Method for regulating and controlling yield ratio of TB13 titanium alloy wire and TB13 titanium alloy wire

Abstract

The invention discloses a method for regulating and controlling the yield ratio of a TB13 titanium alloy wire and the TB13 titanium alloy wire, and belongs to the technical field of titanium alloy machining. In order to realize regulation and control of the yield ratio of a beta-type TB13 titanium alloy wire, the invention provides a method for regulating and controlling the yield ratio of the TB13 titanium alloy wire, and the method comprises the following steps: sequentially carrying out cold drawing rounding, scaling, drawing, intermediate pass heat treatment and annealing on a TB13 titanium alloy disc with the diameter phi of 8.5-9.5 mm. According to the method, a roller die cold drawing deformation machining mode is adopted, different intermediate pass annealing treatment and finished product annealing treatment processes are combined, the number, form and distribution of alpha phases separated out in a beta matrix are changed, separated-out alpha-phase particles can interact with dislocation, dislocation slippage motion resistance is increased in the material deformation process, and the mechanical property of the material is improved. And thus, the yield strength, the tensile strength and the yield ratio of the finished beta-type TB13 wire are effectively regulated and controlled.

Description

Technical Field

[0001] The invention belongs to the technical field of titanium alloy processing, and in particular relates to a method for regulating the yield strength ratio of a TB13 titanium alloy wire and the TB13 titanium alloy wire. Background Art

[0002] TB13 titanium alloy (Ti-4Al-22V) is a β-type titanium alloy material with comprehensive excellent properties. It has high strength, good corrosion resistance and excellent cold working formability. It is widely used in chemical, biomedical and high-end civilian fields. The final products of this β-titanium alloy wire are mostly cold-formed parts, and the yield ratio (that is, the ratio of yield strength to tensile strength) is a key parameter in plastic processing. The design of low yield ratio can optimize the formability of the material, so that the material can be more easily deformed and less prone to cracks or fractures during complex cold working processes, while the higher yield ratio can effectively reduce the amount of material used while ensuring sufficient strength, thereby achieving lightweight design. Therefore, precisely controlling the yield ratio of TB13 titanium alloy is one of the key technologies to achieve diversified product applications and meet the needs of different service conditions.

[0003] In recent years, the application field of TB13 wire coils has been continuously expanded, and its market demand has been increasing year by year. The amount required for the domestic eyeglass frame manufacturing industry alone has reached more than 500 tons per year. Since different parts of the eyeglass frame (such as temples, frames, and nose pads) require different TB13 wire properties according to subsequent processing conditions, TB13 wire raw materials with different yield ratios are urgently needed. Therefore, regulating the yield ratio of TB13 titanium alloy to achieve diversified product applications has become one of the key technologies, and this technology has broad application prospects.

[0004] The main methods for regulating the yield strength ratio of β titanium alloys include alloying, heat treatment, machining, etc. When the alloy composition and machining process are fixed, heat treatment is a relatively economical and effective way to adjust the material's organizational morphology and thus change the material's yield strength ratio. 2 The method of adjusting the yield strength ratio of AlNb-based alloys is to perform different solid solution + aging heat treatments on the forging blanks of the near-α-type titanium alloy, thereby changing the morphology and quantity of the primary α and secondary α phase laths in the organization, thereby adjusting the yield strength ratio. However, for the TB13 wire coils used for production, they are all single equiaxed β grain structures at room temperature, with an α content of less than 1% and a yield strength ratio as high as 0.94. It is impossible to significantly adjust its yield strength ratio through conventional heat treatment alone, and the product application scenarios are limited.

[0005] At present, there is no report on the method for regulating the yield strength ratio of β-type TB13 titanium alloy wire. Therefore, it is necessary to develop a new process to regulate the yield strength ratio of TB13 titanium alloy wire. Summary of the invention

[0006] In view of the above problems, the present invention has developed a method for regulating the yield strength ratio of TB13 titanium alloy wire. The method adopts a deformation processing method of roller die cold drawing, combined with different intermediate annealing treatments and finished product annealing treatments, to control the precipitation, morphology and content of the α phase in the material, and then adjust the yield strength, tensile strength and yield strength ratio of the TB13 finished wire.

