CN109013738A - A kind of preparation method of used at ultra-low temperature TA7ELI titanium alloy plate - Google Patents
A kind of preparation method of used at ultra-low temperature TA7ELI titanium alloy plate Download PDFInfo
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- CN109013738A CN109013738A CN201810798756.3A CN201810798756A CN109013738A CN 109013738 A CN109013738 A CN 109013738A CN 201810798756 A CN201810798756 A CN 201810798756A CN 109013738 A CN109013738 A CN 109013738A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21C—MANUFACTURE OF METAL SHEETS, WIRE, RODS, TUBES OR PROFILES, OTHERWISE THAN BY ROLLING; AUXILIARY OPERATIONS USED IN CONNECTION WITH METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL
- B21C37/00—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape
- B21C37/02—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of sheets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21B—ROLLING OF METAL
- B21B1/00—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations
- B21B1/38—Metal-rolling methods or mills for making semi-finished products of solid or profiled cross-section; Sequence of operations in milling trains; Layout of rolling-mill plant, e.g. grouping of stands; Succession of passes or of sectional pass alternations for rolling sheets of limited length, e.g. folded sheets, superimposed sheets, pack rolling
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Abstract
The invention discloses a kind of preparation method of used at ultra-low temperature TA7ELI titanium alloy plate, this method comprises: one, TA7ELI titanium alloy slab is subjected to first time heating；Two, the TA7ELI titanium alloy slab after heating for the first time is rolled into obtain the first semi-finished product slab；Three, the first semi-finished product slab successively polished, pickling and cut to obtain the second semi-finished product slab；Four, the second semi-finished product slab second is carried out to heat；Five, the second semi-finished product slab rolling after heating for the second time is obtained into the second semi-finished product slab；Six, it will be aligned after the heat preservation of the second semi-finished product slab, obtain TA7ELI titanium alloy plate after being air-cooled to room temperature.For the present invention using the method for high-temperature heating treatment and commutation rolling, the twinning deformation for accounting for leading deformation status under ultralow temperature for plate provides biggish deformation space, and promotes the homogenization of slab tissue, has obtained used at ultra-low temperature TA7ELI titanium alloy plate.
Description
Technical field
The invention belongs to titanium alloy material preparation technical fields, and in particular to a kind of used at ultra-low temperature TA7ELI titanium alloy plate
Preparation method.
Background technique
TA7ELI titanium alloy (ingredient Ti-5Al-2.5Sn) belongs to single-phase alpha titanium alloy, have preferable corrosion resistance and
Higher specific strength when the alloy interstitial element is extremely low, also has good toughness and comprehensive performance in ultralow temperature (- 253 DEG C),
It is excellent used at ultra-low temperature alloy, can be used as the engineering material used under the conditions of liquid hydrogen, is used widely in space industry.
Currently, domestic TA7ELI titanium alloy is cake material and bar in the main profile that ultralow temperature field is applied, and make
Relevant standard is determined.But the production cost of forging is much higher than the cost of rolling, and subsequent machining cost is also higher than plate, difficulty
Greatly, therefore it is less complicated for some shapes, load or the lesser workpiece of impact are born, processing can be carried out using plate and is obtained
?.TA7ELI titanium alloy plate is required to be not less than 690MPa, elongation percentage in 20 DEG C of tensile strength under room temperature in industry
Not less than 10%, the tensile strength under -253 DEG C of condition of ultralow temperature is not less than 1220MPa, and elongation percentage is not less than 9%.And
The working plasticity of TA7ELI titanium alloy is poor, easy to crack, and pressure processing allows deflection smaller, therefore nonuniform organization easily occurs
Problem, especially for the limited medium-thick plate of deflection.In addition, the tissue heredity of titanium alloy is stronger, and the alloy is again
Single-phase alloy, the texture (orientation) generated in process are affected to the cryogenic property of subsequent finished product plate, it is domestic still
Untapped used at ultra-low temperature TA7ELI titanium alloy plate out.In order to accelerate the development of China's space industry, it is necessary to study ultralow temperature
With the production method of TA7ELI titanium alloy plate, this will play important meaning to the manufacturing cost for reducing the certain workpiece of space industry
Justice.
