CN117619928B - Preparation method of TC21 titanium alloy oversized bar - Google Patents
Preparation method of TC21 titanium alloy oversized bar Download PDFInfo
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- CN117619928B CN117619928B CN202311706073.8A CN202311706073A CN117619928B CN 117619928 B CN117619928 B CN 117619928B CN 202311706073 A CN202311706073 A CN 202311706073A CN 117619928 B CN117619928 B CN 117619928B
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- 229910001069 Ti alloy Inorganic materials 0.000 title claims abstract description 40
- 101000686227 Homo sapiens Ras-related protein R-Ras2 Proteins 0.000 title claims abstract description 37
- 102100025003 Ras-related protein R-Ras2 Human genes 0.000 title claims abstract description 37
- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 238000005242 forging Methods 0.000 claims abstract description 105
- 238000010304 firing Methods 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims description 20
- 238000004321 preservation Methods 0.000 claims description 16
- 238000007599 discharging Methods 0.000 claims description 7
- 230000001186 cumulative effect Effects 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims 3
- 238000001816 cooling Methods 0.000 description 18
- 230000009467 reduction Effects 0.000 description 14
- 238000010586 diagram Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 4
- 230000008520 organization Effects 0.000 description 4
- 238000013461 design Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 229910018098 Ni-Si Inorganic materials 0.000 description 1
- 229910018529 Ni—Si Inorganic materials 0.000 description 1
- 230000005856 abnormality Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000265 homogenisation Methods 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000010079 rubber tapping Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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
- B21C37/04—Manufacture of metal sheets, bars, wire, tubes or like semi-manufactured products, not otherwise provided for; Manufacture of tubes of special shape of bars or wire
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/002—Hybrid process, e.g. forging following casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21J—FORGING; HAMMERING; PRESSING METAL; RIVETING; FORGE FURNACES
- B21J5/00—Methods for forging, hammering, or pressing; Special equipment or accessories therefor
- B21J5/06—Methods for forging, hammering, or pressing; Special equipment or accessories therefor for performing particular operations
- B21J5/08—Upsetting
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Abstract
The invention discloses a preparation method of a TC21 titanium alloy oversized bar, which comprises the following steps: step one, cogging and forging 3 times in a beta single-phase area: upsetting and drawing forging are carried out on the first firing time to obtain an intermediate billet cast ingot with a square section; upsetting and drawing forging in a three-dimensional reversing mode are carried out on the 2 nd to 3 rd times to obtain an intermediate billet cast ingot with a square section and a grain size of 3.5mm to 5.5 mm; step two, forging the middle of the alpha+beta two-phase region for 3 times: upsetting the intermediate billet cast ingot at each firing time, then drawing and forging the intermediate billet cast ingot into a blank with a square cross section, and finally continuing drawing and forging the intermediate billet cast ingot into an intermediate blank with an eight-direction cross section; step three, forming and forging 2 times in an alpha+beta two-phase region: the intermediate blank is drawn and forged into a blank with a circular cross section in the 1 st firing time, and the circular blank is rounded into a bar blank with a circular cross section in the 2 nd firing time, and the bar blank meets the requirement of the size. The invention improves the uniformity of bar tissue, and can prepare TC21 titanium alloy oversized bars with tissue, diameter phi 500 mm-phi 600mm and single weight larger than 4 tons, and the performance of which meets the requirements.
Description
Technical Field
The invention belongs to the technical field of nonferrous metal processing technology, and particularly relates to a preparation method of a TC21 titanium alloy oversized bar.
Background
The TC21 titanium alloy is a novel high-strength, high-toughness and high-damage tolerance titanium alloy which is independently researched and developed in China and has independent intellectual property rights, belongs to Ti-Al-Sn-Zr-Mo-Cr-Nb (-Ni-Si) two-phase titanium alloy, has excellent strength, plasticity, fracture toughness and lower crack propagation rate, and is widely applied to the aerospace industry, particularly the field of airplane structural parts, such as key bearing parts of large frames, beams and the like of an airplane.
Nowadays, along with the idea of large-scale and integration of aircraft structural design, a larger specification requirement is put forward on TC21 titanium alloy bars. At present, the maximum use specification phi of TC21 titanium alloy bars is less than or equal to 400mm, the single weight is less than 2 tons, and the development requirements of the aerospace industry cannot be met.
