CN113172115A - Preparation method of TC6 titanium alloy large-size bar - Google Patents
Preparation method of TC6 titanium alloy large-size bar Download PDFInfo
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- CN113172115A CN113172115A CN202110442291.XA CN202110442291A CN113172115A CN 113172115 A CN113172115 A CN 113172115A CN 202110442291 A CN202110442291 A CN 202110442291A CN 113172115 A CN113172115 A CN 113172115A
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- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
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Abstract
The invention discloses a preparation method of a TC6 titanium alloy large-size bar, which comprises the following steps: firstly, a titanium alloy ingot is pulled out, blanked and forged; secondly, cutting and blanking, and then carrying out first drawing and rolling forging; thirdly, cutting and blanking, and then carrying out secondary drawing and rolling forging; and fourthly, carrying out solution heat treatment and aging heat treatment to obtain the TC6 titanium alloy large-specification bar with the cross section diameter of 100-210 mm and the length of 2000-4000 mm. According to the invention, the coarse as-cast structure in the cast ingot is crushed through one-fire square drawing and cogging forging, the fire frequency of forging is reduced, the strip structure is effectively crushed through one-fire drawing and rounding forging above the phase transition temperature and two-to-three-fire drawing and rounding forging below the phase transition temperature, the defects of low processing and preparation efficiency and long flow path of the conventional large-size titanium alloy are solved, and the forging fire frequency in the processing of the large-size titanium alloy is effectively reduced.
Description
Technical Field
The invention belongs to the technical field of titanium alloy material processing, and particularly relates to a preparation method of a TC6 titanium alloy large-size bar.
Background
The TC6 titanium alloy is a martensite alpha-beta two-phase titanium alloy with good comprehensive performance, the nominal composition of the titanium alloy is Ti-6Al-2.5Mo-1.5Cr-0.5Fe-0.3Si, and the titanium alloy contains alpha stable element Al, isomorphous beta stable element Mo and eutectoid beta stable elements Cr, Fe and Si. The TC6 titanium alloy has higher room temperature strength and good heat strength performance below 450 ℃. The alloy also has excellent hot working process performance, small deformation resistance and high plasticity. The TC6 alloy is mainly used for manufacturing parts such as compressor disks, blades and the like of aeroengines, and can also be used as a medium-strength alloy for manufacturing bearing structural parts such as bulkheads, joints and the like of airplanes and fasteners for different purposes. The produced semi-finished products mainly comprise bars, forgings, die forgings and the like.
Different types and specifications of bars and forgings are prepared by TC6 titanium alloy in China, and the requirements of bearing structural parts and fasteners of certain types of aircrafts in China can be met. However, with the continuous development of the aviation and aerospace industries in China, the demand for TC6 titanium alloy large-specification processing materials is increasingly urgent. The large-size bar has large size and poor blank forging permeability, and needs multi-fire and multi-direction repeated upsetting and drawing to ensure the structural uniformity of the bar, so that the preparation difficulty of the large-size TC6 bar is higher, and in order to solve the structural uniformity problem of the large-size TC6 titanium alloy processed bar, a method for forging after multi-fire upsetting is carried out by combining a phase transformation point and a phase transformation point at present is adopted to ensure that the structure and the performance of the finished TC6 product processed bar meet the requirements. The method has the advantages of multiple forging fire times, long preparation process and large fire grinding amount, so the production efficiency and the yield are lower. In order to solve the preparation problem of the high-quality TC6 titanium alloy large-specification processing material and meet the special development requirements of the aerospace industry, a new preparation method of the TC6 titanium alloy large-specification bar is urgently needed to be developed.
Disclosure of Invention
The technical problem to be solved by the present invention is to provide a method for preparing a TC6 titanium alloy large-sized bar, aiming at the defects of the prior art. According to the method, the TC6 titanium alloy ingot is subjected to square drawing and cogging forging for one fire, a coarse as-cast structure in the TC6 titanium alloy ingot is crushed, the fire frequency of subsequent forging of the TC6 titanium alloy ingot is reduced, one-fire drawing and rounding forging is performed above the phase transition temperature and two-to-three-fire drawing and rounding forging is performed below the phase transition temperature, a long strip structure is effectively crushed, the structure is further refined, a TC6 titanium alloy bar with the cross section diameter of 100-210 mm and the length of 2000-4000 mm is prepared, the defects of low processing and preparation efficiency and long flow path of conventional large-size titanium alloy are overcome, and the forging fire frequency in large-size titanium alloy processing is effectively reduced.