Summary of the invention
Technical problem to be solved by the present invention lies in view of the above shortcomings of the prior art, provide a kind of used at ultra-low temperature
The preparation method of TA7ELI titanium alloy plate.This method uses high-temperature heating treatment and rolling direction to TA7ELI titanium alloy slab
The method of mutually perpendicular commutation rolling, accounted under ultralow temperature for plate the leading twinning deformation for deforming status provide it is biggish
Deformation space, and the texture generated in rolling process is eliminated, the homogenization of slab tissue is promoted, ultralow temperature has been obtained
With TA7ELI titanium alloy plate, solves the problems, such as the production of used at ultra-low temperature TA7ELI titanium alloy plate.
In order to solve the above technical problems, the technical solution adopted by the present invention is that: a kind of used at ultra-low temperature TA7ELI titanium alloy sheet
The preparation method of material, which is characterized in that method includes the following steps:
Step 1: by the TA7ELI titanium alloy slab being prepared by Explosion composite TA7ELI titanium alloy transformation temperature with
3.5h~4.5h is kept the temperature under conditions of upper 30 DEG C~80 DEG C, then 10 DEG C~50 DEG C of the item below TA7ELI titanium alloy transformation temperature
0.5h~1h is kept the temperature under part, completes to heat for the first time；The TA7ELI titanium alloy slab with a thickness of 150mm~220mm,
Width is 800mm~1200mm, and length is 1200mm~1500mm；
It is rolled Step 2: the TA7ELI titanium alloy slab in step 1 after heating for the first time is carried out the first fire
System, obtains the first semi-finished product slab；The first fire time rolling is unidirection rolling, and the total deformation rate of the first fire time rolling is 60%
~70%, finishing temperature is not less than 800 DEG C；The first semi-finished product slab with a thickness of 50mm~80mm, width be 800mm~
1200mm；
Step 3: the first semi-finished product slab obtained in step 2 successively to be carried out to polishing and pickling, then cut,
Obtain the second semi-finished product slab；The second semi-finished product slab with a thickness of 50mm~80mm, width is 800mm~1200mm,
Length is 1050mm~1500mm；
Step 4: by the second semi-finished product slab obtained in step 3 10 DEG C~50 below TA7ELI titanium alloy transformation temperature
80min~120min is kept the temperature under conditions of DEG C, is completed second and is heated；
Step 5: the second semi-finished product slab in step 4 after heating for the second time is subjected to the second fire time rolling,
Obtain the second semi-finished product slab；The second semi-finished product slab with a thickness of 25mm~35mm, width is 1050mm~1500mm,
Length is 1600mm~2400mm；The direction of the second fire time rolling is vertical with the direction of the first fire time rolling in step 2；
The total deformation rate of the second fire time rolling is 50%~60%；
Step 6: the second semi-finished product slab obtained in step 5 is kept the temperature under conditions of 750 DEG C~850 DEG C 1h~
Then 1.5h is aligned, obtain TA7ELI titanium alloy plate after being air-cooled to room temperature；The TA7ELI titanium alloy plate is -253
DEG C condition of ultralow temperature under tensile strength be not less than 1350MPa, elongation percentage be not less than 9%.TA7ELI titanium alloy slab is existed
It more than TA7ELI titanium alloy transformation temperature heats, makes slab microstructure homogenization and coarsening, and uniform coarse tissue is that slab exists
The twinning deformation that leading deformation status is accounted under ultralow temperature provides biggish deformation space, promotes the progress of twinning deformation, from
And be conducive to deformation of the TA7ELI titanium alloy slab under ultralow temperature；And the mutually perpendicular two fire time commutation of rolling direction is used to roll
System, reduces the uneven deformation on TA7ELI titanium alloy slab transverse and longitudinal direction, and then reduce slab inner tissue structure in transverse and longitudinal
Difference on direction eliminates the texture generated in rolling process, promotes the homogenization of slab tissue.
