A processing method for nearly β-type titanium alloy TB10 forging rod

Abstract

A method for processing a near-β-type titanium alloy TB10 forging rod, the method comprising the steps of batching of near-β-type TB10 titanium alloy, ingot preparation, blanking forging, three-way upsetting forging, two-way upsetting forging, microstructure homogenization treatment, low-temperature upsetting forging, finished product forging, solution aging heat treatment, etc. The prepared near-β-type TB10 forging rod has a diameter of not less than 100 mm, a tensile strength of not less than 1200 MPa, a yield strength of not less than 1100 MPa, an elongation after fracture of not less than 12%, and a cross-sectional shrinkage of not less than 40%. The forging rod has high tensile strength and excellent plasticity, and can be used in the fields of aviation, aerospace, petroleum, ships, and chemical industry.

Description

Technical Field

[0001] The invention relates to a method for processing a titanium alloy forging rod, in particular to a method for processing a high-strength, high-plasticity and large-size forging rod of a near-β-type titanium alloy TB10. Background Art

[0002] High-strength titanium alloy bars are mainly forged bars of alloys such as TC18, TC21, TB2 and TB6, and the processing methods include forging, rolling, radial forging, etc. The nominal composition of TC18 alloy is Ti-5Mo-5V-lCr-5Al-1Fe, and the Russian grade is BT22. It is a high-alloyed, high-strength near-β-type titanium alloy successfully developed by the Soviet Union in the 1970s. It has the performance characteristics of both α+β and β-type titanium alloys. The content of α phase and β phase in the annealed TC18 alloy is almost equal, and the strength can reach 1080MPa. The strength in the double annealed state is above 1100MPa. It is mainly used for large forgings and large integral components. TC21 alloy was developed on the basis of the American Ti-62222S alloy. Its nominal composition is Ti-6Al-2Mo-2Zr-2Sn-2Nb-1.5Cr. It has high strength (R m ≥1100MPa), high toughness (K IC 70~90MPa·m 1 / 2 ), damage tolerance (low crack growth rate da / dN), weldable α+β two-phase titanium alloy. The nominal composition of TB6 alloy is Ti-10V-2Fe-3Al, and the US grade is Ti-1023. It was successfully developed by Timet in the United States in 1971 and is the most widely used high-strength and tough near-β titanium alloy. After heat treatment, the alloy has an Rm of 965~1310MPa and K IC 99~33MPa·m 1 / 2, with a good matching relationship between strength and toughness. In addition, the alloy has good forging properties and can provide medium, high strength and high toughness bars, plates or forgings with a cross-section thickness of up to 125mm. It has been used in the main landing gear struts of Boeing 777 and Airbus A380 aircraft. There is 2% of the slow eutectoid element Fe in the alloy, which is easy to produce "β spots" due to component segregation during smelting, limiting the application and development of the alloy. Timetal555 (Ti-5Mo-5V-3Cr-5Al-0.6Fe) alloy, also known as Ti5553, is a new type of high-strength metastable β titanium alloy developed by Boeing and VSMPO of Russia on the basis of BT22 alloy by adding Cr content. The alloy has high strength and high toughness, and its strength can reach 1517MPa, thus replacing Ti-1023 alloy in the main landing gear of Boeing 777. The strength-plasticity-toughness matching of Timet555 alloy is better than that of existing Ti-1023 and BT22 alloys, and its higher hardenability is more suitable for heat treatment of large forgings. At the same time, the newly designed VST55531 (Ti-5Mo-5V-3Cr-5Al-1Zr) alloy of Russia is a new titanium alloy jointly developed by Russia's VSMPO and European Airbus and applied to the A380 aircraft. The alloy does not contain Fe elements, which fundamentally eliminates the generation of "β spots". The alloy has good hardenability and good fracture toughness and strength matching characteristics, so it is more suitable for parts requiring high strength and toughness such as aircraft shadow suspension joints, landing gear, and landing wing joints.

