TC32 titanium alloy general forging blank manufacturing process

Abstract

The invention belongs to the technical field of titanium alloy processing, and relates to a TC32 titanium alloy general forging blank making process, which comprises the following steps of: 1, heating and preserving heat for a bar or a forging blank by adopting a resistance furnace at the heating temperature T of more than or equal to 810.0 DEG C and less than or equal to 890.0 DEG C, and preserving heat for 1.0-7.5 hours; the upper hammer anvil single hammer rolling reduction epsilon single hammer = (H0-H) / H0, the epsilon single hammer is larger than or equal to 0 and smaller than or equal to 25.0%, H0 is the original height before blank pressing, and H is the height after blank pressing; the average reduction rate V of the upper hammer anvil is more than or equal to 0.01 s <-1 > and less than or equal to 0.50 s <-1 >; the single-hammer feeding amount L of the blank is equal to eta B, B is the width of the upper hammer anvil, eta is a feeding coefficient, and eta is larger than or equal to 0 and smaller than or equal to 1; and 3, after the forging step is finished, air cooling or hot material returning to the furnace for heat preservation is performed, and next heating forging is continuously performed. The forging technology solves the problem that in the prior art, the forging technology is poor in universality, the forging technology is suitable for forging and blank making of TC32 multi-type tissue forgings, the problems of uneven tissue, poor performance consistency, high forging cost and the like caused by extensive technological parameter control are avoided, and the forging stability and the forming efficiency are improved.

Description

Technical Field

[0001] This invention belongs to the field of titanium alloy processing technology and relates to a general forging and blanking process for TC32 titanium alloy. Background Technology

[0002] Titanium alloys are widely used in high-end fields such as aerospace, shipbuilding, and chemical equipment due to their high specific strength, excellent corrosion resistance, and good high-temperature performance. TC32 titanium alloy is a medium-to-high strength titanium alloy with excellent comprehensive performance. It is commonly used in the aerospace field to manufacture landing gear outer cylinders, joints, frame beams, as well as key load-bearing components such as engine fans, compressor discs, blades, and casings. Due to differences in design requirements and loads, different requirements are placed on the microstructure of these components. For example, if high damage tolerance is the primary design goal, lamellar forgings are preferable; if high plasticity and excellent impact toughness are desired, bimodal forgings are more suitable; if a balance of various properties is required to achieve high comprehensive performance, basket-weave forgings can be selected.

[0003] Forging blank preparation is a crucial preparatory process before the final forming of titanium alloy forgings. Its purpose is to further process bars or forging blanks with uniform microstructure and properties into pre-formed blanks with suitable shape and size and equally uniform internal microstructure through forging, laying the foundation for subsequent die forging and heat treatment. The rationality of the blank preparation process directly determines the microstructure, streamline distribution, and forming quality of the pre-formed blank, and is a technical prerequisite for obtaining high-performance forgings.

[0004] To meet the specific mechanical performance requirements of different aircraft and engine parts, TC32 titanium alloy forgings with dual-state, lamellar, and basket-like microstructures can be manufactured according to design requirements. Generally, forging plants use bars or billets with relatively uniform microstructure and properties as raw materials, design rough shapes and formulate billet-making processes based on the part shape, and then perform free forging. From the perspective of forging steps, common billet-making steps include upsetting, flattening, drawing, widening, bending, twisting, piercing, reaming, and rolling. Furthermore, these processes basically rely on the upper hammer anvil of the forging equipment to apply vertical pressure to the high-temperature billet to achieve its thermoplastic deformation. In this basic thermoplastic deformation unit, precise control of key process parameters such as forging temperature, single-hammer deformation amount, single-hammer feed amount, and deformation rate is necessary to ensure consistent quality; existing processes do not adequately address this aspect. For titanium alloys, which have poor hot forming properties and are highly sensitive to thermal processing parameters, it is necessary to consider the specific hot deformation characteristics of the alloy to formulate a reasonable billet preparation process. At the same time, it is also required that the roughing die design be relatively simplified to facilitate implementation and reduce the scrap rate. Specifically, the forging temperature is fundamental to ensuring good plasticity and microstructure consistency in the billet; the single-hammer deformation amount and feed rate must be strictly controlled to gradually optimize the microstructure and achieve the preset dimensions; and the deformation rate must be matched with the temperature and deformation amount to ensure the uniformity and stability of the deformation process.

