A method for manufacturing a titanium alloy dual-property disc forging

Abstract

This invention provides a method for preparing a dual-performance TC11 titanium alloy forged disk, comprising: forging a TC11 titanium alloy bar at a two-phase region temperature T1 to obtain a forged billet; reheating the forged billet in the furnace at a temperature T2 and holding it at that temperature; then forging and deforming a portion of the forged billet using a washer to obtain a bladed disk forging; and finally heat-treating the bladed disk forging. This invention utilizes different matching temperatures between the forging temperature and the heat treatment temperature of the TC11 titanium alloy in the two-phase region to obtain different microstructures, thus preparing a dual-performance integral bladed disk. The preparation method provided by this invention is simple to operate and highly reliable.

Description

Technical Field

[0001] This invention belongs to the field of hot working technology of metallic materials, and particularly relates to a method for preparing a titanium alloy dual-performance disc forging, and more specifically to a method for preparing a TC11 titanium alloy dual-performance disc forging. Background Technology

[0002] TC11 alloy is a martensitic α+β type heat-resistant titanium alloy with a nominal composition of Ti6.5Al3.5Mo1.5Zr0.3Si. It possesses advantages such as high specific strength, good mid-temperature performance, good corrosion resistance, and high fatigue strength. Furthermore, it can be heat-treated for strengthening, making it a primary material for manufacturing aero-engines, high-pressure compressor disks, and blades. With the development of my country's aviation industry, on the one hand, the performance requirements for TC11 titanium alloy disks have increased, shifting from sample-level heat treatment to requirements for the entire disk after heat treatment; on the other hand, the degree of integration of disk components is increasing, reducing the risk of loosening and breakage at the joints of split bladed disks. Due to the different operating conditions of the blades and disk, blades and disks often require different microstructures and properties. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a method for preparing a titanium alloy dual-performance disk forging, wherein the integral bladed disk forging prepared by the method of the present invention has good dual properties.

[0004] This invention provides a method for preparing a titanium alloy dual-performance disk forging, comprising:

[0005] The titanium alloy bar is heated to a first temperature and held at that temperature before being forged in the first heat to obtain a forging billet.

[0006] The forging billet is heated to a second temperature and held for a second forging process to obtain a forging.

[0007] The forging is annealed to obtain a titanium alloy dual-performance disc forging.

[0008] Preferably, the titanium alloy has a composition of TC11.

[0009] Preferably, the first temperature is T1, and the second temperature is T2.

[0010] T β -60℃≤T1≤T β -20℃, T β -60℃≤T2≤T β -20℃;

[0011] T β β is the β phase transformation temperature of the titanium alloy bar.

[0012] The first temperature and the second temperature are different.

[0013] Preferably, the holding time for heating to the first temperature is set according to the thickness of the titanium alloy bar, which is 0.6 to 1 min / mm.

[0014] The holding time for heating to the second temperature is set according to the thickness of the forging billet, which is 0.6 to 1 min / mm.

[0015] Preferably, the deformation amount of the first forging and the second forging is independently selected from 30% to 50%.

[0016] Preferably, the press downward speed in the first and second forging processes is independently selected from 0.2 to 0.5 mm / s.

[0017] Preferably, the annealing process includes:

[0018] Perform one annealing process followed by a second annealing process;

[0019] The temperature for the first annealing is T3.

[0020] T β -50℃≤T3≤T β -30℃

[0021] T β is the β-phase transformation temperature of the titanium alloy bar.

[0022] Preferably, the temperature of the secondary annealing is 520–540°C.

[0023] Preferably, the holding time for the first annealing is 1 to 2 hours;

[0024] The holding time for the secondary annealing is 4 to 8 hours.

[0025] Preferably, when the first temperature is greater than or equal to the temperature of the first annealing, the temperature of the first annealing is greater than or equal to the second temperature;

[0026] When the first temperature is less than the temperature of the first annealing, the temperature of the first annealing is less than the second temperature.

[0027] This invention provides a method for preparing a TC11 titanium alloy dual-performance disk forging, comprising: forging a TC11 titanium alloy bar at a two-phase region temperature T1 to obtain a forging blank; reheating the forging blank in the furnace at a temperature T2 and holding it at that temperature; then forging and deforming a portion of the forging blank using a washer to obtain a bladed disk forging; and finally heat-treating the bladed disk forging. The method provided by this invention utilizes different forging temperatures to deform different parts, followed by heat treatment. By different matching temperatures between the forging temperature and the heat treatment temperature of the TC11 titanium alloy in the two-phase region, different microstructures are obtained, thus preparing a dual-performance integral bladed disk. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the first forging process in an embodiment of the present invention, where a is the initial state of the bar in the mold and b is the state after the first forging process is completed.

[0029] Figure 2 This is a schematic diagram of the second forging process in an embodiment of the present invention, where a is the initial state of the forging billet in the mold and b is the state after the second forging process is completed.

[0030] Figure 3 The image shows the bottom and high-magnification microstructure of the dual-performance disk prepared in Example 1. Detailed Implementation

[0031] The technical solutions in the embodiments of the present invention will be clearly and completely described below. 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.

[0032] This invention provides a method for preparing a titanium alloy dual-performance disk forging, comprising:

[0033] The titanium alloy bar is heated to a first temperature and held at that temperature before being forged in the first heat to obtain a forging billet.

