A preparation method for a large single-weight slab of TC4 titanium alloy

Abstract

The present invention discloses a method for preparing a large single-weight slab of TC4 titanium alloy, comprising the following steps: first, perform cogging forging in two heats, and use a large round table tool and die with an upper and lower diameter of 1200 mm, then perform intermediate billet forging in five heats, and finally perform finished product forging in one heat, and then obtain the target slab through machining. The process of the present invention reduces the number of forging heats compared with the prior art, shortens the production cycle, reduces the high-temperature oxidation material loss caused by repeated heating of materials, saves production costs, and at the same time prepares a large single-weight slab with uniform tissue flaw detection; by this method, TC4 titanium alloy slabs with a single weight of 1.5 to 8 t, a thickness of 100 to 300 mm, a width of 60 to 750 mm, and a length of 6000 to 8000 mm are produced, and the results of ultrasonic flaw detection at different positions of the produced slabs are uniform and consistent, all reaching above Φ1.2-6 dB, and at the same time, they also have the advantages of good tissue and performance uniformity, etc.

Description

Technical Field

[0001] The invention belongs to the technical field of titanium alloy slab preparation, and in particular relates to a method for preparing a TC4 titanium alloy large single weight slab. Background Art

[0002] TC4 (Ti-6Al-4V) titanium alloy is a medium-strength α+β two-phase titanium alloy containing 6% α-stabilizing element Al and 4% β-stabilizing element V. The alloy has excellent comprehensive properties and has been widely used in the aviation industry, mainly for aircraft structural parts and engine fan and compressor disks and blades.

[0003] At present, with the rapid development of the aviation industry, in order to improve the safety and reliability of aircraft and extend its service life, the development trend of aircraft is that the load-bearing parts need to adopt large forgings and large integral forgings. In order to meet the research and production of large forgings and large integral forgings, high-quality and large single-weight titanium alloy slabs are needed. However, TC4 slabs with a single weight exceeding 4t have never been produced. At the same time, the larger the single weight of the slab, the more difficult it is to control its uniformity of organization and flaw detection. In the traditional slab preparation method, in order to ensure the uniformity of organization and performance, it is necessary to perform multiple fires of repeated upsetting below the phase change point. However, multiple fires of upsetting forging are prone to produce deformation dead zones. The organization of the deformation dead zone cannot be effectively refined at a lower temperature, resulting in poor organization uniformity and poor uniformity of flaw detection level. In addition, the production cycle of the slab is also long. In addition, the multiple fires process increases the high-temperature oxidation material loss caused by repeated heating of the material, which increases the production cost.

[0004] In view of this, the inventors propose a method for preparing a large single-weight slab of TC4 titanium alloy to overcome the defects of the prior art. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a method for preparing large single-weight slabs of TC4 titanium alloy, which solves the problems of long production cycle, poor uniformity of structure and ultrasonic flaw detection when preparing large single-weight slabs in the prior art; in addition, the number of fires used in this preparation method is greatly reduced compared with traditional technology, reducing high-temperature oxidation material loss caused by repeated heating of materials and saving production costs.

[0006] The purpose of the present invention is to be solved by the following technical solutions:

[0007] A method for preparing a TC4 titanium alloy large single weight slab, wherein the raw material of the TC4 titanium alloy large single weight slab is a TC4 titanium alloy ingot with a size of 3 to 11 tons and a specification of Φ720 to Φ1020 mm, and the chemical composition of the ingot meets the requirements of GJB 2218A-2018, and the preparation method specifically comprises the following steps:

[0008] Step 1: Forging

[0009] The ingot is heated to 150°C to 350°C above the phase transformation point, kept warm for 400min to 600min, and forged once, then returned to the furnace to 100°C to 200°C above the phase transformation point, kept warm for 60min to 180min, and forged once again, with the final forging temperature being not less than 800°C. After forging, the blank is cooled in air to obtain a forging blank 1;

[0010] Step 2: Forging of intermediate billet

[0011] The forging blank 1 obtained in step 1 is heated and kept at 60° C. below the phase transformation point to 150° C. above the phase transformation point, and forged for 5 times respectively, with the final forging temperature not less than 700° C. After each forging, the blank is air-cooled to obtain a forging blank 2;

[0012] Step 3: Finished product forging

[0013] The forging blank 2 obtained in step 2 is heated to 20°C to 60°C below the phase transformation point, kept warm for 300min to 420min, and then immediately stretched and shaped. After the stretching and shaping is completed, it is air-cooled to obtain the forging blank 3; then the forging blank 3 is machined to the target size to obtain the TC4 titanium alloy large single weight slab.