[0003] Since the 1970s, Ti-5Mo-5V-8Cr-3Al (TB2) and Ti-5Mo-5V-2Cr-3Al (TB10) developed by Beijing Nonferrous Metals Research Institute have been widely used. TB2 alloy mainly stabilizes the β phase through Mo, Cr and V, and the addition of V is beneficial to improve the plasticity of the alloy. The typical heat treatment process is a solution temperature slightly higher than the β phase transformation point (800±10)℃, insulation for 3-30min, air cooling; aging temperature (500±10)℃, insulation time 8-24h, air cooling or furnace cooling. After the TB2 alloy is treated by this process, its Rm after aging is 1100-1300MPa, and A is about 12%. It has high strength and good plasticity matching in the solution aging state. However, when this alloy is used as a large forging, it has a large forging resistance and needs to be forged at a high temperature of 1000℃, but it is also difficult to ensure that the entire section obtains sufficient deformation. TB10 titanium alloy is a high-strength and high-toughness near-β-type titanium alloy obtained by reducing the Cr content on the basis of the development of TB2 alloy. The total content of β-stable elements in the alloy is near the critical concentration, which makes the alloy have the performance characteristics of (α+β) alloy and metastable β-type alloy, with high specific strength and good fracture toughness. In order to obtain good comprehensive properties of the alloy, the method of two-phase solid solution plus secondary aging is generally adopted, and its tensile strength can reach 1350MPa and the elongation after fracture is above 6%. TB10 alloy is mainly used for aerospace structural parts, and can also be used to manufacture forged parts in aircraft fuselage and wing structures. Based on the analysis of major high-strength and high-toughness titanium alloys at home and abroad, Beijing Nonferrous Metals Research Institute and Baoti Group have conducted systematic research on the Ti-Mo-V-Cr-Al alloy system and developed a high-strength and high-toughness metastable β titanium alloy BTi-6554 (Ti-6Cr-5Mo-5V-4Al) titanium alloy. The alloy has the best match of strength-plasticity-toughness and excellent fatigue resistance, good cold and hot processing performance, and is suitable for the production of large-size forgings. The room temperature strength of the Φ9mm-Φ90mm alloy bars developed by the company reaches more than 1400MPa after solid solution + aging treatment. The bars, wires and large-size forgings developed by the company have been successfully applied in the fields of aviation and aerospace.

[0004] When the specifications (forging thickness or diameter) of these high-strength titanium alloys are greater than 100mm, the tensile strength is usually above 1100MPa, and when the tensile strength is above 1200MPa, the elongation after fracture is usually not more than 10%. Now, some aviation parts have put forward new requirements: tensile strength not less than 1200MPa, yield strength not less than 1100MPa, elongation after fracture not less than 12%, and section shrinkage not less than 40%. Summary of the invention

[0005] Aiming at the requirements of certain aviation parts, the present invention provides a method for processing a near-β-type titanium alloy TB10 forging rod with high strength, high elongation and a diameter of more than 100 mm.

[0006] To achieve the above object, the present invention includes the following technical solutions:

[0007] A method for processing a near-β-type titanium alloy TB10 forging rod, the method comprising the following steps:

[0008] (1) Near-β titanium alloy TB10 is formulated in the following proportions: Mo: 4.5-5.5wt%, V: 4.5-5.5wt%, Cr: 1.5-2.5wt%, Al: 2.5-3.5wt%, Fe: <0.30wt%, C: <0.05wt%, N: <0.04wt%, H: <0.015wt%, O: <0.15wt%, and the balance is titanium;

[0009] (2) pressing the ingredients into electrodes, and smelting them three times in a vacuum consumable electric furnace to obtain an ingot;

[0010] (3) Forging at 950-1050°C to obtain a square billet;

[0011] (4) Three-way upsetting forging at 850-950℃, not less than 6 times, and the deformation of each upsetting process is not less than 63%;

[0012] (5) Two-way upsetting and drawing forging at 750-800℃, not less than 3 times, and the deformation of each upsetting and drawing pass is not less than 55%;

[0013] (6) Keep the temperature in a box-type resistance furnace for no less than 2 hours at a temperature of 800-850°C, and cool by furnace cooling or air cooling;

[0014] (7) Two-way upsetting and drawing forging at 700-750°C, with the deformation of each pass not less than 50%;

[0015] (8) The finished product is forged at 700-750℃, formed in one step, and tempering is not allowed;

[0016] (9) Solution aging is carried out in a box-type resistance furnace, the solution temperature is 700-800°C, the insulation time is 0.5-3 hours, and the aging temperature is 400-650°C, the insulation time is 2-24 hours;

[0017] (10) Polishing rod, flaw detection, and the finished product is obtained after passing the test.

[0018] Preferably, the near-β-type titanium alloy TB10 in step (1) is formulated in the following proportions: Mo: 4.9-5.3wt%, V: 4.9-5.3wt%, Cr: 1.9-2.3wt%, Al: 2.8-3.3wt%, Fe: <0.25wt%, C: <0.03wt%, N: <0.03wt%, H: <0.01wt%, O: <0.09wt%, and the balance is titanium.

