CN117772792A - Rolling method of Ti-6242 titanium alloy sheet - Google Patents
Rolling method of Ti-6242 titanium alloy sheet Download PDFInfo
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- CN117772792A CN117772792A CN202311748337.6A CN202311748337A CN117772792A CN 117772792 A CN117772792 A CN 117772792A CN 202311748337 A CN202311748337 A CN 202311748337A CN 117772792 A CN117772792 A CN 117772792A
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- 238000005096 rolling process Methods 0.000 title claims abstract description 238
- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 68
- 238000000034 method Methods 0.000 title claims abstract description 31
- 238000000137 annealing Methods 0.000 claims abstract description 27
- 238000003466 welding Methods 0.000 claims abstract description 26
- 239000011248 coating agent Substances 0.000 claims abstract description 15
- 238000000576 coating method Methods 0.000 claims abstract description 15
- 238000005253 cladding Methods 0.000 claims abstract description 14
- 238000012937 correction Methods 0.000 claims abstract description 10
- 239000003973 paint Substances 0.000 claims abstract description 7
- 229910000831 Steel Inorganic materials 0.000 claims description 41
- 239000010959 steel Substances 0.000 claims description 41
- 238000005098 hot rolling Methods 0.000 claims description 25
- 238000005520 cutting process Methods 0.000 claims description 24
- 238000010438 heat treatment Methods 0.000 claims description 19
- 238000004381 surface treatment Methods 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 9
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims description 5
- 239000003963 antioxidant agent Substances 0.000 claims description 5
- 230000003078 antioxidant effect Effects 0.000 claims description 5
- 238000002955 isolation Methods 0.000 claims description 5
- 229910052719 titanium Inorganic materials 0.000 claims description 5
- 239000010936 titanium Substances 0.000 claims description 5
- 239000004576 sand Substances 0.000 claims description 4
- 238000009966 trimming Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 238000005422 blasting Methods 0.000 claims description 3
- 230000001680 brushing effect Effects 0.000 claims description 3
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000013329 compounding Methods 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000007493 shaping process Methods 0.000 claims description 3
- 229910045601 alloy Inorganic materials 0.000 abstract description 8
- 239000000956 alloy Substances 0.000 abstract description 8
- 238000005336 cracking Methods 0.000 abstract description 6
- 238000005242 forging Methods 0.000 abstract description 6
- 230000009466 transformation Effects 0.000 abstract description 4
- 230000003064 anti-oxidating effect Effects 0.000 abstract description 2
- 239000000047 product Substances 0.000 description 10
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000011265 semifinished product Substances 0.000 description 5
- 230000007547 defect Effects 0.000 description 4
- 238000005498 polishing Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000003513 alkali Substances 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 238000005485 electric heating Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000013067 intermediate product Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000005554 pickling Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000005275 alloying Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
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Abstract
The invention provides a rolling method of a Ti-6242 titanium alloy sheet, which comprises the following steps: 1. coating high-temperature antioxidation paint on the surface of the forging plate blank and four sides of the forging plate blank; 2. rolling above the cogging transformation point, welding and rolling a single sheet and two sheets below the transformation point of 2-3 times in the middle, and finally cladding a rolling route; 3. the direction of the rolling process is changed after twice blanking for cross rolling; 4. and (3) carrying out double annealing, creep correction and surface sanding treatment on the finished product to obtain the Ti-6242 titanium alloy sheet with the thickness of 0.5-4 mm. The invention effectively prevents the surface and edge cracking phenomenon in the rolling process of Ti-6242 alloy, effectively weakens the rolling texture of the finished plate, ensures that the longitudinal and transverse properties of the plate are more uniform, and obtains the thin plate with excellent tissue properties by precisely controlling the rolling temperature, the rolling deformation, the pass deformation and the rolling speed, thereby providing a powerful support for controlling the batch stability of the plate.
Description
Technical Field
The invention belongs to the technical field of titanium alloy sheet preparation, and particularly relates to a rolling method of a Ti-6242 titanium alloy sheet.