[0014] Furthermore, the specific process of the two-fire forging in step 1 is: heating and keeping the ingot warm, then upsetting and drawing, the forging ratio during upsetting is controlled between 1.6 and 1.8, and the deformation during drawing is controlled between 50% and 60%; returning to the furnace for insulation, then upsetting and drawing, the forging ratio during upsetting is controlled between 1.6 and 1.8, and the deformation during drawing is controlled between 50% and 60%.

[0015] Furthermore, in the step 1, the tooling dies for upsetting and drawing all adopt a truncated table with a height of 1200 mm, so as to ensure uniform deformation of the material and facilitate homogenization of the structure.

[0016] Furthermore, the specific process of the 5-fire forging in step 2 is as follows: the heating temperature of the first fire is 10°C to 30°C below the phase transformation point, and after keeping warm for 600min to 750min, upsetting and drawing are performed; the heating temperature of the second fire is 90°C to 150°C above the phase transformation point, and after keeping warm for 500min to 650min, upsetting and drawing are performed; the heating temperatures of the third, fourth and fifth fires are all 20°C to 60°C below the phase transformation point, and after keeping warm for 400min to 650min, drawing is performed directly.

[0017] Furthermore, in the step 2, the forging ratio during upsetting is controlled between 1.5 and 1.8, and the deformation during drawing is controlled between 40% and 50%.

[0018] Furthermore, when the 3rd, 4th and 5th fires are directly used for stretching, the feeding amount is 130 mm to 300 mm, and the pressing amount is 40 mm to 90 mm.

[0019] Furthermore, in the step three, the deformation during forging is controlled between 5% and 20%, and the final forging temperature is not less than 700°C.

[0020] Furthermore, the forging method is used to produce TC4 titanium alloy slabs with a unit weight of 1.5t to 8t, a thickness of 100mm to 300mm, a width of 600mm to 750mm, and a length of 6000mm to 8000mm. The ultrasonic flaw detection results of the produced titanium alloy slabs at different positions are uniform and consistent, all reaching above Φ1.2-6dB, and the organizational uniformity is good.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The invention discloses a preparation method of a TC4 titanium alloy large single weight slab. Compared with a traditional preparation method, the preparation process has fewer forging times, reduces high-temperature oxidation material loss caused by repeated heating of materials, shortens the production cycle, and saves production costs. The preparation method can produce TC4 titanium alloy slabs with a single weight of 1.5t to 8t, a thickness of 100mm to 300mm, a width of 600mm to 750mm, and a length of 6000mm to 8000mm. After actual testing, the flaw detection level of each position of the produced slab can meet Φ1.2-6dB or above, the flaw detection uniformity is good, the organization and mechanical properties meet the requirements of GJB 2218A-2018, and the slabs also have the advantages of good organization and performance uniformity, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are incorporated in and constitute a part of this specification and, together with the description, serve to explain the principles of the present invention.

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0025] Figure 1 This is a process flow chart of preparing a large single-weight slab of TC4 titanium alloy according to the present invention;

[0026] Figure 2 It is a simulation diagram of the temperature field and strain field at each position of the material deformation process when preparing a large single-weight slab of TC4 titanium alloy according to the present invention;

[0027] Figure 3This is a macroscopic structural diagram of a slab of 240×650×6000 mm and a unit weight of 4.2 t prepared in Example 1;

[0028] Figure 4 The microstructure diagrams of the slabs of 240×650×6000 mm and 4.2 t in forging state at different positions prepared in Example 1 are shown;

[0029] Figure 5 It is a mechanical property diagram of the 240×650×6000 mm and 4.2 t single weight slab prepared in Example 1 at different annealing positions;

[0030] Figure 6 This is a macroscopic structural diagram of a slab of 250×750×7000 mm and a unit weight of 5.9 t prepared in Example 2;

[0031] Figure 7 The microstructure diagrams of the slabs of 250×750×7000 mm and 5.9 t in forging state at different positions prepared in Example 2 are shown;

[0032] Figure 8 This is a diagram of the mechanical properties of the 250×750×7000mm and 5.9t single weight slab prepared in Example 2 at different annealing positions. DETAILED DESCRIPTION

[0033] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices consistent with some aspects of the present invention as detailed in the appended claims.

