阅读说明：本技术 一种ta15钛合金薄带材的制备方法 (Preparation method of TA15 titanium alloy thin strip ) 是由 王国栋 薛少博 田云飞 徐海龙 苏艳妮 张国霞 王成长 周立鹏 郭学鹏 舒滢 吴 于 2021-08-31 设计创作，主要内容包括：本发明公开了一种TA15钛合金薄带材的制备方法,该方法包括：一、第一轧程单片可逆式热轧；二、对焊；三、碱酸洗和纵剪分条处理后真空退火热处理；四、第二轧程可逆式带材轧制；五、清洗、纵剪分条处理后真空退火热处理；六、第三轧程可逆式带材轧制；七、清洗、纵剪分条处理后真空退火热处理；八、第四轧程可逆式带材轧制；九、清洗和纵剪分条处理；十、退火处理得到TA15钛合金薄带材。本发明采用四辊可逆式热轧机与森吉米尔二十辊冷轧机,结合板材激光对焊,依次进行一个热轧轧程和三个冷轧轧程的轧制,提高了轧制效率,提升成品率并降低成本减少了轧程数量,保证了厚度为0.3mm～0.6mm的TA15钛合金薄带材的厚度精度。(The invention discloses a preparation method of a TA15 titanium alloy thin strip, which comprises the following steps: firstly, carrying out single-sheet reversible hot rolling in a first rolling process; secondly, butt welding; thirdly, carrying out vacuum annealing heat treatment after alkali pickling and longitudinal shearing slitting treatment; fourthly, rolling the strip in a reversible way in the second rolling process; fifthly, vacuum annealing heat treatment is carried out after cleaning, longitudinal shearing and splitting treatment; sixth, the third rolling process can be used for rolling the strip reversibly; seventhly, vacuum annealing heat treatment is carried out after cleaning and longitudinal shearing slitting treatment; eighth and fourth reversible strip rolling; ninth, cleaning and slitting treatment; and tenthly, annealing to obtain the TA15 titanium alloy thin strip. The invention adopts the four-roller reversible hot rolling mill and the Sendzimir twenty-roller cold rolling mill, combines the laser butt welding of plates, and sequentially performs the rolling of one hot rolling process and three cold rolling processes, thereby improving the rolling efficiency, improving the yield, reducing the cost, reducing the number of the rolling processes and ensuring the thickness precision of the TA15 titanium alloy thin strip with the thickness of 0.3 mm-0.6 mm.)

1. A method for producing a TA15 titanium alloy thin strip, comprising the steps of:

step one, carrying out first-pass single-sheet reversible hot rolling on an incoming TA15 plate by using a four-roller reversible hot rolling mill to obtain a first-pass TA15 strip; the thickness of the supplied material TA15 board is 2 mm-3 mm, the width is 500 mm-550 mm, and the length is 3000 mm-4000 mm; the thickness of the first rolling process TA15 strip is 1 mm-1.2 mm, the width is 500 mm-550 mm, and the length is 6000 mm-8000 mm;

step two, carrying out butt welding on two ends of the first rolling process TA15 strip obtained in the step one by adopting a laser welding method to obtain a first rolling process TA15 welding strip;

step three, carrying out alkali pickling on the first rolling process TA15 welding strip obtained in the step two, then carrying out longitudinal shearing and splitting treatment by using a longitudinal shearing and splitting machine to remove burrs and cracks, and then carrying out vacuum annealing heat treatment; the width of the first rolling process TA15 welding strip after slitting is 490-540 mm; the temperature of the vacuum annealing heat treatment is 920-950 ℃, the heat preservation time is 60-90 min, and the vacuum degree is not less than 7 multiplied by 10^-3MPa；

Step four, performing second-rolling reversible strip rolling on the first-rolling TA15 welded strip subjected to vacuum annealing heat treatment in the step three by using a Sendzimir twenty-roller cold rolling mill to obtain a second-rolling TA15 strip; the pass processing rate of the second reversible rolling strip is 6-8%; the thickness of the strip material in the second rolling process TA15 is 0.7 mm-0.9 mm;

step five, cleaning the strip material obtained in the step four and obtained in the second rolling process TA15, then performing longitudinal shearing and slitting treatment by using a longitudinal shearing and slitting machine to remove burrs and cracks, and then performing vacuum annealing heat treatment; the cleaning process comprises the following steps: firstly, ultrasonic cleaning agent and clear water are usedRemoving rolling oil and impurities on the surface of the strip material in the second rolling process TA15, and rinsing twice with warm water; the temperature of the vacuum annealing heat treatment is 920-950 ℃, the heat preservation time is 60-90 min, and the vacuum degree is not less than 7 multiplied by 10^-3MPa; the width of the strip material in the second rolling process TA15 after slitting is 475 mm-525 mm;