Background
Ti-6242 is a near alpha alloy high temperature titanium alloy, the nominal alloy component is Ti-6Al-2Sn-4Zr-2Mo-0.1Si, the alloy has higher room temperature, high temperature strength, higher high temperature creep property and better thermal stability, the main product forms of the alloy are forgings, bars, plates and the like, and the maximum long-term use temperature is 500 ℃, and the alloy is mainly used for manufacturing aeroengine cases, aircraft skins and the like. The research on Ti-6242 titanium alloy forgings and bars is more in China, and the research on the rolling method of Ti-6242 thin plates is less. The near alpha alloy with larger aerospace consumption is TA15, and the conventional rolling method of the sheet is as follows: the process comprises the steps of multi-heating hot rolling, intermediate semi-finished product annealing, multiple cold rolling processes, intermediate semi-finished product annealing, surface alkali pickling, finished product annealing, and finished product surface alkali pickling/water sand treatment. Compared with the Ti-6242 titanium alloy, the alloy has the advantages of higher alloying degree, low content of beta stable elements, poorer process plasticity, larger rolling deformation resistance of the plate, narrower hot working window, incapability of producing the thin plate by a conventional hot rolling and cold rolling mode, extremely easy cracking in the rolling process, low yield and high production cost. Therefore, how to effectively reduce rolling cracking and mass-produce Ti-6242 thin plates with stable and qualified structures is an urgent problem to be solved.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a rolling method of a Ti-6242 titanium alloy sheet. The invention only adopts the hot rolling process during rolling, has short and efficient flow, realizes the whole-flow production of the plate with the thickness of 0.5-4 mm, prevents the obvious cracking phenomenon of the titanium alloy caused by temperature drop in the traditional process, reduces the polishing amount in the later period, saves the cost and reduces the difficulty in the production process.
In order to achieve the technical purpose, the technical scheme adopted by the embodiment of the invention is as follows: a rolling method of a Ti-6242 titanium alloy sheet comprises the following steps:
s1, compounding a layer of pure titanium on the upper surface and the lower surface of a Ti-6242 titanium alloy plate blank, brushing high-temperature-resistant and antioxidant coating on the edges, and heating the Ti-6242 titanium alloy plate blank after the titanium alloy plate blank is completely dried;
step S2, rolling the Ti-6242 titanium alloy plate blank heated in the step S1 for a first fire time to obtain a first semi-finished plate blank;
s3, cutting the first semi-finished plate blank obtained in the step S2 to obtain a plurality of first intermediate plate blanks;
step S4, setting the temperature of the first intermediate plate blank obtained in the step S3 to be T β Performing second hot rolling at the temperature of between 50 and 100 ℃ to obtain a second semi-finished plate blank;
step S5, setting the temperature of the second intermediate plate blank obtained in the step S4 at T β Performing third fire rolling at the temperature of between 50 and 100 ℃ to obtain a third rolling plate blank;
s6, equally blanking the slab with the thickness of 4.0-6.0 mm obtained in the step S5 according to the product size calculation, aligning and welding four corners of each two plates and the middle part of each side of the blanked plate, and obtaining a third blank with the length of each welding seam of 50-100 mm;
step S7, setting the temperature of the third blank obtained in the step S6 at T β Rolling for the fourth time at the temperature of between 50 and 100 ℃ to obtain a fourth plate blank;
s8, trimming and cutting the fourth plate blank obtained in the step S7, and separating two pieces of materials which are assembled and welded together to obtain a thinner fourth intermediate blank with the thickness of 2.0-3.5 mm;
step S9, carrying out surface treatment on the fourth intermediate blank obtained in the step S8, then cutting and preparing a steel plate and a side strip for cladding, stacking 1-6 fourth intermediate blanks with consistent length and width dimensions, coating isolation paint between the stacking contact surfaces, carrying out surrounding sheath welding by using the steel plate and the side strip, and forming exhaust holes on the front steel plate and the rear steel plate to prepare a first stacked rolling bag;
step S10, the first rolling package manufactured in the step S9 is put into a roller-hearth type electric furnace for heating, the first rolling package after the heating treatment is rolled, and the rolling direction is perpendicular to the rolling direction of the fourth intermediate blank; the rolling is completed in 6-13 passes, the pass deformation rate of each pass is 5-18%, the total deformation rate is 50-65%, and the rolling rate is 0.5-2.0 m/s;
and S11, after rolling, carrying out integral primary annealing, and then sequentially carrying out unpacking, secondary annealing, shaping, surface treatment and cutting to a fixed size to obtain a Ti-6242 titanium alloy sheet finished product with the thickness of 0.5-4 mm.
Further, in the step S1, the thickness of the Ti-6242 titanium alloy plate blank is 120-170 mm, the width is 900-1200 mm, and the length is 1000-1500 mm; the heating temperature is T β +(30～50)℃。
Further, in the step S2, the first-pass rolling is unidirectional rolling, the pass deformation rate of the first-pass rolling is 7-21%, the pass times are 10-16, and the rolling rate is 0.8-2 m/S; the thickness of the first semi-finished plate blank is 10-25 mm, and the width of the first semi-finished plate blank is 1000-1500 mm.
Further, in the step S3, the thickness of the first intermediate slab is 10-25 mm, the width is 800-1150 mm, and the length is 1000-1500 mm.
Further, in the step S4, the pass deformation rate of the second hot rolling is 7% -21%, the rolling rate is 1-2.5 m/S, the rolling direction of the second hot rolling is perpendicular to the rolling direction of the first hot rolling in the step S2, the rolling passes are 3-7, the thickness of the second semi-finished slab is 6-15 mm, and the width of the second semi-finished slab is 800-1150 mm.
