High-impact-energy TA5 alloy forged ring and preparation method thereof

Abstract

This invention discloses a high-impact-energy TA5 alloy forged ring and its preparation method, relating to the field of titanium alloy processing technology. The method includes: performing double-brush forging on a TA5 alloy ingot to obtain a target forged billet; heating the target forged billet to obtain a forged blank; forging the forged blank to obtain a ring blank; and performing double annealing on the ring blank to obtain a TA5 alloy forged ring. The method of this invention effectively avoids internal hole cracking of the ring blank during forging, significantly reducing the machining allowance of the finished ring and significantly improving the yield rate in the ring manufacturing process, thus effectively reducing the overall manufacturing cost of forged rings. Simultaneously, the heat treatment method for the TA5 alloy ring of this invention effectively improves the impact energy of the ring. The impact energy of the ring after the double annealing treatment of this invention is 1.5 to 2.0 times higher than that of the ring after traditional annealing treatment.

Description

Technical Field

[0001] This invention relates to the field of titanium alloy processing technology, and in particular to a high-impact-energy TA5 alloy forging ring and its preparation method. Background Technology

[0002] TA5 alloy is a medium-strength alpha-type titanium alloy, typically containing about 4% Al and trace amounts of Bo. Al provides solid solution strengthening, while Bo refines the alloy's microstructure. TA5 alloy exhibits good weldability and corrosion resistance, and is commonly manufactured into forgings, bars, plates, and wires. It is widely used in structural components for marine environments and in corrosion-resistant components in the chemical industry.

[0003] Although TA5, a medium-strength titanium alloy, has better plasticity than other high-strength titanium alloys, titanium is still a difficult-to-deform metal. When forging TA5 alloy rings using traditional methods, the rings are prone to internal cracking, leading to reduced yield and increased machining, thus increasing manufacturing costs. Traditional annealing treatment can also easily result in insufficient impact energy in TA5 alloy rings. Summary of the Invention

[0004] The purpose of this invention is to provide a high-impact-energy TA5 alloy forged ring and its preparation method, which improves the yield of TA5 rings, reduces machining allowance, and significantly increases the impact energy of the TA5 alloy forged ring. Furthermore, the method is simple to operate and suitable for industrial production. To achieve the above objectives, this invention provides the following technical solution:

[0005] According to one aspect of this disclosure, a method for preparing a high-impact-energy TA5 alloy forged ring is provided, the method comprising the following steps:

[0006] The TA5 alloy ingot was subjected to double forging to obtain the target forged billet.

[0007] The target forging billet is heated to obtain a forging billet;

[0008] The forging blank is forged to obtain a ring blank;

[0009] The ring blank was subjected to double annealing to obtain a TA5 alloy forged ring.

[0010] Furthermore, the process of performing double-brush forging on the TA5 alloy ingot to obtain the target forged billet includes:

[0011] The TA5 alloy ingot was subjected to the first forging process to obtain the first forged billet.

[0012] The first forged billet is subjected to a second forging process to obtain the target forged billet.

[0013] Furthermore, the conditions for the first forging of the billet include:

[0014] After heating the TA5 alloy ingot to 1000–1200℃ and holding it at that temperature for a first set time, it is removed from the furnace and forged in 1–2 passes, with each pass involving 2–3 upsetting and drawing processes to obtain the first modified forging billet; among which…

[0015] The deformation rate is 0.005–0.04 s. -1 ;

[0016] The upsetting pressure is ≥40%;

[0017] The temperature of the first forged billet is ≥1000℃.

[0018] Furthermore, the conditions for the second forging process include:

[0019] The first forging billet is heated to 920-970℃ and held for a second set time. It is then removed from the furnace and forged in 1-2 passes, with each pass involving 2-3 upsetting and drawing processes to obtain the target forging billet.

[0020] The deformation rate is 0.005–0.04 s. -1 ;

[0021] The upsetting pressure is ≥35%;

[0022] The temperature of the target forged billet is ≥850℃.

[0023] Further, the heating of the target forging billet to obtain a forging billet includes:

[0024] The target forging billet is heated to 920-970℃ and held for a third set time. After being removed from the furnace, it is deformed to the target size to obtain the forging billet.

[0025] The deformation rate is 0.005–0.04 s. -1 The amount of deformation compression or diameter reduction is ≥33%;

[0026] The temperature of the forging billet is ≥850℃.