[0005] Currently, the following technical difficulties and limitations exist in the forging blank preparation of TC32 titanium alloy forgings: (1) Strong process specialization and lack of versatility. Existing technologies usually develop special blank preparation processes for forgings of specific shapes and sizes. For example, landing gear, joints, frame beams and disc and ring forgings have large differences in part shape and performance requirements. The forging fire, deformation amount, deformation method (commonly such as upsetting, drawing, bending, etc.) in their blank preparation process all need to be designed separately, resulting in a long process flow and high processing cost. (2) Unstable microstructure control and large performance fluctuations. Since the evolution of the microstructure of titanium alloy forgings depends on deformation temperature, deformation amount and deformation rate, the existing blank preparation process is difficult to achieve uniform and controllable deformation on the entire pre-formed blank when dealing with complex forgings and forgings with different microstructure types. This can easily lead to uneven microstructure, such as local coarse grains, mixed grains or excessive texture.

[0006] Therefore, there is an urgent need to develop a versatile, stable, and cost-controllable forging process for TC32 titanium alloy. This process should be applicable to forgings with different microstructures and provide a preform with uniform microstructure and consistent properties for subsequent die forging and heat treatment. This would provide a reliable technical guarantee for the efficient, high-quality, and low-cost manufacturing of TC32 titanium alloy forgings with various microstructures. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to provide a TC32 titanium alloy forging blank preparation process that is highly versatile, stable, and cost-controllable, so as to solve the above-mentioned technical problem, so that the process can be applied to forgings with different microstructure types, and can provide a preform with uniform microstructure and high performance consistency for subsequent die forging and heat treatment.

[0008] The technical solution of this invention is:

[0009] On the one hand, a general forging and blanking process for TC32 titanium alloy is provided, the steps of which are as follows: Step 1: Heat and hold the bar stock or forging billet in an electric resistance furnace, wherein the heating temperature T: 810.0℃≤T≤910.0℃, and the holding time is 45min~450min; Step 2: After heat preservation, remove the forged blank from the furnace: Single hammer reduction ε on the upper anvil 单锤 =(H0-H) / H0, and 0≤ε 单锤 ≤25.0%, where H0 (unit: mm) is the original height of the billet before pressing, and H (unit: mm) is the height of the billet after pressing; the average pressing rate V of the upper hammer anvil is 0.01 s. -1 ≤V≤0.50 s -1 The single hammer feed amount of the billet is L=ηB, where B (unit: mm) is the width of the upper hammer anvil, and η is the feed coefficient: 0≤η≤1; Step 3: After the forging process is completed, air cooling or hot material is returned to the furnace for heat preservation before proceeding to the next forging cycle.

[0010] For example, in step one, a resistance furnace is used to heat and hold the bar or forging billet at a temperature T of 810.0℃ ≤ T ≤ 890.0℃. For instance, this could be 815℃, 820℃, 825℃, 830℃, 835℃, 840℃, 845℃, 850℃, 855℃, 860℃, 865℃, 870℃, 875℃, 880℃, 885℃, 890℃, 895℃, 900℃, or 905℃. It should be understood that the above values ​​include, but are not limited to, those listed above. The numerical values ​​are applicable to any other numerical points within the range; the heat preservation time is 45min to 450min, for example, it can be 65min, 95min, 125min, 155min, 185min, 215min, 245min, 275min, 305min, 335min, 365min, 395min, 425min. It should be understood that the above values ​​include, but are not limited to, the listed values, and any other numerical points within the range are applicable.

[0011] Preferably, in step two, after the heat preservation is completed, the forging blank is removed from the furnace: the single hammer reduction ε on the upper anvil... 单锤 =(H0-H) / H0, and 0≤ε单锤 ≤25.0%, for example, can be 3%, 6%, 9%, 12%, 15%, 18%, 21%, 24%. It should be understood that the above values ​​include, but are not limited to, the listed values, and any other value points within the range are also applicable; where H0 (unit: mm) is the original height of the billet before pressing, and H (unit: mm) is the height of the billet after pressing; the average pressing rate V of the upper hammer anvil is 0.01 s. -1 ≤V≤0.50 s -1 For example, it could be 0.03 s -1 0.06 s -1 0.09 s -1 0.12 s -1 0.15 s -1 0.18 s -1 0.21 s -1 0.24 s -1 0.27 s -1 0.30 s -1 0.33 s -1 0.37 s -1 0.40 s -1 0.43 s -1 0.46 s -1 0.49 s -1 It should be understood that the above values ​​include, but are not limited to, the listed values, and any other value points within the range are also applicable; the single hammer feed amount of the billet L=ηB, where B (unit: mm) is the width of the upper hammer anvil, and η is the feed coefficient: 0≤η≤1, for example, it can be 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9. It should be understood that the above values ​​include, but are not limited to, the listed values, and any other value points within the range are also applicable.