The preparation method of above-mentioned a kind of used at ultra-low temperature TA7ELI titanium alloy plate, which is characterized in that described in step 2
The pass deformation rate of first fire time rolling is 5%~15%, and passage is 10~12 times, and the rolling rate of the first fire time rolling is
3m/s~5m/s.In the first fire time operation of rolling, by the pass deformation rate of reasonable controlled rolling, passage and rate is rolled,
Promote the crystal grain refinement and homogenization of TA7ELI titanium alloy plate, obtains uniformly excellent grain structure.
The preparation method of above-mentioned a kind of used at ultra-low temperature TA7ELI titanium alloy plate, which is characterized in that described in step 5
The pass deformation rate of second fire time rolling is 7%~17%, and passage is 6~8 times, and the rolling rate of the second fire time rolling is 3m/s
~5m/s.Using the rolling parameter close with the first fire time rolling in the second fire time operation of rolling, TA7ELI is further ensured
The uniformity of grain structure in titanium alloy plate, make finally obtained TA7ELI titanium alloy plate be provided simultaneously with higher intensity and
Good plasticity, and strong plasticity matching degree is higher.
Compared with the prior art, the present invention has the following advantages:
1, the present invention carries out at high-temperature heating TA7ELI titanium alloy slab in TA7ELI titanium alloy transformation temperature temperatures above
Reason makes slab microstructure homogenization and coarsening, and uniform coarse tissue is that slab accounts for leading deformation status under ultralow temperature
Twinning deformation provides biggish deformation space, promotes the progress of twinning deformation, to improve TA7ELI titanium alloy slab
Ultralow temperature deformation performance, then by rolling direction it is mutually perpendicular two fire time commutation rolling modes further obviate rolling
The texture generated in process further promotes the homogenization of slab tissue, improves the super of TA7ELI titanium alloy plate
Low-temperature deformation performance, to obtain used at ultra-low temperature TA7ELI titanium alloy plate.
2, the present invention is become by rolling temperature, total deformation rate, the passage of control the first fire time rolling and the second fire time rolling
The technological parameters such as shape amount, rolling direction, rolling pass obtain uniformly excellent grain structure, keep TA7ELI titanium alloy plate same
When have higher intensity and good plasticity, and strong plasticity matching degree is higher.
3, tensile strength of the TA7ELI titanium alloy plate that is prepared of the present invention under -253 DEG C of condition of ultralow temperature is not
Less than 1350MPa, elongation percentage is not less than 9%, fully meets industry requirement, solve used at ultra-low temperature TA7ELI titanium alloy plate
Production problem reduces the manufacturing cost of the certain workpiece of space industry, meets the demand of China's space industry development.
Below by embodiment, technical scheme of the present invention will be described in further detail.
Specific embodiment
Embodiment 1
The present embodiment the following steps are included:
Step 1: by the TA7ELI titanium alloy slab being prepared by Explosion composite TA7ELI titanium alloy transformation temperature with
Keep the temperature 3.5h under conditions of upper 30 DEG C, then 50 DEG C below TA7ELI titanium alloy transformation temperature under conditions of keep the temperature 0.5h, complete
Heat for the first time；The TA7ELI titanium alloy slab with a thickness of 150mm, width 1200mm, length 1500mm；
It is rolled Step 2: the TA7ELI titanium alloy slab in step 1 after heating for the first time is carried out the first fire
System, obtains the first semi-finished product slab；The first fire time rolling is unidirection rolling, and the passage of the first fire time rolling is 10 times, respectively
The deformation rate of passage is respectively as follows: 6.7%, 9.3%, 12.6%, 12.6%, 13.4%, 11.9%, 12.2%, 10.8%,
8.6%, 5.7%, the total deformation rate of the first fire time rolling is 67%, and finishing temperature is 800 DEG C, the rolling speed of the first fire time rolling
Rate is 3m/s；The first semi-finished product slab with a thickness of 50mm, width 1200mm；
Step 3: the first semi-finished product slab obtained in step 2 successively to be carried out to polishing and pickling, then cut,
Obtain the second semi-finished product slab；The second semi-finished product slab with a thickness of 50mm, width 1200mm, length 1050mm；
Step 4: by the second semi-finished product slab obtained in step 3 below TA7ELI titanium alloy transformation temperature 50 DEG C of item
80min is kept the temperature under part, is completed second and is heated；
Step 5: the second semi-finished product slab in step 4 after heating for the second time is subjected to the second fire time rolling,
Obtain the second semi-finished product slab；The direction of the second fire time rolling is vertical with the direction of the first fire time rolling in step 2；Institute
The passage for stating the second fire time rolling is 6 times, and the deformation rate of each passage is respectively as follows: 10%, 13%, 13%, 12%, 10%, 7%,
Total deformation rate is 50%, and the rolling rate of the second fire time rolling is 3m/s；The second semi-finished product slab with a thickness of 25mm, it is wide
Degree is 1050mm, length 2400mm；
Step 6: the second semi-finished product slab obtained in step 5 is kept the temperature 1h under conditions of 750 DEG C, then rectified
Directly, TA7ELI titanium alloy plate is obtained after being air-cooled to room temperature.