Disclosure of Invention
The invention aims to provide a preparation method of a TC21 titanium alloy oversized bar. The invention improves the uniformity of bar tissue, and can prepare TC21 titanium alloy oversized bars with tissue, diameter phi 500 mm-phi 600mm and single weight larger than 4 tons, and the performance of which meets the requirements.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a preparation method of a TC21 titanium alloy oversized bar comprises the following steps:
Step one, cogging and forging 3 times in a beta single-phase area:
Upsetting and drawing forging are carried out on the TC21 titanium alloy cast ingot at the 1 st firing time to obtain an intermediate billet cast ingot with a square section; upsetting and drawing forging in a three-dimensional reversing mode are carried out on the 2 nd to 3 rd times to obtain an intermediate billet cast ingot with a square section and a grain size of 3.5mm to 5.5 mm;
Step two, forging the middle of the alpha+beta two-phase region for 3 times:
Upsetting and forging the intermediate billet cast ingot at each firing time, drawing and forging the intermediate billet cast ingot to form a square-section billet, and continuing drawing and forging the intermediate billet cast ingot to form an eight-direction section intermediate billet;
step three, forming and forging 2 times in an alpha+beta two-phase region:
The intermediate blank is drawn and forged into a blank with a circular cross section in the 1 st firing time, and the circular blank is rounded into a bar blank with a circular cross section in the 2 nd firing time, and the bar blank meets the requirement of the size.
Preferably, in the first step, the specification of the TC21 titanium alloy cast ingot is phi 690 mm-phi 720mm, and the single weight is more than 5 tons.
Preferably, in the first step, the 1 st heating temperature is Tbeta+ (150-250) DEG C, the heat preservation time is 450-600 min, and the cumulative forging ratio is 5.5-7.5.
Preferably, in the first step, the heating temperature of the 2 nd to the 3 rd fires is Tbeta+ (50-150) DEG C, the heat preservation time is 450-600 min, and the accumulated forging ratio of the two fires is controlled to be 12-14.
Preferably, in the first step, the "three-dimensional reversing" is that the intermediate billet ingot is firstly subjected to upsetting forging along the axial direction and then is subjected to drawing forging along the radial direction every 1 firing.
Preferably, in the second step, the heating temperature is Tbeta- (20-50) DEG C, the heat preservation time is 360-540 min, and the cumulative forging ratio of three fires is 12-18.
Preferably, in the third step, the 1 st heating temperature is Tbeta- (30-60) DEG C, the heat preservation time is 320-450 min, and the round blank with the diameter of phi 530-phi 630mm is drawn and forged after the furnace is taken out.
Preferably, the elongation deformation is controlled to be 30-40%, and the final forging temperature is not lower than 750 ℃.
Preferably, in the third step, the heating temperature of the 2 nd firing time is Tbeta- (40-70) DEG C, the heat preservation time is 300-420 min, the rod blank with the diameter of phi 510-phi 610mm is rounded after being discharged from the furnace, and the rod blank is processed to prepare the TC21 titanium alloy oversized bar with the diameter of phi 500-phi 600mm and the single weight of more than 4 tons.
Preferably, the rounding deformation is controlled to be 5-15%, and the final forging temperature is not lower than 700 ℃.
The invention has the beneficial effects that:
The preparation method is based on the evolution characteristics of a plastic processing structure of the TC21 titanium alloy, adopts a single-phase region cogging forging, two-phase region intermediate forging and forming forging process, combines a three-dimensional reversing and eight-direction forging mode, obviously refines cast columnar grains, effectively improves the forging deformation dead zone, improves the structural uniformity of the bar, and can prepare a TC21 titanium alloy oversized bar with the structure, the performance meeting the requirement, the diameter phi 500 mm-phi 600mm and the single weight being greater than 4 tons. The large-scale and integrated design requirement of the main bearing structural component of the novel aircraft is met.
Drawings
Fig. 1 is a low-power structure diagram of a head section, a middle section and a tail section of a super-large-specification bar with 500mm of TC21 titanium alloy phi prepared in the embodiment 1 of the invention, wherein the diagram a is a low-power structure diagram of the head section of the bar, the diagram b is a low-power structure diagram of the middle section of the bar, and the diagram c is a low-power structure diagram of the tail section of the bar.
FIG. 2 is a 500X high-power organization chart of R/2 positions of head, middle and tail cross sections of a TC21 titanium alloy phi 500mm oversized bar prepared in the embodiment 1, wherein the chart a is high-power organization of R/2 positions of the head cross section of the bar, the chart b is high-power organization of R/2 positions of the middle cross section of the bar, and the chart c is high-power organization of R/2 positions of the tail cross section of the bar.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings and embodiments of the present invention.