sixthly, performing third-rolling reversible strip rolling on the second rolling process TA15 strip subjected to the vacuum annealing heat treatment in the fifth step by using a twenty-high-roll sendzimir cold rolling mill to obtain a third-rolling process TA15 strip; the pass processing rate of the third-rolling reversible strip rolling is 8-10%; the thickness of the strip material in the third rolling process TA15 is 0.65 mm-0.7 mm;

step seven, cleaning the third rolling process TA15 strip obtained in the step six, then carrying out longitudinal shearing and splitting treatment by using a longitudinal shearing and splitting machine to remove burrs and cracks, and then carrying out vacuum annealing heat treatment; the cleaning process comprises the following steps: removing rolling oil and impurities on the surface of the strip material in the second rolling process TA15 by using a mixed solution of an ultrasonic cleaning agent and clear water, and rinsing twice by using warm water; the temperature of the vacuum annealing heat treatment is 920-950 ℃, the heat preservation time is 60-90 min, and the vacuum degree is not less than 7 multiplied by 10^-3MPa; the width of the strip material in the third rolling process TA15 after slitting is 465 mm-515 mm;

eighthly, performing fourth-rolling reversible strip rolling on the third-rolling-process TA15 strip subjected to the vacuum annealing heat treatment in the seventeenth step by using a Sendzimir twenty-roller cold rolling mill to obtain a fourth-rolling-process TA15 strip; the pass processing rate of the fourth-rolling reversible strip rolling is 8-10%; the thickness of the strip material in the fourth rolling process TA15 is 0.3 mm-0.6 mm;

step nine, cleaning the strip material obtained in the step eight and obtained in the fourth rolling process TA15, and then performing longitudinal shearing and splitting treatment by using a longitudinal shearing and splitting machine to remove burrs and cracks; the cleaning process comprises the following steps: removing rolling oil and impurities on the surface of the TA15 strip in the fourth rolling process by using a mixed solution of an ultrasonic cleaning agent and clear water, and rinsing twice by using warm water; the width of the strip material in the fourth rolling process TA15 after slitting is 450-500 mm;

step ten, annealing the strip TA15 in the fourth rolling process obtained in the step nine by using a continuous online heat treatment furnace to obtain a TA15 titanium alloy thin strip; the protective gas adopted by the continuous on-line heat treatment furnace is argon with the mass purity of 99.999%, and the thickness of the TA15 titanium alloy thin strip is 0.3-0.6 mm.

2. The method for preparing the TA15 titanium alloy thin strip according to claim 1, wherein the first single-pass reversible hot rolling in the first step has a heating temperature of 930-950 ℃ and a holding time of 30-60 min.

3. The method for preparing the TA15 titanium alloy thin strip as claimed in claim 1, wherein in the first step, the incoming material TA15 plate has a mass content of iron not more than 0.18% and a mass content of oxygen not more than 0.13%.

4. The method of claim 1 wherein said twenty Sendzimir roll cold rolling mill has roll system composition of all of steps four, six and eight: the upper idler roller and the lower idler roller are both flat rollers, the upper first middle roller and the lower first middle roller are both convex rollers, and the working roller is a flat roller.

5. The method for preparing the TA15 titanium alloy thin strip according to claim 1, wherein in the second step, 4-6 first rolling TA15 strips are assembled into 1 first rolling TA15 welding strip, and the welding seam is ground and polished.

Technical Field

The invention belongs to the technical field of titanium alloy section bar preparation, and particularly relates to a preparation method of a TA15 titanium alloy thin strip.

Background

With the continuous progress of the human aviation industry, the requirement on the aviation aircraft is higher and higher. The aviation aircraft usually has a severe service environment and works under extreme conditions of ultrahigh temperature, ultralow temperature, vacuum, high stress, high corrosion and the like, so that the aircraft is required to have a reliable structural design and has higher requirements on the strength, hardness, high temperature resistance and corrosion resistance of materials.

The TA15 titanium alloy has higher specific strength and high-temperature strength at the service temperature of 450-500 ℃, the comprehensive performance of the TA15 titanium alloy is slightly higher than that of TC4 titanium alloy, and the TA15 titanium alloy can be used as a titanium alloy material for an airplane structure and is also a key construction for engine casings and welding bearing. The TA15 titanium alloy has high strength, poor plasticity and other characteristics, so that the preparation difficulty of the thin strip is high, and the yield is low. Therefore, the application and popularization in the high-end aviation field are limited.