Further, in the step S5, the pass deformation rate of the third fire rolling is 7% -12%, the rolling speed is 2-3 m/S, the rolling direction of the third fire rolling is the same as the rolling direction and the rolling temperature of the second fire rolling in the step S4, the thickness of the third rolling plate blank is 4.0-10 mm, and the width of the third rolling plate blank is 800-1150 mm.
Further, in the step S7, the pass deformation rate of the fourth fire rolling is 7% -12%, the rolling speed is 2-3 m/S, the rolling direction of the fourth fire rolling is the same as the rolling direction and the rolling temperature of the third fire rolling in the step S5, the thickness of the fourth slab is 4.0-5 mm, and the width of the fourth slab is 800-1150 mm.
Further, in the step S2, the final rolling temperature of the first hot rolling is not lower than 800 ℃, and the total deformation rate of the first hot rolling is 83% -94%;
the final rolling temperature of the second heat in the step S4, the third heat in the step S5 and the fourth heat in the step S7 is not lower than 800 ℃, and the total deformation rate of the second heat rolling is 40% -50%.
Further, in the step S9, the steel plate is a Q235 steel plate with the thickness of 15-20 mm, shot blasting treatment is carried out on the inner surface of the steel plate before welding, and exhaust holes are formed in two ends of cladding rolling.
Further, the primary annealing treatment temperature in the step S11 is 880-910 ℃, and the annealing time is 30-60 min; the secondary annealing treatment temperature is 750-800 ℃, and the annealing time is 15-30 min; the creep correction processing mode is adopted during correction; the surface treatment of the finished plate adopts a water sand treatment mode.
Compared with the prior art, the invention has the following advantages:
1. the invention provides a rolling method of a Ti-6242 sheet, which only adopts a hot rolling process during rolling, has short and efficient flow, realizes the whole-flow production of the sheet with the thickness of 0.5-4 mm, prevents the obvious cracking phenomenon of the titanium alloy caused by temperature drop in the traditional process, reduces the polishing amount in the later stage, saves the cost and reduces the difficulty in the production process.
2. The invention adopts cladding and rolling or two-piece lapping and cladding and rolling technology to prepare the near alpha Ti-6242 high temperature titanium alloy sheet, reduces the requirement on rolling equipment and avoids the cracking defect caused by surface temperature drop in the hot rolling technology process.
3. The invention adopts a cross rolling mode during rolling, effectively weakens the rolling texture of the finished plate and ensures that the longitudinal and transverse properties of the plate are more uniform.
4. The Ti-6242 titanium alloy sheet with the thickness of 0.5-4.0 mm prepared by the invention has the advantages of accurate and controllable thickness and excellent surface quality, and the structure is an equiaxial structure with the average grain size of 3-8 mu m.
Drawings
Fig. 1 is a schematic diagram of the structure of the lap-rolled wrap welding of the present invention.
FIG. 2 is a metallographic structure (200X) of a Ti-6242 titanium alloy plate prepared in example 1 of the invention.
FIG. 3 is a metallographic structure (200X) of a Ti-6242 titanium alloy plate prepared in example 2 of the invention.
Detailed Description
The invention discloses a rolling method of a Ti-6242 titanium alloy sheet, which comprises the following steps: 1. coating high-temperature antioxidation paint on the surface of the forging plate blank and four sides of the forging plate blank; 2. rolling above the cogging transformation point, welding and rolling a single sheet and two sheets below the transformation point of 2-3 times in the middle, and finally cladding a rolling route; 3. the direction of the rolling process is changed after twice blanking for cross rolling; 4. and (3) carrying out double annealing, creep correction and surface sanding treatment on the finished product to obtain the Ti-6242 titanium alloy sheet with the thickness of 0.5-4 mm.