[0019] In step (2), MoAl (Mo content is 72wt%), VAl (V content is 81wt%) intermediate alloy, pure Cr and Al foil are mixed evenly with sponge titanium according to the above-mentioned proportions and pressed into electrodes.

[0020] In step (2), the diameter of the ingot obtained after three smeltings is Φ (550-650) mm.

[0021] In step (3), the billet is forged at 980-1030° C. to obtain a square billet.

[0022] In step (4), after the square billet is ground and cut, it is subjected to three-way upsetting forging at 930-950° C., 890-910° C., and 850-870° C. for 2 times, with deformation amounts of 69-71%, 65-67%, and 63-65% respectively, for a total of 6 times, with 100% grinding between each time.

[0023] In step (5), two-way upsetting forging is performed at 790-800° C., 770-780° C., and 750-760° C., respectively, with deformation amounts of 59-61%, 57-58%, and 55-56%, respectively; a total of 3 fires are performed, with 100% grinding between each fire.

[0024] In step (6), the billet is cold charged into a furnace, heated to 820-840° C. in a box-type resistance furnace, kept at this temperature for 2.5-3 hours, and air-cooled.

[0025] In step (7), two-way upsetting forging is performed at 710-730° C., and the deformation amount is 51-53%.

[0026] In step (8), the finished product is forged at 720-740° C., formed in one step, and the size of the forged rod is Φ140-180 mm.

[0027] In step (9), the solution temperature is 740-760° C., and the temperature is kept at this temperature for 1-2 hours; and the aging temperature is 500-550° C., and the temperature is kept at this temperature for 4-6 hours.

[0028] In step (10), the polished rod is machined to a finished product size of Φ100 mm or more, preferably Φ120-160 mm, and is subjected to Class A flaw detection. If the test is qualified, the finished product is obtained.

[0029] On the other hand, the present invention also includes a near-β-type titanium alloy TB10 forging rod, which is produced by the processing method as described above.

[0030] Beneficial effects of the present invention: The nearly β-type titanium alloy TB10 forged rod prepared by the method of the present invention is 40% lighter than high-strength stainless steel of the same size and strength. Compared with other grades of high-strength titanium alloys, the finished product has a diameter of more than 100 mm, a tensile strength of more than 1200 MPa, a yield strength of more than 1100 MPa, an elongation after fracture of not less than 12%, and a cross-sectional shrinkage of not less than 40%. DETAILED DESCRIPTION

[0031] The present invention will be further described below in conjunction with the embodiments, but is not limited to the contents of the description.

[0032] Example 1

[0033] Preparation of finished bar Φ160mm. The preparation process is as follows:

[0034] (1) The ingredients are prepared in the following proportions, wherein the ingredients of TB10 are: Mo: 4.9wt%; V: 5.1wt%; Cr: 1.9wt%; Al: 3.1wt%; Fe: 0.09wt%; C: 0.006wt%; N: 0.008wt%; H: 0.0011wt%; O: 0.08wt%; the balance is titanium;

[0035] (2) MoAl (Mo content is 72wt%), VAl (V content is 81wt%) master alloy, pure Cr and Al foil, according to the above-mentioned proportion, are mixed evenly with sponge titanium and pressed into electrodes; Φ630mm ingots are obtained by three smelting in a vacuum consumable electric furnace;

[0036] (3) Forging at 1030°C to obtain a square billet with a cross section of 500×500 mm;

[0037] (4) After the billet is ground and cut, it is subjected to three-way upsetting forging at 950℃, 900℃ and 850℃ for 2 times, with deformations of 71%, 67% and 63% respectively; a total of 6 times, with 100% grinding between each time;

[0038] (5) Two-way upsetting forging at 800℃, 770℃ and 750℃, respectively, with deformation of 61%, 57% and 55% respectively; a total of 3 times, with 100% grinding between each time;

[0039] (6) Billet cold charging furnace: heat to 840°C in a box-type resistance furnace, keep warm for 2.5 hours, and air cool;

[0040] (7) Two-way upsetting forging at 730°C, with a deformation of 53%;

[0041] (8) Forging the finished product at 720℃, forming in one step, the forging rod size is Φ180mm;

[0042] (9) Solution aging was carried out in a box-type resistance furnace at a solution temperature of 740°C for 2 hours and an aging temperature of 510°C for 6 hours;

[0043] (10) The finished product size of the polished rod is Φ160 mm, and the A-level flaw detection is passed. Sample 1 is obtained after passing the test.

