TB14 titanium alloy wire preparation method based on recrystallization kinetics control

Abstract

The invention discloses a TB14 titanium alloy wire preparation method based on recrystallization kinetics control, and belongs to the technical field of high-quality titanium alloy materials. The method comprises the steps that one-heating-number cast ingot cogging forging and three-heating-number tempering are adopted, and a forging stock is prepared; the forging stock is subjected to two-heating-number deformation rolling, and a hot-rolled coil is obtained; performing recrystallization heat treatment on the hot-rolled coil to obtain a wire blank; and drawing and reducing the diameter of the wire blank to obtain the wire. The transverse microstructure and the longitudinal microstructure of the prepared TB14 wire rod are recrystallized and are uniform, the average grain size of the wire rod is about 30 microns, the grain sizes are 6-7 grades respectively, various indexes of the TB14 wire rod for aviation fasteners are met, and certain surplus is reserved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of high-quality titanium alloy materials, and relates to the manufacturing of TB14 titanium alloy wire, in particular to a TB14 titanium alloy wire preparation method based on recrystallization kinetics control. BACKGROUND

[0002] The TB14 titanium alloy has excellent corrosion resistance, high specific strength, good mechanical properties and processing performance, and is suitable for manufacturing rivets for composite material connection. The TB14 titanium alloy rivet is mainly applied to the high-temperature area of the rear fuselage edge strip and the tail cover. Due to its excellent cold working performance, the rivet can be prepared by high-speed continuous cold upsetting and cold riveting, and can replace the TB2, pure titanium and other rivets which need to be heated and riveted.

[0003] The existing TB14 titanium alloy wire product itself and its preparation technology have the following defects: first, the TB14 titanium alloy disc wire is prepared by the "forging + rolling + drawing" process in the early stage of preparation, and the blank texture causes the hot-rolled coil to be unable to recrystallize, so that the prepared finished wire has uneven organization and too strong texture, which cannot meet the strict requirements of the TB14 titanium alloy disc wire for aviation. Second, most manufacturers use small weight forging blanks in the process of producing TB14 titanium alloy wire, and adopt multi-row type rolling mills, mainly models 430, 350, 280 and 250, etc. There are many uncontrollable factors in the production process, there is a risk of performance difference in the same batch of blanks, and the blanks are limited by tooling, personnel operation and blank temperature drop. The closer to the finished product specification, the smaller the single weight of the blank, and finally leading to the risk of differences in organization and performance between batches. Third, the product is a 10kg level small single weight wire, which is insufficient to meet the needs of aviation and aerospace. SUMMARY

[0004] In view of the defects of the prior art, the purpose of the present application is to provide a TB14 titanium alloy wire preparation method based on recrystallization kinetics control, which solves the technical problems that the preparation process of the TB14 titanium alloy wire in the prior art leads to uneven organization and too strong texture, the small forging blank rolling process is unstable, causing the risk of performance difference between batches, the finished product single weight is only 10kg level, and it cannot meet the needs of aviation and aerospace.

[0005] In order to solve the above technical problems, the technical scheme is adopted as follows: A TB14 titanium alloy wire preparation method based on recrystallization kinetics control, which makes the organization fully recrystallize through recrystallization heat treatment. The method specifically includes the following steps: Step one, a one-time ingot breaking forging and a three-time tempering are adopted to prepare a forging blank.

[0006] Step two, the forging blank prepared in step one is deformed and rolled by two times to prepare a hot-rolled coil.

[0007] Step 3: Perform recrystallization heat treatment on the hot-rolled coil obtained in step 2 to obtain a wire blank: heat the hot-rolled coil at 860°C to 900°C; the heating coefficient is 0.6 to 0.8 min / mm, preferably 0.7 min / mm; the heating time is 0.8 to 1.2 hours, preferably 1 hour; after the heating is completed, the hot-rolled coil is taken out of the furnace and air-cooled to fully recrystallize the structure of the hot-rolled coil, thereby obtaining a wire blank with uniform and consistent structure.