[0027] Further, the forging of the forging billet to obtain a ring billet includes:

[0028] The forging billet is heated to 30–70°C below the β phase transformation point and held for a fourth set time. After being removed from the furnace, it is upset to the height tolerance range required for the target forged ring. Then, it is punched, and subsequently enlarged using a hob to the inner and outer diameter tolerance range required for the target forged ring. Finally, it is shaped to obtain the ring billet.

[0029] The upsetting deformation rate is 0.005–0.04 s. -1 The upsetting pressure is 35% to 45%;

[0030] The diameter of the punch used for punching is not less than 1 / 3 of the diameter of the forging billet.

[0031] Furthermore, the process of subjecting the ring blank to double annealing to obtain a TA5 alloy forged ring includes:

[0032] The ring blank is subjected to double annealing at 30-200°C below the β phase transformation point. The holding temperature for the first annealing is 30-50°C below the phase transformation point, and the holding temperature for the second annealing is 100-200°C below the phase transformation point. The holding time is set for five hours, and the ring blank is cooled to room temperature by air cooling after being removed from the furnace to obtain a TA5 alloy forged ring.

[0033] According to one aspect of this disclosure, a high-impact-energy TA5 alloy forged ring is provided, prepared by the above-described method, wherein the composition and mass percentage of the TA5 alloy forged ring are as follows:

[0034] Al: 3.8–4.7%; B: 0.001–0.005%; Fe ≤ 0.3%; O ≤ 0.15%; balance is Ti and other unavoidable impurity elements.

[0035] Furthermore, the mechanical properties of the TA5 alloy forged ring include:

[0036] Tensile strength ≥710MPa; Yield strength ≥636MPa; Elongation after fracture ≥12.5%; Reduction of area ≥37.0%; Impact energy ≥51.2J.

[0037] The technical effects and advantages of this invention are as follows:

[0038] First, the TA5 alloy ring forging method of the present invention effectively avoids the cracking of the inner hole of the ring blank during the forging process. On the one hand, it significantly reduces the machining allowance of the finished ring, and on the other hand, it significantly improves the yield of the ring manufacturing process. Overall, it effectively reduces the preparation cost of forged rings.

[0039] Secondly, the heat treatment method for TA5 alloy rings of the present invention effectively improves the impact energy of the rings. The impact energy of the rings after the double annealing treatment of the present invention is 1.5 to 2.0 times higher than that of the rings after traditional annealing treatment.

[0040] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0041] Figure 1 This is a flowchart of a method for preparing a high-impact-energy TA5 alloy forged ring according to the present invention;

[0042] Figure 2 This is an image of the forged ring prepared in Example 1 of this invention after its ends have been sawn flat.

[0043] Figure 3 The image shows the microstructure of the heat-treated TA5 alloy forged ring prepared in Example 1 of this invention.

[0044] Figure 4 This is an image of the forged ring prepared in Example 2 of the present invention after its ends have been sawn flat.

[0045] Figure 5 The image shows the microstructure of the heat-treated TA5 alloy forged ring prepared in Example 2 of this invention.

[0046] Figure 6 This is an image of the forged ring prepared in the comparative example of this invention after its ends have been sawn flat.

[0047] Figure 7 This is a microstructure image of the heat-treated TA5 alloy forged ring prepared in the comparative example of this invention. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] To address the shortcomings of existing technologies, this invention discloses a method for preparing a high-impact-energy TA5 alloy forged ring. Figure 1 This is a flowchart of a method for preparing a high-impact-energy TA5 alloy forged ring according to the present invention, as shown below. Figure 1 As shown, the method includes the following steps:

[0050] S1. Double-forging of TA5 alloy ingot to obtain the target forged billet;

[0051] S2. Heat the target forging billet to obtain a forging billet;

[0052] S3. Forging the forging billet to obtain a ring billet;

[0053] S4. The ring blank is subjected to double annealing treatment to obtain a TA5 alloy forged ring.

[0054] In step S1 of this invention, the TA5 alloy ingot undergoes a first forging process, including: heating the TA5 alloy ingot to 1000-1200°C and holding it at that temperature for a first set time; then removing it from the furnace and completing 1-2 forging passes, with each pass involving 2-3 upsetting and drawing passes to obtain the first forged billet; wherein the deformation rate is 0.005-0.04 s. -1 The upsetting pressure is ≥40%, and the temperature of the first forged billet is ≥1000℃.