[0012] During the single-fire forging of the billet, the final forging temperature of the billet should be controlled at ≥700.0℃, for example, it can be 710℃, 720℃, 730℃, 740℃, 750℃, 760℃, 770℃, 780℃, 790℃, or 800℃. It should be understood that the above values ​​include, but are not limited to, the listed values, and any other value points within the range are also applicable. Preferably, it is controlled at 700.0℃~850℃.

[0013] During the single-fire forging of the billet, the width B of the upper hammer anvil and the height H0 of the billet before pressing should satisfy B / H0 > 0.8. For example, it can be 0.8, 0.9, 1.0, 1.1, 1.2, 1.3, 1.4, or 1.5. It should be understood that the above values ​​include, but are not limited to, the listed values, and any other value points within the range are also applicable.

[0014] When forging billets in a single-fire process, the billet should be pressed down at a uniform speed using a single hammer.

[0015] When forging a billet in a single fire, the total deformation should be controlled to be ≤45.0%, for example, it can be 10%, 15%, 20%, 25%, 30%, 35%, or 40%. It should be understood that the above values ​​include, but are not limited to, the listed values, and any other value points within the range are also applicable.

[0016] When forging and shaping billets, the single hammer feed coefficient η should be controlled to be ≤1 / 2, for example, it can be 0.1, 0.2, 0.3, or 0.4. It should be understood that the above values ​​include, but are not limited to, the listed values, and any other value points within the range are also applicable.

[0017] When the forged billet is widened and deformed, the single hammer feed coefficient η should be controlled to be greater than 1 / 2, for example, it can be 0.6, 0.7, 0.8, 0.9, or 1.0. It should be understood that the above values ​​include, but are not limited to, the listed values, and any other value points within the range are also applicable.

[0018] When forging blanks and causing localized deformations such as elongation, widening, and bending, the number of dry-firing cycles allowed for the undeformed areas should be controlled to ≤10 cycles. For example, it can be 1, 2, 3, 4, 5, 6, 7, 8, or 9 cycles.

[0019] The numerical ranges described in this invention include not only the specific values ​​listed above, but also any values ​​within the ranges not listed above. Due to space limitations and for the sake of brevity, this invention will not list the specific values ​​included in each range.

[0020] The beneficial effects of this invention are: This technology addresses the challenges of numerous steps in the blanking process of TC32 titanium alloy, as well as the significant and specific variations in deformation between forging cycles. By extracting and analyzing the basic thermoplastic deformation units during the forging process, it identifies and optimizes multi-parameter process windows for parameters such as forging temperature, single-hammer deformation, single-hammer feed rate, and deformation rate. This effectively solves the technical problem of poor versatility in existing forging processes. This technology is particularly suitable for forging blanks of various microstructures (e.g., bimodal, lamellar, and basket-like microstructures) of TC32 titanium alloy forgings, including outer cylinders, frame beams, joints, cylinder bodies, and disc shafts. It effectively avoids problems such as uneven microstructure, poor performance consistency, and high forging costs caused by rough control of process parameters, significantly improving the stability and forming efficiency of the forging process. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0022] The features of various aspects of the embodiments of the present invention will now be described in detail. In the following detailed description, numerous specific details are set forth to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention can also be practiced without these specific details. The following description of the embodiments is merely intended to provide a better understanding of the invention by illustrating examples. The invention is not limited to any specific setups and methods provided below, but covers all improvements, substitutions, etc., to product structures and methods without departing from the spirit of the invention. In the following description, well-known structures and techniques are not shown to avoid unnecessarily obscuring the invention.

[0023] The method flow of the present invention will be described in detail below with reference to embodiments: The (α+β) type two-phase titanium alloy with the Chinese material designation TC32 has a chemical composition that meets the requirements of "Titanium and Titanium Alloy Grades and Chemical Composition (GB / T 3620.1-2016)". Its main chemical element contents (weight percentage) are as follows: Al 4.5%~5.5%, Mo 2.5%~3.5%, Cr 2.5%~3.5%, Zr 0.5%~1.5%, Si 0.1%~0.2%, Fe ≤0.3%, C ≤0.08%, N ≤0.05%, H ≤0.0125%, O ≤0.2%, and the balance is Ti.