Through detecting, the crystallite dimension for the TA7ELI titanium alloy plate that the present embodiment is prepared is 40 μm~50 μm,
TA7ELI titanium alloy plate is 800MPa, yield strength 755MPa, elongation percentage in 20 DEG C of tensile strength under room temperature
It is 16.5%, the tensile strength under -253 DEG C of condition of ultralow temperature is 1461MPa, and elongation percentage 9% meets industry and wants
It asks；The ultrasonic examination TA7ELI titanium alloy plate that the present embodiment is prepared as the result is shown meets GB/T5193-2007 titanium
And A1 grade standard requirement in titanic alloy machining product defect detection on ultrasonic basis, illustrate TA7ELI titanium alloy sheet manufactured in the present embodiment
The microscopic structure of material is uniform, and cryogenic mechanics performance and room-temperature mechanical property are excellent.
Embodiment 2
The present embodiment the following steps are included:
Step 1: by the TA7ELI titanium alloy slab being prepared by Explosion composite TA7ELI titanium alloy transformation temperature with
Keep the temperature 4h under conditions of upper 50 DEG C, then 30 DEG C below TA7ELI titanium alloy transformation temperature under conditions of keep the temperature 0.8h, complete the
Primary heating processing；The TA7ELI titanium alloy slab with a thickness of 170mm, width 1000mm, length 1300mm；
It is rolled Step 2: the TA7ELI titanium alloy slab in step 1 after heating for the first time is carried out the first fire
System, obtains the first semi-finished product slab；The first fire time rolling is unidirection rolling, and the passage of the first fire time rolling is 11 times, respectively
The deformation rate of passage is respectively as follows: 5%, 6%, 13%, 11%, 9%, 8%, 8%, 8%, 7%, 6%, 5%, the first fire time rolling
Total deformation rate be 60%, finishing temperature be 830 DEG C, first fire time rolling rolling rate be 4m/s；First semi-finished product
Slab with a thickness of 68mm, width 1000mm；
Step 3: the first semi-finished product slab obtained in step 2 successively to be carried out to polishing and pickling, then cut,
Obtain the second semi-finished product slab；The second semi-finished product slab with a thickness of 68mm, width 1000mm, length 1200mm；
Step 4: by the second semi-finished product slab obtained in step 3 below TA7ELI titanium alloy transformation temperature 30 DEG C of item
100min is kept the temperature under part, is completed second and is heated；
Step 5: the second semi-finished product slab in step 4 after heating for the second time is subjected to the second fire time rolling,
Obtain the second semi-finished product slab；The direction of the second fire time rolling is vertical with the direction of the first fire time rolling in step 2；Institute
The passage for stating the second fire time rolling is 7 times, and the deformation rate of each passage is respectively as follows: 17%, 12%, 11%, 11%, 10%, 8%,
8%, the rolling rate of total deformation rate 56%, the second fire time rolling is 5m/s；The second semi-finished product slab with a thickness of
30mm, width 1200mm, length 2266mm；
Step 6: the second semi-finished product slab obtained in step 5 is kept the temperature 1.2h under conditions of 800 DEG C, then carry out
Aligning, obtains TA7ELI titanium alloy plate after being air-cooled to room temperature.
