Preparation method of titanium alloy cast ingot and titanium alloy

Abstract

The invention discloses a preparation method of a titanium alloy cast ingot, which comprises the following steps: mixing and extruding 15-16% by mass of multi-element vanadium alloy, 2-3% by mass of aluminum shots and 81-83% by mass of sponge titanium in a mold every time, and repeating for multiple times to obtain an electrode with a preset length; and the electrode is subjected to multiple times of VAR smelting in a vacuum consumable electric arc furnace, and a titanium alloy cast ingot is obtained. According to the scheme provided by the invention, the raw materials are extruded in batches by adopting a semi-continuous extrusion process, so that the titanium alloy integral consumable electrode containing the multi-element vanadium alloy is obtained, the distribution nonuniformity of more multi-element vanadium alloy in the raw material mixing process is avoided, and the uniform distribution of the multi-element vanadium alloy in the integral electrode is ensured.

Description

Technical Field

[0001] The present invention relates to the field of alloy preparation, and particularly to a method for preparing a titanium alloy ingot and a titanium alloy. Background Art

[0002] With the rapid development of high-end equipment such as aerospace, higher requirements have been put forward for the specific strength, specific stiffness and other comprehensive properties of titanium alloys for aerospace frame beam load-bearing structural parts, aircraft landing gears, etc. As a structural component, high-strength and tough titanium alloys are used in aerospace and other parts that require high strength and toughness, which can further improve the specific strength and specific stiffness of titanium alloys to achieve greater weight reduction. Among them, TC18, as a typical representative of high-strength and tough titanium alloys, is widely used in aircraft landing gears and key main load-bearing structural parts of aircraft frame beams. This alloy has good corrosion resistance. In the annealed state, the structure has approximately equal amounts of α-phase and β-phase, and the strength can reach more than 1080 MPa. It is one of the titanium alloys with the highest strength in the annealed state. After annealing, it has good welding performance, and the maximum working temperature can reach 400°C. At the same time, the TC18 alloy can be quenched through a cross-sectional thickness of up to 250 mm, which is particularly suitable for manufacturing large load-bearing structural parts on the aircraft fuselage and landing gears. Replacing high-strength steel or Ti6Al4V alloy with TC18 titanium alloy in the aircraft structure can reduce the weight by 15% - 20%. This alloy is generally used in the double-annealed state, and can also be strengthened by solution aging. Its main semi-finished products include plates, bars, tubes, fasteners, extruded profiles and forgings, etc. Due to the good comprehensive mechanical properties of TC18, it is expected to exceed TC4 and become the mainstream titanium alloy with wider application in the future. At present, domestic titanium alloy enterprises mainly produce TC18 by adding vanadium-aluminum, aluminum-molybdenum, metal chromium, ferrotitanium and aluminum beans respectively to meet the composition requirements. Since the shapes and physical and chemical properties of the added alloys are different, it is not easy to control the uniformity of the melting composition, and the composition of the titanium alloy ingot fluctuates greatly. In addition, the melting, forging and heat treatment processes of TC18 titanium alloy are relatively complex, resulting in a high production cost of TC18, which seriously restricts the popularization and application of TC18. Summary of the Invention

[0003] In view of this, in order to overcome at least one of the above problems, an embodiment of the present invention provides a method for preparing a titanium alloy ingot, including the following steps: Each time, a multi-element vanadium alloy with a mass percentage of 15 - 16%, 2 - 3% of aluminum beans, and 81 - 83% of sponge titanium are mixed and extruded in a mold. After repeating multiple times, an electrode with a preset length is obtained; The electrode is subjected to multiple VAR smelting in a vacuum consumable arc furnace to obtain a titanium alloy ingot.

[0004] In some embodiments, subjecting the electrode to multiple VAR smelting in a vacuum consumable arc furnace to obtain a titanium alloy ingot further includes: Stir the molten pool with a first alternating magnetic field generated by a stable arc current in a first direction; Stop stirring after stirring for a preset time period; After a preset duration, stir the molten pool with a second alternating magnetic field generated by a stable arc current in a second direction; Stop stirring after stirring for a preset time period, and after a preset duration, return to the step of stirring the molten pool with a first alternating magnetic field generated by a stable arc current in a first direction.