In order to solve the technical problems, the invention adopts the technical scheme that: a preparation method of a TC6 titanium alloy large-size bar is characterized by comprising the following steps:
step one, carrying out one-time hot drawing, cogging and forging on a TC6 titanium alloy ingot to obtain a primary square billet;
step two, cutting and blanking the primary square billet obtained in the step one, and then carrying out primary drawing and rolling forging on the cut and blanked primary square billet for one fire time under the condition that the initial forging temperature is (Tbeta +30) DEG C to (Tbeta +50) DEG C to obtain an intermediate billet; the T beta is the beta phase transition temperature of the TC6 titanium alloy, and the unit of the T beta is;
thirdly, cutting and blanking the intermediate blank in the second step, and then carrying out second-third-fire second-time drawing and rolling forging on the cut and blanked intermediate blank at the initial forging temperature of (Tbeta-30) DEG C to (Tbeta-50) DEG C to obtain a finished bar;
step four, sequentially carrying out solid solution heat treatment and aging heat treatment on the finished bar in the step three to obtain a TC6 titanium alloy large-size bar; the large-size bar is a cylindrical bar with the cross section diameter of 100-210 mm and the length of 2000-4000 mm; the conditions of the solution heat treatment are as follows: keeping the temperature for 1 to 3 hours under the condition that the temperature is between (T beta-10) DEG C and (T beta-20) DEG C, wherein the aging heat treatment condition is as follows: keeping the temperature for 2 to 6 hours at the temperature of between 500 and 650 ℃.
Because the invention needs to prepare large-size bar materials, the larger the large-size materials, the more the need of upsetting forging with multiple fire times, so as to obtain even and fine microstructures, the invention provides larger deformation by carrying out one-fire square cogging forging on TC6 titanium alloy ingots, crushing coarse as-cast structures in TC6 titanium alloy ingots, reducing the fire times of subsequent forging of TC6 titanium alloy ingots, improving the production efficiency, because the TC6 titanium alloy has two allotropic isomers, is beta phase of a body-centered cubic lattice structure when being higher than phase transition temperature T beta, is alpha phase of a close-packed hexagonal lattice structure when being lower than the phase transition temperature T beta, is limited in the number of slip systems in close-packed hexagonal lattices, is difficult in plastic deformation, is completely converted into beta phase of the body-centered cubic lattice structure when the temperature exceeds T beta, the slip coefficient is increased, the forgeability is greatly improved, therefore, the drawing and rounding forging is carried out at the temperature of 30-50 ℃ above the phase transition temperature for further refining the structure, the structure becomes thick due to overhigh temperature, the blank is seriously cracked due to overlow temperature, the drawing and rounding forging has better forging penetration, the deformation can permeate into the center and is matched with large deformation amount, the strip structure can be effectively crushed, the drawing and rounding forging is carried out at the temperature of 30-50 ℃ below the phase transition temperature for two to three times with fire for further uniformly refining the structure, the structure becomes thick due to overhigh temperature, and the blank is seriously cracked due to overlow temperature;
the invention improves the mechanical property of the TC6 titanium alloy large-specification bar through solution heat treatment and aging heat treatment, the TC6 titanium alloy solution heat treatment is required to be carried out at the upper part of a two-phase area in a phase diagram and at a position close to a phase transformation point so as to ensure complete beta transformation, but can not exceed the phase transformation point, once the temperature exceeds the phase transformation point or the holding time is too long, beta crystal grains grow up, a lamella is rapidly separated from the matrix, the lamellar structure is avoided under the general condition of titanium alloy, the phase transition temperature can be exceeded when the solid solution temperature is too high, the ideal solid solution heat treatment effect can not be achieved when the solid solution temperature is too low, the temperature of aging heat treatment is selected to be in a lower temperature range, precipitated alpha crystal grains can grow too coarse when the aging temperature is too high and the heat preservation time is too short, the precipitated alpha crystal grains can be insufficient when the aging temperature is too low and the heat preservation time is too short, and a mixed crystal structure is formed. Therefore, the invention carries out solution heat treatment by keeping the temperature below the phase transition temperature for 1 h-3 h at 10-20 ℃, and carries out aging heat treatment by keeping the temperature at 500-650 ℃ for 2 h-6 h, thereby improving the plasticity and toughness of the TC6 large-specification titanium alloy bar and ensuring that the TC6 large-specification titanium alloy bar has the advantages of good tissue uniformity and good strong plasticity matching.