[0044] Example 2

[0045] Preparation of finished bar Φ120mm. The preparation process is as follows:

[0046] (1) The ingredients are prepared in the following proportions, wherein the ingredients of TB10 are: Mo: 5.1wt%; V: 5.0wt%; Cr: 2.1wt%; Al: 3.0wt%; Fe: 0.08wt%; C: 0.006wt%; N: 0.008wt%; H: 0.0011wt%; O: 0.06wt%; the balance is titanium;

[0047] (2) MoAl (Mo content is 72wt%), VAl (V content is 81wt%) master alloy, pure Cr and Al foil, according to the above-mentioned proportion, are mixed evenly with sponge titanium and pressed into electrodes; Φ580mm ingots are obtained by three smelting in a vacuum consumable electric furnace;

[0048] (3) Forging at 990°C to obtain a square billet with a cross section of 500×500 mm;

[0049] (4) After the billet is ground and cut, it is subjected to three-way upsetting and forging at 940℃ and 900℃ for 2 times, with deformations of 69% and 65% respectively, and three-way upsetting and forging at 860℃ for 3 times, with deformation of 63%; a total of 7 times, with 100% grinding between each time;

[0050] (5) Two-way upsetting and drawing forging at 800℃ for 2 times, deformation of 60%, two-way upsetting and drawing forging at 770℃ for 2 times, deformation of 57%, a total of 4 times, 100% grinding between each time;

[0051] (6) Billet cold charging furnace, heating to 820°C in a box-type resistance furnace, keeping warm for 3 hours, and air cooling;

[0052] (7) Two-way upsetting forging at 710℃, with a deformation of 51%;

[0053] (8) Forging the finished product at 740°C, forming it in one step, the forging rod size is Φ140mm;

[0054] (9) Solution aging is carried out in a box-type resistance furnace, the solution temperature is 760°C, the temperature is kept for 1 hour, and the aging temperature is 550°C, the temperature is kept for 4 hours;

[0055] (10) The finished product size of the polished rod is Φ120mm, and the A-level flaw detection is passed. Sample 2 is obtained after passing the test.

[0056] Comparative Example 1

[0057] Preparation of finished bar Φ160mm. The preparation process is as follows:

[0058] (1) The ingredients are prepared in the following proportions, wherein the ingredients of TB10 are: Mo: 4.9wt%; V: 5.1wt%; Cr: 1.9wt%; Al: 3.1wt%; Fe: 0.09wt%; C: 0.006wt%; N: 0.008wt%; H: 0.0011wt%; O: 0.08wt%; the balance is titanium;

[0059] (2) MoAl (Mo content is 72wt%), VAl (V content is 81wt%) master alloy, pure Cr and Al foil, according to the above-mentioned proportion, are mixed evenly with sponge titanium and pressed into electrodes; Φ630mm ingots are obtained by three smelting in a vacuum consumable electric furnace;

[0060] (3) Forging at 1030°C to obtain a square billet with a cross section of 500×500 mm;

[0061] (4) After the billet is ground and cut, it is forged by three-way upsetting and drawing at 900℃ for 4 times, with a deformation of 67%, and 100% grinding between each time;

[0062] (5) Two-way upsetting forging at 800℃, 770℃ and 750℃, respectively, with deformation of 61%, 57% and 55% respectively; a total of 3 times, with 100% grinding between each time;

[0063] (6) Billet cold charging furnace: heat to 840°C in a box-type resistance furnace, keep warm for 2.5 hours, and air cool;

[0064] (7) Two-way upsetting forging at 730°C, with a deformation of 53%;

[0065] (8) Forging the finished product at 720℃, forming in one step, the forging rod size is Φ180mm;

[0066] (9) Solution aging was carried out in a box-type resistance furnace at a solution temperature of 740°C for 2 hours and an aging temperature of 510°C for 6 hours;

[0067] (10) The finished product size of the polished rod is Φ160mm, and the A-level flaw detection fails, and sample 3 is obtained.