[0005] In some embodiments, the magnitude of the stable arc current in the first direction and / or the stable arc current in the second direction is 5 - 8 A; The preset time period is 3 - 5 S; The preset duration is 2 - 5 S.

[0006] In some embodiments, each time a multi - element vanadium alloy with a mass percentage of 15 - 16%, 2 - 3% aluminum beans, and 81 - 83% titanium sponge are mixed and extruded in a mold, it further includes: Wrap the multi - element vanadium alloy with aluminum foil to form a multi - element vanadium alloy package; Mix multiple said multi - element vanadium alloy packages, the aluminum beans, and the titanium sponge evenly in the mold.

[0007] In some embodiments, the number of the multi - element vanadium alloy packages is 10 - 30, and the weight of each multi - element vanadium alloy package is 300 - 400 g.

[0008] In some embodiments, mixing multiple multi - element vanadium alloy packages, the aluminum beans, and the titanium sponge evenly in the mold further includes: Place multiple said multi - element vanadium alloy packages evenly into the mold; Mix the aluminum beans and the titanium sponge evenly and then put them into the mold.

[0009] In some embodiments, it further includes: Perform extrusion under an extrusion pressure of 6000 - 8000 tons and an extrusion speed of 20 - 40 mm / s.

[0010] In some embodiments, obtaining a titanium alloy ingot by performing multiple VAR smelts in an electrode vacuum consumable arc furnace further includes: Perform 3 VAR smelts on the electrode in the electrode vacuum consumable arc furnace, wherein for each smelt, control the vacuum degree before smelting < 1 Pa, the vacuum degree during smelting ≤ 1.33 Pa, and the smelting speed is 10 - 15 kg / min.

[0011] In some embodiments, the multi - element vanadium alloy is a five - element vanadium alloy of Mo35 - V35 - Cr8 - Fe8 - Al.

[0012] Based on the same inventive concept, the present application also provides a titanium alloy, which is prepared by the method described in any of the above embodiments.

[0013] One of the beneficial technical effects of the present invention is as follows: By adopting a semi - continuous extrusion process to extrude the raw materials in batches, the present invention obtains a titanium alloy integral consumable electrode containing a multi - element vanadium alloy, avoiding the uneven distribution of a large amount of multi - element vanadium alloy during the raw material mixing process, and ensuring the uniform distribution of the multi - element vanadium alloy in the integral electrode. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other embodiments can be obtained based on these drawings.

[0015] Figure 1 It is a schematic flow chart of the preparation method of the titanium alloy ingot provided by the embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will further describe the embodiments of the present invention in detail with reference to specific embodiments and the accompanying drawings.

[0017] It should be noted that all the expressions using "first" and "second" in the embodiments of the present invention are used to distinguish two non - identical entities or non - identical parameters with the same name. It can be seen that "first" and "second" are only for the convenience of expression and should not be construed as a limitation on the embodiments of the present invention. This will not be elaborated in the subsequent embodiments one by one.

[0018] According to one aspect of the present invention, an embodiment of the present invention provides a method for preparing a titanium alloy ingot, as Figure 1 shown, which may include the steps: Each time, mix 15 - 16% by mass of a multi - element vanadium alloy, 2 - 3% of aluminum beans, and 81 - 83% of titanium sponge in a mold and extrude them. After repeating multiple times, an electrode with a preset length is obtained; Perform multiple VAR smelting operations on the electrode in a vacuum consumable arc furnace to obtain a titanium alloy ingot.

[0019] By adopting a semi - continuous extrusion process to extrude the raw materials in batches, the present invention obtains a titanium alloy integral consumable electrode containing a multi - element vanadium alloy, avoiding the uneven distribution of a large amount of multi - element vanadium alloy during the raw material mixing process, and ensuring the uniform distribution of the multi - element vanadium alloy in the integral electrode.

