / min, the current is 1100A~1500A, and the voltage is 50V~60V. Then, titanium alloy powder with a particle size of 20μm~150μm is collected through a powder sieve. Step 3: The titanium alloy powder obtained in Step 2 is subjected to electron beam additive manufacturing to obtain a titanium alloy sample; the parameters of the electron beam additive manufacturing are: preheating temperature of 700℃~760℃, scanning current of 10mA~17mA, and scanning speed of 3m / s~6m / s. Step 4: Heat-treat the titanium alloy sample obtained in Step 3 to obtain a high-strength titanium alloy that combines strength and ductility. The heat treatment process is as follows: heat the muffle furnace to 850℃~880℃, then place the titanium alloy sample in the muffle furnace and hold it for 1h~2h. Then, cool it with the furnace at a cooling rate of 0.1℃ / min~0.5℃ / min to 700℃~750℃. After that, remove the titanium alloy sample and air-cool it to room temperature. Then, heat the muffle furnace to 500℃~580℃, then place the air-cooled titanium alloy sample in the muffle furnace and hold it for 2h~6h. Finally, air-cool it.

2. The method for preparing high-strength titanium alloys with both high strength and plasticity using additive manufacturing processes according to claim 1, characterized in that, The mass of the primary ingot in step one is 10kg~25kg, and the shape is a cylinder with a diameter of 90mm~120mm and a height of 320mm~500mm. The mass of the secondary ingot is 20kg~50kg, and the shape is a cylinder with a diameter of 120mm~160mm and a height of 320mm~500mm.

3. The method for preparing high-strength titanium alloys with both high strength and plasticity using additive manufacturing processes according to claim 1, characterized in that, The processing described in step two involves using hot working or machining to process the secondary casting ingot into a round bar with a metallic luster, the diameter of which is 30mm~75mm.

4. The method for preparing high-strength titanium alloys with both high strength and plasticity using additive manufacturing processes according to claim 1, characterized in that, The high-strength titanium alloy described in step four combines strength and plasticity, maintaining an elongation of more than 5% while having a tensile strength greater than 1300MPa.

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