The TA15 titanium alloy strip is rolled to be thinner and wider, and can better adapt to the faster, higher and larger development of the aviation aircraft in the future. At present, due to the limitations of rolling technology and alloy characteristics. At present, TA15 medium-thickness plates and strips are mainly on the market, but the technology for preparing TA15 alloy thin strips with the thickness less than 0.8mm is not mature. A patent with the application number of 202010669587.0 discloses a method for preparing a medium-thickness TA15 titanium alloy plate in a fine-grain superplastic TA15 titanium alloy processing method, wherein a TA15 titanium alloy ingot is prepared into a TA15 titanium alloy medium-thickness plate with the thickness of 10-25 mm through smelting, forging and rolling, but the thickness is not less than 0.8 mm. The patent with the application number of 201410235456.6 discloses a preparation method of a TA15 titanium alloy sheet in a processing method of a fine-grain superplastic TA15 titanium alloy sheet, and a TA15 titanium alloy plate with the thickness of 0.5 mm-1.4 mm is obtained by a preparation method of two times of hot rolling and one time of lap rolling.

Disclosure of Invention

The technical problem to be solved by the present invention is to provide a method for preparing a TA15 titanium alloy thin strip, aiming at the above-mentioned deficiencies of the prior art. The method adopts a four-roller reversible hot rolling mill and a Sendzimir twenty-roller cold rolling mill as rolling equipment, combines a plate laser butt welding method, and sequentially performs rolling in one hot rolling process and three cold rolling processes, thereby improving the rolling efficiency, improving the yield, reducing the cost, reducing the number of the rolling processes, ensuring the thickness precision of the TA15 titanium alloy thin strip, and obtaining the TA15 titanium alloy thin strip with the thickness of 0.3-0.6 mm.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a method for producing a TA15 titanium alloy thin strip, comprising the steps of:

step one, carrying out first-pass single-sheet reversible hot rolling on an incoming TA15 plate by using a four-roller reversible hot rolling mill to obtain a first-pass TA15 strip; the thickness of the supplied material TA15 board is 2 mm-3 mm, the width is 500 mm-550 mm, and the length is 3000 mm-4000 mm; the thickness of the first rolling process TA15 strip is 1 mm-1.2 mm, the width is 500 mm-550 mm, and the length is 6000 mm-8000 mm;

step two, carrying out butt welding on two ends of the first rolling process TA15 strip obtained in the step one by adopting a laser welding method to obtain a first rolling process TA15 welding strip;

step three, carrying out alkali pickling on the first rolling process TA15 welding strip obtained in the step two, then carrying out longitudinal shearing and splitting treatment by using a longitudinal shearing and splitting machine to remove burrs and cracks, and then carrying out vacuum annealing heat treatment; the width of the first rolling process TA15 welding strip after slitting is 490-540 mm; the temperature of the vacuum annealing heat treatment is 920-950 ℃, the heat preservation time is 60-90 min, and the vacuum degree is not less than 7 multiplied by 10^-3MPa；

Step four, performing second-rolling reversible strip rolling on the first-rolling TA15 welded strip subjected to vacuum annealing heat treatment in the step three by using a Sendzimir twenty-roller cold rolling mill to obtain a second-rolling TA15 strip; the pass processing rate of the second reversible rolling strip is 6-8%; the thickness of the strip material in the second rolling process TA15 is 0.7 mm-0.9 mm;

step five, cleaning the strip material obtained in the step four and obtained in the second rolling process TA15, then performing longitudinal shearing and slitting treatment by using a longitudinal shearing and slitting machine to remove burrs and cracks, and then performing vacuum annealing heat treatment; the cleaning process comprises the following steps: removing rolling oil and impurities on the surface of the strip material in the second rolling process TA15 by using a mixed solution of an ultrasonic cleaning agent and clear water, and rinsing twice by using warm water; the temperature of the vacuum annealing heat treatment is 920-950 ℃, the heat preservation time is 60-90 min, and the vacuum degree is not less than 7 multiplied by 10^-3MPa; second rolling after slittingThe width of the strip material in the process TA15 is 475 mm-525 mm;

sixthly, performing third-rolling reversible strip rolling on the second rolling process TA15 strip subjected to the vacuum annealing heat treatment in the fifth step by using a twenty-high-roll sendzimir cold rolling mill to obtain a third-rolling process TA15 strip; the pass processing rate of the third-rolling reversible strip rolling is 8-10%; the thickness of the strip material in the third rolling process TA15 is 0.65 mm-0.7 mm;

step seven, cleaning the third rolling process TA15 strip obtained in the step six, then carrying out longitudinal shearing and splitting treatment by using a longitudinal shearing and splitting machine to remove burrs and cracks, and then carrying out vacuum annealing heat treatment; the cleaning process comprises the following steps: removing rolling oil and impurities on the surface of the strip material in the second rolling process TA15 by using a mixed solution of an ultrasonic cleaning agent and clear water, and rinsing twice by using warm water; the temperature of the vacuum annealing heat treatment is 920-950 ℃, the heat preservation time is 60-90 min, and the vacuum degree is not less than 7 multiplied by 10^-3MPa; the width of the strip material in the third rolling process TA15 after slitting is 465 mm-515 mm;

