CN110773686A

CN110773686A - Preparation method of TB3 titanium alloy wire for fastener

Info

Publication number: CN110773686A
Application number: CN201911073036.1A
Authority: CN
Inventors: 刘娣; 周中波; 张利军; 薛祥义; 张晨辉; 邵博; 刘小花
Original assignee: Xi'an Super Crystal Science & Technology Development Co Ltd
Current assignee: Xi'an Supercrystalline Technology Co ltd
Priority date: 2019-11-05
Filing date: 2019-11-05
Publication date: 2020-02-11
Anticipated expiration: 2039-11-05
Also published as: CN110773686B

Abstract

A preparation method of a TB3 titanium alloy wire for a fastener comprises the steps of carrying out homogenization annealing treatment on a TB3 titanium alloy ingot; cooling the furnace to a temperature above the phase change point after annealing treatment, heating, and then cogging and forging to form a square billet; heating the cogging forged square billet at a temperature above the alloy phase transition point, forging, and heating and forging for multiple times to obtain a bar with the diameter of between 120 and 140 mm; precisely forging the bar into a bar with the diameter of 85-90 mm; heating the bar material and rolling the bar material into a bar material with phi 9.0 mm-phi 9.5 mm; then heating and drawing into a wire with the phi of 3.5mm to phi of 5.5 mm; and straightening the wire after solution treatment to obtain the TB3 titanium alloy wire for the fastener of phi 3.0-phi 5.0 mm.

Description

Preparation method of TB3 titanium alloy wire for fastener

Technical Field

The invention belongs to the technical field of titanium alloy material processing, and particularly relates to a preparation method of a TB3 titanium alloy wire for a fastener.

Background

The TB3 titanium alloy is a metastable β titanium alloy which is researched and developed by the northwest nonferrous metals institute in the last 60 th century in 20 th century, has good cold and hot processing performances, is easy to forge, can be rolled and welded, can obtain high mechanical property and good matching of strength and fracture toughness through heat treatment, and particularly can be cold-formed, so that the TB3 becomes the titanium alloy mainly used for fasteners.

The semi-finished product for manufacturing the fastener for spaceflight is generally a small-size wire with the diameter of 4-10 mm. The wire is generally prepared by adopting a process method of free forging, hot rolling and rotary forging. Because the rotary swaging is mainly operated manually, the human factors are more, and simultaneously, the blank is limited by the shape of the hammer die, so that the uneven deformation is more obvious in the rotary swaging processing due to the bending deformation and the widening deformation, the hidden troubles of material cracking, brittleness and breakage are caused, and the performance of the wire material is unstable.

Disclosure of Invention

In order to solve the problems of forming and unstable performance of small-size wires, the invention aims to provide a preparation method of a TB3 titanium alloy wire for fasteners.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows:

a method for preparing TB3 titanium alloy wire for fasteners comprises the following steps:

1) homogenizing annealing

Carrying out homogenization annealing treatment on the TB3 titanium alloy ingot;

2) cogging forging

Cooling the furnace after the annealing treatment in the step 1) to a temperature above a phase change point, heating, and then cogging and forging into a square billet;

3) forging of intermediate blank

Heating the square billet subjected to cogging and forging in the step 2) at a temperature above the alloy phase transition point, forging, and performing heating and forging for multiple times to obtain a bar with the diameter of 120-140 mm;

4) finish forging

Precisely forging the bar material prepared in the step 3) into a bar material with the diameter of between 85 and 90 mm;

5) rolling of

Heating the bar prepared in the step 4), and rolling the bar into a bar with the phi of 9.0-9.5 mm;

6) drawing

Heating the bar material prepared in the step 5), and drawing the bar material into a wire material with the phi of 3.5mm to phi of 5.5 mm;

7) on-line solid solution and straightening

And (3) carrying out solution treatment on the wire prepared in the step 6) above a phase transition point and then straightening to obtain a TB3 titanium alloy wire for fasteners with the diameter of phi 3.0-phi 5.0 mm.