[0020] In some embodiments, a titanium alloy ingot is obtained by performing multiple VAR smelting processes in an electrode vacuum consumable arc furnace, which further includes: Stirring the molten pool with a first alternating magnetic field generated by a stabilizing arc current in a first direction; Stopping the stirring after a preset time period; Stirring the molten pool with a second alternating magnetic field generated by a stabilizing arc current in a second direction after a preset time duration; Stopping the stirring after a preset time period, and returning to the step of stirring the molten pool with the first alternating magnetic field generated by the stabilizing arc current in the first direction after a preset time duration.

[0021] Specifically, the stabilizing arc current is usually carried out using a DC or AC magnetic field. However, due to the inertial motion during the Lorentz force stirring process, the liquid level of the molten pool is unstable, resulting in uneven composition of the ingot and poor surface quality of the ingot. The embodiments of the present invention adopt a smelting process of "constant melting rate" to keep the depth of the molten pool of the ingot relatively constant, and stir the molten pool with the Lorentz force generated by the alternating magnetic field generated by the stabilizing arc current. After stirring for a preset time period, pause for 2 - 5 seconds, change the current direction, generate a second alternating magnetic field, and stir the molten pool with the Lorentz force generated by the second alternating magnetic field. After stirring for a preset time period, pause for 2 - 5 seconds, and repeat multiple times. This can weaken the confinement of the arc light, evenly distribute it to the entire liquid surface of the molten pool, reduce the temperature gradient at different positions of the molten pool, and reduce the area of the solid-liquid two-phase region of the molten pool, thereby obtaining a relatively uniform TC18 high-strength and tough titanium alloy ingot.

[0022] Compared with the TC18 high-strength and tough titanium alloy ingot produced by the traditional method of adding multiple vanadium alloys, the TC18 high-strength and tough titanium alloy ingot produced by the method of the present invention significantly reduces the problems of inclusion and segregation of components, and the obtained ingot has a more uniform composition.

[0023] In some embodiments, the magnitude of the stabilizing arc current in the first direction and / or the stabilizing arc current in the second direction is 5 - 8 A; The preset time period is 3 - 5 s; The preset time duration is 2 - 5 s.

[0024] In some embodiments, each time a multi-element vanadium alloy with a mass percentage of 15 - 16%, 2 - 3% of aluminum beans, and 81 - 83% of sponge titanium are mixed and extruded in a mold, which further includes: Wrapping the multi-element vanadium alloy with aluminum foil to form a multi-element vanadium alloy package; Mixing a plurality of the multi-element vanadium alloy packages, the aluminum beans, and the sponge titanium evenly in the mold.

[0025] In some embodiments, the number of the multi-element vanadium alloy packages is 10 to 30, and the weight of each multi-element vanadium alloy package is 300 - 400 g.

[0026] In some embodiments, mixing a plurality of multi-element vanadium alloy packages, the aluminum beans, and the titanium sponge evenly in the mold further includes: Placing a plurality of the multi-element vanadium alloy packages evenly into the mold; After mixing the aluminum beans and the titanium sponge evenly, putting them into the mold.

[0027] In some embodiments, the multi-element vanadium alloy is a five-element vanadium alloy of Mo35-V35-Cr8-Fe8-Al.

[0028] Specifically, by adding the multi-element vanadium alloy Al-Mo-V-Cr-Fe five-element alloy in batches, wrapping the multi-element vanadium alloy with aluminum foil (the weight of each aluminum-foil-wrapped multi-element vanadium alloy is 300 - 400 g, and the number is 10 - 30), manually putting the aluminum-foil-wrapped multi-element vanadium alloy packages into the groove at the core of the extrusion mold first, and then automatically pouring the evenly mixed remaining raw materials into the mold cylinder, controlling the weight of the raw materials per batch at 40 - 50 kg, and adopting a semi-continuous extrusion process to obtain a titanium alloy integral consumable electrode containing the multi-element vanadium alloy.