[0068] Comparative Example 2

[0069] Preparation of finished bar Φ120mm. The preparation process is as follows:

[0070] (1) The ingredients are prepared in the following proportions, wherein the ingredients of TB10 are: Mo: 5.1wt%; V: 5.0wt%; Cr: 2.1wt%; Al: 3.0wt%; Fe: 0.08wt%; C: 0.006wt%; N: 0.008wt%; H: 0.0011wt%; O: 0.06wt%; the balance is titanium;

[0071] (2) MoAl (Mo content is 72wt%), VAl (V content is 81wt%) master alloy, pure Cr and Al foil, according to the above-mentioned proportion, are mixed evenly with sponge titanium and pressed into electrodes; Φ580mm ingots are obtained by three smelting in a vacuum consumable electric furnace;

[0072] (3) Forging at 990°C to obtain a square billet with a cross section of 500×500 mm;

[0073] (4) After the billet is ground and cut, it is subjected to three-way upsetting forging at 940℃ and 900℃ for 2 times, with deformations of 69% and 65% respectively, and upsetting forging at 860℃ for 3 times, with deformation of 63%; a total of 7 times, with 100% grinding between each time;

[0074] (5) Two-way upsetting and drawing forging at 770℃ for 2 times, deformation of 57%, and 100% grinding between each time;

[0075] (6) Billet cold charging furnace, heating to 820°C in a box-type resistance furnace, keeping warm for 3 hours, and air cooling;

[0076] (7) Two-way upsetting forging at 710℃, with a deformation of 51%;

[0077] (8) Forging the finished product at 740°C, forming it in one step, the forging rod size is Φ140mm;

[0078] (9) Solution aging is carried out in a box-type resistance furnace, the solution temperature is 760°C, the temperature is kept for 1 hour, and the aging temperature is 550°C, the temperature is kept for 4 hours;

[0079] (10) The finished product size of the polished rod is Φ120mm and it passes the A-level flaw detection, and sample 4 is obtained.

[0080] Comparative Example 3

[0081] Preparation of finished bar Φ120mm. The preparation process is as follows:

[0082] (1) The ingredients are prepared in the following proportions, wherein the ingredients of TB10 are: Mo: 5.1wt%; V: 5.0wt%; Cr: 2.1wt%; Al: 3.0wt%; Fe: 0.08wt%; C: 0.006wt%; N: 0.008wt%; H: 0.0011wt%; O: 0.06wt%; the balance is titanium;

[0083] (2) MoAl (Mo content is 72wt%), VAl (V content is 81wt%) master alloy, pure Cr and Al foil, according to the above-mentioned proportion, are mixed evenly with sponge titanium and pressed into electrodes; Φ580mm ingots are obtained by three smelting in a vacuum consumable electric furnace;

[0084] (3) Forging at 990°C to obtain a square billet with a cross section of 500×500 mm;

[0085] (4) After the billet is ground and cut, it is subjected to three-way upsetting forging at 940℃ and 900℃ for 2 times, with deformations of 69% and 65% respectively, and upsetting forging at 860℃ for 3 times, with deformation of 63%; a total of 7 times, with 100% grinding between each time;

[0086] (5) Two-way upsetting and drawing forging at 800℃ for 2 times, deformation of 60%, two-way upsetting and drawing forging at 770℃ for 2 times, deformation of 57%, a total of 4 times, 100% grinding between each time;

[0087] (6) Billet cold charging furnace, heating to 820°C in a box-type resistance furnace, keeping warm for 3 hours, and air cooling;

[0088] (7) Two-way upsetting forging at 710℃, with a deformation of 42%;

[0089] (8) Forging the finished product at 740°C, forming it in one step, the forging rod size is Φ140mm;

[0090] (9) Solution aging is carried out in a box-type resistance furnace, the solution temperature is 760°C, the temperature is kept for 1 hour, and the aging temperature is 550°C, the temperature is kept for 4 hours;

[0091] (10) The finished product size of the polished rod is Φ120mm and it passes the A-level flaw detection, and sample 5 is obtained.

[0092] Table 1

[0093] Sample 1 Sample 2 Sample 3 Sample 4 Sample 5 <![CDATA[R m / MPa]]> 1240 1270 1260 1250 1230 <![CDATA[R p0.2 / MPa]]> 1150 1190 1180 1180 1150 A / ％ 13.0 16.0 9.0 11.0 10.0 Z / ％ 44 59 31 49 44

[0094] Samples 1, 2, 3, 4 and 5 were processed into standard bar tensile specimens. The test was completed on an AG50KNE ​​testing machine. The room temperature mechanical properties are shown in Table 1. By comparison, it can be seen that the tensile strength R mAll are greater than 1200MPa, and the yield strength R p0.2 Greater than 1100MPa, however, both Sample 1 and Sample 2 are forged according to the processing method of the present invention, and their elongation after fracture (A%) is greater than 12%, and their cross-sectional shrinkage (Z%) is greater than 40%. However, the forging times of Sample 3 in step (4) are less than 6, the forging times of Sample 4 in step (5) are less than 3, and the forging deformation of Sample 5 in step (7) is less than 50%, all of which result in the elongation after fracture failing to meet the requirement of 12%. Among them, Sample 3 did not pass the A-level flaw detection and its cross-sectional shrinkage was less than 40%.