The further improvement of the invention is that in the step 1), the specific conditions of the homogenizing annealing treatment are as follows: heating to 1150-1170 ℃, and preserving the heat for 120-150 min.

The further improvement of the invention is that in the step 2), the heating temperature is 1000-1050 ℃, the heat preservation time is 30-60 min, the final forging temperature of forging is more than or equal to 800 ℃, and water cooling is carried out after forging.

The further improvement of the invention is that in the step 3), the heating temperature is 800-950 ℃, the heat preservation time is 120-150 min, the final forging temperature of forging is more than or equal to 650 ℃, and water cooling is carried out after forging.

The further improvement of the invention is that in the step 3), forging is carried out by two upsetting and two drawing processes at each fire, the upsetting ratio is 1.6-2.0, and the bars are formed by drawing, rounding and rolling at the last fire.

The further improvement of the invention is that the forging is carried out by heating for 3-4 times in the step 3).

The further improvement of the invention is that in the step 4), the heating temperature is 770-790 ℃, the heat preservation time is 80-100 min, the finish forging temperature of the finish forging is more than or equal to 650 ℃, and the air cooling is carried out after the forging.

The further improvement of the invention is that in the step 5), the heating temperature is 740-760 ℃, and the heat preservation time is 50-60 min.

The further improvement of the invention is that in the step 6), the heating temperature is 720-740 ℃, and the heat preservation time is 30 min.

The further improvement of the invention is that in the step 7), the solid solution temperature is 800-815 ℃, and the heat preservation time is 15-30 min.

Compared with the prior art, the invention has the following beneficial effects:

according to the invention, the original process methods of free forging, hot rolling and rotary forging are replaced by the processing technologies of free forging, finish forging, rolling and drawing, the finish forging is followed by rolling with large deformation, the rolling deformation is more than 80%, and the crystal grains can be effectively refined to obtain fine equiaxial structures, so that the mechanical property of the material is improved. The tensile strength of the TB3 titanium alloy wire prepared by the method can reach more than 1100MPa, the elongation of more than 6 percent, the shear strength of more than 700MPa and the grain size of more than 7 grades. And drawing is subsequently adopted to further control the surface quality and the dimensional accuracy of the wire material, so as to obtain the TB3 titanium alloy wire material with excellent tissue performance. The surface roughness of the wire prepared by the method is less than or equal to 1.2 mu m, the straightness is less than or equal to 1.0mm/m, and the size deviation is

Detailed Description

The present invention is described in further detail below with reference to examples:

a preparation method of a TB3 titanium alloy small-size wire for a fastener specifically comprises the following steps:

1) homogenizing annealing

Heating the TB3 titanium alloy ingot to 1150-1170 ℃, preserving the heat for 120-150 min, and carrying out homogenization annealing treatment.

2) Cogging forging

And (3) cooling the furnace to a temperature above the phase change point after annealing treatment in the step (1) for heating, then cogging and forging to form a square billet, and removing cracks on the surface of the forging by adopting a polishing mode.

3) Forging of intermediate blank

And (3) heating the square billet subjected to cogging and forging in the step (2) at a temperature above the alloy phase transition point, forging, heating and forging by 2-4 fire to obtain a bar with the diameter of 120-140 mm, and removing cracks on the surface of the forging by adopting a polishing mode after forging each time.

4) Finish forging

And (4) precisely forging the bar prepared in the step (3) into a bar with the diameter of 85-90 mm, and removing cracks on the surface of the forging by adopting a polishing mode.

5) Rolling of

And (4) heating the bar prepared in the step (4), rolling the bar into a bar with the diameter of 9.0-9.5 mm, removing oxide skin on the surface by using a centerless lathe, and grinding surface cracks by using an abrasive machine.

6) Drawing

And (4) heating the bar material prepared in the step (5), drawing the bar material into a wire material with the diameter of 3.5 mm-5.5 mm, and blanking according to the fixed length.

7) On-line solid solution and straightening

And (4) straightening the wire prepared in the step (6) after solution treatment above the phase transformation point.

8) Polishing of

And (4) performing surface polishing on the wire straightened in the step (7) to obtain a finished wire with the diameter of 3.0-5.0 mm.