[0029] In some embodiments, it further includes: Extruding under an extrusion pressure of 6000 - 8000 tons and an extrusion speed of 20 - 40 mm / s.

[0030] Specifically, putting the raw materials with a single feeding weight (40 - 50 kg) into the mold cylinder, extruding the raw materials by adopting a semi-continuous extrusion process, controlling the extrusion pressure at 6000 - 8000 tons and the extrusion speed at 20 - 40 mm / s, so as to obtain a TC18 high-strength and tough titanium alloy integral consumable electrode; In some embodiments, performing multiple VAR smelting on the electrode in a vacuum consumable arc furnace further includes: Performing 3 times of VAR smelting on the electrode in the vacuum consumable arc furnace, wherein for each smelting, controlling the vacuum degree before smelting < 1 Pa, the vacuum degree during smelting ≤ 1.33 Pa, and the smelting speed at 10 - 15 kg / min.

[0031] Specifically, during the smelting process, a smelting process of "constant melting rate" is adopted. By controlling the stability of the melting speed, the relative constancy of the ingot molten pool depth is maintained. An alternating magnetic field is applied to the arc stabilizing current, and the molten pool is stirred forward and backward with a 2 - 5 - second pause in the middle, thereby obtaining a high-strength and tough titanium alloy ingot with uniform composition. The pressed integral electrode of TC18 high-strength and tough titanium alloy can be transferred to a vacuum consumable arc furnace for 3 times of VAR smelting. Each time of smelting, the pre-melting vacuum degree is controlled to be < 1 Pa, and the in-melting vacuum degree is ≤ 1.33 Pa. During the finished product smelting, the melting speed is strictly controlled at 10 - 15 kg / min, and a 5 - 8 A forward and reverse arc stabilizing current is used to stir the molten pool, with each current lasting for 3 - 5 S (a 2 - 5 - second pause in the middle of forward and reverse rotation).

[0032] Example 1 Prepare the electrode using a five - element intermediate alloy of Mo35 - V35 - Cr8 - Fe8 - Al with a mass percentage of 15%, 2% of high - purity aluminum beans, and 83% of titanium sponge: Wrap the five - element intermediate alloy with high - purity aluminum foil into five - element vanadium alloy packages. The weight of each multi - element vanadium alloy package is controlled at 300 g, and the number is 20. Use the manual feeding method to put them into the groove position in the extrusion die barrel, and then mix the remaining raw materials such as titanium sponge and aluminum beans evenly and put them into the die barrel. The weight of the raw materials for each single time is controlled at 40 kg.

[0033] Put the raw materials with the weight of each single feeding into the die barrel, and extrude the raw materials using a semi - continuous extrusion process, controlling the extrusion pressure at 6000 tons and the extrusion speed at 20 mm / s, thereby obtaining an integral consumable electrode of TC18 high - strength and tough titanium alloy; Transfer the pressed integral electrode of TC18 high - strength and tough titanium alloy to a vacuum consumable arc furnace for 3 times of VAR smelting. Each time of smelting, the pre - melting vacuum degree is controlled to be < 1 Pa, and the in - melting vacuum degree is ≤ 1.33 Pa. During the finished product smelting, the melting speed is strictly controlled at 10 - 15 kg / min, and a 5 A forward and reverse arc stabilizing current is used to stir the molten pool, with each current lasting for 3 S (a 2 - second pause in the middle of forward and reverse rotation), obtaining a stable finished product molten pool, thereby obtaining a TC18 high - strength and tough titanium alloy ingot with uniform composition.

[0034] Example 2 Prepare the electrode using a five - element intermediate alloy of Mo35 - V35 - Cr8 - Fe8 - Al with a mass percentage of 15.5%, 2.5% of high - purity aluminum beans, and 82% of titanium sponge: Wrap the five - element intermediate alloy with high - purity aluminum foil into five - element vanadium alloy packages. The weight of each multi - element vanadium alloy package is controlled at 350 g, and the number is 10. Use the manual feeding method to put them into the groove position in the extrusion die barrel, and then mix the remaining raw materials such as titanium sponge and aluminum beans evenly and put them into the die barrel. The weight of the raw materials for each single time is controlled at 40 kg.