The preparation method of the TC6 titanium alloy large-size bar is characterized in that in the step one, the TC6 titanium alloy ingot is a cylindrical ingot with the cross section diameter of 540-720 mm. The invention facilitates the subsequent processing by controlling the size and the shape of the TC6 titanium alloy ingot.
The preparation method of the TC6 titanium alloy large-size bar is characterized in that in the first step, the primary square billet is a square billet with the side length of 300-500 mm. According to the invention, by controlling the size of the primary square billet, a larger deformation is provided, a coarse as-cast structure in the TC6 titanium alloy ingot is crushed, the fire frequency of subsequent forging of the TC6 titanium alloy ingot is reduced, and the production efficiency is improved.
The preparation method of the TC6 titanium alloy large-size bar is characterized in that the initial forging temperature in the drawing and cogging forging in the step one is 1000-1150 ℃, and the forging ratio is 1.8-2.4. According to the invention, the full deformation of the TC6 titanium alloy ingot can be ensured by controlling the initial forging temperature and the forging ratio, the coarse as-cast structure in the TC6 titanium alloy ingot is crushed, the fire frequency of the subsequent forging of the TC6 titanium alloy ingot is reduced, the production efficiency is improved, and the TC6 titanium alloy ingot can be prevented from being cracked seriously.
The preparation method of the TC6 titanium alloy large-size bar is characterized in that the forging ratio of the first drawing and rounding forging in the step two is 2.0-2.6. According to the invention, by controlling the forging ratio, the pores in the primary square billet are pressed, and the primary square billet is drawn out and rounded, so that the longitudinal and transverse mechanical properties of the intermediate billet are improved.
The preparation method of the TC6 titanium alloy large-size bar is characterized in that in the third step, the drawing is carried out by adopting a V-shaped anvil, and the forging ratio of the second drawing, rounding and forging is 2.1-3.3. According to the invention, the transverse tensile stress can be reduced to 0 by adopting V-shaped anvil drawing and rounding forging, the forging penetration is best, meanwhile, the hard deformation dead zone is smaller, the recrystallization structure is uniform and fine isometric structure by controlling the forging ratio and pressing with large deformation, and the mechanical property of the finished bar is improved.
The preparation method of the TC6 titanium alloy large-size bar is characterized in that the reduction rate in the square drawing cogging forging in the step one, the first drawing rounding forging in the step two and the second drawing rounding forging in the step three is 15-40%. The invention prevents the defects of uneven finished bar structure caused by the fact that the blank structure cannot be broken due to too small reduction ratio and the defects of too large surface cracks of the blank and even incapability of subsequent forging caused by too large reduction ratio by controlling the reduction ratio.
The preparation method of the TC6 titanium alloy large-size bar is characterized in that the surface grinding treatment is carried out after the first drawing and rounding forging in the second step and the second drawing and rounding forging in the third step. According to the invention, the surface grinding treatment is carried out after forging, because the surface temperature of the TC6 titanium alloy is reduced quickly in the forging process of the TC6 titanium alloy, cracks can appear on the surface of the TC6 titanium alloy, and if the cracks on the surface of the blank cannot be ground completely before the subsequent hot working procedure, the cracks can continue to expand in the subsequent hot working procedure and expand towards the center of the blank, and the whole blank can be seriously scrapped.
The preparation method of the TC6 titanium alloy large-size bar is characterized in that slitting and blanking in the second step and the third step are performed by 2-3 equal-division sawing. The invention facilitates the subsequent treatment by slitting and blanking, and improves the production efficiency.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the TC6 titanium alloy ingot is subjected to one-fire square drawing cogging forging to crush a coarse as-cast structure in the TC6 titanium alloy ingot, so that a larger deformation is provided, the fire frequency of subsequent forging of the TC6 titanium alloy ingot is reduced, the production efficiency is improved, one-fire drawing rounding forging is performed above the phase transition temperature, the forging permeability is better, the deformation can penetrate to the center and is matched with a large deformation amount, a long strip structure can be effectively crushed, the structure is further refined, two-to-three-fire drawing rounding forging is performed below the phase transition temperature, the structure is further uniformly refined, the defects of low processing preparation efficiency and long flow path of the conventional large-size titanium alloy are overcome, and the drawing forging is performed from the beginning of the ingot casting by setting a reasonable reduction ratio, so that the forging fire frequency is effectively reduced.