[0008] Step 4: Drawing and reducing the wire blank obtained in step 3 to obtain wire.

[0009] The present invention also has the following technical features: Specifically, the step one includes: heating the TB14 titanium alloy ingot at a heating temperature of 1025°C to 1100°C, preferably 1050°C; a heating coefficient of 0.6 to 0.9 min / mm, preferably 0.75 min / mm; performing upsetting and drawing forging once after being taken out of the furnace; performing intermediate tempering three times, with the tempering heating temperatures being 1025°C to 1100°C, 1000°C to 930°C, 900°C to 800°C, preferably 1050°C, 950°C, and 850°C, respectively; the tempering heating coefficient being 0.2 to 0.5 min / mm, preferably 0.3 min / mm; drawing after being taken out of the furnace; controlling the final forging temperature at above 700°C, air cooling after forging, and obtaining a forging billet with a cross-sectional diameter of 160 mm.

[0010] Specifically, in step 1, the upsetting deformation is controlled at 30-40%, preferably 35%.

[0011] Specifically, in step 1, the elongation deformation after tempering is controlled at 30-40%, preferably 35%.

[0012] Specifically, the step 2 includes: Step 2.1, first heat deformation rolling: heating the forged bar obtained in step 1 to 860° C. with a heating coefficient of 0.6 to 0.9 min / mm, preferably 0.7 min / mm; after being taken out of the furnace, performing multiple rolling passes to roll the bar into a bar with a cross-sectional diameter of 100 mm; Specifically, in step 2.1, the number of rolling passes is nine; the rolling deformation is controlled at 50% to 70%, preferably 60%; and the rolling speed is controlled at 1 to 3 mm / s, preferably 2 mm / s.

[0013] Step 2.2, second deformation rolling: the rod blank prepared in step 2.1 is heated to 850℃, the heating coefficient is 0.6-0.9 min / mm, preferably 0.7 min / mm; after discharging, multi-pass rolling is first carried out, then intermediate rolling and longitudinal type finishing rolling are carried out until the hot-rolled coil with a specification of 8.0 mm in diameter is obtained, and the single weight of the hot-rolled coil is 200 kg.

[0014] Specifically, in step 2.2, the rolling passes are 11 times; the rolling deformation is controlled at 95%-100%, preferably 99%; and the rolling speed is controlled at 2-5 mm / s.

[0015] Specifically and optionally, the step four comprises: Step 4.1, peeling treatment: the hot-rolled coil after the recrystallization heat treatment in step three is peeled by 0.5 mm, and peeled to the surface without black skin, cracks and other defects.

[0016] Step 4.2, diameter reduction by drawing: the hot-rolled coil after peeling is drawn by roll die drawing, the drawing speed is 0.8 m / min-1.2 m / min, preferably 1 m / min; the single pass diameter reduction amount is 0.4 mm-0.6 mm, preferably 0.5 mm, and finally drawn to a diameter of 4.3 mm wire.

[0017] Step 4.3, finishing: removing a small amount of scratches, drawing traces and other defects on the surface of the wire, and ensuring that the size of the wire is within the tolerance range, finally obtaining a finished TB14 titanium alloy coil wire with a diameter of 4.0 mm and a weight of more than 100 kg.

[0018] Specifically and optionally, the step four comprises: Step 4.1, first diameter reduction by drawing: the hot-rolled coil obtained after the recrystallization heat treatment in step three is drawn, the drawing speed is 8 m / s-12 m / s, preferably 10 m / s; the single pass diameter reduction amount is 0.2 mm-0.5 mm, preferably 0.3 mm; the drawing temperature is 720℃; and a coil with a diameter of 8.0 mm is obtained.