[0035] Put the raw materials with a single feeding weight into the die barrel, and extrude the raw materials using a semi - continuous extrusion process, controlling the extrusion pressure at 6000 tons and the extrusion speed at 20 mm / s to obtain a TC18 high - strength and tough titanium alloy integral consumable electrode; Transfer the pressed TC18 high - strength and tough titanium alloy integral electrode to a vacuum consumable arc furnace for 3 times of VAR melting. Each time of melting, control the vacuum degree before melting < 1 Pa and the vacuum degree during melting ≤ 1.33 Pa. During the final product melting, strictly control the melting speed at 10 - 15 kg / min, and use a 5A forward - reverse stable arc current to stir the molten pool. Each current lasts for 3S (with a 2 - second pause between forward and reverse rotations) to obtain a stable final product molten pool, thereby obtaining a TC18 high - strength and tough titanium alloy ingot with uniform composition.

[0036] Example 3 Prepare the electrode using a Mo35 - V35 - Cr8 - Fe8 - Al five - element master alloy with a mass percentage of 16%, 3% high - purity aluminum beans, and 81% titanium sponge: Wrap the five - element master alloy with high - purity aluminum foil into five - element vanadium alloy packages. The weight of each multi - element vanadium alloy package is controlled at 400 g, and the number is 30. Use the manual feeding method to put them into the groove position in the extrusion die barrel, and then mix the remaining raw materials such as titanium sponge and aluminum beans evenly and put them into the die barrel. The single - time raw material weight is controlled at 40 kg.

[0037] Put the raw materials with a single feeding weight into the die barrel, and extrude the raw materials using a semi - continuous extrusion process, controlling the extrusion pressure at 7000 tons and the extrusion speed at 30 mm / s to obtain a TC18 high - strength and tough titanium alloy integral consumable electrode; Transfer the pressed TC18 high - strength and tough titanium alloy integral electrode to a vacuum consumable arc furnace for 3 times of VAR melting. Each time of melting, control the vacuum degree before melting < 1 Pa and the vacuum degree during melting ≤ 1.33 Pa. During the final product melting, strictly control the melting speed at 10 - 15 kg / min, and use a 7A forward - reverse stable arc current to stir the molten pool. Each current lasts for 4S (with a 3 - second pause between forward and reverse rotations) to obtain a stable final product molten pool, thereby obtaining a TC18 high - strength and tough titanium alloy ingot with uniform composition.

[0038] Example 3 Prepare the electrode using a Mo35 - V35 - Cr8 - Fe8 - Al five - element master alloy with a mass percentage of 15.6%, 3% high - purity aluminum beans, and 80% titanium sponge: Wrap the quinary master alloy with high-purity aluminum foil to form a quinary vanadium alloy package. The weight of each multi-element vanadium alloy package is controlled at 300 g, and the quantity is 20. Feed them into the groove position in the extrusion die barrel manually, and then mix the remaining raw materials such as titanium sponge and aluminum beans evenly and feed them into the die barrel. The weight of the raw materials for each single feed is controlled at 40 kg.

[0039] Feed the raw materials with the weight of each single feed into the die barrel, and extrude the raw materials by semi-continuous extrusion process, controlling the extrusion pressure at 8000 tons and the extrusion speed at 40 mm / s, so as to obtain the integral consumable electrode of TC18 high-strength and tough titanium alloy; Transfer the pressed integral electrode of TC18 high-strength and tough titanium alloy to a vacuum consumable arc furnace for 3 times of VAR melting. During each melting, control the vacuum degree before melting < 1 Pa and the vacuum degree during melting ≤ 1.33 Pa. During the finished product melting, strictly control the melting speed at 10 - 15 kg / min, and use a positive and negative stable arc current of 8 A to stir the molten pool. Each current lasts for 5 s (pause for 5 seconds between positive and negative reversals) to obtain a stable finished product molten pool, so as to obtain a TC18 high-strength and tough titanium alloy ingot with uniform composition.