[0007] Based on the above purpose, the present invention provides a method for regulating the yield strength ratio of TB13 titanium alloy wire, which comprises the following steps:

[0008] A. Select TB13 titanium alloy disc; the specifications of the TB13 titanium alloy disc are

[0009] B. Rounding and peeling: The TB13 titanium alloy disc in step A is cold-drawn and rounded using a fixed die. The wire size after rounding is Then the rounded wire is peeled, and the size of the wire after peeling is

[0010] C. Drawing and intermediate heat treatment: The peeled wire obtained in step B is subjected to roller die drawing, the drawing line speed is 1-5 m / s, the single-pass diameter reduction is 0.5±0.05 mm, and after every two drawing passes, intermediate vacuum heat treatment and oil cooling are performed, for a total of 6 passes to obtain a drawn wire; in step C, during the intermediate vacuum heat treatment, the heating rate is 5°C-10°C / min, and the holding temperature is 650-730°C;

[0011] D. Finished product annealing process: The drawn wire obtained in step C is subjected to finished product annealing at a temperature of 700-750°C. After annealing, the wire is cooled to obtain a finished product having a size of Finished TB13 titanium alloy wire.

[0012] Among them, in the above-mentioned method for regulating the yield ratio of TB13 titanium alloy wire, in step A, the mass percentage content of the components of the TB13 titanium alloy is: Al 3.7±0.2wt%, V 22±0.2wt%, Fe<0.1wt%, C<0.03wt%, H<0.01wt%, O<0.12wt%, N<0.03wt%, Si<0.08wt%, P<0.01wt%, and the remainder is Ti and unavoidable impurities.

[0013] Among them, in the above-mentioned method for regulating the yield strength ratio of TB13 titanium alloy wire, in step A, the phase transition point of the TB13 titanium alloy disc is 730±5°C, and the metallographic structure is a uniform β-equiaxed structure.

[0014] Among them, in the above method for regulating the yield strength ratio of TB13 titanium alloy wire, in step A, the average grain size of the TB13 titanium alloy disc is 35-40 μm.

[0015] Preferably, in the above-mentioned method for regulating the yield ratio of TB13 titanium alloy wire, in step C, the drawing line speed of the first pass is 1.0-1.5 m / s, the drawing line speed of the second pass is 1.0-1.5 m / s, the drawing line speed of the third pass is 1.5-2.0 m / s, the drawing line speed of the fourth pass is 1.5-2.0 m / s, the drawing line speed of the fifth pass is 2.0-5.0 m / s, and the drawing line speed of the sixth pass is 2.0-5.0 m / s.

[0016] Among them, in the above method for regulating the yield strength ratio of TB13 titanium alloy wire, in step C, during the intermediate vacuum heat treatment, the holding time is 30 to 60 minutes.

[0017] In step C of the method of the present invention, the specific operation of the intermediate vacuum heat treatment and oil cooling is: after the first and second passes, the wire material is heated from room temperature to 650-730°C at 5°C-10°C / min, kept warm for 30-60 minutes, and then oil-cooled to room temperature, and the third and fourth passes are performed; after the third and fourth passes, the wire material is heated from room temperature to 650-730°C at 5°C-10°C / min, kept warm for 30-60 minutes, and then oil-cooled to room temperature, and the fifth and sixth passes are performed; after the fifth and sixth passes, the wire material is cleaned to obtain a drawn wire material.

[0018] Among them, in the above method for regulating the yield strength ratio of TB13 titanium alloy wire, in step C, during the roller die drawing process, the single-pass deformation amount gradually increases, and the maximum single-pass deformation amount is ≤18%.

[0019] Preferably, in the above-mentioned method for regulating the yield ratio of TB13 titanium alloy wire, in step C, the single pass deformation of the first pass is 12.11%, and the cumulative deformation is 12.11%, the single pass deformation of the second pass is 12.89%, and the cumulative deformation is 25.00%, the single pass deformation of the third pass is 13.78%, and the cumulative deformation is 38.77%, the single pass deformation of the fourth pass is 14.79%, and the cumulative deformation is 53.57%, the single pass deformation of the fifth pass is 15.97%, and the cumulative deformation is 69.54%, and the single pass deformation of the sixth pass is 17.36%, and the cumulative deformation is 86.89%.

[0020] Among them, in the above method for regulating the yield strength ratio of TB13 titanium alloy wire, in step C, during the roller die drawing process, a water-soluble lubricating liquid is used to lubricate the roller die and the wire.