[0024] Example 1: Taking the forging of a "Y"-shaped die forging blank as an example, the maximum outline of the blank is 1480.0×350.0×320.0mm, the width B of the hydraulic press hammer anvil is 280.0mm, and TC32 titanium alloy Φ300.0mm bar is used as raw material. The main forging steps include: marking and positioning to determine the dividing point → flattening one end, adjusting the blank to the predetermined posture to initially form the "Y"-shaped outline → elongating the remaining blank portion → finishing. The blank heating temperature is 878.5℃, and it is held at that temperature for 250min before being taken out of the furnace for forging. During flattening and widening, the single hammer reduction of the upper hammer anvil is 12.0%, and the average reduction rate of the upper hammer anvil is 0.13 s. -1The single hammer feed rate of the billet is 180.0 mm (feeding coefficient η = 0.643); the single hammer reduction of the upper anvil during drawing is 14.0%, and the average reduction rate of the upper anvil is 0.09 s. -1 The billet was fed by a single hammer with a depth of 84.0 mm (feeding coefficient η = 0.3); the final forging temperature was 722.0℃; the total deformation per forging pass was 38.5%; when flattening the billet into a "Y" shape, the other end was air-fired once; when drawing out the remaining billet, the "Y" shape end was air-fired three times; after forging, the blank was air-cooled. The dimensions of the blank met the process design requirements. After subsequent ordinary die forging and double annealing heat treatment, a dual-phase microstructure forging was obtained, with uniform high and low magnification microstructure and performance meeting the forging standard requirements.

[0025] Example 2: Taking the forging of multi-step, high-rib, variable cross-section beam-type die forging blanks as an example, the maximum profile of the blank is 1700.0×520.0×280.0mm, the maximum thickness is 280.0mm, the minimum thickness is 125.0mm, the width of the hydraulic press hammer anvil is 280.0mm, and TC32 titanium alloy Φ400.0mm bar stock is used as raw material. The main forging steps include: upsetting → flattening and widening, shaping into a square billet → continuing upsetting → continuous widening, shaping into a square billet → continuous drawing to the predetermined size → finishing. The billet heating temperature is 871.5℃, and it is held at that temperature for 320.0min before being taken out of the furnace for forging. During upsetting, the single hammer reduction of the upper hammer anvil is 9.0%, and the average reduction rate of the upper hammer anvil is 0.05s. -1 During the widening and shaping process, the single hammer pressing amount of the upper hammer anvil was 11.0%, and the average pressing rate of the upper hammer anvil was 0.08 s. -1 The single hammer feed rate of the billet is 160.0 mm; during continuous drawing, the single hammer reduction of the upper hammer anvil is 8.0%, and the average reduction rate of the upper hammer anvil is 0.02 s. -1 The billet was fed by a single hammer with a feed rate of 130.0 mm; the final forging temperature was 745.0℃; the total deformation per forging pass was 35.5%; the billet with a maximum thickness of 280.0 mm was air-fired 7 times; and air-cooled after forging. The dimensions of the forged blank met the process design requirements. After subsequent ordinary die forging and quasi-β heat treatment, a lamellar structure forging was obtained, with uniform high and low magnification microstructure and properties that met the forging standard requirements.

[0026] Example 3: Taking the forging of an ultra-large integral frame forging blank as an example, the maximum profile of the blank is 3300.0×1450.0×140.0mm, the maximum thickness of the blank is 140.0mm, the minimum thickness of the blank is 85.0mm, the width of the hydraulic press hammer anvil is 280.0mm, and the raw material is a TC32 titanium alloy square billet with a specification of 3300.0×1450.0×140.0mm. The main forging steps include: cutting off the unused material at the four corners of the blank → continuous longitudinal drawing → continuous transverse widening → finishing. The blank heating temperature is 873.0℃, and it is held at that temperature for 120.0min before being taken out of the furnace for forging (the hot material is held at that temperature for 60.0min when it is returned to the furnace for forging); during continuous longitudinal drawing, the single hammer reduction of the upper hammer anvil is 10.0%, and the average reduction rate of the upper hammer anvil is 0.03s. -1 The single hammer feed rate of the billet is 120.0 mm; during continuous transverse widening, the single hammer reduction of the upper anvil is 7.0%, and the average reduction rate of the upper anvil is 0.06 s. -1 The billet was fed by a single hammer with a feed rate of 250.0 mm; the final forging temperature was 734.0℃; the total deformation per forging pass was 31.0%; the billet with a maximum thickness of 140.0 mm was air-fired 8 times; and air-cooled after forging. The dimensions of the forged blank met the process design requirements. After subsequent ordinary die forging and quasi-β heat treatment, a lamellar structure forging was obtained, with uniform high and low magnification microstructure and performance meeting the forging standard requirements.