Further, in the step 2), the heating temperature is 1000-1050 ℃, the heat preservation time is 30-60 min, the finish forging temperature is more than or equal to 800 ℃, and water cooling is carried out after forging.

Further, in the step 3), the heating temperature is 800-950 ℃, the heat preservation time is 120-150 min, the finish forging temperature is more than or equal to 650 ℃, and water cooling is carried out after forging. Wherein, forging by two upsetting and two drawing are adopted in each fire forging, the upsetting ratio is 1.6-2.0, and finally drawing by one fire to obtain the round bar.

Further, in the step 4), the heating temperature is 770-790 ℃, the heat preservation time is 80-100 min, the finish forging temperature is more than or equal to 650 ℃, and air cooling is carried out after forging.

Further, in the step 5), the heating temperature is 740 to 760 ℃, and the heat preservation time is 50 to 60 min.

Further, in the step 6), the heating temperature is 720 ℃ to 740 ℃, and the heat preservation time is 30 min.

Further, in the step 7), the solid solution temperature is 800-815 ℃, and the heat preservation time is 15-30 min.

Example 1

Preparing a phi 3.0mmTB3 titanium alloy wire:

1) homogenizing annealing

Heating the TB3 titanium alloy ingot to 1150-1170 ℃, and preserving heat for 120-150 min for carrying out homogenization annealing treatment.

2) Cogging forging

And (3) cooling the furnace to 1000-1050 ℃ after annealing treatment in the step (1), preserving heat for 30-60 min, then cogging and forging to form a square billet, wherein the finish forging temperature is more than or equal to 800 ℃, and cooling by water after forging. And removing cracks on the surface of the forging by adopting a polishing mode after the forging is finished.

3) Forging of intermediate blank

And (3) heating the square billet subjected to cogging forging in the step (2) to 800-950 ℃, preserving heat for 120-150 min, performing upsetting-drawing forging for 2-3 times, performing double upsetting-drawing during forging, wherein the upsetting ratio is 1.6-2.0, the final forging temperature is more than or equal to 650 ℃, and cooling with water after forging. And then heating to 800-820 ℃ for drawing and forging, wherein the finish forging temperature is more than or equal to 650 ℃, and water cooling is carried out after forging to obtain the bar with the phi of 120-phi 140 mm. Meanwhile, after each fire forging, the grinding mode is adopted to remove cracks on the surface of the forging.

4) Finish forging

And (3) heating the bar material prepared in the step (3) to 770-790 ℃, preserving the heat for 80-100 min, performing precision forging to obtain a bar material with phi 85-phi 90mm, performing finish forging at the temperature of more than or equal to 650 ℃, and performing air cooling after forging. And removing cracks on the surface of the forging by adopting a polishing mode.

5) Rolling of

And (4) heating the bar prepared in the step (4) to 760 ℃, keeping the temperature for 50min, rolling the bar into a bar with the phi of 9.0mm, removing oxide skin on the surface by using a centerless lathe, and grinding surface cracks by using an abrasive machine.

6) Drawing

And (4) heating the bar material prepared in the step (5) to 740 ℃, keeping the temperature for 30min, drawing the bar material into a wire material with the diameter of 3.5mm, and blanking according to a fixed length.

7) On-line solid solution and straightening

And (4) straightening the wire prepared in the step (6) after solution treatment, wherein the solution temperature is 800 ℃, and the heat preservation time is 15-30 min.

8) Polishing of

Polishing the surface of the straightened wire material obtained in the step 7

The finished wire has surface roughness less than or equal to 1.2 microns and straightness less than or equal to 1.0 mm/m.

9) Heat treatment and Performance testing

Randomly taking two wires to grade the grain size, wherein the grade result is 8.0; the wire was subjected to aging treatment at 535 ℃ for 16 hours and then to mechanical property tests, as shown in Table 1.