The invention provides a preparation method of a TC21 titanium alloy oversized bar, which adopts a single-phase region cogging forging-two-phase region intermediate forging-forming forging process and specifically comprises the following steps:
Step one, cogging and forging 3 times in a beta single-phase area:
The specification of the titanium alloy cast ingot is that the diameter phi 690 mm-phi 720mm, the single weight is larger than 5 tons, the TC21 titanium alloy cast ingot is subjected to upsetting and drawing forging at the 1 st firing, the cast ingot is firstly heated to the temperature of a beta single-phase region and is insulated, and then is subjected to large deformation forging after being discharged from a furnace, so that an intermediate cast ingot with a square section is obtained, and the material cooling mode after forging is air cooling.
The method comprises the steps of carrying out three-dimensional reversing forging mode on the ingot at 2-3 times, heating the ingot to the temperature of a beta single-phase region, preserving heat, discharging, adopting three-dimensional reversing upsetting and drawing forging, and finally obtaining the intermediate billet ingot with square cross section and grain size of 3.5-5.5 mm, wherein the cooling mode of the intermediate billet ingot after each forging time is air cooling.
When the single-phase region cogging forging is performed, the 1 st firing heating temperature is Tbeta+ (150-250) DEG C, the heat preservation time is 450-600 min, upsetting and drawing forging are performed after the tapping, the cumulative forging ratio is 5.5-7.5, the upsetting reduction rate is 40-50 mm/s, the drawing reduction rate is 70-80 mm/s, the feeding amount is 300-400 mm during drawing, and finally the intermediate billet ingot with square section is obtained. The heating temperature of the 2 nd to 3 rd fires is Tbeta+ (50-150) DEG C, the heat preservation time is 450-600 min, and each fire adopts 'three-dimensional reversing' upsetting and drawing forging, namely, each 1-fire intermediate billet ingot casting is firstly subjected to upsetting forging along the axial direction and then is subjected to drawing forging along the radial direction. This forging mode can eliminate deformation "dead zones". The accumulated forging ratio of the two times is controlled to be 12-14, the sufficient refinement and homogenization of beta grains are ensured, the upsetting reduction rate is 40-50 mm/s, the drawing reduction rate is 70-80 mm/s, the feeding amount during drawing is 300-400 mm, and finally the intermediate billet cast ingot with square section is obtained.
Based on the evolution characteristics of a plastic deformation structure of the TC21 titanium alloy, forging heat deformation amount above a transformation point (single-phase area) is reasonably designed, a forging deformation dead zone is eliminated by combining a three-dimensional reversing forging mode, and as-cast beta grains are thinned from 20mm to 40mm to be uniform 3.5mm to 5.5mm.
Step two, forging the middle of the alpha+beta two-phase region for 3 times:
Heating the intermediate billet ingot to the temperature of an alpha+beta two-phase region at each firing time, preserving heat, upsetting and forging after discharging, drawing and forging to form a blank with a square cross section, and finally continuing drawing to form an intermediate blank with an eight-direction cross section, wherein the cooling mode of the material after forging is air cooling.
And during middle forging of the two-phase region, heating temperature is Tbeta- (20-50) DEG C each time, heat preservation time is 360-540 min, upsetting and drawing forging are finished, and then continuous drawing forging is carried out to obtain a middle blank with the section in all directions, and the cumulative forging ratio of three times is 12-18. The upsetting reduction rate is 20-30 mm/s, the drawing reduction rate is 40-60 mm/s, the feeding amount during drawing is 200-300 mm, and the cooling mode of the intermediate blank after each forging is air cooling.
Step three, forming and forging 2 times in an alpha+beta two-phase region:
heating the intermediate blank to the temperature of an alpha+beta two-phase region at the 1 st firing time, preserving heat, drawing out, forging into a blank with a circular cross section, and cooling the forged material in an air cooling mode.
Heating the round blank to the temperature of an alpha and beta two-phase region at the 2 nd firing time, preserving heat, shaping and forging after discharging, and rounding into a rod blank with a round section and a size meeting the requirement, wherein the material cooling mode after forging is air cooling.
During forming forging, the 1 st firing heating temperature is Tbeta- (30-60) DEG C, the heat preservation time is 320-450 min, and after discharging, the round blank with the diameter of phi 530-phi 630mm is drawn and forged. The elongation deformation is controlled to be 30-40%, the final forging temperature is not lower than 750 ℃, and the cooling mode of the round blank after forging is air cooling. The heating temperature of the 2 nd firing time is Tbeta- (40-70) DEG C, the heat preservation time is 300-420 min, shaping forging is carried out after discharging, the rod blank with the diameter of phi 510-phi 610mm is formed by rounding, the rounding deformation is controlled to be 5-15%, and the final forging temperature is not lower than 700 ℃. The cooling mode of the forged bar blank is air cooling.