[0027] Example 4: Taking the forging of an integral bladed disk as an example, the blank is an upsetting die with a height H=200.0mm. The upper and lower anvils of the hydraulic press are flat dies. TC32 titanium alloy Φ400.0mm bars are used as raw materials. The main forging steps include: upsetting. The billet is heated to 863.0℃ and held for 320.0min before being removed from the furnace (for hot material remelting, it is held for 160.0min). The average pressing rate of the flat die on the upper anvil during upsetting is 0.04 s. -1 The final forging temperature was 785.0℃; the total deformation per forging pass was 43.0%; and the forging was air-cooled after completion. The dimensions of the forged blank met the process design requirements. After subsequent ordinary die forging and double annealing heat treatment, a dual-phase microstructure forging was obtained, with uniform high and low magnification microstructure and performance meeting the standard requirements for disc forgings.

[0028] Example 5: Taking the forging blank of a "Z"-shaped balanced elbow forging as an example, the maximum profile of the blank is 800.0×130.0×120.0mm, the width of the hydraulic press hammer anvil is 280.0mm, and TC32 titanium alloy Φ200.0mm bar is used as raw material. A low-cost, short-process processing method is adopted, and the main forging steps include: drawing → bending → finishing. The billet heating temperature is 845.0℃, and it is held at that temperature for 170 minutes before being removed from the furnace for forging (the hot material is held at that temperature for 70 minutes during reflow forging). During continuous longitudinal drawing, the single hammer reduction of the upper hammer anvil is 23.0%, and the average reduction rate of the upper hammer anvil is 0.35 s. -1 The billet was fed by a single hammer with a depth of 70.0 mm; the final forging temperature was 710.0℃; the total deformation per forging pass was 44.5% (5.0% during bending); the undeformed portion of the billet was air-fired twice during bending; and air-cooled after forging. The dimensions of the resulting rough mold met the process design requirements. Subsequent forging using ordinary die forging and double annealing heat treatment yielded a dual-phase microstructure forging with uniform high and low magnification microstructure, and its properties met the forging standard requirements.

[0029] Example 6: Taking the forging of a multi-step cylindrical forging blank as an example, the maximum profile of the blank is Φ160.0×530.0mm, the maximum cross-section is Φ160.0mm, the minimum cross-section is Φ116.0mm, the width of the hydraulic press hammer anvil is 280.0mm, and TC32 titanium alloy Φ200.0mm bar stock is used as raw material. The main forging steps include: drawing → finishing. The billet heating temperature is 858.0℃, and it is held at that temperature for 160min before being taken out of the furnace for forging (the hot material is held at that temperature for 80min when it is returned to the furnace for forging). During the longitudinal continuous drawing, the single hammer reduction of the upper hammer anvil is 15.0%, and the average reduction rate of the upper hammer anvil is 0.15s. -1 The billet was fed by a single hammer with a feed rate of 100.0 mm; the final forging temperature was 728.0℃; the total deformation per forging pass was 29.5%; the billet with a maximum thickness of Φ160.0 mm was air-fired twice; and air-cooled after forging. The dimensions of the forged blank met the process design requirements. After quasi-β die forging and double annealing heat treatment, a basket-type forging was obtained, with uniform high and low magnification microstructure and properties that met the forging standard requirements.