[0019] Step 4.2, annealing treatment: heating at 750℃-850℃, preferably 800℃; the heating coefficient is 0.6-0.9 min / mm, preferably 0.7 min / mm; the heating time is 0.8-1.2 h, preferably 1 h; after heating, the hot-rolled coil is discharged and air-cooled to make the structure of the hot-rolled coil fully recrystallize, and a coil with uniform structure is obtained; Step 4.3, peeling treatment: peeling by 0.5 mm, and peeled to the surface without black skin, cracks and other defects; Step 4.4, second drawing reduction: the hot-rolled coil after peeling is subjected to roll die drawing, the drawing speed is 8 m / s-12 m / s, preferably 10 m / s; the single pass reduction is 0.2 mm-0.5 mm, preferably 0.3 mm; the diameter of the drawn wire is 4.3 mm; Step 4.5, finishing: removing a small amount of scratches, drawing traces and other defects on the surface of the wire, and ensuring that the size of the wire is within the tolerance range, finally obtaining 100 kg or more of finished TB14 titanium alloy diameter 4.0 mm round wire.

[0020] Compared with the prior art, the present application has the beneficial technical effects of: (I) The present application recrystallizes the TB14 titanium alloy by means of recrystallization heat treatment, and the final TB14 round wire has recrystallized microstructure in both horizontal and vertical directions, uniform structure, and an average grain size of about 30 μm, with a grain size of 6-7 levels, meeting the various indexes of TB14 round wire for aerospace fasteners, and leaving a certain amount of excess.

[0021] (II) The present application adopts longitudinal finishing during deformation rolling, making the rolling process more stable and controllable, and ensuring the uniformity of the performance of different batches of products.

[0022] (III) The present application can produce 100 kg or more of large single weight TB14 round wire, realizing the batch industrial production of high-quality TB14 titanium alloy wire. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 Low-magnification microstructure image of TB14 titanium alloy diameter 4.0 mm wire prepared in Example 1. Figure 1 (a) is a low-magnification microstructure image of the cross section of the wire.

[0024] Figure 2 High-magnification microstructure image of TB14 titanium alloy diameter 4.0 mm wire prepared in Example 1. Figure 2 (a) is a high-magnification microstructure image of the cross section of the wire.

[0025] Figure 3 Low-magnification microstructure image of TB14 titanium alloy diameter 4.0 mm wire prepared in Example 2. Figure 3 (a) is a low-magnification microstructure image of the cross section of the wire.

[0026] Figure 4 High-magnification microstructure image of TB14 titanium alloy diameter 4.0 mm wire prepared in Example 2. Figure 4Fig. 2 shows the low magnification microstructure images of the 4.0 mm diameter TB14 titanium alloy wire prepared in Example 1.

[0027] Figure 5 Fig. 3 shows the high magnification microstructure images of the 4.0 mm diameter TB14 titanium alloy wire prepared in Example 1. Figure 5 Fig. 4 shows the low magnification microstructure images of the 4.0 mm diameter TB14 titanium alloy wire prepared in Example 1.

[0028] Figure 6 Fig. 5 shows the high magnification microstructure images of the 4.0 mm diameter TB14 titanium alloy wire prepared in Example 1. Figure 6 Fig. 6 shows the low magnification microstructure images of the 4.0 mm diameter TB14 titanium alloy wire prepared in Example 1.

[0029] The technical solutions of the present application are further described below in conjunction with examples. DETAILED DESCRIPTION

[0030] It should be noted that all the raw materials used in the present application are known in the art, and no special explanation is given. For example, the specific components of the TB14 titanium alloy are as follows: niobium is 45 wt%, oxygen is 0.08 wt%, and the balance is titanium.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for describing particular embodiments only and is not intended to be limiting of the application.