[0095] The results show that the tensile strength (R m ) is not less than 1200MPa, yield strength (R p0.2 ) is not less than 1100MPa, the elongation after fracture is not less than 12%, and the cross-sectional shrinkage is not less than 40%. The titanium alloy forging rod has high tensile strength and excellent plasticity, and can be used in aviation, aerospace, petroleum, ships and chemical industries.

[0096] Obviously, the above-mentioned embodiments of the present invention are merely examples for clearly explaining the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is impossible to list all the embodiments here. Any obvious changes or modifications derived from the technical solution of the present invention are still within the scope of protection of the present invention.

Claims

1. A method for processing a near-β-type titanium alloy TB10 forging rod, comprising the following steps: (1) The near-β titanium alloy TB10 is formulated in the following proportions: Mo: 4.5~5.5wt%, V: 4.5~5.5wt%, Cr: 1.5~2.5wt%, Al: 2.5~3.5wt%, Fe: <0.30wt%, C: <0.05wt%, N: <0.04wt%, H: <0.015wt%, O: <0.15wt%, and the balance is titanium; (2) Pressing the ingredients into electrodes, and melting them three times in a vacuum consumable electric furnace to obtain ingots; (3) Forging at 980-1030°C to obtain a square billet; (4) After the billet is ground and cut, it is subjected to three-way upsetting forging at 930-950℃, 890-910℃, and 850-870℃ for 2 times, with deformations of 69-71%, 65-67%, and 63-65%, respectively, for a total of 6 times, with 100% grinding between each time; (5) Two-way upsetting forging at 790-800℃, 770-780℃, and 750-760℃, with deformations of 59-61%, 57-58%, and 55-56% respectively; a total of 3 fires, with 100% grinding between each fire; (6) Keep the temperature in a box-type resistance furnace for no less than 2 hours at a temperature of 800-850°C. Furnace cooling or air cooling; (7) Two-way upsetting and drawing forging at 700-750°C, with the deformation of each pass not less than 50%; (8) The finished product is forged at 700-750℃, formed in one step, and tempering is not allowed; (9) Solution aging is carried out in a box-type resistance furnace at a solution temperature of 700-800°C for 0.5-3 hours. When the aging temperature is 400-650℃, keep warm for 2-24 hours; (10) Polishing rod, flaw detection, and the finished product is obtained after passing the test.

2. The method for processing a nearly β-type titanium alloy TB10 forged rod according to claim 1, characterized in that: In step (2), the ingot diameter is Φ550-650mm.

3. The method for processing a near-β-type titanium alloy TB10 forged rod according to claim 1, characterized in that: In step (6), the billet is cold charged into a furnace, heated to 820-840°C in a box-type resistance furnace, kept at this temperature for 2.5-3 hours, and then air-cooled.

4. The method for processing a near-β-type titanium alloy TB10 forged rod according to claim 1, characterized in that: In step (7), two-way upsetting forging is performed at 710-730° C., and the deformation amount is 51-53%.

5. The method for processing a near-β-type titanium alloy TB10 forged rod according to claim 1, characterized in that: In step (8), the finished product is forged at 720-740° C., formed in one step, and the forged rod size is Φ140-180 mm.

6. The method for processing a near-β-type titanium alloy TB10 forged rod according to claim 1, characterized in that: In step (9), the solution temperature is 740-760°C, and the temperature is kept for 1-2 hours. The aging temperature is 500-550°C, and the temperature is kept for 4-6 hours.

7. The method for processing a nearly β-type titanium alloy TB10 forged rod according to claim 1, characterized in that: In step (10), the finished product size is greater than Φ100 mm.

8. The method for processing a nearly β-type titanium alloy TB10 forged rod according to claim 1, characterized in that: In step (10), the finished product size is Φ120-160 mm.

9. A nearly β-type titanium alloy TB10 forged rod, characterized in that: The method is prepared by the processing method described in any one of claims 1 to 8.