[0030] Example 7: Taking the forging of a cross-shaped high-rib, thick-section die forging blank as an example, the maximum profile of the blank is 480.0×350.0×350.0mm, the width of the hydraulic press hammer anvil is 280.0mm, and TC32 titanium alloy Φ300.0mm bar stock is used as raw material. The main forging steps include: upsetting → longitudinal drawing to square billet → continued upsetting → widening → local drawing and widening to the predetermined size → finishing. The billet heating temperature is 881.5℃, and it is held at that temperature for 240.0min before being taken out of the furnace for forging. During upsetting, the single hammer reduction of the upper hammer anvil is 16.0%, and the average reduction rate of the upper hammer anvil is 0.18 s. -1During longitudinal elongation, the single hammer reduction of the upper anvil was 11.5%, and the average reduction rate of the upper anvil was 0.07 s. -1 The single hammer feed rate of the billet is 110.0 mm; during the widening and shaping process, the single hammer reduction of the upper anvil is 13.0%, and the average reduction rate of the upper anvil is 0.02 s. -1 The billet was fed by a single hammer with a depth of 200.0 mm; the final forging temperature was 755.0℃; the total deformation per forging pass was 37.0% (22.0% during local elongation and widening); the undeformed area of ​​the rough die was air-fired twice; and air-cooled after forging. The dimensions of the rough die met the process design requirements. After subsequent ordinary die forging and double annealing heat treatment, a dual-phase microstructure forging was obtained, with uniform high and low magnification microstructure and performance meeting the forging standard requirements.

[0031] Example 8: Taking the forging of an integral bladed disk as an example, the blank is an upsetting die with a height H=180.0mm. The upper and lower anvils of the hydraulic press are flat dies. TC32 titanium alloy Φ300.0mm bars are used as raw materials. The main forging steps include: upsetting. The billet is heated to 834.0℃ and held for 270.0min before being removed from the furnace (the hot material is held for 135.0min during reflow forging). The average pressing rate of the flat die on the upper anvil during upsetting is 0.03 s. -1 The final forging temperature was 770.0℃; the total deformation per forging pass was 41.0%; and the forging was air-cooled after completion. The dimensions of the forged blank met the process design requirements. After subsequent quasi-β die forging and double annealing heat treatment, a basket-type forging was obtained, with uniform high and low magnification microstructure and properties that met the standard requirements for disc forgings.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present invention, and these modifications or substitutions should be covered within the protection scope of the present invention.

Claims

1. A general forging and blanking process for TC32 titanium alloy, characterized in that, The process includes the following steps: Step 1: Heat and hold the bar stock or forging billet at a temperature T of 810.0℃ ≤ T ≤ 910.0℃ for 45 min to 450 min. Step 2: After the heat treatment is completed, remove the forged blank from the furnace and press down the single hammer on the anvil with a depth ε. 单锤 =(H0-H) / H0, and 0≤ε 单锤 ≤25.0%, where H0 (unit: mm) is the original height of the billet before pressing, and H (unit: mm) is the height of the billet after pressing; the average pressing rate V of the upper hammer anvil is 0.01 s. -1 ≤V≤0.50 s -1 The single hammer feed amount of the billet is L=ηB, where B (unit: mm) is the width of the upper hammer anvil, and η is the feed coefficient: 0≤η≤1; Step 3: After the forging process is completed, either air-cool or return the hot material to the furnace for heat preservation before proceeding to the next forging cycle.

2. The process according to claim 1, characterized in that, When forging billets in a single forging process, the final forging temperature of the billet should be controlled at ≥700.0℃.

3. The process according to claim 1, characterized in that, When forging billets in a single-fire process, the width B of the upper hammer anvil and the height H0 of the billet before pressing should satisfy B / H0 > 0.

8.

4. The process according to claim 1, characterized in that, When forging billets in a single-fire process, the billet should be pressed down at a uniform speed using a single hammer.

5. The process according to claim 1, characterized in that, When forging billets in a single fire, the total deformation should be controlled to be ≤45.0%.

6. The process according to claim 1, characterized in that, When forging billets and drawing them out, the single hammer feed coefficient η should be controlled to be ≤1 / 2.

7. The process according to claim 1, characterized in that, When the forged billet is widened and deformed, the single hammer feed coefficient η should be controlled to be greater than 1 / 2.

8. The process according to claim 1, characterized in that, When forging billets and subjecting them to localized deformations such as elongation, widening, and bending, the number of dry-firing cycles allowed for the undeformed areas should be controlled to ≤10.

9. The process according to claim 1, characterized in that, The raw materials for bars or forgings are smelted in a vacuum arc furnace, and their chemical composition (by weight percentage) is as follows: Al 4.5%~5.5%, Mo 2.5%~3.5%, Cr 2.5%~3.5%, Zr 0.5%~1.5%, Si 0.1%~0.2%, Fe ≤0.3%, C ≤0.08%, N ≤0.05%, H ≤0.0125%, O ≤0.2%, with the balance being Ti.

10. The process according to claim 1, characterized in that, Step one, heating and heat preservation, is carried out in a resistance furnace.