[0021] Among them, in the above method for regulating the yield strength ratio of TB13 titanium alloy wire, in step D, during annealing, the wire feed speed is 2 to 4 m / min.

[0022] Among them, in the above method for regulating the yield strength ratio of TB13 titanium alloy wire, in step D, during annealing, the holding time is 5 to 10 minutes.

[0023] Among them, in the above method for regulating the yield ratio of TB13 titanium alloy wire, in step D, the cooling is air cooling, and the protective gas is a high-purity inert gas (commonly used argon).

[0024] The present invention also provides a TB13 titanium alloy wire, which is prepared by adopting a method for regulating the yield strength ratio of the TB13 titanium alloy wire.

[0025] The TB13 titanium alloy wire provided by the present invention has excellent yield strength, tensile strength and yield strength ratio, and the content of α phase and β phase is controllable. The yield strength is 678-708 MPa, the tensile strength is 719-812 MPa, the elongation after fracture is 23-27%, the cross-sectional shrinkage is 53-71%, the yield strength ratio is 0.867-0.950, the α phase content is 0.3%-18.6%, and the β phase content is 99.7-81.4%.

[0026] Beneficial effects of the present invention:

[0027] The present invention adopts a roller die cold drawing deformation processing method, combined with different intermediate annealing treatments and finished product annealing treatment processes, to change the amount, morphology and distribution of α phase precipitation in the β matrix in a targeted manner. The precipitated α phase particles will interact with dislocations, increase the resistance to dislocation slip movement during material deformation, and thus effectively regulate the yield strength, tensile strength and yield strength ratio of the finished β-type TB13 wire. The method of the present invention ensures that TB13 wire products can meet specific application scenarios, reduce the subsequent processing defect rate, improve user satisfaction, and have considerable economic benefits and technical display. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 The graph is a trend chart of the yield strength ratio of the TB13 wire obtained in Examples 1 to 3.

[0029] Figure 2 The cross-sectional microstructure metallographic images of the Φ5.0 mm TB13 wire obtained in Examples 1 to 3; wherein A and B are the low-high magnification metallographic structures of the wire in Example 1; C and D are the low-high magnification metallographic structures of the wire in Example 2; and E and F are the low-high magnification metallographic structures of the wire in Example 3. DETAILED DESCRIPTION

[0030] The present invention is further described in detail below by way of examples, but the protection scope of the present invention is not limited to the scope of the examples.

[0031] Example 1

[0032] (1) Select The TB13 titanium alloy disc is composed of Al 3.71wt%, V22.18wt%, Fe 0.063wt%, C 0.013wt%, H 0.0085wt%, O 0.098wt%, N 0.012wt%, Si0.052wt%, P 0.003wt%, and the balance is Ti and other impurities.

[0033] The phase transition point of the selected wire disc is 730°C, which is a uniformly distributed β equiaxed structure with an average grain size of ~38μm.

[0034] (2) Rounding and peeling: The coil in step 1 is cold-drawn and rounded using a fixed die to remove surface defects such as ear peeling and improve the roundness of the wire cross section, so as to reduce the loss in the subsequent peeling process. The size after rounding is The wire is peeled by a centerless grinding lathe to remove the oxide layer and defects on the surface, ensuring that the surface of the wire is smooth and convenient for subsequent wire drawing in the roller die. If the surface is not cleaned, the roller die will be damaged during the drawing process, and the surface quality of the wire will be reduced. The final size after peeling is

[0035] (3) Drawing and intermediate heat treatment: The wire obtained in step 2 is subjected to roller die drawing, and the diameter reduction per pass is 0.5 mm. Drawing reduction to The drawing line speed was controlled at 1.0 m / s, followed by a 680°C vacuum heat treatment and oil cooling, with a holding time of 60 min and a heating rate of 5°C / min.

[0036] After the first intermediate annealing, the wire is drawn by roller die for the 3rd to 4th time. Drawing reduction to The drawing line speed was controlled at 1.5 m / s, followed by a 680°C vacuum heat treatment and oil cooling, with a holding time of 60 min and a heating rate of 5°C / min.

[0037] After the second intermediate annealing, the 5th to 6th roller die drawing is carried out, and the wire is Drawing reduction to The drawing line speed was controlled at 2.0 m / s, and then the wire surface was cleaned.

[0038] Note that after each intermediate vacuum heat treatment, the oil on the wire surface needs to be cleaned before the next roller die drawing. During the entire drawing process, water-soluble lubricating liquid is used to lubricate the roller die and wire to reduce friction and protect the surface quality of the wire.