Through detecting, the crystallite dimension for the TA7ELI titanium alloy plate that the present embodiment is prepared is 45 μm~55 μm,
TA7ELI titanium alloy plate is 790MPa, yield strength 738MPa, elongation percentage in 20 DEG C of tensile strength under room temperature
It is 16%, the tensile strength under -253 DEG C of condition of ultralow temperature is 1430MPa, and elongation percentage 14% meets industry requirement；
The ultrasonic examination TA7ELI titanium alloy plate that the present embodiment is prepared as the result is shown meets GB/T5193-2007 titanium and titanium
The requirement of A1 grade standard, illustrates TA7ELI titanium alloy plate manufactured in the present embodiment in worked alloy product defect detection on ultrasonic basis
Microscopic structure is uniform, and cryogenic mechanics performance and room-temperature mechanical property are excellent.
Embodiment 3
The present embodiment the following steps are included:
Step 1: by the TA7ELI titanium alloy slab being prepared by Explosion composite TA7ELI titanium alloy transformation temperature with
Keep the temperature 4.5h under conditions of upper 80 DEG C, then 10 DEG C below TA7ELI titanium alloy transformation temperature under conditions of keep the temperature 1h, complete the
Primary heating processing；The TA7ELI titanium alloy slab with a thickness of 220mm, width 800mm, length 1200mm；
It is rolled Step 2: the TA7ELI titanium alloy slab in step 1 after heating for the first time is carried out the first fire
System, obtains the first semi-finished product slab；The first fire time rolling is unidirection rolling, and the passage of the first fire time rolling is 11 times, respectively
The deformation rate of passage is respectively as follows: 7%, 10%, 15%, 11%, 11%, 10%, 7%, 7%, 7%, 6%, 6%, the first fire
The total deformation rate of rolling is 64%, and finishing temperature is 830 DEG C, and the rolling rate of the first fire time rolling is 5m/s；Described the first half
Finished product slab with a thickness of 80m, width 800mm；
Step 3: the first semi-finished product slab obtained in step 2 successively to be carried out to polishing and pickling, then cut,
Obtain the second semi-finished product slab；The second semi-finished product slab with a thickness of 80mm, width 800mm, length 1500mm；
Step 4: by the second semi-finished product slab obtained in step 3 below TA7ELI titanium alloy transformation temperature 10 DEG C of item
120min is kept the temperature under part, is completed second and is heated；
Step 5: the second semi-finished product slab in step 4 after heating for the second time is subjected to the second fire time rolling,
Obtain the second semi-finished product slab；The direction of the second fire time rolling is vertical with the direction of the first fire time rolling in step 2；Institute
The passage for stating the second fire time rolling is 8 times, and the deformation rate of each passage is respectively as follows: 14%, 13%, 12%, 9%, 8%, 8%,
7%, 7%, the rolling rate of total deformation rate 56%, the second fire time rolling is 5m/s；The thickness of the second semi-finished product slab
For 35mm, width 1500mm, length 1828mm；
Step 6: the second semi-finished product slab obtained in step 5 is kept the temperature 1.5h under conditions of 850 DEG C, then carry out
Aligning, obtains TA7ELI titanium alloy plate after being air-cooled to room temperature.
Through detecting, the crystallite dimension for the TA7ELI titanium alloy plate that the present embodiment is prepared is 40 μm~50 μm, 20
DEG C tensile strength under room temperature be 805MPa, yield strength 763MPa, elongation percentage 17% is ultralow at -253 DEG C
Tensile strength under the conditions of temperature is 1350MPa, and elongation percentage 17% meets industry requirement；Ultrasonic examination as the result is shown this
The TA7ELI titanium alloy plate that embodiment is prepared meets the spy of GB/T5193-2007 titanium and its alloy work product ultrasonic wave
Hurt A1 grade standard requirement in method, illustrates that the microscopic structure of TA7ELI titanium alloy plate manufactured in the present embodiment is uniform, low temperature power
It learns performance and room-temperature mechanical property is excellent.