And (3) machining the bar blank with the diameter of phi 510 mm-phi 610mm to finally prepare the TC21 titanium alloy oversized bar with the diameter of phi 500 mm-phi 600mm and the single weight of more than 4 tons.
The present invention will be described in further detail with reference to specific examples.
Example 1
1) Single-phase region cogging forging 3 times:
the ingot is integrally forged by adopting a blank with the single weight of 5.2 tons and the diameter phi 690mm, and the transformation point of the ingot is 960 ℃.
The 1 st fire cast ingot is directly heated to 1170 ℃ and is preserved for about 450-600 min, upsetting and drawing forging are carried out after the cast ingot is discharged, the total forging ratio of upsetting and drawing forging is controlled to be 5.5-7.5, the upsetting reduction rate is 40-50 mm/s, the drawing reduction rate is 70-80 mm/s, the feeding amount is 300-400 mm during drawing, the square intermediate billet cast ingot with the cross section is obtained, and the intermediate billet cast ingot after forging is air-cooled.
The intermediate billet cast ingot of the 2 nd to 3 rd fires is directly heated to 1100 ℃ and is kept at the temperature for about 450 to 600 minutes, and is subjected to 'three-dimensional reversing' upsetting and drawing forging after being discharged, namely, the intermediate billet cast ingot of each 1 fire is subjected to upsetting forging along the axial direction and then is subjected to drawing forging along the radial direction. The accumulated forging ratio of the two times is controlled to be 12-14, the upsetting reduction rate is 40-50 mm/s, the drawing reduction rate is 70-80 mm/s, the feeding amount during drawing is 300-400 mm, and the intermediate billet ingot with a square section is obtained, and the intermediate billet ingot after each time of forging is air-cooled.
2) Forging the two-phase region intermediate blank for 3 times:
The intermediate billet cast ingot of the 1 st fire time is directly heated to 940 ℃ and is kept for 360-450 min, upsetting, drawing and eight-direction forging are carried out after the ingot is discharged, namely, the intermediate billet cast ingot is subjected to upsetting and drawing forging along the axial direction to obtain an intermediate billet with a square section, and then the intermediate billet with the eight-direction section is continuously drawn and forged along the axial direction. The forging ratio of each firing time is controlled to be 4-6, the upsetting reduction rate is 20-30 mm/s, the drawing reduction rate is 40-60 mm/s, the feeding amount during drawing is 200-300 mm, and the intermediate blank after forging is air-cooled.
The intermediate blank with 2-3 times of fire is directly heated to 930 ℃ and 920 ℃ for heat preservation for 360-450 min, upsetting, drawing and eight-direction forging are carried out after the blank is discharged, and the forging mode is consistent with the 1 st time of fire. The forging ratio of each firing time is controlled to be 4-6, the upsetting reduction rate is 20-30 mm/s, the drawing reduction rate is 40-60 mm/s, the feeding amount during drawing is 200-300 mm, and the intermediate blank is air-cooled after each firing time.
3) Forging for 2 times:
The intermediate blank of the 1 st fire is directly heated to 910 ℃ and kept at the temperature for about 320-450 min, and is drawn out of the furnace and forged into a round blank with the diameter of phi 530 mm. The elongation deformation is controlled to be 30-40%, the elongation depressing speed is 30-40 mm/s, the feeding amount during the elongation is 200-300 mm, and the final forging temperature is not lower than 750 ℃. Air cooling the forged round blank.
The round blank at the 2 nd fire time is directly heated to 900 ℃ and is preserved for about 300-420 min, and is shaped and forged after being discharged from the furnace, and is rounded into a bar blank with the diameter of phi 510mm, the deformation is controlled to be 5-15%, and the final forging temperature is not lower than 700 ℃. Air cooling the forged bar blank.
And (3) machining the bar blank with the diameter phi of 510mm to finally prepare the TC21 titanium alloy oversized bar with the diameter phi of 500mm and the single weight of 4.2 tons. (remark: finished product machine added size is phi 500 mm)
The test pieces with the diameter of 500mm multiplied by 75mm are sawed from the head, middle and tail parts of the ultra-large bar with the diameter of 500mm of the TC21 titanium alloy prepared in the embodiment 1 and subjected to heat treatment, and the high, low-power tissues and the transverse room temperature mechanical properties of the cross sections of the head, middle and tail parts of the bar are detected.