[0034] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0035] See also Figure 1 As shown, the present invention provides a method for preparing a TC4 titanium alloy large single weight slab, wherein the raw material of the TC4 titanium alloy large single weight slab adopts a TC4 titanium alloy ingot with a size of 3 to 11 tons and a specification of Φ720 to Φ1020 mm, and the chemical composition of the ingot meets the requirements of GJB2218A-2018, and is characterized in that the preparation method specifically comprises the following steps:

[0036] Step 1: Forging

[0037] Specifically, the ingot is heated to 150° C. to 350° C. above the phase transformation point, kept warm for 400 min to 600 min, and subjected to one round of forging. After the ingot is heated and kept warm, it is subjected to upsetting, the forging ratio is controlled between 1.6 and 1.8 during upsetting, and the deformation is controlled between 50% and 60% during elongation; then the ingot is returned to the furnace to 100° C. to 200° C. above the phase transformation point, kept warm for 60 min to 180 min, and subjected to one round of upsetting, the forging ratio is controlled between 1.6 and 1.8 during upsetting, and the deformation is controlled between 50% and 60% during elongation. During upsetting, the tooling dies are both large round tables with a length of 1200 mm, and the final forging temperatures are not less than 800° C. After forging, the blank is cooled in air to obtain a forged blank 1;

[0038] Step 2: Forging of intermediate billet

[0039] The forging blank 1 obtained in step 1 is heated and kept at 60° C. below the phase transformation point to 150° C. above the phase transformation point, and forged for 5 times respectively, with the final forging temperature not less than 700° C. After each forging, the blank is air-cooled to obtain a forging blank 2;

[0040] Among them, the specific process of 5-fire forging is as follows: the heating temperature of the first fire is 10℃~30℃ below the phase transformation point, and after keeping warm for 600min~750min, upsetting is carried out, and the forging ratio during upsetting is controlled between 1.5~1.8, and the deformation during drawing is controlled between 40%~50%; the heating temperature of the second fire is 90℃~150℃ above the phase transformation point, and after keeping warm for 500min~650min, upsetting is carried out, and the forging ratio during upsetting is controlled between 1.5~1.8, and the deformation during drawing is controlled between 40%~50%; the heating temperature of the third, fourth and fifth fires is 20℃~60℃ below the phase transformation point, and after keeping warm for 400min~650min, drawing is directly carried out, and the deformation during drawing is controlled between 40%~50%, the feed amount is 130mm~300mm, and the reduction amount is 40mm~90mm;

[0041] Step 3: Finished product forging

[0042] The forging blank 2 obtained in step 2 is heated to 20°C to 60°C below the phase transformation point, kept warm for 300min to 420min, and then immediately stretched and shaped. After the stretching and shaping is completed, it is air-cooled to obtain the forging blank 3; then the forging blank 3 is machined to the target size to obtain the TC4 titanium alloy large single weight slab.

[0043] In order to further verify the efficacy of the preparation method of the present invention, the inventors carried out the following specific examples (selecting TC4 titanium alloy with a phase transition point of 990° C.):

[0044] Example 1

[0045] Preparation of TC4 titanium alloy slab with specifications of 240×650×6000mm and single weight of 4.2t: Select 6-ton TC4 titanium alloy ingot with specifications of Φ920mm, whose chemical composition meets the requirements of GJB 2218A-2018 as raw material. The specific production steps are as follows:

[0046] 1) Performing 2-time forging: heating temperature is 1190° C. to 1210° C., holding temperature for 500 min to 560 min, and then performing upsetting and drawing, the forging ratio during upsetting is controlled at 1.7, and the deformation during drawing is controlled at 50%, and then returning to the furnace to 1140° C. to 1160° C. and holding temperature for 120 min to 180 min, and then performing upsetting and drawing, the forging ratio during upsetting is controlled at 1.6, and the deformation during drawing is controlled at 50%, and the tooling die during upsetting and drawing adopts a large round table with a length of 1200 mm above and below, and the specification after forging is □ (□ indicates a square shape) 1050×L, and the final forging temperature is controlled at above 800° C. The material after forging is cooled by air cooling to obtain a forging blank 1;

[0047] 2) The obtained forging blank 1 is forged, which is completed in 5 fires: the heating temperature of the first fire is 960℃~980℃, and it is kept warm for 600min~660min before upsetting; the heating temperature of the second fire is 1090℃~1110℃, and it is kept warm for 500min~560min before upsetting; the heating temperature of the third fire is 950℃~970℃, and it is kept warm for 550min~600min before straight drawing, with a feed amount of 250mm~300mm and a reduction amount of 60mm~90mm; the heating temperature of the fourth fire is 940℃~960℃, and it is kept warm for 500min After 560min of heating, straight drawing is performed, the feed amount is 150mm-200mm, and the reduction amount is 40mm-70mm; the heating temperature of the fifth fire is 930℃-950℃, and after keeping warm for 450min-510min, straight drawing is performed, the feed amount is 150mm-200mm, and the reduction amount is 40mm-70mm. The forging ratio of the above fire upsetting is controlled at 1.7, and the deformation amount during drawing is controlled at 40%. The specification after the fifth fire forging is 280×670×L, and the final forging temperature is controlled at more than 700℃. After each fire forging is completed, air cooling is used to cool the forging blank 2;

[0048] 3) The finished product forging is completed in one fire. The forging blank 2 is heated to 930°C~950°C, kept warm for 300min~360min, and then directly drawn and shaped to 260×670×L. The deformation of the straight drawing is 7%, and the final forging temperature is controlled above 700°C. After the finished product forging fire is completed, the forging blank 3 is cooled by air cooling, and then the forging blank 3 is planed / milled by a planer / milling machine to become a 240×650×6000mm slab, that is, a TC4 titanium alloy slab with a specification of 240×650×6000mm and a single weight of 4.2t is prepared.

[0049] Example 2

[0050] Preparation of TC4 titanium alloy slab with specifications of 250×750×7000mm and single weight of 5.9t: Select 9-ton TC4 titanium alloy ingot with specifications of Φ1020mm, whose chemical composition meets the requirements of GJB 2218A-2018 as raw material. The specific production steps are as follows:

[0051] 1) Performing 2-time forging: heating temperature is 1140°C-1160°C, holding temperature for 600min-650min, and then performing upsetting and drawing, the forging ratio during upsetting is controlled at 1.8, and the deformation during drawing is controlled at 60%, returning to the furnace to 1100°C-1120°C and holding temperature for 120min-180min, and then performing upsetting and drawing, the forging ratio during upsetting is controlled at 1.7, and the deformation during drawing is controlled at 60%, and the tooling die during upsetting and drawing adopts a large round table with a length of 1200mm above and below, the specification after forging is □1300×L, the final forging temperature is controlled at above 800°C, and the material after forging is cooled by air cooling to obtain a forging blank 1;

[0052] 2) The obtained forging blank 1 is forged in 5 fires: the heating temperature of the first fire is 960℃~980℃, and the upsetting is performed after the heat preservation for 650min~710min; the heating temperature of the second fire is 1120℃~1140℃, and the upsetting is performed after the heat preservation for 600min~650min; the heating temperature of the third fire is 950℃~970℃, and the heat preservation is performed after 600min~650min, and the straight drawing is performed, the feed amount is 250mm~300mm, and the reduction amount is 60mm~90mm; the heating temperature of the fourth fire is 950℃~970℃, and the heat preservation is performed for 550min After 500min to 610min, straight drawing is performed, the feed amount is 250mm to 300mm, and the reduction amount is 60mm to 90mm; the heating temperature of the fifth fire is 940℃ to 960℃, and the heat preservation time is 500min to 560min. After that, straight drawing is performed, the feed amount is 150mm to 200mm, and the reduction amount is 40mm to 70mm. The forging ratio of the above fire upsetting is controlled at 1.8, and the deformation amount during drawing is controlled at 50%. The specification after the fifth fire forging is 290×780×L, and the final forging temperature is controlled at more than 700℃. After each fire forging is completed, air cooling is used to cool the forging blank 2;