2. The TC6 titanium alloy bar prepared by the invention is a bar with the diameter of 100 mm-210 mm and the length of 2000 mm-4000 mm, has good organization uniformity, fine crystal grains and good strong plasticity matching, all properties can meet the requirements of standards and tasks, can be used for manufacturing parts such as blades of aircraft engines, can also be used as a medium-strength alloy for manufacturing bearing structural members such as bulkheads, joints and the like of airplanes and fasteners with different purposes, and meets the development requirements of the aerospace industry and the aviation industry
3. The invention improves the plasticity and toughness of the TC6 titanium alloy large-specification bar through solution heat treatment and aging heat treatment, and ensures that the TC6 titanium alloy large-specification bar has the advantages of good structure uniformity and good strong plasticity matching.
4. The invention has good performability, high yield and excellent product quality and is suitable for large-scale industrial production.
The technical solution of the present invention is further described in detail by the accompanying drawings and examples.
Drawings
FIG. 1 is a high magnification organization chart of a TC6 large-sized bar made of titanium alloy according to example 1 of the present invention.
FIG. 2 is a high magnification organization chart of a TC6 large-sized bar made of titanium alloy according to example 2 of the present invention.
FIG. 3 is a high magnification organization chart of a TC6 large-sized bar made of titanium alloy according to example 3 of the present invention.
Detailed Description
Example 1
The embodiment comprises the following steps:
step one, carrying out one-time hot drawing, cogging and forging on a TC6 titanium alloy ingot to obtain a primary square billet; the TC6 titanium alloy ingot is a cylindrical ingot with a cross section diameter of 690mm, the cross section of the primary square billet is a square with a side length of 500mm, the initial forging temperature in the drawing and cogging forging is 1150 ℃, the forging ratio is 2.4, the material-to-width ratio is 1.2, and the reduction ratio is 15%;
step two, cutting and blanking the primary square billet obtained in the step one, and then carrying out primary drawing and rolling forging on the cut and blanked primary square billet for one fire time under the condition that the initial forging temperature is (Tbeta +50) DEG C to obtain an intermediate blank; the T beta is the beta phase transition temperature of the TC6 titanium alloy, and the unit of the T beta is; the forging ratio of the first drawing and rounding forging is 2.6, the material width ratio is 1.2, the reduction rate is 15%, and the surface grinding treatment is carried out after the first drawing and rounding forging; the intermediate blank is a cylindrical blank with the cross section diameter of 350 mm; the slitting and blanking is to perform 2-equal sawing on the primary square billet;
thirdly, cutting and blanking the intermediate blank in the second step, and then carrying out second-time drawing and rolling forging on the cut and blanked intermediate blank at the initial forging temperature of (Tbeta-30) DEG C for two times to obtain a finished bar; the drawing is carried out by adopting a V-shaped anvil, the forging ratio of the secondary drawing and rounding forging is 2.7, the material width ratio is 1.2, the reduction rate is 15 percent, and the surface grinding treatment is carried out after the secondary drawing and rounding forging; the slitting and blanking is to perform 2-equal-slitting and sawing on the intermediate blank;
step four, sequentially carrying out solid solution heat treatment and aging heat treatment on the finished bar in the step three to obtain a TC6 titanium alloy large-specification bar, wherein the large-specification bar is a cylindrical bar with the cross section diameter of 210mm and the length of 4000 mm; the conditions of the solution heat treatment are as follows: keeping the temperature for 2h under the condition that the temperature is (T beta-15) DEG C, wherein the aging heat treatment condition is as follows: keeping the temperature for 3h at 550 ℃.
Fig. 1 is a high-magnification organization chart of a large-sized TC6 titanium alloy bar prepared in this example, and as can be seen from fig. 1, the TC6 titanium alloy bar prepared in this example has a uniform structure.
Through detection, the R of the TC6 titanium alloy large-specification bar prepared by the embodimentmIs 1083MPa, Rp0.21064MPa, A18.5%, Z47%, KCUIs 43.7J/cm2The comprehensive mechanical property meets the technical requirement, and the flaw detection level and the like of the prepared TC6 titanium alloy large-specification bar are far higher than the technical index requirement.