TABLE 1 Ph 3.0mm TB3 titanium alloy wire material room temperature mechanical property

Example 2

Preparing a phi 3.5mmTB3 titanium alloy wire:

1) homogenizing annealing

2) Cogging forging

3) Forging of intermediate blank

4) Finish forging

5) Rolling of

And (4) heating the bar prepared in the step (4) to 750 ℃, keeping the temperature for 50min, rolling the bar into a bar with the phi of 9.0mm, removing oxide skin on the surface by using a centerless lathe, and grinding surface cracks by using an abrasive machine.

6) Drawing

And (4) heating the bar material prepared in the step (5) to 735 ℃, keeping the temperature for 30min, drawing the bar material into a wire material with phi 4.0mm, and blanking according to a fixed length.

7) On-line solid solution and straightening

8) Polishing of

Polishing the surface of the straightened wire material obtained in the step 7

9) Heat treatment and Performance testing

Randomly taking two wires to grade the grain size, wherein the grade result is 7.5-8.0; the wires were subjected to aging treatment at 535 ℃ for 16h and then to mechanical property testing, see Table 2.

TABLE 2 Phi 3.5mmTB3 titanium alloy wire material room temperature mechanical property

Example 3

Preparing a phi 4.0mmTB3 titanium alloy wire:

1) homogenizing annealing

2) Cogging forging

3) Forging of intermediate blank

4) Finish forging

5) Rolling of

And (4) heating the bar prepared in the step (4) to 750 ℃, keeping the temperature for 60min, rolling the bar into a bar with the phi of 9.5mm, removing oxide skin on the surface by using a centerless lathe, and grinding surface cracks by using an abrasive machine.

6) Drawing

And (4) heating the bar material prepared in the step (5) to 730 ℃, keeping the temperature for 30min, drawing the bar material into a wire material with phi 4.5mm, and blanking according to a fixed length.

7) On-line solid solution and straightening

And (4) straightening the wire prepared in the step (6) after solution treatment, wherein the solution temperature is 815 ℃, and the heat preservation time is 15-30 min.

8) Polishing of

Polishing the surface of the straightened wire material obtained in the step 7

And (5) mm finished wire.

9) Heat treatment and Performance testing

Randomly taking two wires to grade the grain size, wherein the grade result is 7.5-8.0; the wires were subjected to mechanical property testing after 16h aging treatment at 550 ℃ and shown in Table 3.

TABLE 3 Phi 4.0mmTB3 titanium alloy wire material room temperature mechanical property

Example 4

Preparing a phi 5.0mmTB3 titanium alloy wire:

1) homogenizing annealing

2) Cogging forging

3) Forging of intermediate blank

4) Finish forging

5) Rolling of

And (4) heating the bar prepared in the step (4) to 740 ℃, keeping the temperature for 60min, rolling the bar into a bar with the diameter of 9.5mm, removing oxide skin on the surface by using a centerless lathe, and grinding surface cracks by using an abrasive machine.

6) Drawing

And (4) heating the bar material prepared in the step (5) to 720 ℃, keeping the temperature for 30min, drawing the bar material into a wire material with the phi of 5.5mm, and blanking according to a fixed length.

7) On-line solid solution and straightening

8) Polishing of

Polishing the surface of the straightened wire material obtained in the step 7

9) Heat treatment and Performance testing

Randomly taking two wires to grade the grain size, wherein the grade result is 7.0-7.5; the wires were subjected to mechanical property testing after 16h aging treatment at 550 ℃ and are shown in Table 4.

TABLE 4 Phi 5.0mmTB3 titanium alloy wire material room temperature mechanical property

Example 5

1) Homogenizing annealing

Heating the TB3 titanium alloy ingot to 1150 ℃, and preserving heat for 150min for carrying out homogenization annealing treatment.

2) Cogging forging

And (3) cooling the furnace to 1050 ℃ after annealing treatment in the step (1), preserving heat for 30min, then cogging and forging to form a square billet, wherein the finish forging temperature is more than or equal to 800 ℃, and cooling by water after forging. And removing cracks on the surface of the forging by adopting a polishing mode after the forging is finished.