[0039] (4) Finished product annealing process: The drawn state obtained in step 3 is The wire is sent into the online annealing furnace for finished product annealing. The annealing temperature is selected as 700℃, the wire speed is selected as 2m / min, the holding time is 8min, the cooling method is air cooling, and the protective gas is high-purity argon. After annealing, the size is The finished wire has an α-phase content of 18.6% and a β-phase content of 81.4%.

[0040] The room temperature tensile properties and yield strength ratio of the Φ5.0 mm TB13 wire prepared in Example 1 are shown in Table 1. At the same time, the prepared wire samples were sampled for metallographic structure evaluation, and the results are shown in the attached Figure 2 As shown in (A, B), it can be seen that under the process conditions, a large number of fine α phases are uniformly precipitated in the equiaxed β grains in the cross section of the TB13 wire, accompanied by many twins. These precipitated phases and twin boundaries can effectively hinder dislocation movement, thereby improving the yield strength and tensile strength of the material, and then changing the yield strength ratio.

[0041] Table 1 Room temperature tensile properties and yield strength ratio of TB13 wire obtained in Example 1

[0042]

[0043]

[0044] Example 2

[0045] (1) Select The TB13 titanium alloy disc is composed of Al 3.71wt%, V22.18wt%, Fe 0.063wt%, C 0.013wt%, H 0.0085wt%, O 0.098wt%, N 0.012wt%, Si0.052wt%, P 0.003wt%, and the balance is Ti and other impurities.

[0046] The phase transition point of the selected wire disc is 730°C, which is a uniformly distributed β equiaxed structure with an average grain size of ~38μm.

[0047] (2) Rounding and peeling: The coil in step 1 is cold-drawn and rounded using a fixed die to remove surface defects such as ear peeling and improve the roundness of the wire cross section, so as to reduce the loss in the subsequent peeling process. The size after rounding is The wire is peeled by a centerless grinding lathe to remove the oxide layer and defects on the surface, ensuring that the surface of the wire is smooth and convenient for subsequent wire drawing in the roller die. If the surface is not cleaned, the roller die will be damaged during the drawing process, and the surface quality of the wire will be reduced. The final size after peeling is

[0048] (3) Drawing and intermediate heat treatment: The wire obtained in step 2 is subjected to roller die drawing, and the diameter reduction per pass is 0.5 mm. Drawing reduction to The drawing line speed was controlled at 1.5 m / s, followed by vacuum heat treatment at 705 °C and oil cooling, with a holding time of 60 min and a heating rate of 5 °C / min.

[0049] After the first intermediate annealing, the wire is drawn by roller die for the 3rd to 4th time. Drawing reduction to The drawing line speed was controlled at 2.0 m / s, followed by vacuum heat treatment at 705 °C and oil cooling, with a holding time of 60 min and a heating rate of 5 °C / min.

[0050] After the second intermediate annealing, the 5th to 6th roller die drawing is carried out, and the wire is Drawing reduction to The drawing line speed was controlled at 3.0 m / s, and then the wire surface was cleaned.

[0051] Note that after each intermediate vacuum heat treatment, the oil on the wire surface needs to be cleaned before the next roller die drawing. During the entire drawing process, water-soluble lubricating liquid is used to lubricate the roller die and wire to reduce friction and protect the surface quality of the wire.

[0052] (4) Finished product annealing process: The drawn state obtained in step 3 is The wire is sent into the online annealing furnace for finished product annealing. The annealing temperature is selected as 720℃, the wire speed is selected as 2m / min, the holding time is 8min, the cooling method is air cooling, and the protective gas is high-purity argon. After annealing, the size is The finished wire has an α-phase content of 8.2% and a β-phase content of 91.8%.

[0053] The room temperature tensile properties and yield strength ratio of the Φ5.0 mm TB13 wire prepared in Example 2 are shown in Table 2. At the same time, the metallographic structure of the prepared wire was evaluated by sampling. The results are shown in the attached figure. Figure 2 As shown in (C, D), it can be seen that under this process condition, α precipitation phase is precipitated in some β grains of the cross-sectional structure of TB13 wire, while only a small amount of β grains are precipitated in some other β grains. Compared with Example 1, the amount of α precipitation phase is reduced, and the hindering effect on dislocation is reduced. Therefore, the yield strength and tensile strength of the material are reduced, and the yield strength ratio is improved.