Specifically, the method comprises the following steps:
s1, compounding a layer of pure titanium on the upper surface and the lower surface of a Ti-6242 titanium alloy plate blank, brushing high-temperature-resistant and antioxidant coating on the edge, and heating the Ti-6242 titanium alloy plate blank after the titanium alloy plate blank is completely dried at the temperature of T β +(30～50)℃；
The thickness of the Ti-6242 titanium alloy plate blank is 120-170 mm, the width is 900-1200 mm, and the length is 1000-1500 mm;
step S2, rolling the Ti-6242 titanium alloy plate blank heated in the step S1 for a first fire time to obtain a first semi-finished plate blank;
the first fire rolling is unidirectional rolling, the pass deformation rate of the first fire rolling is 7-21%, the pass times are 10-16, and the rolling rate is 0.8-2 m/s; the thickness of the first semi-finished plate blank is 10-25 mm, and the width is 1000-1500 mm;
s3, cutting the first semi-finished plate blank obtained in the step S2 to obtain a plurality of first intermediate plate blanks, wherein the thickness of the first intermediate plate blanks is 10-25 mm, the width of the first intermediate plate blanks is 800-1150 mm, and the length of the first intermediate plate blanks is 1000-1500 mm;
step S4, setting the temperature of the first intermediate plate blank obtained in the step S3 to be T β Performing second hot rolling at the temperature of between 50 and 100 ℃ to obtain a second semi-finished plate blank;
the pass deformation rate of the second fire rolling is 7% -21%, the rolling rate is 1-2.5 m/S, the rolling direction of the second fire rolling is perpendicular to the rolling direction of the first fire rolling in the step S2, the rolling passes are 3-7, the thickness of the second semi-finished product plate blank is 6-15 mm, and the width is 800-1150 mm;
step S5, setting the temperature of the second intermediate plate blank obtained in the step S4 at T β Performing third fire rolling at the temperature of between 50 and 100 ℃ to obtain a third rolling plate blank;
the pass deformation rate of the third-pass rolling is 7-12%, the rolling rate is 2-3 m/S, the rolling direction of the third-pass rolling is the same as the rolling direction and the rolling temperature of the second-pass rolling in the step S4, the thickness of the third rolling plate blank is 4.0-10 mm, and the width is 800-1150 mm;
s6, equally blanking the slab with the thickness of 4.0-6.0 mm obtained in the step S5 according to the product size calculation, aligning and welding four corners of each two plates and the middle part of each side of the blanked plate, and obtaining a third blank with the length of each welding seam of 50-100 mm;
step S7, setting the temperature of the third blank obtained in the step S6 at T β Rolling for the fourth time at the temperature of between 50 and 100 ℃ to obtain a fourth plate blank;
the pass deformation rate of the fourth fire rolling is 7% -12%, the rolling rate is 2-3 m/S, the rolling direction of the fourth fire rolling is the same as the rolling direction and the rolling temperature of the third fire rolling in the step S5, the thickness of the fourth slab is 4.0-5 mm, and the width is 800-1150 mm;
in the step S2, the final rolling temperature of the first hot rolling is not lower than 800 ℃, and the total deformation rate of the first hot rolling is 83% -94%;
the final rolling temperature of the second heat in the step S4, the third heat in the step S5 and the fourth heat in the step S7 is not lower than 800 ℃, and the total deformation rate of the second heat rolling is 40% -50%.
S8, trimming and cutting the fourth plate blank obtained in the step S7, and separating two pieces of materials which are assembled and welded together to obtain a thinner fourth intermediate blank with the thickness of 2.0-3.5 mm;
step S9, carrying out surface treatment on the fourth intermediate blank obtained in the step S8, then cutting and preparing a steel plate and a side strip for cladding, stacking 1-6 fourth intermediate blanks with consistent length and width dimensions, coating isolation paint between the stacking contact surfaces, carrying out surrounding sheath welding by using the steel plate and the side strip, and forming exhaust holes on the front steel plate and the rear steel plate to prepare a first stacked rolling bag;
the steel plate adopts a Q235 steel plate with the thickness of 15-20 mm, the inner surface of the steel plate is subjected to shot blasting treatment before welding, and exhaust holes are formed in two ends of cladding rolling;
step S10, the first rolling package manufactured in the step S9 is put into a roller-hearth type electric furnace for heating, the first rolling package after the heating treatment is rolled, and the rolling direction is perpendicular to the rolling direction of the fourth intermediate blank; the rolling is completed in 6-13 passes, the pass deformation rate of each pass is 5-18%, the total deformation rate is 50-65%, and the rolling rate is 0.5-2.0 m/s;
and S11, after rolling, carrying out integral primary annealing, and then sequentially carrying out unpacking, secondary annealing, shaping, surface treatment and cutting to a fixed size to obtain a Ti-6242 titanium alloy sheet finished product with the thickness of 0.5-4 mm.
Specifically, the primary annealing treatment temperature in the step S11 is 880-910 ℃, and the annealing time is 30-60 min; the secondary annealing treatment temperature is 750-800 ℃, and the annealing time is 15-30 min; the creep correction processing mode is adopted during correction; the surface treatment of the finished plate adopts a water sand treatment mode.