[0053] 3) The finished product forging is completed in one fire. The forging blank 2 is heated to a temperature of 940°C to 960°C, kept warm for 350min to 410min, and then directly drawn and shaped to 260×770×L. The deformation of the straight drawing is 10%, and the final forging temperature is controlled above 700°C. After the finished product forging fire is completed, the forging blank 3 is cooled by air cooling to obtain the forging blank 3, and then the forging blank 3 is planed / milled by a planer / milling machine to become a 250×750×7000mm slab, that is, a TC4 titanium alloy slab with a specification of 250×750×7000mm and a single weight of 5.9t is prepared.

[0054] Result analysis:

[0055] 1. Analysis of uniformity of slab deformation process:

[0056] During the production process of slabs, a tool with a 1200mm upper and lower circular table is used for upsetting and drawing of the slab to ensure uniform deformation, which is conducive to improving the uniformity of the structure, and the forging process is simulated and analyzed;

[0057] according to Figure 2 It can be seen that the temperature field and strain field at each position during the material deformation process are evenly distributed, indicating that the material deformation uniformity is good.

[0058] 2. High and low magnification tissue analysis

[0059] The 240×650×6000 mm slab prepared in Example 1 was observed by high and low magnification microstructure:

[0060] according to Figure 3 It can be seen that the macrostructure of the slab prepared in Example 1 has no cracks, inclusions, segregation, shrinkage holes, pores and other metallurgical defects, and no obvious clear grains visible to the naked eye, all of which are uniform fuzzy crystals, meeting the requirements of GJB 2218A-2018.

[0061] according to Figure 4 It can be seen that the forged high-magnification microstructures at different positions of the slab prepared in Example 1 are all microstructures processed in the α-β phase region, with equiaxed and elongated primary α on the transformed β matrix, no continuous α network on the original β grain boundary, and good uniformity of microstructure at different positions, all meeting the requirements of GJB 2218A-2018.

[0062] The 250×750×7000 mm slab prepared in Example 2 was observed by high and low magnification microstructure:

[0063] according to Figure 6 It can be seen that the macrostructure of the slab prepared in Example 2 has no cracks, inclusions, segregation, shrinkage holes, pores and other metallurgical defects, and no obvious clear grains visible to the naked eye, all of which are uniform fuzzy crystals, meeting the requirements of GJB 2218A-2018.

[0064] according to Figure 7 It can be seen that the forged high-magnification microstructures at different positions of the slab prepared in Example 2 are all microstructures processed in the α-β phase region, with equiaxed and elongated primary α on the transformed β matrix, no continuous α network on the original β grain boundary, and good uniformity of the microstructures at different positions, all meeting the requirements of GJB 2218A-2018.

[0065] 3. Mechanical properties analysis

[0066] The 240×650×6000 mm slab prepared in Example 1 was subjected to transverse test at different positions and subjected to air cooling at 790°C for 2 hours. The room temperature properties were tested.

[0067] according to Figure 5 It can be seen that the room temperature performance results of the slab prepared in Example 1 tested at different positions all meet the requirements of GJB2218A-2018, with good uniformity and a certain margin.

[0068] Transverse test pieces were taken from different positions of the 250×750×7000 mm slab prepared in Example 2 and subjected to air cooling at 790° C. for 2 h, and then the room temperature properties were tested.

[0069] according to Figure 8 It can be seen that the room temperature performance results of the slab prepared in Example 2 tested at different positions all meet the requirements of GJB2218A-2018, with good uniformity and a certain margin.

[0070] 4. Analysis of ultrasonic flaw detection results

[0071] After ultrasonic flaw detection, the ultrasonic flaw detection results of different positions of the slabs prepared in Example 1 and Example 2 were uniform and consistent, and both reached the requirement of Φ1.2-6dB or above.