[0055] The first modified forging billet undergoes a second forging process, including: heating the first modified forging billet to 920-970℃ and holding it at that temperature for a second set time; then removing it from the furnace and completing 1-2 forging passes, with each pass involving 2-3 upsetting and drawing forging passes, to obtain the target modified forging billet; wherein the deformation rate is 0.005-0.04 s. -1 The upsetting pressure is ≥35%, and the temperature of the target forging billet is ≥850℃.

[0056] In step S2 of this invention, heating the target forging billet includes: heating the target forging billet to 920-970°C and holding it at that temperature for a third set time; then deforming it to the target size after removing it from the furnace to obtain the forging billet; wherein the deformation rate is 0.005-0.04 s. -1 The deformation amount or diameter reduction is ≥33%, and the temperature of the forging billet is ≥850℃.

[0057] In step S3 of this invention, forging the forging billet includes: heating the forging billet to 30-70°C below the β phase transformation point and holding it at that temperature for a fourth set time; after removing it from the furnace, upsetting it to the height tolerance range required for the target forged ring; then punching it; then enlarging the hole using a hoop to the inner and outer diameter tolerance range required for the target forged ring; and finally shaping it to obtain a ring billet; wherein the upsetting deformation rate is 0.005-0.04s. -1 The upsetting pressure is 35% to 45%; the diameter of the punch for punching is not less than 1 / 3 of the diameter of the forging billet.

[0058] In step S4 of the present invention, the ring blank is subjected to double annealing treatment, including: the ring blank is subjected to double annealing treatment at 30 to 200°C below the β phase transformation point, the holding temperature of the first annealing is 30 to 50°C below the phase transformation point, the holding temperature of the second annealing is 100 to 200°C below the phase transformation point, the holding time is set for a fifth time, and the ring blank is cooled to room temperature by air cooling after being removed from the furnace to obtain a TA5 alloy forged ring.

[0059] It should be noted that in steps S1 to S3 of the present invention, the first, second, third, and fourth set times of heat preservation are all calculated based on: heat preservation time t1 = heating coefficient k1 × characteristic dimension d1, where the heating coefficient k1 is between 0.3 and 0.7 minutes / mm, and the characteristic dimension d1 is the minimum dimension of the geometric contour of the ingot or forging billet. In step S4 of the present invention, the fifth set time is calculated based on: heat preservation time t2 = heating coefficient k2 × characteristic dimension d2, where the heating coefficient k2 is between 0.8 and 1.0 minutes / mm, and the characteristic dimension d2 is the minimum dimension of the geometric contour of the ring billet.

[0060] Based on the above method, the present invention also discloses a high impact energy TA5 alloy forging ring, wherein the composition and mass percentage of the TA5 alloy forging ring are as follows:

[0061] Al: 3.8–4.7%; B: 0.001–0.005%; Fe ≤ 0.3%; O ≤ 0.15%; balance is Ti and other unavoidable impurity elements.

[0062] Furthermore, the mechanical properties of the TA5 alloy forged ring include:

[0063] Tensile strength ≥710MPa; Yield strength ≥636MPa; Elongation after fracture ≥12.5%; Reduction of area ≥37.0%; Impact energy ≥51.2J.

[0064] Example 1:

[0065] The TA5 alloy ingot with a diameter of 750mm was used. Its chemical composition and mass percentage were: [Al] = 4.3%, [B] = 0.005%, [Fe] ≤ 0.19%, [O] ≤ 0.12%, with the balance being Ti and other unavoidable impurity elements. The calculated β phase transformation point was 1001.5℃.

[0066] Step S1, Ingot Forging and Re-forging: Heat the TA5 alloy ingot to 1150℃, hold for 7.5 hours, and then remove it from the furnace to complete the two-stage upsetting and drawing forging deformation in one heat, with a deformation rate of approximately 0.007s. -1 Each upsetting reduction is approximately 40%, resulting in a first forged billet temperature ≥1000℃. This first forged billet is then heated to 950℃ and held for 7.5 hours. After completing one heat cycle of upsetting and drawing forging, it is deformed into a target forged billet with a diameter of Φ500mm, at a deformation rate of 0.01s. -1 Each upsetting pressure is approximately 40%, and the target forging billet temperature is ≥850℃.