eighthly, performing fourth-rolling reversible strip rolling on the third-rolling-process TA15 strip subjected to the vacuum annealing heat treatment in the seventeenth step by using a Sendzimir twenty-roller cold rolling mill to obtain a fourth-rolling-process TA15 strip; the pass processing rate of the fourth-rolling reversible strip rolling is 8-10%; the thickness of the strip material in the fourth rolling process TA15 is 0.3 mm-0.6 mm;

step nine, cleaning the strip material obtained in the step eight and obtained in the fourth rolling process TA15, and then performing longitudinal shearing and splitting treatment by using a longitudinal shearing and splitting machine to remove burrs and cracks; the cleaning process comprises the following steps: removing rolling oil and impurities on the surface of the TA15 strip in the fourth rolling process by using a mixed solution of an ultrasonic cleaning agent and clear water, and rinsing twice by using warm water; the width of the strip material in the fourth rolling process TA15 after slitting is 450-500 mm;

step ten, annealing the strip TA15 in the fourth rolling process obtained in the step nine by using a continuous online heat treatment furnace to obtain a TA15 titanium alloy thin strip; the protective gas adopted by the continuous on-line heat treatment furnace is argon with the mass purity of 99.999%, and the thickness of the TA15 titanium alloy thin strip is 0.3-0.6 mm.

The invention adopts a four-roll reversible hot rolling mill and a Sendzimir twenty-roll cold rolling mill as rolling equipment, combines a plate laser butt welding method, sequentially performs rolling of a hot rolling process and three cold rolling processes on a TA15 plate with the thickness of 2 mm-3 mm, the width of 500 mm-550 mm and the length of 3000 mm-4000 mm, firstly welds a first rolling process TA15 strip obtained by hot rolling by the laser butt welding method to form a first rolling process TA15 welding strip, so that the original plate rolling is changed into strip rolling, thereby not only improving the rolling efficiency, but also being beneficial to improving the yield and reducing the cost, then utilizes the advantages of large rolling force and high rolling precision of the Sendzimir twenty-roll cold rolling mill, improves the pass deformation by designing a reasonable rolling process, reduces the number of the rolling processes, ensures the thickness precision of the TA15 titanium alloy thin strip, and reasonably eliminates the internal stress of the TA15 titanium alloy strip tissue by an annealing process in time, finally obtaining the TA15 titanium alloy thin strip with the thickness of 0.3 mm-0.6 mm.

The preparation method of the TA15 titanium alloy thin strip is characterized in that in the first step, the heating temperature of the first rolling pass single-sheet reversible hot rolling is 930-950 ℃, and the heat preservation time is 30-60 min.

The preparation method of the TA15 titanium alloy thin strip is characterized in that in the first step, the incoming TA15 plate contains iron with a mass content not greater than 0.18% and oxygen with a mass content not greater than 0.13%. The content of the impurity elements of the TA15 sheet is limited, so that the quality of the TA15 sheet is ensured from the source, and the deviation of the preparation process is reduced, thereby improving the accuracy of the rolling process and ensuring the smooth operation of the TA15 thin strip preparation process.

The preparation method of the TA15 titanium alloy thin strip is characterized in that the roll system components of the Sendzimir twenty-roll cold rolling mill in the fourth step, the sixth step and the eighth step are as follows: the upper idler roller and the lower idler roller are both flat rollers, the upper first middle roller and the lower first middle roller are both convex rollers, and the working roller is a flat roller. The four-roll reversible hot rolling mill is matched with the Sendzimir twenty-roll cold rolling mill with the composition structure, so that the processing procedure of rolling the TA15 titanium alloy thin strip is reduced, the yield is improved, and finally the TA15 titanium alloy thin strip with excellent performance, flat plate shape and better surface quality is obtained.

The preparation method of the TA15 titanium alloy thin strip is characterized in that in the second step, 4-6 first rolling process TA15 strips are assembled into 1 first rolling process TA15 welding strip, and the welding seam is ground and polished.

Compared with the prior art, the invention has the following advantages:

1. the invention adopts the four-roller reversible hot rolling mill and the Sendzimir twenty-roller cold rolling mill as rolling equipment, combines a plate laser butt welding method, and sequentially performs the rolling of one hot rolling process and three cold rolling processes, thereby improving the rolling efficiency, improving the yield, reducing the cost, reducing the number of the rolling processes, ensuring the thickness precision of the TA15 titanium alloy thin strip, and obtaining the TA15 titanium alloy thin strip with the thickness of 0.3-0.6 mm.

2. The method changes the original plate rolling into strip rolling by a laser butt welding method, has reasonable process design and strong operability, effectively improves the preparation efficiency of the TA15 titanium alloy thin strip, and ensures that the prepared TA15 titanium alloy thin strip has good surface quality and high thickness dimension precision.