3) Forging of intermediate blank

And (3) heating the square billet subjected to cogging forging in the step (2) to 900 ℃, preserving heat for 130min, carrying out upsetting and drawing forging for 2-3 times, carrying out two-upsetting and two-drawing during forging, wherein the upsetting ratio is 1.6-2.0, the final forging temperature is more than or equal to 650 ℃, and carrying out water cooling after forging. And then heating to 810 ℃ for drawing out and forging the round piece, wherein the finish forging temperature is more than or equal to 650 ℃, and water cooling is carried out after forging to obtain the bar with the diameter of 130 mm. Meanwhile, after each fire forging, the grinding mode is adopted to remove cracks on the surface of the forging.

4) Finish forging

And (3) heating the bar prepared in the step (3) to 780 ℃, preserving heat for 90min, performing precision forging to obtain a bar with phi 85mm, wherein the finish forging temperature is more than or equal to 650 ℃, and performing air cooling after forging. And removing cracks on the surface of the forging by adopting a polishing mode.

5) Rolling of

And (4) heating the bar prepared in the step (4) to 740 ℃, keeping the temperature for 60min, rolling the bar into a bar with the phi of 9.0mm, removing oxide skin on the surface by using a centerless lathe, and grinding surface cracks by using an abrasive machine.

6) Drawing

And (3) heating the bar material prepared in the step (5) to 730 ℃, keeping the temperature for 30min, drawing the bar material into a wire material with the diameter of 3.5mm, and blanking according to a fixed length.

7) On-line solid solution and straightening

And (4) straightening the wire prepared in the step (6) after solution treatment, wherein the solution temperature is 800 ℃, and the heat preservation time is 30 min.

8) Polishing of

Polishing the surface of the straightened wire material obtained in the step 7

The finished wire has surface roughness less than or equal to 1.2 microns and straightness less than or equal to 1.0mm/m)。

Example 6

1) Homogenizing annealing

Heating the TB3 titanium alloy ingot to 1160 ℃, and preserving heat for 140min for carrying out homogenization annealing treatment.

2) Cogging forging

And (3) cooling the furnace to 1020 ℃ after annealing treatment in the step (1), preserving heat for 50min, then cogging and forging to form a square billet, wherein the finish forging temperature is more than or equal to 800 ℃, and cooling by water after forging. And removing cracks on the surface of the forging by adopting a polishing mode after the forging is finished.

3) Forging of intermediate blank

And (3) heating the square billet subjected to cogging forging in the step (2) to 800 ℃, keeping the temperature for 150min, carrying out upsetting and drawing forging for 2-3 times, carrying out two-upsetting and two-drawing during forging, wherein the upsetting ratio is 1.6-2.0, the final forging temperature is more than or equal to 650 ℃, and cooling with water after forging. And then heating to 800 ℃ for drawing out and forging the round piece, wherein the finish forging temperature is more than or equal to 650 ℃, and water cooling is carried out after forging to obtain the bar with the diameter of 140 mm. Meanwhile, after each fire forging, the grinding mode is adopted to remove cracks on the surface of the forging.

4) Finish forging

And (3) heating the bar prepared in the step (3) to 790 ℃, keeping the temperature for 80min, performing precision forging to obtain a bar with the phi of 90mm, performing finish forging at the temperature of more than or equal to 650 ℃, and performing air cooling after forging. And removing cracks on the surface of the forging by adopting a polishing mode.

5) Rolling of

And (4) heating the bar prepared in the step (4) to 750 ℃, keeping the temperature for 55min, rolling the bar into a bar with the phi of 9.2mm, removing oxide skin on the surface by using a centerless lathe, and grinding surface cracks by using an abrasive machine.

6) Drawing

And (4) heating the bar material prepared in the step (5) to 740 ℃, keeping the temperature for 30min, drawing the bar material into a wire material with the diameter of 4.5mm, and blanking according to a fixed length.

7) On-line solid solution and straightening

And (4) straightening the wire prepared in the step (6) after solution treatment, wherein the solution temperature is 810 ℃, and the heat preservation time is 15 min.

8) Polishing of

Polishing the surface of the straightened wire material obtained in the step 7

The surface roughness of the finished wire is less than or equal to 1.2 mu m, and the straightness is less than or equal to 1.0 mm/m).