[0067] Step S2, forging billet preparation: The Φ500mm target forging billet obtained in step S1 is heated to 950℃ and held for 5 hours. After being removed from the furnace, it is drawn and deformed to Φ300mm, thus completing the forging billet preparation; the deformation rate is 0.02s. -1 The diameter reduction is 40%, and the temperature of the forging billet is ≥850℃; the forging billet is sawn into small-sized forging billets with a diameter of Φ300mm×470mm.

[0068] Step S3, Ring Billet Forging: The small-diameter forging billet from Step S2 is heated to 950℃ and held for 3 hours. After being removed from the furnace, it is upset to a height of 300mm, then punched, and then enlarged using a hoop to an outer diameter of Φ400mm × inner diameter of Φ240mm. Finally, it is hot-pressed to flatten the ends and form a ring billet; wherein, the upsetting deformation rate is 0.024s. -1 The upsetting pressure is 36%; the punch diameter for punching is Φ150mm.

[0069] Step S4, heat treatment: The ring blank is held at 950℃ for 1 hour and then air-cooled to room temperature. Then the ring blank is held at 700℃ for 1 hour and then air-cooled to room temperature to obtain TA5 alloy forged ring.

[0070] Figure 2 The image shown is of the forged ring prepared in Example 1 of this invention after its ends have been sawn flat. Figure 2 As shown, there are no visible cracks on either the inner or outer surfaces of the forged ring.

[0071] Figure 3 The image shows the microstructure of the heat-treated TA5 alloy forged ring prepared in Example 1 of this invention. Figure 3 As shown, the microstructure of the forging ring consists of equiaxed α-phase grains of 10–50 μm.

[0072] The TA5 alloy forged ring prepared in Example 1 was subjected to mechanical property testing at room temperature. The results are shown in Table 1 below. It can be seen that the tensile strength of the forged ring is ≥710MPa, the yield strength is ≥644MPa, the elongation after fracture is ≥12.5%, the reduction of area is ≥37%, and the impact energy is 64.5~71.3J. The above shows that the forged ring in Example 1 has both high strength and high impact energy.

[0073] Table 1. Mechanical properties of the TA5 alloy forged rings prepared in Example 1 at room temperature.

[0074]

[0075] Example 2:

[0076] The same TA5 alloy ingot blank as in Example 1 was used.

[0077] Step S1, Ingot Forging and Re-forging: Heat the TA5 alloy ingot to 1180℃ and hold for 7.5 hours. After removing it from the furnace, complete the two upsetting and drawing forging deformation in one heat, with a deformation rate of 0.007s. -1 Each upsetting reduction is 40%, and the temperature of the first forging billet is ≥1000℃. Then, the first forging billet is heated to 950℃ and held for 7.5 hours. After one furnace pass, the billet undergoes two upsetting and drawing forging processes in one pass, resulting in a target forging billet with a diameter of Φ500mm. The deformation rate is 0.01s. -1 Each upsetting pressure is 40%, and the target forging billet temperature is ≥850℃.

[0078] Step S2, forging billet preparation: The Φ500mm target forging billet obtained in step S1 is heated to 960℃ and held for 5 hours. After being taken out of the furnace, it is drawn and deformed to Φ300mm, thus completing the forging billet preparation. The deformation rate is 0.02s. -1 The diameter reduction is 40%, and the forging temperature is ≥850℃. The forging billet is then sawn into small-sized forging billets with a diameter of Φ300mm×380mm.

[0079] Step S3, Ring Billet Forging: The small-diameter forging billet from Step S2 is heated to 960℃ and held for 3 hours. After being removed from the furnace, it is upset to a height of 245mm, then punched, and then enlarged using a hoop to an outer diameter of Φ400mm × inner diameter of Φ270mm. Finally, it is hot-pressed to flatten the ends and form a ring billet. The upsetting deformation rate is 0.024s. -1 The upsetting pressure is 35.5%; the punch diameter for punching is Φ150mm.

[0080] Step S4, heat treatment: The ring billet is held at 950℃ for 1 hour and then air-cooled to room temperature. Then the ring billet is held at 800℃ for 1 hour and then air-cooled to room temperature to obtain TA5 alloy forged ring.

[0081] Figure 4 The image shown is of the forged ring prepared in Example 2 of this invention after its ends have been sawn flat. Figure 4 As shown, there are no visible cracks on either the inner or outer surfaces of the forged ring.