3. The invention combines the advantages of large rolling force, high rolling precision and the like of the Sendzimir twenty-roller cold rolling mill with the reasonable design of the hot rolling process, reduces the intermediate rolling process for preparing the TA15 titanium alloy thin strip, improves the thickness precision of the TA15 titanium alloy thin strip and realizes the thinning of the TA15 titanium alloy thin strip.

4. The invention strictly controls the pass deformation of hot rolling in the first rolling process, namely the high-temperature characteristic of the TA15 plate, performs large-deformation rolling in the first to third rolling processes to fully damage internal crystal grains, and then adopts a small-deformation multi-pass processing mode in the cold rolling in the second rolling process, the third rolling process and the fourth rolling process to realize the thinning of the TA15 titanium alloy thin strip and prevent the edge of the TA15 titanium alloy thin strip from generating cracks due to the excessive pass deformation.

5. Compared with the method for preparing the TA15 titanium alloy sheet/strip by pack rolling, the method has the advantages of high yield, lower cost, shorter preparation period and easy popularization and application.

The technical solution of the present invention is further described in detail by the accompanying drawings and examples.

Drawings

FIG. 1 is a process flow diagram of the method for producing TA15 titanium alloy thin strip of the present invention.

FIG. 2 is a photograph of the metallographic structure of a thin strip of TA15 titanium alloy produced in example 1 of the present invention.

FIG. 3 is a photograph of the metallographic structure of a thin strip of TA15 titanium alloy produced in example 2 of the present invention.

FIG. 4 is a photograph of the metallographic structure of a thin strip of TA15 titanium alloy produced in example 3 of the invention.

FIG. 5 is a photograph of the metallographic structure of a thin strip of TA15 titanium alloy produced in example 4 of the present invention.

Detailed Description

Example 1

As shown in fig. 1, the present embodiment includes the following steps:

step one, placing a TA15 plate with the thickness of 2mm, the width of 500mm and the length of 3000mm in a heating furnace, heating and preserving heat for 30min at 930 ℃, and then performing first-pass single-sheet reversible hot rolling by adopting a four-roller reversible hot rolling mill to obtain a first-pass TA15 strip; the thickness of the first rolling process TA15 strip is 1mm, the width is 500mm, and the length is 6000 mm; the TA15 sheet material contains 0.12% by mass of iron and 0.09% by mass of oxygen;

step two, carrying out butt welding on two ends of 4 first rolling process TA15 strips obtained in the step one by adopting a laser welding method, and carrying out grinding and polishing treatment on the welding seams to obtain 1 first rolling process TA15 welding strip;

step three, carrying out alkali pickling on the first rolling process TA15 welding strip obtained in the step two, then carrying out longitudinal shearing and splitting treatment by using a longitudinal shearing and splitting machine to remove burrs and cracks until the width is 490mm, and then carrying out vacuum annealing heat treatment at the temperature of 920 ℃, the heat preservation time is 60min, and the vacuum degree is not lower than 7 x 10^-3MPa；

Step four, performing second-rolling reversible strip rolling on the first-rolling-process TA15 welded strip subjected to vacuum annealing heat treatment in the step three by using a Sendzimir twenty-roller cold rolling mill, wherein the adopted pass processing rate is 6%, and a second-rolling-process TA15 strip with the thickness of 0.7mm is obtained;

step five, cleaning the second rolling process TA15 strip obtained in the step four by using a mixed solution of an ultrasonic cleaning agent and clean water to remove rolling oil and impurities on the surface, rinsing the strip twice by using warm water, performing longitudinal shearing and slitting treatment by using a longitudinal shearing slitting machine to remove burrs and cracks until the width is 475mm, and performing vacuum annealing heat treatment at 920 ℃ for 60min under the condition that the vacuum degree is not lower than 7 multiplied by 10^-3MPa；

Sixthly, performing third-rolling reversible strip rolling on the second-rolling-process TA15 strip subjected to the vacuum annealing heat treatment in the fifth step by using a Sendzimir twenty-roller cold rolling mill, wherein the adopted pass processing rate is 8 percent, so as to obtain a third-rolling-process TA15 strip with the thickness of 0.65 mm;

step seven, cleaning the third rolling process TA15 strip obtained in the step six by using a mixed solution of an ultrasonic cleaning agent and clear water to remove rolling oil and impurities on the surface, rinsing the strip twice by using warm water, performing longitudinal shearing and slitting treatment by using a longitudinal shearing and slitting machine to remove burrs and cracks until the width is 465mm, and performing vacuum annealing heat treatment at the temperature of 920 ℃ for 60min under the vacuum degree of not less than 7 multiplied by 10^-3MPa；