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
Example 1
A rolling method of a Ti-6242 titanium alloy sheet comprises the following steps:
s1, coating a layer of TA2 pure titanium with the thickness of 0.5mm on the upper surface and the lower surface of a Ti-6242 titanium alloy plate blank with the specification thickness of 150mm, the width of 900mm and the length of 1000mm with high-temperature resistant antioxidant coating TB980 by explosion, drying the titanium alloy plate blank thoroughly, putting the titanium alloy plate blank into an electric heating roller hearth furnace with the temperature of 1040 ℃, and preserving the heat for 3 hours after the furnace temperature returns to 1040 ℃;
step S2, performing first-pass rolling on the Ti-6242 titanium alloy plate blank heated in the step S1, wherein the first-pass rolling is unidirectional rolling, 11 passes are completed in total, and the pass deformation rates of the rolling passes are respectively as follows: 7.0%,10.7%,14.4%,15.9%,16.7%,17.3%,17.7%,21.0%,20.0%,19.9%,19.8%, and a fire deformation rate of 86.8%, the rolling rate of one-fire rolling including a bite speed and a rolling speed, the bite speed being 1m/s, the rolling speed being 2m/s, to obtain a first semi-finished slab, the first semi-finished slab having a thickness of 19.8mm, a width of 1000mm, and a length of 6800mm;
step S3, cutting and blanking the first semi-finished plate blank obtained in the step S2 according to the length of 1140mm after polishing the surface local defect, wherein the blanking length is used as the firing time width to obtain a plurality of first intermediate plate blanks, the thickness of the first intermediate plate blanks is 19.8mm, the width is 1140mm, and the length is 1000mm;
step S4, heating the first intermediate plate blank obtained in the step S3 to 940 ℃ in a roller hearth electric furnace, carrying out heat preservation for 20 minutes after the temperature is returned, and then carrying out second-time rolling on the heated cutting material; the second hot rolling direction is reversed by 90 degrees relative to the first hot rolling direction, namely, the second hot rolling direction is perpendicular to the first hot rolling direction, and is completed in 5 passes, and the pass deformation rate of each pass of rolling is respectively as follows: 19.2%,21%,20%,19.1%,18.8% of the second semi-finished slab, the fire deformation rate being 64.6% and the rolling rate of the second fire rolling being 1.5 m/s; the thickness of the second semi-finished plate blank is 7mm, the width is 1140mm, and the length is 2800mm;
s5, after judging the ruler in the second intermediate plate blank obtained in the step S4, heating to 940 ℃ in a roller-hearth electric furnace, preserving heat for 7 minutes, and then rolling the heated cutting material for a third fire time; the third fire rolling and the second fire rolling have the same direction, the three passes are completed, and the pass deformation rate of each pass of rolling is respectively as follows: 17.1%,13.7%,10%, a heat deformation rate of 35.7%, and a rolling rate of 2.5m/s for third heat rolling to obtain a third rolling plate blank, wherein the thickness of the third rolling plate blank is 4.5mm, the width of the third rolling plate blank is 1140mm, and the length of the third rolling plate blank is 2120mm;
s6, blanking the third rolled plate blank obtained in the step S5, and aligning and welding four corners of each two plates and the middle part of each side of the blanked plate blank, wherein the length of each welding seam is 50-100 mm, so as to obtain a third blank;
step S7, heating the third blank obtained in the step S6 to 940 ℃, preserving heat for 9 minutes, and then rolling the heated cut material for a fourth time; the fourth fire rolling and the third fire rolling have the same direction, the four passes are completed, and the pass deformation rate of each pass of rolling is respectively as follows: 20.0%,19.4%,20.7%,15.0%, a fire deformation rate of 44.4%, a rolling rate of 2.5m/s for fourth fire rolling, and obtaining a fourth slab, wherein the thickness of the fourth slab is 4.0mm, the width of the fourth slab is 1140mm, and the length of the fourth slab is 2100mm;
s8, trimming and cutting the fourth plate blank obtained in the step S7, and separating two pieces of materials which are assembled and welded together to obtain a fourth intermediate blank, wherein the thickness of the fourth intermediate blank is 2.0mm, the width of the fourth intermediate blank is 1100mm, and the length of the fourth intermediate blank is 960mm;
step S9, carrying out surface treatment on the fourth intermediate blank obtained in the step S8, then cutting and preparing steel plates and strakes for cladding, stacking 5 fourth semi-finished product slabs with consistent length and width, coating isolation paint between the stacking contact surfaces, and carrying out surrounding sheath welding on the steel plates and the strakes, wherein as shown in figure 1, an oil press is adopted to compress, spot welding is adopted, submerged arc welding is adopted to carry out four-side surfacing, vent holes are formed in the front and rear steel plates, the length of the vent holes is 20-30 mm, the number of the vent holes is three from the head to the tail, and a first rolling bag with the thickness of 50mm, the width of 1060mm and the length of 1280mm is manufactured; the steel plate for cladding and the edge strip are made of Q235 steel, wherein the thickness of the steel plate is 20mm, the width of the steel plate is 1060mm, the length of the steel plate is 1280mm, the edge strip comprises a transverse edge strip and a longitudinal edge strip, the size of the longitudinal edge strip is 10mm in thickness, the width of the steel plate is 25mm, the length of the steel plate is 1280mm, and the size of the transverse edge strip is 10mm in thickness, the width of the steel plate is 25mm, and the length of the steel plate is 450mm;
step S10, heating the first rolling package obtained in the step S9 to 950 ℃, returning to the temperature, preserving heat for 80 minutes, and then rolling the heated first rolling package, wherein the rolling direction is perpendicular to the rolling direction of the fourth intermediate blank; the method is completed in 7 passes, and the pass deformation rate of each pass of rolling is respectively as follows: 16%,14.3%,16.7%,13.3%,15.4%,18.2%,11.1% and a heat deformation rate of 58.0% and a rolling rate of 1.2m/s;
and (3) after rolling, carrying out integral primary annealing, and sequentially unpacking to obtain a Ti-6242 titanium alloy plate intermediate product with the thickness of 0.8mm, the width of 960mm and the length of 2600mm, and carrying out secondary annealing, shape correction, surface treatment and cutting to length to obtain a Ti-6242 titanium alloy sheet finished product with the specification thickness multiplied by the width multiplied by the length of 0.51mm multiplied by 920mm multiplied by 2400 mm.