[0032] In the present application, when a numerical interval (i.e. a numerical range) is involved, the numerical values within the numerical interval are considered to be continuous and include both numerical endpoints (i.e. the minimum and maximum values) of the numerical range and every numerical value between the two numerical endpoints, unless otherwise specified. When a numerical interval refers only to integers within the numerical interval, including both numerical endpoint integers and every integer between the two numerical endpoint integers, in this document, it is equivalent to directly listing each integer, such as t is an integer selected from 1-10, which means t is any one integer selected from the group consisting of 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10. In addition, when multiple ranges are provided to describe a feature or characteristic, these ranges can be combined. In other words, unless otherwise specified, the ranges disclosed herein should be understood to include any and all sub-ranges encompassed therein.

[0033] The temperature parameter in the present application, if not particularly limited, allows both constant temperature treatment and variation within a certain temperature range. It should be understood that the constant temperature treatment allows the temperature to fluctuate within the accuracy range controlled by the instrument. Fluctuation within a range such as ±5℃, ±4℃, ±3℃, ±2℃, ±1℃ is allowed.

[0034] In the present application, the heating time is calculated according to the diameter or thickness of the material using the following formula: 0.7D≤τ≤0.8D, wherein D is the diameter / thickness (mm) and τ is the time (min).

[0035] The existing process scheme for preparing TB14 titanium alloy disc round wire is "forging + rolling + drawing", and the process scheme of "1 fire 3 tempering + 2 fire times rolling + heat treatment + drawing reduction" is used to replace the above scheme. According to the above technical scheme, the specific embodiments of the present application are given below. It should be noted that the present application is not limited to the following specific embodiments, and any equivalent transformation based on the technical scheme of the present application falls within the protection scope of the present application.

[0036] Example 1: The present embodiment gives a TB14 titanium alloy wire preparation method based on recrystallization kinetics control, which is used for preparing TB14 titanium alloy wire with a diameter of 4.0 mm, and the method comprises the following steps: Step one, using one fire ingot breakdown forging and three fire tempering to prepare a forged blank: The TB14 titanium alloy ingot is heated, the heating temperature is 1050℃, the heating coefficient is 0.75 min / mm, after discharging, 1 upsetting and elongation forging is carried out by using 25MN fast forging machine, the upsetting and elongation deformation amount is controlled at 35%; intermediate tempering 3 times, the heating temperature of tempering is 1050℃, 950℃ and 850℃ respectively, the heating coefficient is 0.3 min / mm, after discharging, elongation is carried out, the deformation amount is controlled at 30-40%, the final forging temperature is controlled at more than 700℃, the forged blank with a cross-sectional diameter of 160mm and a length of L mm is obtained after air cooling.

[0037] Step two, two fire times deformation rolling of the forged blank prepared in step one to prepare a hot rolling coil: Step 2.1, first fire time deformation rolling: the forged rod obtained in step one is heated to 860℃, the heating coefficient is 0.7 min / mm, after discharging, 9 pass rolling is carried out by using a reciprocating rolling mill with a rolling mill diameter of 650mm, the rod blank with a cross-sectional diameter of 100mm and a length of L mm is obtained, the rolling deformation amount is controlled at 60%, and the rolling speed is controlled at 2mm / s.

[0038] Step 2.2, second fire deformation rolling: the bar blank obtained in the first fire is heated to 850℃, the heating coefficient is 0.7 min / mm, after discharging, the hot-rolled coil with a diameter of 8.0 mm is obtained by using a full-flow temperature control and rolling production line and a reciprocating rolling mill with a rolling diameter of 650 mm to carry out 11 passes of rolling, and then passing through a medium rolling mill group and a finishing rolling / Kocks longitudinal rolling mill to a specification of a diameter of 8.0 mm, a single weight of 200 kg, and a total deformation amount of rolling controlled at 99%, and a rolling speed controlled at 2-5 mm / s.

[0039] Step three, recrystallization heat treatment is carried out on the hot-rolled coil obtained in step two to obtain a wire blank: The hot-rolled coil with a diameter of 8.0 mm obtained in step 2.2 after the second fire deformation rolling is heated to 900℃ by using a box-type annealing furnace, the heating coefficient is 0.7 min / mm, after 1h of heat preservation, the hot-rolled coil is discharged and air-cooled to make the hot-rolled coil organization fully recrystallize, and the wire blank with uniform and consistent organization is obtained.