Eighthly, performing fourth-rolling reversible strip rolling on the third-rolling TA15 strip subjected to the vacuum annealing heat treatment in the seventeenth step by using a Sendzimir twenty-roller cold rolling mill, wherein the adopted pass processing rate is 8 percent, and obtaining a fourth-rolling TA15 strip with the thickness of 0.3 mm;

the roller system of the Sendzimir twenty-roller cold rolling mill in the fourth step, the sixth step and the eighth step all comprises the following components: the upper idler roller and the lower idler roller are both flat rollers, the upper first middle roller and the lower first middle roller are both convex rollers, and the working roller is a flat roller;

step nine, cleaning the fourth rolling process TA15 strip obtained in the step eight by using a mixed solution of an ultrasonic cleaning agent and clean water to remove rolling oil and impurities on the surface, rinsing the strip twice by using warm water, and then performing longitudinal shearing and slitting treatment by using a longitudinal shearing and slitting machine to remove burrs and cracks until the width is 450 mm;

step ten, annealing the fourth rolling process TA15 strip obtained in the step nine at 870 ℃ by adopting a continuous online heat treatment furnace under the protection of argon with the mass purity of 99.999 percent to obtain a TA15 titanium alloy thin strip with the thickness of 0.3mm and the width of 450 mm.

Fig. 2 is a metallographic photograph of a TA15 titanium alloy thin strip prepared in this example, and it can be seen from fig. 2 that the TA15 titanium alloy thin strip has a uniform structure and fine crystal grains.

Example 2

As shown in fig. 1, the present embodiment includes the following steps:

step one, placing a TA15 plate with the thickness of 3mm, the width of 550mm and the length of 4000mm in a heating furnace, heating and preserving heat for 60min at 950 ℃, and then performing first-pass single-sheet reversible hot rolling by adopting a four-roller reversible hot rolling mill to obtain a first-pass TA15 strip; the thickness of the first rolling process TA15 strip is 1.2mm, the width is 550mm, and the length is 8000 mm; the TA15 sheet material contains 0.16% by mass of iron and 0.08% by mass of oxygen;

step two, carrying out butt welding on two ends of 6 first rolling process TA15 strips obtained in the step one by adopting a laser welding method, and carrying out grinding and polishing treatment on the welding seams to obtain 1 first rolling process TA15 welding strip;

step three, carrying out alkali pickling on the first rolling process TA15 welding strip obtained in the step two, then carrying out longitudinal shearing and splitting treatment by using a longitudinal shearing and splitting machine to remove burrs and cracks until the width is 540mm, and then carrying out vacuum annealing heat treatment, wherein the temperature of the vacuum annealing heat treatment is 950 ℃, the heat preservation time is 90min, and the vacuum degree is not lower than 7 x 10^-3MPa；

Step four, performing second-rolling reversible strip rolling on the first-rolling-process TA15 welded strip subjected to vacuum annealing heat treatment in the step three by using a Sendzimir twenty-roller cold rolling mill, wherein the adopted pass processing rate is 8 percent, and a second-rolling-process TA15 strip with the thickness of 0.9mm is obtained;

step five, cleaning the second rolling process TA15 strip obtained in the step four by using a mixed solution of an ultrasonic cleaning agent and clean water to remove rolling oil and impurities on the surface, rinsing the strip twice by using warm water, performing longitudinal shearing and splitting treatment by using a longitudinal shearing and splitting machine to remove burrs and cracks until the width is 525mm, and performing vacuum annealing heat treatment at the temperature of 950 ℃ for 60min and at the vacuum degree of not less than 7 multiplied by 10^-3MPa；

Sixthly, performing third-rolling reversible strip rolling on the second-rolling-process TA15 strip subjected to the vacuum annealing heat treatment in the fifth step by using a Sendzimir twenty-roller cold rolling mill, wherein the adopted pass processing rate is 10%, so as to obtain a third-rolling-process TA15 strip with the thickness of 0.7 mm;

step seven, cleaning the third rolling process TA15 strip obtained in the step six by using a mixed solution of an ultrasonic cleaning agent and clean water to remove rolling oil and impurities on the surface, rinsing the strip twice by using warm water, performing longitudinal shearing and slitting treatment by using a longitudinal shearing and slitting machine to remove burrs and cracks until the width is 515mm, and performing vacuum annealing heat treatment at the temperature of 950 ℃ for 60min and at the vacuum degree of not less than 7 multiplied by 10^-3MPa；

Eighthly, performing fourth-rolling reversible strip rolling on the third-rolling TA15 strip subjected to the vacuum annealing heat treatment in the seventeenth step by using a Sendzimir twenty-roller cold rolling mill, wherein the adopted pass processing rate is 10%, and obtaining a fourth-rolling TA15 strip with the thickness of 0.6 mm;

the roller system of the Sendzimir twenty-roller cold rolling mill in the fourth step, the sixth step and the eighth step all comprises the following components: the upper idler roller and the lower idler roller are both flat rollers, the upper first middle roller and the lower first middle roller are both convex rollers, and the working roller is a flat roller;

step nine, cleaning the fourth rolling process TA15 strip obtained in the step eight by using a mixed solution of an ultrasonic cleaning agent and clear water to remove rolling oil and impurities on the surface, rinsing the strip twice by using warm water, and then performing longitudinal shearing and slitting treatment by using a longitudinal shearing and slitting machine to remove burrs and cracks until the width is 500 mm;

step ten, annealing the fourth rolling process TA15 strip obtained in the step nine at 900 ℃ by adopting a continuous online heat treatment furnace under the protection of argon with the mass purity of 99.999 percent to obtain a TA15 titanium alloy thin strip with the thickness of 0.6mm and the width of 500 mm.