[0082] Figure 5 The image shows the microstructure of the heat-treated TA5 alloy forged ring prepared in Example 2 of this invention. Figure 5 As shown, the microstructure of the forging ring consists of equiaxed α-phase grains of 10–50 μm.

[0083] The TA5 alloy forged ring prepared in Example 2 was subjected to mechanical property tests at room temperature. The results are shown in Table 2 below. It can be seen that the forged ring has a tensile strength ≥722 MPa, a yield strength ≥636 MPa, an elongation after fracture ≥14.0%, a reduction of area ≥38%, and an impact energy of 51.2–59.9 J. The forged ring in Example 2 possesses both high strength and high impact energy.

[0084] Table 2 shows the mechanical properties of the TA5 alloy forged rings prepared in Example 2 at room temperature.

[0085]

[0086] Comparative example:

[0087] The same TA5 alloy ingot blank as in Example 1 was used.

[0088] Step S1, Ingot Forging and Re-forging: Heat the TA5 alloy ingot to 1150℃ and hold for 7.5 hours. After removing it from the furnace, complete the two-stage upsetting and drawing forging deformation in one heat. The deformation rate is approximately 0.007s. -1 Each upsetting reduction is approximately 40%, resulting in a first forged billet temperature ≥1000℃. This first forged billet is then heated to 950℃ and held for 7.5 hours. After completing one round of upsetting and drawing forging deformation, it is deformed into a target forged billet with a diameter of Φ500mm, at a deformation rate of approximately 0.01s. -1 Each upsetting pressure is approximately 40%, and the target forging billet temperature is ≥850℃.

[0089] Step S2, forging billet preparation: The Φ500mm target forging billet obtained in step S1 is heated to 960℃ and held for 5 hours. After being removed from the furnace, it is drawn and deformed to Φ300mm, thus completing the forging billet preparation. The deformation rate is approximately 0.02s. -1 The diameter reduction is approximately 40%, and the forging temperature is ≥850℃. The forging billet is then sawn into small-sized forging billets with a diameter of Φ300mm × 610mm.

[0090] Step S3, Ring Billet Forging: The small-diameter forging billet from Step S2 is heated to 960℃ and held for 3 hours. After being removed from the furnace, it is upset to a height of 400mm, then punched, and immediately drawn to a height of 580mm. The hole is then enlarged using a hoop to an outer diameter of Φ400mm × an inner diameter of Φ240mm, and finally hot-pressed to flatten the ends to obtain the ring billet. The upsetting deformation rate is approximately 0.011s. -1 The downward pressure is about 35%, and the diameter of the punch for punching is Φ150mm.

[0091] Step S4, Heat Treatment: The ring blank is held at 700℃ for 1 hour and then air-cooled to room temperature to obtain a TA5 alloy forged ring. There are no visible cracks on the outer surface of the forged ring, but obvious surface cracks appear on the inner surface.

[0092] Figure 6 The image shown is of the forged ring prepared in the comparative example of this invention after its ends have been sawn flat. Figure 6 As shown, cracking of the inner surface of the forged ring in the comparative example leads to an increase in the machining amount of the forged ring and a decrease in the yield.

[0093] Figure 7 Images showing the microstructure of the heat-treated TA5 alloy forged ring prepared in the comparative example of this invention, such as... Figure 7 As shown, the microstructure of the forging ring consists of equiaxed α-phase grains of 20–50 μm, and twins exist in the α-phase grains.

[0094] The TA5 alloy forged rings prepared in the comparative example were subjected to mechanical property tests at room temperature. The results are shown in Table 3 below. It can be seen that the tensile strength of the forged rings is ≥737 MPa, the yield strength is ≥685 MPa, the elongation after fracture is ≥11.0%, the reduction of area is ≥34%, and the impact energy is 33.0–34.8 J. The strength of the forged rings in the comparative example is higher than that of the forged rings in Examples 1 and 2, but the impact energy of the forged rings in the comparative example is significantly lower than that of the forged rings in Examples 1 and 2.

[0095] Table 3 shows the mechanical properties of the TA5 alloy forged rings prepared in the comparative examples at room temperature.

[0096]

[0097] The forging ring preparation method provided by this invention improves the yield of TA5 rings, reduces machining allowance, and significantly enhances the impact energy of TA5 rings. Furthermore, the method is simple to operate and suitable for industrial production. Based on the application prospects of TA5 alloy in marine engineering and recent customer inquiries, a conservative estimate suggests that 24 TA5 rings weighing 100kg each will be produced annually. With a unit price of 200 yuan / kg, the sales revenue of TA5 forged rings after implementation could reach 480,000 yuan per year. Moreover, with the increasing demand in the marine engineering field, the market demand for TA5 rings will continue to rise.