[0040] Step four, the wire blank obtained in step three is subjected to drawing and reducing in diameter to obtain a wire: Step 4.1, skinning treatment: The hot-rolled coil with a diameter of 8.0 mm obtained after the recrystallization heat treatment in step three is skinned by 0.5 mm by using a centerless lathe skinner, and the surface is free of defects such as black skin and cracks; Step 4.2, drawing and reducing in diameter: Then, the hot-rolled coil after skinning is subjected to roll die drawing by using a roll die drawing machine, the speed is 10 m / s, and the wire is drawn to a diameter of 4.3 mm by single pass 0.3 mm reducing in diameter, and the wire blank is drawn to a diameter of 4.3 mm by roll die drawing; Step 4.3, finishing: After the skinner and the polisher, a small amount of scratches and drawing traces on the surface of the wire are removed, and the size of the wire is ensured to be within the tolerance range, and finally, the finished TB14 titanium alloy wire blank with a diameter of 4.0 mm and a single weight of more than 100 kg is obtained.

[0041] Effect verification of example 1: Figure 1 The macrostructure diagrams of the TB14 titanium alloy wire blank with a diameter of 4.0 mm prepared in example 1 of the present application after heat treatment are shown in FIG. 1. Figure 1 It can be seen that there are no cracks, folds, pores, metal or non-metal inclusions, segregation, shrinkage tail and other visible metallurgical defects in the macrostructure, and there are no obvious coarse grains.

[0042] Figure 2 The microstructure diagrams of the core of the TB14 titanium alloy wire blank with a diameter of 4.0 mm prepared in example 1 of the present application after heat treatment are shown in FIG. 2. Figure 2It can be seen that the high magnification structure uniformity of the wire core is obviously improved compared with Example 1, the microstructure is recrystallized, but there are still some larger grains, the average grain size is 50-60 μm, the grain size grade is lower, and it meets the lower limit of the delivery requirement of TB14 titanium alloy finished wire for aerospace.

[0043] Example 2: The present embodiment gives a TB14 titanium alloy wire preparation method based on recrystallization kinetics control, which is used for preparing TB14 titanium alloy wire with a diameter of 4.0 mm, and the method comprises the following steps: Step one, using one-time ingot casting, open die forging and three-time tempering, a forged blank is prepared: The TB14 titanium alloy ingot is heated, the heating temperature is 1050℃, the heating coefficient is 0.75 min / mm, after discharging, 1-time upsetting and elongation forging is carried out by using a 25MN fast forging machine, the upsetting and elongation deformation is controlled at 35%. Intermediate tempering is carried out for 3 times, the heating temperature of tempering is 1050℃, 950℃ and 850℃ respectively, the heating coefficient is 0.3 min / mm, after discharging, elongation is carried out, the deformation is controlled at 30-40%, the final forging temperature is controlled at more than 700℃, after forging, air cooling is carried out, a forged blank with a cross-sectional diameter of 160 mm and a length of L mm is obtained.

[0044] Step two, two-time deformation rolling of the forged blank prepared in step one is carried out to prepare a hot-rolled coil: Step 2.1, first-time deformation rolling: the forged rod obtained in step one is heated to 860℃, the heating coefficient is 0.7 min / mm, after discharging, 9-pass rolling is carried out by using a reciprocating rolling mill with a roller diameter of 650 mm, the rod blank with a cross-sectional diameter of 100 mm and a length of L mm is obtained, the rolling deformation is controlled at 60%, and the rolling speed is controlled at 2 mm / s.