Example 7

1) Homogenizing annealing

Heating the TB3 titanium alloy ingot to 1170 ℃, and carrying out homogenization annealing treatment by keeping the temperature for 120 min.

2) Cogging forging

And (3) cooling the furnace to 1030 ℃ after annealing treatment in the step (1), preserving heat for 40min, then cogging and forging to form a square billet, wherein the finish forging temperature is more than or equal to 800 ℃, and cooling by water after forging. And removing cracks on the surface of the forging by adopting a polishing mode after the forging is finished.

3) Forging of intermediate blank

And (3) heating the square billet subjected to cogging forging in the step (2) to 950 ℃, preserving heat for 120min, carrying out upsetting and drawing forging for 2-3 times, carrying out two-upsetting and two-drawing during forging, wherein the upsetting ratio is 1.6-2.0, the final forging temperature is more than or equal to 650 ℃, and carrying out water cooling after forging. And then heating to 800 ℃ for drawing out and forging the round piece, wherein the finish forging temperature is more than or equal to 650 ℃, and water cooling is carried out after forging to obtain the bar with the phi of 120 mm. Meanwhile, after each fire forging, the grinding mode is adopted to remove cracks on the surface of the forging.

4) Finish forging

And (3) heating the bar prepared in the step (3) to 770 ℃, keeping the temperature for 100min, performing precision forging to obtain a bar with phi 87mm, wherein the final forging temperature is more than or equal to 650 ℃, and performing air cooling after forging. And removing cracks on the surface of the forging by adopting a polishing mode.

5) Rolling of

And (4) heating the bar prepared in the step (4) to 760 ℃, keeping the temperature for 50min, rolling the bar into a bar with the diameter of 9.4mm, removing oxide skin on the surface by using a centerless lathe, and grinding surface cracks by using an abrasive machine.

6) Drawing

And (4) heating the bar material prepared in the step (5) to 720 ℃, keeping the temperature for 30min, drawing the bar material into a wire material with the diameter of 5.5mm, and blanking according to a fixed length.

7) On-line solid solution and straightening

And (4) straightening the wire prepared in the step (6) after solution treatment, wherein the solution temperature is 815 ℃, and the heat preservation time is 30 min.

8) Polishing of

Polishing the surface of the straightened wire material obtained in the step 7

Example 8

1) Homogenizing annealing

Heating the TB3 titanium alloy ingot to 1165 ℃, and preserving heat for 130min for carrying out homogenization annealing treatment.

2) Cogging forging

And (3) cooling the furnace to 1000 ℃ after annealing treatment in the step (1), preserving heat for 60min, then cogging and forging to form a square billet, wherein the finish forging temperature is more than or equal to 800 ℃, and cooling by water after forging. And removing cracks on the surface of the forging by adopting a polishing mode after the forging is finished.

3) Forging of intermediate blank

And (3) heating the square billet subjected to cogging forging in the step (2) to 850 ℃, keeping the temperature for 140min, carrying out upsetting forging for 2-3 times, carrying out two-upsetting and two-drawing forging at the forging temperature of more than or equal to 650 ℃, and carrying out water cooling after forging, wherein the upsetting ratio is 1.6-2.0. And then heating to 820 ℃ for drawing out and forging, wherein the finish forging temperature is more than or equal to 650 ℃, and water cooling is carried out after forging to obtain the bar with the phi of 125 mm. Meanwhile, after each fire forging, the grinding mode is adopted to remove cracks on the surface of the forging.

4) Finish forging

And (3) heating the bar prepared in the step (3) to 775 ℃, keeping the temperature for 90min, performing precision forging to obtain a bar with phi 86mm, wherein the finish forging temperature is more than or equal to 650 ℃, and performing air cooling after forging. And removing cracks on the surface of the forging by adopting a polishing mode.

5) Rolling of

And (4) heating the bar prepared in the step (4) to 760 ℃, keeping the temperature for 50min, rolling the bar into a bar with the diameter of 9.5mm, removing oxide skin on the surface by using a centerless lathe, and grinding surface cracks by using an abrasive machine.