Example 2
The embodiment comprises the following steps:
step one, carrying out one-time hot drawing, cogging and forging on a TC6 titanium alloy ingot to obtain a primary square billet; the TC6 titanium alloy ingot is a cylindrical ingot with the cross section diameter of 720mm, the cross section of the primary square billet is a square with the side length of 410mm, the initial forging temperature in the drawing and cogging forging is 1100 ℃, the forging ratio is 1.8, the material width ratio is 0.8, and the reduction ratio is 40%;
step two, cutting and blanking the primary square billet obtained in the step one, and then carrying out primary drawing and rolling forging on the cut and blanked primary square billet for one fire time under the condition that the initial forging temperature is (Tbeta +40) DEG C to obtain an intermediate blank; the T beta is the beta phase transition temperature of the TC6 titanium alloy, and the unit of the T beta is; the forging ratio of the first drawing and rounding forging is 2.0, the material width ratio is 0.8, the reduction rate is 40%, and the surface grinding treatment is carried out after the forging; the middle blank is a cylindrical blank with the cross section diameter of 327 mm; the slitting and blanking is to perform 2-equal sawing on the primary square billet;
thirdly, cutting and blanking the intermediate blank in the second step, and then carrying out second-time drawing and rolling forging on the cut and blanked intermediate blank at the initial forging temperature of (Tbeta-40) DEG C for two times to obtain a finished bar; the drawing is carried out by adopting a V-shaped anvil, the forging ratio of the secondary drawing and rounding forging is 2.1, the material width ratio is 0.8, the reduction rate is 40 percent, and the surface grinding treatment is carried out after the secondary drawing and rounding forging; the slitting and blanking is to perform 3-equal slitting and sawing on the intermediate blank;
step four, sequentially carrying out solid solution heat treatment and aging heat treatment on the finished bar in the step three to obtain a TC6 titanium alloy large-specification bar, wherein the large-specification bar is a cylindrical bar with the cross section diameter of 140mm and the length of 2000 mm; the conditions of the solution heat treatment are as follows: keeping the temperature for 3h at the temperature of (T beta-10) DEG C, wherein the aging heat treatment conditions are as follows: keeping the temperature at 500 ℃ for 6 h.
Fig. 2 is a high power structure diagram of a large-sized TC6 titanium alloy bar prepared in this embodiment, and as can be seen from fig. 2, the large-sized TC6 titanium alloy bar prepared in this embodiment has a uniform structure.
Through detection, the R of the TC6 titanium alloy large-specification bar prepared by the embodimentmIs 1036MPa, Rp0.2990MPa of A18.5%, Z53%, KCUIs 46J/cm2The comprehensive mechanical property meets the technical requirement, and the flaw detection level and the like of the prepared TC6 titanium alloy large-specification bar are far higher than the technical index requirement.
Example 3
The embodiment comprises the following steps:
step one, carrying out one-time hot drawing, cogging and forging on a TC6 titanium alloy ingot to obtain a primary square billet; the TC6 titanium alloy ingot is a cylindrical ingot with the cross section diameter of 540mm, the cross section of the primary square billet is a square with the side length of 300mm, the initial forging temperature in the drawing and cogging forging is 1000 ℃, the forging ratio is 2, the material width ratio is 1, and the reduction ratio is 20%;
step two, cutting and blanking the primary square billet obtained in the step one, and then carrying out primary drawing and rolling forging on the cut and blanked primary square billet for one fire time under the condition that the initial forging temperature is (Tbeta +30) DEG C to obtain an intermediate blank; the T beta is the beta phase transition temperature of the TC6 titanium alloy, and the unit of the T beta is; the forging ratio of the first drawing and rounding forging is 2.2, the material width ratio is 1, the reduction rate is 20%, and the surface grinding treatment is carried out after the first drawing and rounding forging; the middle blank is a cylindrical blank with the cross section diameter of 257 mm; the slitting and blanking is to perform 3-equal sawing on the primary square billet;
thirdly, cutting and blanking the intermediate blank in the second step, and then carrying out secondary drawing and rolling forging on the cut and blanked intermediate blank for three times at the initial forging temperature of (Tbeta-50) DEG C to obtain a finished bar; the drawing is carried out by adopting a V-shaped anvil, the forging ratio of the second drawing and rounding forging is 3.3, the material width ratio is 1, the reduction rate is 20%, and the surface grinding treatment is carried out after the second drawing and rounding forging; the slitting and blanking is to perform 2-equal-slitting and sawing on the intermediate blank;
step four, sequentially carrying out solid solution heat treatment and aging heat treatment on the finished bar in the step three to obtain a TC6 titanium alloy large-specification bar, wherein the large-specification bar is a cylindrical bar with the cross section diameter of 100mm and the length of 3700 mm; the conditions of the solution heat treatment are as follows: keeping the temperature for 1h at the temperature of (T beta-20) DEG C, wherein the aging heat treatment conditions are as follows: keeping the temperature for 2h at the temperature of 650 ℃.