[0045] Step 2.2, second-time deformation rolling: the rod blank obtained in the first time is heated to 850℃, the heating coefficient is 0.7 min / mm, after discharging, 11-pass rolling is carried out by using a reciprocating rolling mill with a roller diameter of 650 mm on a full-flow temperature and rolling control production line, and then the specification is rolled to a hot-rolled coil with a diameter of 15.0 mm by using a medium rolling mill, the single weight is 200 kg, the total rolling deformation is controlled at 97%, and the rolling speed is controlled at 2-5 mm / s.

[0046] Step three, recrystallization heat treatment is carried out on the hot-rolled coil prepared in step two to prepare a wire blank: The hot-rolled coil with a diameter of 8.0 mm prepared after the second-time deformation rolling in step 2.2 is heated to 860℃ by using a box-type annealing furnace, the heating coefficient is 0.7 min / mm, after 1h of heat preservation, the hot-rolled coil is discharged and air cooled to make the hot-rolled coil structure fully recrystallized, and a uniform and consistent wire blank is obtained.

[0047] Step four, the wire blank prepared in step three is drawn to reduce the diameter to prepare a wire: Step 4.1, first drawing to reduce the diameter: The hot-rolled coil with a diameter of 15.0 mm obtained after the recrystallization heat treatment in step three is drawn to reduce the diameter by 0.5 mm per pass using a hot drawing machine, the drawing temperature is 720℃, the speed is 1 m / min, and the coil with a diameter of 8.0 mm is obtained by heating in a through type heating furnace. Step 4.2, annealing treatment: The coil with a diameter of 8.0 mm is heated to 800℃ in a box type annealing furnace, the heating coefficient is 0.7 min / mm, and the hot-rolled coil is taken out after 1h of heat preservation and air cooling to make the structure of the hot-rolled coil fully recrystallize, so that the coil with uniform and consistent structure is obtained. Step 4.3, skinning treatment: The skinning machine is used to skin 0.5 mm, and the surface is free of black skin, cracks and other defects. Step 4.4, second drawing to reduce the diameter: The hot-rolled coil after skinning is drawn by a roll die drawing machine, the speed is 10 m / s, and the coil is drawn to a diameter of 4.3 mm by single pass of 0.3 mm. Step 4.5, finishing: The defects such as scratches and drawing marks on the surface of the wire are removed by the skinning machine and the polishing machine, and the size of the wire is ensured to be within the tolerance range, so that the finished TB14 titanium alloy coil wire with a diameter of 4.0 mm and a weight of more than 100 kg is obtained.

[0048] Effect verification of example 2: Figure 3 The macrostructure of the TB14 titanium alloy coil wire with a diameter of 4.0 mm prepared in example 2 before and after heat treatment is shown in FIG. 2. It can be seen from FIG. 2 that the macrostructure of the wire is uniform, and the wire is free of cracks, folds, pores, metal or non-metallic inclusions, segregation, shrinkage tail and other visible metallurgical defects. Figure 3 It can be seen that the macrostructure is free of cracks, folds, pores, metal or non-metallic inclusions, segregation, shrinkage tail and other visible metallurgical defects, and no obvious coarse grains are observed.

[0049] Figure 4 The microstructure of the core of the TB14 titanium alloy coil wire with a diameter of 4.0 mm prepared in example 2 after heat treatment is shown in FIG. 3. It can be seen from FIG. 3 that the microstructure of the core of the wire is uniform, and the wire is free of cracks, folds, pores, metal or non-metallic inclusions, segregation, shrinkage tail and other visible metallurgical defects. Figure 4 It can be seen that the microstructure of the core of the wire is uniform, and the wire is free of cracks, folds, pores, metal or non-metallic inclusions, segregation, shrinkage tail and other visible metallurgical defects.