The diameter of the TC21 titanium alloy oversized bar is phi 500mm, the length is about 4700mm, and the single weight is about 4.2 tons. FIG. 1 is a drawing showing the microstructure of the cross section of the head, middle and tail parts of a TC21 titanium alloy phi 500mm oversized bar prepared by the forging method, and the microstructure is uniform and fuzzy and has no metallurgical defects. FIG. 2 shows the high-power structure of R/2 position of the cross section of the head, middle and tail of the ultra-large bar with the diameter of 500mm of TC21 titanium alloy prepared by the forging method, and the high-power structure is composed of an equiaxed and a small amount of short rod-shaped primary alpha phase, and is uniform and free from abnormalities such as overheat structure. The transverse room temperature tensile property detection results of R/2 positions of the cross sections of the head, middle and tail parts of the ultra-large bar with the diameter of 500mm of the TC21 titanium alloy prepared by the forging method are shown in the table 1, and the detection results all meet the requirements of aviation standards, have good uniformity and have a certain margin. To sum up, the TC21 titanium alloy ultra-large bar prepared by the forging method has good tissue, overall consistency of performance and uniformity.
TABLE 1 room temperature tensile Property of TC21 titanium alloy phi 500mm oversized bars
。
Claims (4)
1. The preparation method of the TC21 titanium alloy oversized bar is characterized by comprising the following steps of:
Step one, cogging and forging 3 times in a beta single-phase area:
Upsetting and drawing forging are carried out on the TC21 titanium alloy cast ingot at the 1 st firing time to obtain an intermediate billet cast ingot with a square section; upsetting and drawing forging in a three-dimensional reversing mode are carried out on the 2 nd to 3 rd times to obtain an intermediate billet cast ingot with a square section and a grain size of 3.5mm to 5.5 mm;
The heating temperature of the 1 st fire is Tbeta+ (150-250) DEG C, the heat preservation time is 450-600 min, the accumulated forging ratio is 5.5-7.5, the heating temperature of the 2 nd-3 fire is Tbeta+ (50-150) DEG C, the heat preservation time is 450-600 min, the accumulated forging ratio of the two fires is controlled to be 12-14, and the three-dimensional reversing is that upsetting forging is carried out on each 1-fire intermediate billet ingot in the axial direction firstly, and then the drawing forging is carried out in the radial direction;
Step two, forging the middle of the alpha+beta two-phase region for 3 times:
Upsetting and forging the intermediate billet cast ingot at each firing time, drawing and forging the intermediate billet cast ingot to form a square-section billet, and continuing drawing and forging the intermediate billet cast ingot to form an eight-direction section intermediate billet;
The heating temperature of each fire is Tbeta- (20-50) DEG C, the heat preservation time is 360-540 min, and the cumulative forging ratio of three fires is 12-18;
step three, forming and forging 2 times in an alpha+beta two-phase region:
drawing and forging the intermediate blank into a blank with a circular cross section at the 1 st firing time, and rounding the circular blank into a bar blank with a circular cross section at the 2 nd firing time, wherein the bar blank meets the requirement of the size;
The 1 st heating temperature is Tbeta- (30-60) DEG C, the heat preservation time is 320-450 min, the round blank with the diameter of phi 530-phi 630mm is drawn and forged after discharging, the 2 nd heating temperature is Tbeta- (40-70) DEG C, the heat preservation time is 300-420 min, the round bar blank with the diameter of phi 510-phi 610mm is formed by rounding after discharging, and the bar blank is processed to prepare the TC21 titanium alloy oversized bar with the diameter of phi 500-phi 600mm and the single weight of more than 4 tons.
2. The method for producing a bar of ultra-large size of TC21 titanium alloy according to claim 1, wherein in said step one, the specification of TC21 titanium alloy ingot is Φ690mm to Φ720mm, and the single weight is more than 5 tons.
3. The method for producing a bar of ultra-large size of TC21 titanium alloy according to claim 1, wherein in said third step, the elongation deformation is controlled to 30% to 40% at the first firing time, and the final forging temperature is not lower than 750 ℃.
4. The method for producing a TC21 titanium alloy oversized bar according to claim 1, wherein in said step three, the amount of rounding deformation is controlled to be 5% to 15% at the second firing, and the final forging temperature is not lower than 700 ℃.
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| CN114603074B (en) * | 2022-04-02 | 2023-03-28 | 西部超导材料科技股份有限公司 | Forging method of ultra-high-strength and high-toughness TB18 titanium alloy large-size forging stock |
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|---|---|---|---|---|
| CN103510030A (en) * | 2013-09-23 | 2014-01-15 | 西北有色金属研究院 | Preparation method of TC21 titanium alloy large-specification bar |
| CN106734796A (en) * | 2016-12-14 | 2017-05-31 | 西部超导材料科技股份有限公司 | The engine forging method of high temperature resistant titanium alloy large scale rod bar |
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