Embodiment 4
The present embodiment the following steps are included:
Step 1: by the TA7ELI titanium alloy slab being prepared by Explosion composite TA7ELI titanium alloy transformation temperature with
Keep the temperature 4.5h under conditions of upper 40 DEG C, then 30 DEG C below TA7ELI titanium alloy transformation temperature under conditions of keep the temperature 0.6h, complete
Heat for the first time；The TA7ELI titanium alloy slab with a thickness of 200mm, width 1000mm, length 1200mm；
It is rolled Step 2: the TA7ELI titanium alloy slab in step 1 after heating for the first time is carried out the first fire
System, obtains the first semi-finished product slab；The first fire time rolling is unidirection rolling, and the passage of the first fire time rolling is 11 times, respectively
The deformation rate of passage is respectively as follows: 8%, 11%, 15%, 13%, 12%, 12%, 11%, 8%, 8%, 8%, 8%, the first fire
The total deformation rate of rolling is 70%, and finishing temperature is 840 DEG C, and the rolling rate of the first fire time rolling is 5m/s；Described the first half
Finished product slab with a thickness of 60mm, width 1000mm；
Step 3: the first semi-finished product slab obtained in step 2 successively to be carried out to polishing and pickling, then cut,
Obtain the second semi-finished product slab；The second semi-finished product slab with a thickness of 60mm, width 1000mm, length 1200mm；
Step 4: by the second semi-finished product slab obtained in step 3 below TA7ELI titanium alloy transformation temperature 30 DEG C of item
120min is kept the temperature under part, is completed second and is heated；
Step 5: the second semi-finished product slab in step 4 after heating for the second time is subjected to the second fire time rolling,
Obtain the second semi-finished product slab；The direction of the second fire time rolling is vertical with the direction of the first fire time rolling in step 2；Institute
The passage for stating the second fire time rolling is 6 times, and the deformation rate of each passage is respectively as follows: 17%, 16%, 12%, 11%, 9%, 7%, always
Deformation rate is 56%, and the rolling rate of the second fire time rolling is 4m/s；The second semi-finished product slab with a thickness of 28mm, width
For 1200mm, length 2142mm；
Step 6: the second semi-finished product slab obtained in step 5 is kept the temperature 1.2h under conditions of 820 DEG C, then carry out
Aligning, obtains TA7ELI titanium alloy plate after being air-cooled to room temperature.
Through detecting, the crystallite dimension for the TA7ELI titanium alloy plate that the present embodiment is prepared is 45 μm~55 μm, 20
DEG C tensile strength under room temperature be 798MPa, yield strength 756MPa, elongation percentage 16.5% is super at -253 DEG C
Tensile strength under cryogenic conditions is 1412MPa, and elongation percentage 15% meets industry requirement；Ultrasonic examination is as the result is shown
The TA7ELI titanium alloy plate that the present embodiment is prepared meets GB/T5193-2007 titanium and its alloy work product ultrasonic wave
The requirement of A1 grade standard, illustrates that the microscopic structure of TA7ELI titanium alloy plate manufactured in the present embodiment is uniform, low temperature in method of detection
Mechanical property and room-temperature mechanical property are excellent.
Embodiment 5
The present embodiment the following steps are included:
Step 1: by the TA7ELI titanium alloy slab being prepared by Explosion composite TA7ELI titanium alloy transformation temperature with
Keep the temperature 3.8h under conditions of upper 30 DEG C, then 30 DEG C below TA7ELI titanium alloy transformation temperature under conditions of keep the temperature 0.6h, complete
Heat for the first time；The TA7ELI titanium alloy slab with a thickness of 180mm, width 900mm, length 1200mm；
It is rolled Step 2: the TA7ELI titanium alloy slab in step 1 after heating for the first time is carried out the first fire
System, obtains the first semi-finished product slab；The first fire time rolling is unidirection rolling, and the passage of the first fire time rolling is 10 times, respectively
The deformation rate of passage is respectively as follows: 8%, 11%, 14%, 12%, 12%, 11%, 10%, 9%, 8%, 5%, the first fire time rolling
Total deformation rate be 65%, finishing temperature be 840 DEG C, first fire time rolling rolling rate be 5m/s；First semi-finished product
Slab with a thickness of 62.5mm, width 900mm；
Step 3: the first semi-finished product slab obtained in step 2 successively to be carried out to polishing and pickling, then cut,
Obtain the second semi-finished product slab；The second semi-finished product slab with a thickness of 62.5mm, width 900mm, length 1200mm；
Step 4: by the second semi-finished product slab obtained in step 3 below TA7ELI titanium alloy transformation temperature 30 DEG C of item
120min is kept the temperature under part, is completed second and is heated；
Step 5: the second semi-finished product slab in step 4 after heating for the second time is subjected to the second fire time rolling,
Obtain the second semi-finished product slab；The direction of the second fire time rolling is vertical with the direction of the first fire time rolling in step 2；Institute
The passage for stating the second fire time rolling is 7 times, and the deformation rate of each passage is respectively as follows: 16%, 15%, 15%, 13%, 10%, 9%,
7%, the rolling rate of total deformation rate 60%, the second fire time rolling is 5m/s；The second semi-finished product slab with a thickness of
25mm, width 1200mm, length 2250mm；
Step 6: the second semi-finished product slab obtained in step 5 is kept the temperature 1.2h under conditions of 800 DEG C, then carry out
Aligning, obtains TA7ELI titanium alloy plate after being air-cooled to room temperature.