[0072] To sum up, the present invention provides a method for preparing a large single-weight TC4 titanium alloy slab, in which the prepared TC4 titanium alloy slab has a thickness of 100mm-300mm, a width of 600mm-750mm, and a length of 6000mm-8000mm, and the low-magnification structure has no obvious metallurgical defects, and the structure is uniform and fuzzy crystals; the forged high-magnification structure at different positions is a uniform equiaxed structure, and after air cooling treatment at 790℃ / 2h, room temperature performance tests are carried out at different positions, and the standard requirements are also met; at the same time, the ultrasonic flaw detection at different positions of the slab reaches above Φ1.2-6dB.

[0073] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention.

[0074] It should be understood that the present invention is not limited to what has been described above and that various modifications and changes may be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A method for preparing a TC4 titanium alloy large single weight slab, wherein the raw material of the TC4 titanium alloy large single weight slab is a TC4 titanium alloy ingot with a size of 3 to 11 tons and a specification of Φ720 to Φ1020 mm, and the chemical composition of the ingot meets the requirements of GJB 2218A-2018, It is characterized in that The preparation method specifically comprises the following steps: Step 1: Forging The ingot is heated to 150°C to 350°C above the phase transformation point, kept warm for 400min to 600min, and forged once, then returned to the furnace to 100°C to 200°C above the phase transformation point, kept warm for 60min to 180min, and forged once again, with the final forging temperature being not less than 800°C. After forging, the blank is cooled in air to obtain a forging blank 1; Step 2: Forging of intermediate billet The forging blank 1 obtained in step 1 is heated and kept at 60° C. below the phase transformation point to 150° C. above the phase transformation point, and forged for 5 times respectively, with the final forging temperature not less than 700° C. After each forging, the blank is air-cooled to obtain a forging blank 2; Step 3: Finished product forging The forging blank 2 obtained in step 2 is heated to 20°C to 60°C below the phase transformation point, kept at this temperature for 300min to 420min, and then stretched and shaped immediately, and air-cooled after the stretching and shaping is completed to obtain the forging blank 3; and then the forging blank 3 is machined to the target size, that is, the TC4 titanium alloy large single weight slab is obtained; The specific process of the five-fire forging in step 2 is as follows: the heating temperature of the first fire is 10°C to 30°C below the phase transformation point, and after being kept warm for 600min to 750min, upsetting is performed; the heating temperature of the second fire is 90°C to 150°C above the phase transformation point, and after being kept warm for 500min to 650min, upsetting is performed; the heating temperatures of the third, fourth and fifth fires are all 20°C to 60°C below the phase transformation point, and after being kept warm for 400min to 650min, upsetting is performed directly, and during upsetting, the feed amount is 130mm to 300mm, and the reduction amount is 40mm to 90mm; the forging ratio during upsetting in step 2 is controlled between 1.5 and 1.8, and the deformation amount during upsetting is controlled between 40% and 50%; The preparation method is used to produce TC4 titanium alloy slabs with a unit weight of 1.5t to 8t, a thickness of 100mm to 300mm, a width of 600mm to 750mm, and a length of 6000mm to 8000mm. The ultrasonic flaw detection results of the produced titanium alloy slabs at different positions are uniform and all reach above Φ1.2-6dB, and the uniformity of the structure is good.

2. The method for preparing a large single-weight TC4 titanium alloy slab according to claim 1, It is characterized in that The specific process of the two-fire forging in step 1 is: heating and keeping the ingot warm before upsetting, the forging ratio during upsetting is controlled between 1.6 and 1.8, and the deformation during elongation is controlled between 50% and 60%; returning to the furnace for warming before upsetting, the forging ratio during upsetting is controlled between 1.6 and 1.8, and the deformation during elongation is controlled between 50% and 60%.

3. The method for preparing a large single-weight TC4 titanium alloy slab according to claim 2, It is characterized in that In the step 1, the tooling die for upsetting and drawing is a round table with a height of 1200 mm.

4. The method for preparing a large single-weight TC4 titanium alloy slab according to claim 1, It is characterized in that In the step 3, the deformation during forging is controlled between 5% and 20%, and the final forging temperature is not less than 700°C.

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