6) Drawing

7) On-line solid solution and straightening

And (4) straightening the wire prepared in the step (6) after solution treatment, wherein the solution temperature is 815 ℃, and the heat preservation time is 20 min.

8) Polishing of

Polishing the surface of the straightened wire material obtained in the step 7 The surface roughness of the finished wire is less than or equal to 1.2 mu m, and the straightness is less than or equal to 1.0 mm/m). The invention adopts the process methods of free forging, finish forging, rolling and drawing, and is matched with a heat treatment process to obtain the finished product of the TB3 titanium alloy wire with the specification of phi 3 mm-phi 5mm, the tensile strength of over 1100MPa after aging treatment, the elongation of over 6 percent, the shear strength of over 700MPa and the grain size of over 7 grades.

The invention adopts the processing technology of free forging, finish forging, rolling and re-drawing to replace the original technological method of free forging, hot rolling and rotary forging. After the precision forging, the rolling with large deformation is carried out, the rolling deformation is more than 80%, and the crystal grains can be effectively refined to obtain fine equiaxial structures, so that the mechanical property of the material is improved. The subsequent drawing is adopted to further control the surface quality (the surface roughness is less than or equal to 1.2 mu m and the straightness is less than or equal to 1.0mm/m) and the dimensional precision (the dimensional deviation is

) Thus obtaining the TB3 titanium alloy wire with excellent structure performance. The tensile strength of the TB3 titanium alloy wire prepared by the method can reach more than 1100MPa, the elongation of more than 6 percent, the shear strength of more than 700MPa and the TB3 titanium alloy wire with the grain size of more than 7 grades.

Claims

1. A method for preparing a TB3 titanium alloy wire for a fastener is characterized by comprising the following steps:

1) homogenizing annealing

2) cogging forging

3) forging of intermediate blank

4) finish forging

5) rolling of

6) drawing

7) on-line solid solution and straightening

2. The method for preparing the TB3 titanium alloy wire for the fasteners according to claim 1, wherein the specific conditions of the homogenizing annealing treatment in the step 1) are as follows: heating to 1150-1170 ℃, and preserving the heat for 120-150 min.

3. The method for preparing the TB3 titanium alloy wire for the fastener according to claim 1, wherein in the step 2), the heating temperature is 1000-1050 ℃, the heat preservation time is 30-60 min, the final forging temperature of forging is more than or equal to 800 ℃, and water cooling is carried out after forging.

4. The method for preparing the TB3 titanium alloy wire for the fastener according to claim 1, wherein in the step 3), the heating temperature is 800-950 ℃, the heat preservation time is 120-150 min, the final forging temperature of forging is more than or equal to 650 ℃, and water cooling is carried out after forging.

5. The method for preparing a TB3 titanium alloy wire for fasteners according to claim 1, wherein in step 3), two upsetting and two drawing are adopted for each hot forging, the upsetting ratio is 1.6-2.0, and the wire is rolled into a rod by the last hot drawing.

6. The method for preparing a TB3 titanium alloy wire for fasteners according to claim 1, wherein the forging is performed by heating 3 to 4 times in step 3).

7. The method for preparing the TB3 titanium alloy wire for the fastener according to claim 1, wherein in the step 4), the heating temperature is 770-790 ℃, the heat preservation time is 80-100 min, the finish forging temperature of finish forging is more than or equal to 650 ℃, and air cooling is carried out after forging.

8. The method for preparing the TB3 titanium alloy wire for the fastener according to claim 1, wherein in the step 5), the heating temperature is 740 to 760 ℃ and the holding time is 50 to 60 min.

9. The method for preparing the TB3 titanium alloy wire for the fasteners according to claim 1, wherein in the step 6), the heating temperature is 720-740 ℃ and the holding time is 30 min.

10. The method for preparing the TB3 titanium alloy wire for the fasteners according to claim 1, wherein in the step 7), the solid solution temperature is 800-815 ℃ and the heat preservation time is 15-30 min.