Fig. 2 is a metallographic structure diagram (200×) of a Ti-6242 titanium alloy sheet prepared in this example, and it can be seen from fig. 2 that the metallographic structure of the Ti-6242 titanium alloy sheet prepared in this example is uniform and fine equiaxed α grains. Through detection, the Ti-6242 titanium alloy plate prepared by the embodiment has a flat and smooth surface, has high temperature performance at room temperature and 482 ℃ and creep at 540 ℃ as shown in Table 1, and has a larger margin than the standard in performance, so that the Ti-6242 titanium alloy plate has uniform structure, excellent mechanical properties at room temperature and high temperature and good surface quality.
Example 2
A rolling method of a Ti-6242 titanium alloy sheet comprises the following steps:
s1, coating a layer of TA2 pure titanium with the thickness of 0.5mm on the upper surface and the lower surface of a Ti-6242 titanium alloy plate blank with the specification thickness multiplied by the width multiplied by the length multiplied by 150mm multiplied by 900mm multiplied by 1000mm by explosion, coating a high-temperature-resistant antioxidant coating TG-6 on the other four surfaces, drying thoroughly, then placing the dried product into an electric heating roller hearth furnace with the temperature raised to 1040 ℃, and preserving heat for 3 hours after the furnace temperature returns to 1040 ℃;
step S2, performing first-pass rolling on the Ti-6242 titanium alloy plate blank heated in the step S1, wherein the first-pass rolling is one-way rolling, the total 12 passes are completed, and the pass deformation rates of each pass of rolling are respectively as follows: 7.0%,10.7%,14.4%,15.9%,16.7%,17.3%,17.7%,21.0%,20.0%,19.9%,19.8%,12.8% and a fire deformation rate of 88.7%, wherein the rolling rate of the first fire rolling comprises a biting speed and a rolling speed, the biting speed is 1m/s, the rolling speed is 2m/s, and a first semi-finished plate blank is obtained, the thickness of the first semi-finished plate blank is 17.0mm, the width of the first semi-finished plate blank is 1000mm, and the length of the first semi-finished plate blank is 6800mm;
step S3, cutting and blanking the first semi-finished plate blank obtained in the step S2 according to the length 1170mm after polishing the surface local defect, wherein the blanking length is used as the firing time width to obtain a plurality of first intermediate plate blanks, the thickness of the first intermediate plate blanks is 17.0mm, the width is 1170mm, and the length is 1000mm;
step S4, heating the first intermediate plate blank obtained in the step S3 to 940 ℃ in a roller hearth electric furnace, returning to the temperature, preserving heat for 17 minutes, and then performing second-time rolling on the heated cutting material; the second fire rolling direction is perpendicular to the first fire rolling direction, the four passes are completed, and the pass deformation rate of each pass of rolling is respectively as follows: 17.6%,21%,18.2%,11.1%, heat deformation rate of 52.9%, rolling speed of 1.5m/s for second heat rolling to obtain a second semi-finished plate blank, wherein the thickness of the second semi-finished plate blank is 8mm, the width of the second semi-finished plate blank is 1170mm, and the length of the second semi-finished plate blank is 2120mm;
s5, after judging the ruler in the second semi-finished product slab obtained in the step S4, heating to 940 ℃ in a roller-hearth electric furnace, preserving heat for 8 minutes, and then rolling the heated cutting material for a third fire; the third fire rolling and the second fire rolling have the same direction, the total 4 passes are completed, and the pass deformation rate of each pass of rolling is respectively as follows: 18.7%,16.9%,16.6%,12.5%, a fire deformation rate of 50%, a rolling rate of 2.5m/s for third fire rolling, and obtaining a third rolling plate blank, wherein the thickness of the third rolling plate blank is 4.0mm, the width of the third rolling plate blank is 1170mm, and the length of the third rolling plate blank is 2120mm;