Through detecting, the crystallite dimension for the TA7ELI titanium alloy plate that the present embodiment is prepared is 40 μm~50 μm, 20
DEG C tensile strength under room temperature be 795MPa, yield strength 752MPa, elongation percentage 16% is ultralow at -253 DEG C
Tensile strength under the conditions of temperature is 1423MPa, and elongation percentage 13% meets industry requirement；Ultrasonic examination as the result is shown this
The TA7ELI titanium alloy plate that embodiment is prepared meets the spy of GB/T5193-2007 titanium and its alloy work product ultrasonic wave
Hurt A1 grade standard requirement in method, illustrates that the microscopic structure of TA7ELI titanium alloy plate manufactured in the present embodiment is uniform, low temperature power
It learns performance and room-temperature mechanical property is excellent.
Embodiment 6
The present embodiment the following steps are included:
Step 1: by the TA7ELI titanium alloy slab being prepared by Explosion composite TA7ELI titanium alloy transformation temperature with
Keep the temperature 4h under conditions of upper 30 DEG C, then 40 DEG C below TA7ELI titanium alloy transformation temperature under conditions of keep the temperature 0.8h, complete the
Primary heating processing；The TA7ELI titanium alloy slab with a thickness of 200mm, width 800mm, length 1250mm；
It is rolled Step 2: the TA7ELI titanium alloy slab in step 1 after heating for the first time is carried out the first fire
System, obtains the first semi-finished product slab；The first fire time rolling is unidirection rolling, and the passage of the first fire time rolling is 12 times, respectively
The deformation rate of passage is respectively as follows: 8%, 10%, 12%, 12%, 10%, 9%, 9%, 7%, 7%, 6%, 5%, 5%, the first fire
The total deformation rate of secondary rolling is 65%, and finishing temperature is 820 DEG C, and the rolling rate of the first fire time rolling is 5m/s；Described first
Semi-finished product slab with a thickness of 70mm, width 800mm；
Step 3: the first semi-finished product slab obtained in step 2 successively to be carried out to polishing and pickling, then cut,
Obtain the second semi-finished product slab；The second semi-finished product slab with a thickness of 70mm, width 800mm, length 1100mm；
Step 4: by the second semi-finished product slab obtained in step 3 below TA7ELI titanium alloy transformation temperature 40 DEG C of item
100min is kept the temperature under part, is completed second and is heated；
Step 5: the second semi-finished product slab in step 4 after heating for the second time is subjected to the second fire time rolling,
Obtain the second semi-finished product slab；The direction of the second fire time rolling is vertical with the direction of the first fire time rolling in step 2；Institute
The passage for stating the second fire time rolling is 6 times, and the deformation rate of each passage is respectively as follows: 14%, 13%, 13%, 11%, 7%, 7%, always
Deformation rate is 50%, and the rolling rate of the second fire time rolling is 5m/s；The second semi-finished product slab with a thickness of 35mm, width
For 1100mm, length 1600mm；
Step 6: the second semi-finished product slab obtained in step 5 is kept the temperature 1.3h under conditions of 830 DEG C, then carry out
Aligning, obtains TA7ELI titanium alloy plate after being air-cooled to room temperature.