[0050] Comparative example 1: The present comparative example gives a preparation method of TB14 titanium alloy wire, which is used for preparing TB14 titanium alloy wire with a diameter of 4.0 mm, and the method comprises the following steps: Step one, using one heat of ingot breaking down and three times of tempering, a forged blank is prepared: The TB14 titanium alloy ingot is heated, the heating temperature is 1050℃, the heating coefficient is 0.75 min / mm, after discharging, 1 time of upsetting and elongation forging is carried out by using a 25MN quick forging machine, the upsetting and elongation deformation is controlled to be 35%; intermediate tempering is carried out for 3 times, the heating temperature of tempering is 1050℃, 950℃ and 850℃ respectively, the heating coefficient is 0.3 min / mm, after discharging, elongation is carried out, the deformation is controlled to be 30-40%, the final forging temperature is controlled to be above 700℃, after forging, air cooling is carried out, a forged blank with a cross-sectional diameter of 160mm and a length of L mm is obtained.

[0051] Step two, the forged blank prepared in step one is deformed by rolling for two times, and a hot-rolled coil is prepared: Step 2.1, first time deformation rolling: the forged blank obtained in step one is heated to 860℃, the heating coefficient is 0.7 min / mm, after discharging, 9 passes of rolling are carried out by using a reciprocating rolling mill with a roller diameter of 650 mm, the rod blank with a specification of a cross-sectional diameter of 100mm and a length of L mm is rolled, the rolling deformation is controlled to be 60%, and the rolling speed is controlled to be 2 mm / s.

[0052] Step 2.2, second time deformation rolling: the rod blank obtained by the first time deformation rolling is heated to 850℃, the heating coefficient is 0.7 min / mm, after discharging, 11 passes of rolling are carried out by using a reciprocating rolling mill with a roller diameter of 650 mm on a full-flow temperature and rolling control production line, and then the hot-rolled coil with a diameter of 8.0 mm is rolled through the intermediate rolling unit and the finishing rolling / Kocks longitudinal rolling mill, the single weight is 200 kg, the total rolling deformation is controlled to be 99%, and the rolling speed is controlled to be 2-5 mm / s.

[0053] Step three, the hot-rolled coil prepared in step two is drawn and reduced in diameter to prepare a wire: The hot-rolled coil with a diameter of 8.0 mm prepared in step 2.2 is peeled 0.5 mm by using a centerless lathe peeler, and the surface is free of black skin, cracks and other defects; then the hot-rolled coil after peeling is drawn by using a roll die drawing machine, the speed is 10 m / s, the single pass reduction amount is 0.3 mm, the disc round wire is drawn to a diameter of 4.3 mm; the small scratches, drawing marks and other defects on the surface of the wire are removed by using a peeler and a polisher, and the size of the wire is ensured to be within the tolerance range, and finally more than 100 kg of TB14 titanium alloy disc round wire with a diameter of 4.0 mm is obtained.

[0054] Effect verification of Comparative Example 1: Figure 5 The low-magnification microstructure of the transverse and longitudinal sections of the 4.0 mm diameter round wire of the TB14 titanium alloy prepared in Comparative Example 1 after heat treatment is shown in Table 1. It can be seen from Table 1 that no cracks, folds, pores, metallic or non-metallic inclusions, segregation, shrinkage tails and other visible metallurgical defects are observed in the low-magnification microstructure, but there are some clear grains after large deformation rolling and drawing, and the microstructure is not uniform. Figure 5

[0055] Figure 6 The high-magnification microstructure of the transverse and longitudinal sections of the core of the 4.0 mm diameter round wire of the TB14 titanium alloy prepared in Comparative Example 1 after heat treatment is shown in Table 2. It can be seen from Table 2 that the high-magnification microstructure of the core of the wire is not uniform, and there is a recrystallized region, which cannot meet the delivery requirements of the finished wire of the TB14 titanium alloy for aerospace. Figure 6

[0056] The above examples are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application.​​

Claims

1. A method for preparing TB14 titanium alloy wire based on recrystallization kinetics control, characterized in that: The method uses recrystallization heat treatment to fully recrystallize the structure; specific process parameters include: heating at 860°C to 900°C; and a heating coefficient of 0.6 to 0.8 min / mm.