s6, blanking the third rolled plate blank obtained in the step S5, and aligning and welding four corners of each two plates and the middle part of each side of the blanked plate blank, wherein the length of each welding seam is 50-100 mm, so as to obtain a third blank;
s7, cutting the third blank obtained in the step S6 through surface treatment, cutting and preparing steel plates and side bars for cladding, stacking 5 third blanks with consistent length and width, coating isolation paint between the stacking contact surfaces, and performing surrounding sheath welding on the steel plates and the side bars to obtain a first stitch rolling package, wherein as shown in FIG. 1, an oil press is adopted to compress, then spot welding is adopted, submerged arc welding is adopted to build up welding on four sides, vent holes are formed in the front and rear steel plates, the length of each vent hole is 20-30 mm, the number of the vent holes is three, and the number of the vent holes is 50mm, the width is 1060mm, and the length is 1280 mm; the steel plate for cladding and the edge strip are made of Q235 steel, wherein the thickness of the steel plate is 20mm, the width of the steel plate is 1060mm, the length of the steel plate is 1310mm, the edge strip comprises a transverse edge strip and a longitudinal edge strip, the size of the longitudinal edge strip is 8mm in thickness, 25mm in width, 1310mm in length, and the size of the longitudinal edge strip is 8mm in thickness, 25mm in width and 450mm in length;
step S8, heating the first rolling package obtained in the step S7 to 950 ℃, returning to the temperature, preserving heat for 80 minutes, and then rolling the heated first rolling package, wherein the rolling direction is perpendicular to the rolling direction of the third rolling plate blank; the method is completed in 7 passes, and the pass deformation rate of each pass of rolling is respectively as follows: 12.5%,14.3%,16.7%,13.3%,15.4%,17.3%,11.9% and a fire deformation rate of 55.0%, and a rolling rate of 1.2m/s;
and (3) after rolling, carrying out integral primary annealing, and sequentially unpacking to obtain a Ti-6242 titanium alloy plate intermediate product with the thickness of 1.78mm, the width of 960mm and the length of 2600mm, and carrying out secondary annealing, shape correction, surface treatment and cutting to length to obtain the Ti-6242 titanium alloy plate with the specification thickness multiplied by the width multiplied by the length of 1.6mm multiplied by 920mm multiplied by 2400 mm.
Fig. 3 is a metallographic structure diagram (200×) of a Ti-6242 titanium alloy sheet prepared in this example, and it can be seen from fig. 3 that the metallographic structure of the Ti-6242 titanium alloy sheet prepared in this example is uniform and fine equiaxed α grains. The Ti-6242 titanium alloy plate prepared in the embodiment has a flat and smooth surface, high temperature performance at room temperature and 482 ℃ and creep deformation at 540 ℃ as shown in Table 1.
TABLE 1 Performance parameters of the Ti-6242 titanium alloy plates produced in example 2
As can be seen from Table 1, the Ti-6242 titanium alloy plate prepared in the embodiment has larger margin than the standard value in performance, which indicates that the Ti-6242 titanium alloy plate has uniform structure, excellent mechanical properties at room temperature and high temperature and good surface quality.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.