[0098] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A method of making a high-impact WTA5 alloy forging ring, characterized by, The method includes the following steps: The TA5 alloy ingot was subjected to double forging to obtain the target forged billet. The target forging billet is heated to obtain a forging billet; The forging blank is forged to obtain a ring blank; The ring blank was subjected to double annealing to obtain a TA5 alloy forged ring; The process of double-brush forging of TA5 alloy ingots to obtain the target forged billet includes: The TA5 alloy ingot was subjected to the first forging process to obtain the first forged billet. The first forged billet is subjected to a second forging process to obtain the target forged billet. The conditions for the first forging and re-forging include: After heating the TA5 alloy ingot to 1000~1200℃ and holding it at that temperature for a first set time, it is removed from the furnace and forged in 1-2 passes, with each pass involving 2-3 upsetting and drawing processes to obtain the first modified forging billet; among which... The rate of deformation is 0.005 to 0.04 s -1 ; The upsetting pressure is ≥40%; The temperature of the first modified forging billet is ≥1000℃; The conditions for the second forging process include: The first forging billet is heated to 920~970℃ and held for a second set time. It is then removed from the furnace and forged in 1-2 passes, with each pass involving 2-3 upsetting and drawing processes to obtain the target forging billet. The rate of deformation is 0.005 to 0.04 s -1 ; The upsetting pressure is ≥35%; The temperature of the target forged billet is ≥850℃; The first and second set insulation times are calculated based on the following: insulation time t1 = heating coefficient k1 × characteristic dimension d1. The ring blank is subjected to double annealing treatment to obtain a TA5 alloy forged ring, comprising: The ring blank is subjected to double annealing at 30~200℃ below the β phase transformation point. The holding temperature of the first annealing is 30~50℃ below the phase transformation point, and the holding temperature of the second annealing is 100~200℃ below the phase transformation point. The holding time is set for five times, and the ring blank is cooled to room temperature by air cooling after being removed from the furnace to obtain TA5 alloy forged ring. The fifth setting time for heat preservation is based on the following: heat preservation time t2 = heating coefficient k2 × characteristic dimension d2.

2. The method of producing a high-impact-ta5 alloy forging ring according to claim 1, wherein Heating the target forging billet to obtain a forging billet includes: The target forging billet is heated to 920-970℃ and held for a third set time. After being removed from the furnace, it is deformed to the target size to obtain the forging billet. The rate of deformation is 0.005-0.04 s -1 The amount of deformation or the amount of reduction is ≥ 33%. The temperature of the forging billet is ≥850℃; The third set time for heat preservation is based on the following: heat preservation time t1 = heating coefficient k1 × characteristic dimension d1.

3. The method of producing a high-impact-ta5 alloy forging ring according to claim 1, wherein The forging blank is forged to obtain a ring blank, comprising: The forging billet is heated to 30-70°C below the β phase transformation point and held for a fourth set time. After being removed from the furnace, it is upset to the height tolerance range required for the target forged ring. Then, it is punched, and subsequently enlarged using a hob to the inner and outer diameter tolerance range required for the target forged ring. Finally, it is shaped to obtain the ring billet. The upsetting deformation rate is 0.005-0.04 s -1 The upsetting reduction is 35%-45%. The diameter of the punch for punching is not less than 1 / 3 of the diameter of the forging billet; The fourth setting time for heat preservation is based on the following: heat preservation time t1 = heating coefficient k1 × characteristic dimension d1.

4. A high-impact WTA5 alloy forging ring prepared by the method of any one of claims 1-3, characterized in that, The composition and mass percentage of the TA5 alloy forged ring are as follows: Al：3.8~4.7%； B: 0.001~0.005%; Fe≤0.3%; O≤0.15%; balance is Ti and other unavoidable impurity elements.

5. A high impact energy TA5 alloy forged ring according to claim 4, characterized in that, The mechanical properties of the TA5 alloy forged ring include: Tensile strength ≥710MPa; Yield strength ≥636MPa; Elongation after fracture ≥12.5%; Reduction of area ≥37.0%; Impact energy ≥51.2J.

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