Fig. 3 is a metallographic photograph of a TA15 titanium alloy thin strip prepared in this example, and it can be seen from fig. 3 that the TA15 titanium alloy thin strip has a uniform structure and fine crystal grains.

Example 3

As shown in fig. 1, the present embodiment includes the following steps:

step one, placing a TA15 plate with the thickness of 2.2mm, the width of 520mm and the length of 3500mm in a heating furnace, heating and preserving heat for 45min at 930 ℃, and then carrying out first-pass single-sheet reversible hot rolling by adopting a four-roller reversible hot rolling mill to obtain a first-pass TA15 strip; the thickness of the first rolling process TA15 strip is 1.1mm, the width is 520mm, and the length is 7000 mm; the TA15 sheet material contains 0.17% by mass of iron and 0.12% by mass of oxygen;

step two, carrying out butt welding on two ends of 5 first rolling process TA15 strips obtained in the step one by adopting a laser welding method, and carrying out grinding and polishing treatment on the welding seams to obtain 1 first rolling process TA15 welding strip;

step three, carrying out alkali pickling on the first rolling process TA15 welding strip obtained in the step two, then carrying out longitudinal shearing and splitting treatment by using a longitudinal shearing and splitting machine to remove burrs and cracks until the width is 510mm, and then carrying out vacuum annealing heat treatment at the temperature of 930 ℃ for 60min, wherein the vacuum degree is not lower than 7 x 10^-3MPa；

Step four, performing second-rolling reversible strip rolling on the first-rolling-process TA15 welded strip subjected to vacuum annealing heat treatment in the step three by using a Sendzimir twenty-roller cold rolling mill, wherein the adopted pass processing rate is 7 percent, and a second-rolling-process TA15 strip with the thickness of 0.85mm is obtained;

step five, cleaning the second rolling process TA15 strip obtained in the step four by using a mixed solution of an ultrasonic cleaning agent and clean water to remove rolling oil and impurities on the surface, and then rinsing the strip twice by using warm waterThen, a slitting machine is used for slitting to remove burrs and cracks until the width is 505mm, and then vacuum annealing heat treatment is carried out, wherein the temperature of the vacuum annealing heat treatment is 930 ℃, the heat preservation time is 60min, and the vacuum degree is not lower than 7 multiplied by 10^-3MPa；

Sixthly, performing third-rolling reversible strip rolling on the second-rolling-process TA15 strip subjected to the vacuum annealing heat treatment in the fifth step by using a Sendzimir twenty-roller cold rolling mill, wherein the adopted pass processing rate is 9 percent, so as to obtain a third-rolling-process TA15 strip with the thickness of 0.66 mm;

step seven, cleaning the third rolling process TA15 strip obtained in the step six by using a mixed solution of an ultrasonic cleaning agent and clean water to remove rolling oil and impurities on the surface, rinsing the strip twice by using warm water, performing longitudinal shearing and splitting treatment by using a longitudinal shearing and splitting machine to remove burrs and cracks until the width is 495mm, and performing vacuum annealing heat treatment at the temperature of 930 ℃ for 60min under the vacuum degree of not less than 7 multiplied by 10^-3MPa；

Eighthly, performing fourth-rolling reversible strip rolling on the third-rolling TA15 strip subjected to the vacuum annealing heat treatment in the seventeenth step by using a Sendzimir twenty-roller cold rolling mill, wherein the adopted pass processing rate is 9 percent, and obtaining a fourth-rolling TA15 strip with the thickness of 0.47 mm;

the roller system of the Sendzimir twenty-roller cold rolling mill in the fourth step, the sixth step and the eighth step all comprises the following components: the upper idler roller and the lower idler roller are both flat rollers, the upper first middle roller and the lower first middle roller are both convex rollers, and the working roller is a flat roller;

step nine, cleaning the fourth rolling process TA15 strip obtained in the step eight by using a mixed solution of an ultrasonic cleaning agent and clean water to remove rolling oil and impurities on the surface, rinsing the strip twice by using warm water, and then performing longitudinal shearing and slitting treatment by using a longitudinal shearing and slitting machine to remove burrs and cracks until the width is 480 mm;

step ten, annealing the fourth rolling process TA15 strip obtained in the step nine at 880 ℃ by adopting a continuous online heat treatment furnace under the protection of argon with the mass purity of 99.999 percent to obtain a TA15 titanium alloy thin strip with the thickness of 0.47mm and the width of 450 mm.