Claims (10)
1. The rolling method of the Ti-6242 titanium alloy sheet is characterized by comprising the following steps of:
s1, compounding a layer of pure titanium on the upper surface and the lower surface of a Ti-6242 titanium alloy plate blank, brushing high-temperature-resistant and antioxidant coating on the edges, and heating the Ti-6242 titanium alloy plate blank after the titanium alloy plate blank is completely dried;
step S2, rolling the Ti-6242 titanium alloy plate blank heated in the step S1 for a first fire time to obtain a first semi-finished plate blank;
s3, cutting the first semi-finished plate blank obtained in the step S2 to obtain a plurality of first intermediate plate blanks;
step S4, setting the temperature of the first intermediate plate blank obtained in the step S3 to be T β Performing second hot rolling at the temperature of between 50 and 100 ℃ to obtain a second semi-finished plate blank;
step S5, setting the temperature of the second intermediate plate blank obtained in the step S4 at T β Performing third fire rolling at the temperature of between 50 and 100 ℃ to obtain a third rolling plate blank;
s6, equally blanking the slab with the thickness of 4.0-6.0 mm obtained in the step S5 according to the product size calculation, aligning and welding four corners of each two plates and the middle part of each side of the blanked plate, and obtaining a third blank with the length of each welding seam of 50-100 mm;
step S7, setting the temperature of the third blank obtained in the step S6 at T β Rolling for the fourth time at the temperature of between 50 and 100 ℃ to obtain a fourth plate blank;
s8, trimming and cutting the fourth plate blank obtained in the step S7, and separating two pieces of materials which are assembled and welded together to obtain a thinner fourth intermediate blank with the thickness of 2.0-3.5 mm;
step S9, carrying out surface treatment on the fourth intermediate blank obtained in the step S8, then cutting and preparing a steel plate and a side strip for cladding, stacking 1-6 fourth intermediate blanks with consistent length and width dimensions, coating isolation paint between the stacking contact surfaces, carrying out surrounding sheath welding by using the steel plate and the side strip, and forming exhaust holes on the front steel plate and the rear steel plate to prepare a first stacked rolling bag;
step S10, the first rolling package manufactured in the step S9 is put into a roller-hearth type electric furnace for heating, the first rolling package after the heating treatment is rolled, and the rolling direction is perpendicular to the rolling direction of the fourth intermediate blank; the rolling is completed in 6-13 passes, the pass deformation rate of each pass is 5-18%, the total deformation rate is 50-65%, and the rolling rate is 0.5-2.0 m/s;
and S11, after rolling, carrying out integral primary annealing, and then sequentially carrying out unpacking, secondary annealing, shaping, surface treatment and cutting to a fixed size to obtain a Ti-6242 titanium alloy sheet finished product with the thickness of 0.5-4 mm.
2. The method for rolling a Ti-6242 titanium alloy sheet according to claim 1, wherein the Ti-6242 titanium alloy slab in step S1 has a thickness of 120-170 mm, a width of 900-1200 mm, and a length of 1000-1500 mm; the heating temperature is T β +（30～50）℃。
3. The rolling method of the Ti-6242 titanium alloy sheet according to claim 1, wherein the first-pass rolling in the step S2 is unidirectional rolling, the pass deformation rate of the first-pass rolling is 7-21%, the pass times are 10-16, and the rolling rate is 0.8-2 m/S; the thickness of the first semi-finished plate blank is 10-25 mm, and the width of the first semi-finished plate blank is 1000-1500 mm.
4. The method according to claim 1, wherein the first intermediate slab in step S3 has a thickness of 10 to 25mm, a width of 800 to 1150mm, and a length of 1000 to 1500mm.
5. The rolling method of the Ti-6242 titanium alloy sheet according to claim 1, wherein the pass deformation rate of the second hot rolling in the step S4 is 7% -21%, the rolling rate is 1-2.5 m/S, the rolling direction of the second hot rolling is perpendicular to the rolling direction of the first hot rolling in the step S2, the rolling passes are 3-7, the thickness of the second semi-finished slab is 6-15 mm, and the width is 800-1150 mm.
6. The rolling method of the Ti-6242 titanium alloy sheet according to claim 1, wherein the pass deformation rate of the third-pass rolling in the step S5 is 7% -12%, the rolling rate is 2-3 m/S, the rolling direction of the third-pass rolling is the same as the rolling direction and the rolling temperature of the second-pass rolling in the step S4, the thickness of the third rolling slab is 4.0-10 mm, and the width is 800-1150 mm.
7. The rolling method of the Ti-6242 titanium alloy sheet according to claim 1, wherein the pass deformation rate of the fourth hot rolling in the step S7 is 7% -12%, the rolling rate is 2-3 m/S, the rolling direction of the fourth hot rolling is the same as the rolling direction and the rolling temperature of the third hot rolling in the step S5, the thickness of the fourth slab is 4.0-5 mm, and the width is 800-1150 mm.
8. The rolling method of the Ti-6242 titanium alloy sheet according to claim 1, wherein the final rolling temperature of the first train rolling in step S2 is not lower than 800 ℃, and the total deformation rate of the first train rolling is 83% to 94%;
the final rolling temperature of the second heat in the step S4, the third heat in the step S5 and the fourth heat in the step S7 is not lower than 800 ℃, and the total deformation rate of the second heat rolling is 40% -50%.
9. The rolling method of the Ti-6242 titanium alloy sheet according to claim 1, wherein in the step S9, the steel plate is a Q235 steel plate with the thickness of 15-20 mm, the inner surface of the steel plate is subjected to shot blasting treatment before welding, and exhaust holes are formed at two ends of cladding rolling.
10. The rolling method of the Ti-6242 titanium alloy sheet according to claim 1, wherein the primary annealing treatment temperature in the step S11 is 880-910 ℃ and the annealing time is 30-60 min; the secondary annealing treatment temperature is 750-800 ℃, and the annealing time is 15-30 min; the creep correction processing mode is adopted during correction; the surface treatment of the finished plate adopts a water sand treatment mode.
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