[0054] Table 2 Room temperature tensile properties and yield strength ratio of TB13 wire obtained in Example 2

[0055]

[0056] Example 3

[0057] (1) Select The TB13 titanium alloy disc is composed of Al 3.71wt%, V22.18wt%, Fe 0.063wt%, C 0.013wt%, H 0.0085wt%, O 0.098wt%, N 0.012wt%, Si0.052wt%, P 0.003wt%, and the balance is Ti and other impurities.

[0058] The phase transition point of the selected wire disc is 730°C, which is a uniformly distributed β equiaxed structure with an average grain size of ~38μm.

[0059] (2) Rounding and peeling: The coil in step 1 is cold-drawn and rounded using a fixed die to remove surface defects such as ear peeling and improve the roundness of the wire cross section, so as to reduce the loss in the subsequent peeling process. The size after rounding is The wire is peeled by a centerless grinding lathe to remove the oxide layer and defects on the surface, ensuring that the surface of the wire is smooth and convenient for subsequent wire drawing in the roller die. If the surface is not cleaned, the roller die will be damaged during the drawing process, and the surface quality of the wire will be reduced. The final size after peeling is

[0060] (3) Drawing and intermediate heat treatment: The wire obtained in step 2 is subjected to roller die drawing, and the diameter reduction per pass is 0.5 mm. Drawing reduction to The drawing line speed was controlled at 1.5 m / s, followed by vacuum heat treatment at 730 °C and oil cooling, with a holding time of 60 min and a heating rate of 5 °C / min.

[0061] After the first intermediate annealing, the wire is drawn by roller die for the 3rd to 4th time. Drawing reduction to The drawing line speed was controlled at 2.0 m / s, followed by vacuum heat treatment at 730 °C and oil cooling, with a holding time of 60 min and a heating rate of 5 °C / min.

[0062] After the second intermediate annealing, the 5th to 6th roller die drawing is carried out, and the wire is Drawing reduction to The drawing line speed was controlled at 3.0 m / s, and then the wire surface was cleaned.

[0063] Note that after each intermediate vacuum heat treatment, the oil on the wire surface needs to be cleaned before the next roller die drawing. During the entire drawing process, water-soluble lubricating liquid is used to lubricate the roller die and wire to reduce friction and protect the surface quality of the wire.

[0064] (4) Finished product annealing process: The drawn state obtained in step 3 is The wire is sent into the online annealing furnace for finished product annealing. The annealing temperature is selected as 740℃, the wire speed is selected as 2m / min, the holding time is 10min, the cooling method is air cooling, and the protective gas is high-purity argon. After annealing, the size is The finished wire has an α-phase content of 0.3% and a β-phase content of 99.7%.

[0065] The room temperature tensile properties and yield strength ratio of the Φ5.0 mm TB13 wire prepared in Example 3 are shown in Table 3. At the same time, the metallographic structure of the prepared wire was evaluated by sampling. The results are shown in the attached figure. Figure 2 As shown in (E, F), it can be seen that under this process condition, the cross-sectional organization of TB13 wire is a single equiaxed β grain, and no obvious α phase particles are seen in the grains. The crystal structure of the β phase is body-centered cubic, and the slip system is more than the hexagonal structure of the α phase, which is conducive to improving the plasticity of the material. Therefore, compared with Example 1 and Example 2, the yield strength and tensile strength of the material are reduced to a lower level, the plasticity is greatly improved, and the yield strength ratio is greatly increased.

[0066] Table 3 Room temperature tensile properties and yield strength ratio of TB13 wire obtained in Example 3

[0067]

[0068] The above are exemplary embodiments disclosed in the present invention, but it should be noted that various changes and modifications may be made without departing from the scope disclosed in the embodiments of the present invention as defined in the claims. The functions, steps and / or actions of the method claims according to the disclosed embodiments described herein do not need to be performed in any particular order. In addition, although the elements disclosed in the embodiments of the present invention may be described or required in individual form, they may also be understood as multiple unless explicitly limited to the singular.