Fig. 4 is a metallographic photograph of a TA15 titanium alloy thin strip prepared in this example, and it can be seen from fig. 4 that the TA15 titanium alloy thin strip has a uniform structure and fine crystal grains.

Example 4

As shown in fig. 1, the present embodiment includes the following steps:

step one, placing a TA15 plate with the thickness of 2.7mm, the width of 540mm and the length of 3800mm in a heating furnace, heating and preserving heat at 940 ℃ for 45min, and then performing first-rolling single-sheet reversible hot rolling by adopting a four-roller reversible hot rolling mill to obtain a first-rolling TA15 strip; the thickness of the first rolling process TA15 strip is 1.1mm, the width is 540mm, and the length is 7400 mm; the TA15 sheet material contains 0.11% by mass of iron and 0.12% by mass of oxygen;

step two, carrying out butt welding on two ends of 6 first rolling process TA15 strips obtained in the step one by adopting a laser welding method, and carrying out grinding and polishing treatment on the welding seams to obtain 1 first rolling process TA15 welding strip;

step three, carrying out alkali pickling on the first rolling process TA15 welding strip obtained in the step two, then carrying out longitudinal shearing and splitting treatment by using a longitudinal shearing and splitting machine to remove burrs and cracks until the width is 530mm, and then carrying out vacuum annealing heat treatment at the temperature of 930 ℃ for 90min, wherein the vacuum degree is not lower than 7 x 10^-3MPa；

Step four, performing second-pass reversible strip rolling on the first-pass TA15 welded strip subjected to vacuum annealing heat treatment in the step three by using a Sendzimir twenty-roller cold rolling mill, wherein the adopted pass processing rate is 7 percent, and obtaining a second-pass TA15 strip with the thickness of 0.75 mm;

step five, cleaning the second rolling process TA15 strip obtained in the step four by using a mixed solution of an ultrasonic cleaning agent and clean water to remove rolling oil and impurities on the surface, rinsing the strip twice by using warm water, performing longitudinal shearing and slitting treatment by using a longitudinal shearing slitting machine to remove burrs and cracks until the width is 520mm, and performing vacuum annealing heat treatment at the temperature of 930 ℃ for 90min at the vacuum degree of not less than 7 x 10^-3MPa；

Sixthly, performing third-rolling reversible strip rolling on the second-rolling-process TA15 strip subjected to the vacuum annealing heat treatment in the fifth step by using a Sendzimir twenty-roller cold rolling mill, wherein the adopted pass processing rate is 9 percent, so as to obtain a third-rolling-process TA15 strip with the thickness of 0.67 mm;

step seven, cleaning the third rolling process TA15 strip obtained in the step six by using a mixed solution of an ultrasonic cleaning agent and clear water to remove rolling oil and impurities on the surface, rinsing the strip twice by using warm water, performing longitudinal shearing and slitting treatment by using a longitudinal shearing and slitting machine to remove burrs and cracks until the width is 515mm, and performing vacuum annealing heat treatment at the temperature of 930 ℃ for 90min at the vacuum degree of not less than 7 multiplied by 10^-3MPa；

Eighthly, performing fourth-rolling reversible strip rolling on the third-rolling TA15 strip subjected to the vacuum annealing heat treatment in the seventeenth step by using a Sendzimir twenty-roller cold rolling mill, wherein the adopted pass processing rate is 9 percent, and obtaining a fourth-rolling TA15 strip with the thickness of 0.5 mm;

the roller system of the Sendzimir twenty-roller cold rolling mill in the fourth step, the sixth step and the eighth step all comprises the following components: the upper idler roller and the lower idler roller are both flat rollers, the upper first middle roller and the lower first middle roller are both convex rollers, and the working roller is a flat roller;

step nine, cleaning the fourth rolling process TA15 strip obtained in the step eight by using a mixed solution of an ultrasonic cleaning agent and clean water to remove rolling oil and impurities on the surface, rinsing the strip twice by using warm water, and then performing longitudinal shearing and slitting treatment by using a longitudinal shearing and slitting machine to remove burrs and cracks until the width is 505 mm;

step ten, annealing the fourth rolling process TA15 strip obtained in the step nine at 880 ℃ by adopting a continuous online heat treatment furnace under the protection of argon with the mass purity of 99.999 percent to obtain a TA15 titanium alloy thin strip with the thickness of 0.5mm and the width of 505 mm.

Fig. 5 is a metallographic photograph of a TA15 titanium alloy thin strip prepared in this example, and it can be seen from fig. 5 that the TA15 titanium alloy thin strip has a uniform structure and fine crystal grains.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.