[0040] The solution proposed by the present invention wraps the master alloy containing high-melting-point element Mo and easily segregating elements Cr / Fe with aluminum foil and places it at the center position of the electrode cross-section. During the melting process, the arc temperature at the center of the electrode is the highest, so as to fully melt the high-melting-point and easily segregating elements, thus avoiding metallurgical defects such as inclusions during the melting process of high-melting-point and easily segregating Mo / Cr / Fe elements in the high-strength and tough titanium alloy; secondly, during the melting process, by adopting the "constant melting speed" melting process, the good microstructure and mechanical properties of the high-strength and tough titanium alloy are ensured.

[0041] Based on the same inventive concept, this application also proposes a titanium alloy, which is prepared based on the following method: Mix 15 - 16% of multi-element vanadium alloy, 2 - 3% of aluminum beans, and 81 - 83% of titanium sponge in a mold and extrude them each time. After repeating many times, an electrode with a preset length is obtained; Perform multiple VAR meltings on the electrode in a vacuum consumable arc furnace to obtain a titanium alloy ingot.

[0042] In some embodiments, performing multiple VAR meltings on the electrode in a vacuum consumable arc furnace to obtain a titanium alloy ingot further includes: Stir the molten pool with a first alternating magnetic field generated by a stable arc current in the first direction; Stop stirring after stirring for a preset period of time; Stir the molten pool with a second alternating magnetic field generated by a stable arc current in the second direction after a preset time; Stop stirring after the preset time period, and return to the step of stirring the molten pool with the first alternating magnetic field generated by the stable arc current in the first direction after the preset duration.

[0043] In some embodiments, the magnitude of the stable arc current in the first direction and / or the stable arc current in the second direction is 5 - 8 A; The preset time period is 3 - 5 s; The preset duration is 2 - 5 s.

[0044] In some embodiments, each time a multi-element vanadium alloy with a mass percentage of 15 - 16%, 2 - 3% aluminum beans, and 81 - 83% titanium sponge are mixed and extruded in a mold, it further includes: Wrapping the multi-element vanadium alloy with aluminum foil to form a multi-element vanadium alloy package; Mixing multiple said multi-element vanadium alloy packages, the aluminum beans, and the titanium sponge evenly in the mold.

[0045] In some embodiments, the number of the multi-element vanadium alloy packages is 10 - 30, and the weight of each multi-element vanadium alloy package is 300 - 400 g.

[0046] In some embodiments, mixing multiple multi-element vanadium alloy packages, the aluminum beans, and the titanium sponge evenly in the mold further includes: Placing multiple said multi-element vanadium alloy packages evenly into the mold; Mixing the aluminum beans and the titanium sponge evenly and then putting them into the mold.

[0047] In some embodiments, it further includes: Extruding under an extrusion pressure of 6000 - 8000 tons and an extrusion speed of 20 - 40 mm / s.

[0048] In some embodiments, obtaining a titanium alloy ingot by performing multiple VAR smelts in an electrode vacuum consumable arc furnace further includes: Performing 3 VAR smelts on the electrode in the electrode vacuum consumable arc furnace, where for each smelt, the vacuum degree before smelting is controlled to be < 1 Pa, the vacuum degree during smelting is ≤ 1.33 Pa, and the smelting speed is 10 - 15 kg / min.

[0049] In some embodiments, the multi-element vanadium alloy is a five-element vanadium alloy of Mo35-V35-Cr8-Fe8-Al.

[0050] The above are the exemplary embodiments disclosed by the present invention. However, it should be noted that various changes and modifications can be made without departing from the scope of the embodiments disclosed by the present invention as defined by the claims. The functions, steps, and / or actions of the method claims according to the disclosed embodiments herein do not need to be performed in any specific order. In addition, although the elements disclosed in the embodiments of the present invention can be described or claimed in individual form, they can also be understood as plural unless explicitly limited to the singular form.