Claims

1. A method for regulating the yield strength ratio of TB13 titanium alloy wire, characterized in that: The following steps are involved: A. Select a TB13 titanium alloy disc; the specification of the TB13 titanium alloy disc is φ8.5~9.5mm; B. Rounding and peeling: The TB13 titanium alloy disc in step A is cold-drawn and rounded by a fixed die, and the size of the wire after rounding is φ8.2-8.5 mm, and then the wire after rounding is peeled, and the size of the wire after peeling is φ8.0±0.1 mm; C. Drawing and intermediate heat treatment: The peeled wire obtained in step B is subjected to roller die drawing, the drawing line speed is 1-5 m / s, the single-pass diameter reduction is 0.5±0.05 mm, and after every two drawing passes, intermediate vacuum heat treatment and oil cooling are performed, for a total of 6 passes to obtain a drawn wire; in step C, during the intermediate vacuum heat treatment, the heating rate is 5°C-10°C / min, and the holding temperature is 650-730°C; D. Finished product annealing process: The drawn wire obtained in step C is subjected to finished product annealing at a temperature of 700-750° C. After annealing, the wire is cooled to obtain a finished product TB13 titanium alloy wire with a size of φ5.0±0.05 mm.

2. The method for regulating the yield ratio of TB13 titanium alloy wire according to claim 1, characterized in that: At least one of the following is met: In step A, the composition percentage by weight of the TB13 titanium alloy is: Al 3.7±0.2wt%, V 22±0.2wt%, Fe<0.1wt%, C<0.03wt%, H<0.01wt%, O<0.12wt%, N<0.03wt%, Si<0.08wt%, P<0.01wt%, and the balance is Ti and unavoidable impurities; In step A, the phase transition point of the TB13 titanium alloy disc is 730±5° C., and the metallographic structure is a uniform β-equiaxed structure; In step A, the average grain size of the TB13 titanium alloy disc is 35-40 μm.

3. The method for regulating the yield ratio of TB13 titanium alloy wire according to claim 1, characterized in that: In step C, the drawing line speed of the first pass is 1.0-1.5 m / s, the drawing line speed of the second pass is 1.0-1.5 m / s, the drawing line speed of the third pass is 1.5-2.0 m / s, the drawing line speed of the fourth pass is 1.5-2.0 m / s, the drawing line speed of the fifth pass is 2.0-5.0 m / s, and the drawing line speed of the sixth pass is 2.0-5.0 m / s.

4. The method for regulating the yield ratio of TB13 titanium alloy wire according to claim 1, characterized in that: In step C, during the intermediate vacuum heat treatment, the heat preservation time is 30 to 60 minutes.

5. The method for regulating the yield ratio of TB13 titanium alloy wire according to claim 1, characterized in that: In step C, during the roller die drawing process, the single-pass deformation amount gradually increases, and the maximum single-pass deformation amount is ≤18%; preferably, the single-pass deformation amount of the first pass is 12.11%, and the cumulative deformation amount is 12.11%, the single-pass deformation amount of the second pass is 12.89%, and the cumulative deformation amount is 25.00%, the single-pass deformation amount of the third pass is 13.78%, and the cumulative deformation amount is 38.77%, the single-pass deformation amount of the fourth pass is 14.79%, and the cumulative deformation amount is 53.57%, the single-pass deformation amount of the fifth pass is 15.97%, and the cumulative deformation amount is 69.54%, and the single-pass deformation amount of the sixth pass is 17.36%, and the cumulative deformation amount is 86.89%.

6. The method for regulating the yield ratio of TB13 titanium alloy wire according to claim 1, characterized in that: In step C, during the roller die drawing process, a water-soluble lubricating liquid is used to lubricate the roller die and the wire.

7. The method for regulating the yield ratio of TB13 titanium alloy wire according to claim 1, characterized in that: At least one of the following is met: In step D, during annealing, the line speed is 2 to 4 m / min; In step D, during annealing, the holding time is 5 to 10 minutes.

8. The method for adjusting the yield ratio of TB13 titanium alloy wire according to any one of claims 1 to 7, characterized in that: In step D, the cooling is performed by air cooling, and the protective gas is a high-purity inert gas.

9. The TB13 titanium alloy wire prepared by the method according to any one of claims 1 to 8.

10. The TB13 titanium alloy wire according to claim 9, characterized in that: Its yield strength is 678-708MPa, tensile strength is 719-812MPa, elongation after fracture is 23-27%, cross-sectional shrinkage is 53-71%, yield strength ratio is 0.867-0.950, α phase content is 0.3%-18.6%, and β phase content is 99.7-81.4%.

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