Through detecting, the crystallite dimension for the TA7ELI titanium alloy plate that the present embodiment is prepared is 45 μm~55 μm, 20
DEG C tensile strength under room temperature be 788MPa, yield strength 739MPa, elongation percentage 18% is ultralow at -253 DEG C
Tensile strength under the conditions of temperature is 1416MPa, and elongation percentage 14% meets industry requirement；Ultrasonic examination as the result is shown this
The TA7ELI titanium alloy plate that embodiment is prepared meets the spy of GB/T5193-2007 titanium and its alloy work product ultrasonic wave
Hurt A1 grade standard requirement in method, illustrates that the microscopic structure of TA7ELI titanium alloy plate manufactured in the present embodiment is uniform, low temperature power
It learns performance and room-temperature mechanical property is excellent.
The above is only presently preferred embodiments of the present invention, is not intended to limit the invention in any way.It is all according to invention skill
Art any simple modification, change and equivalence change substantially to the above embodiments, still fall within technical solution of the present invention
Protection scope in.
Claims (3)
1. a kind of preparation method of used at ultra-low temperature TA7ELI titanium alloy plate, which is characterized in that method includes the following steps:
Step 1: by the TA7ELI titanium alloy slab being prepared by Explosion composite 30 more than TA7ELI titanium alloy transformation temperature
DEG C~80 DEG C under conditions of keep the temperature 3.5h~4.5h, then below TA7ELI titanium alloy transformation temperature under conditions of 10 DEG C~50 DEG C
0.5h~1h is kept the temperature, completes to heat for the first time；The TA7ELI titanium alloy slab with a thickness of 150mm~220mm, width
For 800mm~1200mm, length is 1200mm~1500mm；
Step 2: the TA7ELI titanium alloy slab in step 1 after heating for the first time is carried out the first fire time rolling, obtain
To the first semi-finished product slab；It is described first fire time rolling be unidirection rolling, first fire time rolling total deformation rate be 60%~
70%, finishing temperature is not less than 800 DEG C；The first semi-finished product slab with a thickness of 50mm~80mm, width be 800mm~
1200mm；
Step 3: the first semi-finished product slab obtained in step 2 successively to be carried out to polishing and pickling, is then cut, obtained
Second semi-finished product slab；The second semi-finished product slab with a thickness of 50mm~80mm, width is 800mm~1200mm, length
For 1050mm~1500mm；
Step 4: by the second semi-finished product slab obtained in step 3 10 DEG C~50 DEG C below TA7ELI titanium alloy transformation temperature
Under the conditions of keep the temperature 80min~120min, complete second and heat；
Step 5: the second semi-finished product slab in step 4 after heating for the second time is carried out the second fire time rolling, obtain
Second semi-finished product slab；The second semi-finished product slab with a thickness of 25mm~35mm, width is 1050mm~1500mm, length
For 1600mm~2400mm；The direction of the second fire time rolling is vertical with the direction of the first fire time rolling in step 2；It is described
The total deformation rate of second fire time rolling is 50%~60%；
Step 6: the second semi-finished product slab obtained in step 5 is kept the temperature into 1h~1.5h under conditions of 750 DEG C~850 DEG C,
Then it is aligned, obtains TA7ELI titanium alloy plate after being air-cooled to room temperature；The TA7ELI titanium alloy plate is at -253 DEG C
Tensile strength under condition of ultralow temperature is not less than 1350MPa, and elongation percentage is not less than 9%.
2. a kind of preparation method of used at ultra-low temperature TA7ELI titanium alloy plate according to claim 1, which is characterized in that step
The pass deformation rate of first fire time rolling is 5%~15% described in rapid two, and passage is 10~12 times, and the first fire time rolling is rolled
Rate processed is 3m/s~5m/s.
3. a kind of preparation method of used at ultra-low temperature TA7ELI titanium alloy plate according to claim 1, which is characterized in that step
The pass deformation rate of second fire time rolling is 7%~17% described in rapid five, and passage is 6~8 times, the rolling of the second fire time rolling
Rate is 3m/s~5m/s.
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