2. The method for preparing TB14 titanium alloy wire based on recrystallization kinetics control according to claim 1, characterized in that: The method specifically comprises the following steps: Step 1: Forging the ingot by one heat and tempering it by three heats to obtain a forging blank; Step 2: performing two-stage deformation rolling on the forging blank obtained in step 1 to obtain a hot-rolled coil; Step 3, performing recrystallization heat treatment on the hot rolled coil obtained in step 2 to obtain a wire blank; Step 4: Drawing and reducing the wire blank obtained in step 3 to obtain wire.

3. The method for preparing TB14 titanium alloy wire based on recrystallization kinetics control according to claim 2, characterized in that: The step 1 includes: heating the TB14 titanium alloy ingot at a heating temperature of 1025°C to 1100°C; a heating coefficient of 0.6 to 0.9 min / mm; performing upsetting and drawing forging after taking it out of the furnace; tempering three times in the middle, with the tempering heating temperatures of 1025°C to 1100°C, 1000°C to 930°C, and 900°C to 800°C respectively; the tempering heating coefficient of 0.2 to 0.5 min / mm; drawing after taking it out of the furnace; controlling the final forging temperature at above 700°C, and air cooling after forging.

4. The method for preparing TB14 titanium alloy wire based on recrystallization kinetics control according to claim 3, characterized in that: In step 1, the upsetting deformation is controlled at 30% to 40%.

5. The method for preparing TB14 titanium alloy wire based on recrystallization kinetics control according to claim 3, characterized in that: In step 1, the amount of elongation deformation after tempering is controlled at 30% to 40%.

6. The method for preparing TB14 titanium alloy wire based on recrystallization kinetics control according to claim 2, characterized in that: The second step includes: Step 2.1, first heat deformation rolling: heating the forged bar obtained in step 1 to 860°C with a heating coefficient of 0.6-0.9 min / mm; after being taken out of the furnace, performing multiple rolling to obtain a bar blank; Step 2.2, second heat deformation rolling: heat the bar blank obtained in step 2.1 to 850°C with a heating coefficient of 0.6-0.9 min / mm; after being taken out of the furnace, it is first subjected to multi-pass rolling, and then to intermediate rolling and longitudinal finishing rolling to obtain a hot-rolled coil.

7. The method for preparing TB14 titanium alloy wire based on recrystallization kinetics control according to claim 6, characterized in that: In step 2.1, the rolling passes are nine times; the rolling deformation is controlled at 50% to 70%; and the rolling speed is controlled at 1 to 3 mm / s.

8. The method for preparing TB14 titanium alloy wire based on recrystallization kinetics control according to claim 6, characterized in that: In step 2.2, the number of rolling passes is 11; the rolling deformation is controlled at 95% to 100%; and the rolling speed is controlled at 2 to 5 mm / s.

9. The method for preparing TB14 titanium alloy wire based on recrystallization kinetics control according to claim 2, characterized in that: The fourth step comprises: performing two drawing and reducing operations, and performing an annealing treatment between the two drawing and reducing operations; The first drawing reduction includes: a drawing speed of 0.8 m / min to 1.2 m / min; a single-pass diameter reduction of 0.4 mm to 0.6 mm; Annealing treatment includes: heating at 750℃~850℃, with a heating coefficient of 0.6~0.9 min / mm; after heating, taking out of the furnace and air cooling to fully recrystallize the material structure; The second drawing reduction includes: a drawing speed of 8 m / s to 12 m / s, and a single-pass diameter reduction of 0.2 mm to 0.5 mm.

10. The method for preparing TB14 titanium alloy wire based on recrystallization kinetics control according to claim 2, characterized in that: The step 4 includes: performing a drawing and reducing process; The one-pass drawing reduction includes: a drawing speed of 8 m / s to 12 m / s, and a single-pass diameter reduction of 0.2 mm to 0.5 mm.

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