Fig. 3 is a high power structure diagram of a large-sized TC6 titanium alloy bar prepared in this embodiment, and as can be seen from fig. 3, the large-sized TC6 titanium alloy bar prepared in this embodiment has a uniform structure.
Through detection, the R of the TC6 titanium alloy large-specification bar prepared by the embodimentmIs 1025MPa, Rp0.2967MPa, 23% of A, 48% of Z and KCUIs 50J/cm2The comprehensive mechanical property meets the technical requirement, and the flaw detection level and the like of the prepared TC6 titanium alloy large-specification bar are far higher than the technical index requirement.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way. Any simple modification, change and equivalent changes of the above embodiments according to the technical essence of the invention are still within the protection scope of the technical solution of the invention.
Claims (9)
1. A preparation method of a TC6 titanium alloy large-size bar is characterized by comprising the following steps:
step one, carrying out one-time hot drawing, cogging and forging on a TC6 titanium alloy ingot to obtain a primary square billet;
step two, cutting and blanking the primary square billet obtained in the step one, and then carrying out primary drawing and rolling forging on the cut and blanked primary square billet for one fire time under the condition that the initial forging temperature is (Tbeta +30) DEG C to (Tbeta +50) DEG C to obtain an intermediate billet; the T beta is the beta phase transition temperature of the TC6 titanium alloy, and the unit of the T beta is;
thirdly, cutting and blanking the intermediate blank in the second step, and then carrying out second-third-fire second-time drawing and rolling forging on the cut and blanked intermediate blank at the initial forging temperature of (Tbeta-30) DEG C to (Tbeta-50) DEG C to obtain a finished bar;
step four, sequentially carrying out solid solution heat treatment and aging heat treatment on the finished bar in the step three to obtain a TC6 titanium alloy large-size bar; the large-size bar is a cylindrical bar with the cross section diameter of 100-210 mm and the length of 2000-4000 mm; the conditions of the solution heat treatment are as follows: keeping the temperature for 1 to 3 hours under the condition that the temperature is between (T beta-10) DEG C and (T beta-20) DEG C, wherein the aging heat treatment condition is as follows: keeping the temperature for 2 to 6 hours at the temperature of between 500 and 650 ℃.
2. The method for preparing the TC6 titanium alloy large-size bar material as claimed in the first step, wherein the TC6 titanium alloy ingot in the first step is a cylindrical ingot with the cross section diameter of 540-720 mm.
3. The method of claim 2, wherein the primary billet in step one is a square billet having a side length of 300mm to 500 mm.
4. The method for preparing the TC6 titanium alloy large-size bar according to claim 1, wherein the forging temperature in the drawing and cogging forging in the step one is 1000-1150 ℃, and the forging ratio is 1.8-2.4.
5. The method for preparing the TC6 titanium alloy large-size bar according to claim 1, wherein the forging ratio of the first drawing and rolling forging in the second step is 2.0-2.6.
6. The method for preparing the TC6 large-size bar of titanium alloy according to claim 1, wherein the drawing in the third step is performed by a V-shaped anvil, and the forging ratio of the second drawing and rolling forging is 2.1-3.3.
7. The method of claim 1, wherein the reduction in the bloom forging in step one, the first elongation and rounding forging in step two, and the second elongation and rounding forging in step three is 15% to 40%.
8. The method of claim 1, wherein the first elongation and rounding forging in step two and the second elongation and rounding forging in step three are followed by surface grinding.
9. The method for preparing the TC6 titanium alloy large-size bar according to claim 1, wherein the slitting and blanking in the second step and the third step are performed with 2-3 equal-division sawing.
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| CN115976441A (en) * | 2023-03-03 | 2023-04-18 | 中南大学 | Heat treatment method of TC18 titanium alloy |
| CN115976441B (en) * | 2023-03-03 | 2023-05-12 | 中南大学 | Heat treatment method of TC18 titanium alloy |
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| CN113172115B (en) | 2022-07-08 |
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