[0051] It should be understood that, as used herein, unless the context clearly supports exceptions, the singular form "a" is also intended to include the plural form. It should also be understood that the "and / or" used herein refers to any and all possible combinations including one or more of the associated listed items.

[0052] The serial numbers of the disclosed embodiments of the present invention above are only for description and do not represent the superiority or inferiority of the embodiments.

[0053] Those of ordinary skill in the art should understand that: the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the disclosure of the embodiments of the present invention (including the claims) is limited to these examples; under the concept of the embodiments of the present invention, the technical features between the above embodiments or different embodiments can also be combined, and there are many other variations in different aspects of the embodiments of the present invention as above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the embodiments of the present invention shall be included within the protection scope of the embodiments of the present invention.

Claims

1. A method for preparing a titanium alloy ingot, characterized in that: The following steps are involved: Each time, 15-16% of multi-component vanadium alloy, 2-3% of aluminum beans, and 81-83% of titanium sponge are mixed and extruded in a mold, and after repeated multiple times, an electrode of a preset length is obtained; The titanium alloy ingot is obtained by performing multiple VAR melting in the electrode vacuum consumable arc furnace.

2. The method according to claim 1, characterized in that The method further comprises: performing multiple VAR smelting in an electrode vacuum consumable arc furnace to obtain a titanium alloy ingot. Stirring the molten pool by using a first alternating magnetic field generated by an arc stabilizing current in a first direction; Stop stirring after a preset period of time; After a preset time, the molten pool is stirred by using a second alternating magnetic field generated by a stabilizing arc current in a second direction; After stirring for a preset time period, stirring is stopped, and after a preset time, the step of stirring the molten pool by using a first alternating magnetic field generated by a stable arc current in a first direction is returned to.

3. The method according to claim 2, characterized in that The magnitude of the arc stabilizing current in the first direction and / or the arc stabilizing current in the second direction is 5-8A; The preset time period is 3-5S; The default duration is 2-5S.

4. The method according to claim 1, characterized in that Each time, 15-16% by mass of multi-component vanadium alloy, 2-3% by mass of aluminum beans, and 81-83% by mass of titanium sponge are mixed and extruded in a mold, further comprising: Wrapping the multinary vanadium alloy into a multinary vanadium alloy package using aluminum foil; A plurality of the multi-component vanadium alloy packages, the aluminum beans, and the titanium sponge are uniformly mixed in the mold.

5. The method according to claim 4, characterized in that The number of the multi-component vanadium alloy packages is 10 to 30, and the weight of each multi-component vanadium alloy package is 300 to 400 g.

6. The method according to claim 4, characterized in that The method further comprises: mixing a plurality of multi-component vanadium alloy packages, the aluminum beans, and the titanium sponge uniformly in the mold; Evenly placing a plurality of the multi-component vanadium alloy packages into a mold; The aluminum beans and the titanium sponge are mixed evenly and then put into the mold.

7. The method according to claim 4, characterized in that Also includes: The extrusion is carried out at an extrusion pressure of 6000~8000 tons and an extrusion speed of 20~40mm / s.

8. The method according to claim 1, characterized in that The method further comprises: performing multiple VAR smelting in an electrode vacuum consumable arc furnace to obtain a titanium alloy ingot. The electrode is subjected to three VAR smeltings in a vacuum consumable arc furnace, wherein each smelting is controlled such that the vacuum degree before smelting is less than 1 Pa, the vacuum degree during smelting is less than 1.33 Pa, and the smelting speed is 10-15 kg / min.

9. The method according to claim 1, characterized in that The multi-element vanadium alloy is a five-element vanadium alloy of Mo35-V35-Cr8-Fe8-Al.

10. A titanium alloy, characterized in that: The titanium alloy is prepared based on the method according to any one of claims 1 to 9.

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