[0034] The forging billet is heated to a second temperature and held for a second forging process to obtain a forging.

[0035] The forging is annealed to obtain a titanium alloy dual-performance disc forging.

[0036] In this invention, the titanium alloy bar is preferably composed of TC11, i.e., Ti6.5Al3.5Mo1.5Zr0.3Si; and the titanium alloy bar is preferably a forged bar.

[0037] The present invention does not impose any special restrictions on the source of the titanium alloy rod, which can be obtained from the market, such as TC11 titanium alloy rod with a specification of Ф300mm provided by Western Superconducting Materials Technology Co., Ltd.

[0038] In this invention, the heating to the first temperature is preferably achieved by machining a positioning hole at one end of a titanium alloy bar and placing it in a forging furnace to heat it to the first temperature.

[0039] In this invention, the first temperature is T1, and preferably satisfies the following conditions:

[0040] T β -60℃≤T1≤T β -20℃;

[0041] T βis the β-phase transformation temperature of the titanium alloy bar.

[0042] In this invention, the T β The preferred method for obtaining it is metallographic method, and the specific method includes:

[0043] A Ф10×15mm sample was axially cut from the end face of the bar. Then, different samples were heated and held at different temperatures (5℃ interval between each heating point) for 30 minutes near the estimated β phase transformation temperature. After rapid quenching, the samples were polished and etched after quenching and observed for the α phase content in the metallographic structure. Five fields of view were observed for each sample. The temperature represented by the sample with an α phase content of less than 3% was determined as the phase transformation point temperature of that batch of bars.

[0044] In this invention, the holding time for heating to the first temperature is preferably set according to the thickness of the titanium alloy rod at 0.6 to 1 min / mm, more preferably 0.7 to 0.9 min / mm, and most preferably 0.8 min / mm; that is, the holding time is 0.6 to 1 min per mm of thickness, and the thickness of the titanium alloy rod is the effective thickness of the titanium alloy rod.

[0045] In this invention, the process of heating to the first temperature preferably further includes:

[0046] The titanium alloy rod is preheated and then coated with lubricant.

[0047] In this invention, the preheating temperature is preferably 250-350°C, more preferably 280-320°C, and most preferably 300°C; the lubricant preferably comprises: resin binder, glass powder, and water; the mass ratio of the resin binder, glass powder, and water is preferably (0.5-1.5):(0.5-1.5):(0.5-1.5), more preferably (0.8-1.2):(0.8-1.2):(0.8-1.2), and most preferably 1:1:1.

[0048] In this invention, the first hot forging is preferably performed on a hydraulic press; preferably, an upper die, a lower die, an ejector rod, and a die heating furnace are installed on the hydraulic press; preferably, the bar stock, after being heated to a first temperature and held at that temperature, is transferred to the die, and isothermal forging is performed on the bar stock through the upper die to obtain a forged billet. In this invention, the deformation amount of the first hot forging is preferably 30-50%, more preferably 35-45%, and most preferably 40%; the press descent rate during the first hot forging process is preferably 0.2-0.5 mm / s, more preferably 0.3-0.4 mm / s.

[0049] In this invention, the process preferably includes the following steps prior to the first hot forging:

[0050] Heat the mold to the first temperature.

[0051] In this invention, it is preferable to heat the upper mold and the lower mold to a first temperature using a mold heating furnace.

[0052] In this invention, the heating to the second temperature is preferably carried out in the billet heating furnace. Preferably, after the first forging is completed, the ejector rod moves upward to eject the forging billet, and the forging billet is taken out and directly placed back into the billet heating furnace to be heated to the second temperature.

[0053] In this invention, the second temperature is T1, and preferably satisfies the following conditions:

[0054] T β -60℃≤T2≤T β -20℃;

[0055] T β is the β-phase transformation temperature of the titanium alloy bar.

[0056] In this invention, the first temperature and the second temperature are different.

[0057] In this invention, the heating to the second temperature and holding it is preferably done after the forging blank obtained after the first forging is heated to the second temperature and then the holding time is started; the holding time is preferably set according to the thickness of the forging blank obtained after the first forging is 0.6 to 1 min / mm, more preferably 0.7 to 0.9 min / mm, and most preferably 0.8 min / mm; that is, the holding time is 0.6 to 1 min per mm of thickness, and the thickness of the forging blank obtained after the first forging is the effective thickness of the forging blank obtained after the first forging is completed.

[0058] In this invention, the second heat forging preferably involves transferring the forging billet, after being heated to a second temperature and held at that temperature, to a die, and then performing a second heat isothermal forging on the billet using a descending upper die to obtain the forging. Preferably, a lower die washer is used to induce forging deformation in a portion of the forging billet. In this invention, the deformation amount of the second heat forging is preferably 30-50%, more preferably 35-45%, and most preferably 40%. The descending speed of the press during the second heat forging process is preferably 0.2-0.5 mm / s, more preferably 0.3-0.4 mm / s.

[0059] In this invention, after the second forging is completed, it preferably further includes:

[0060] The resulting forgings were air-cooled.

[0061] In this invention, the process preferably includes the following steps prior to the second fire forging:

[0062] Heat the mold to the second temperature.

[0063] In this invention, it is preferable to place the lower mold washer on the lower mold and heat the upper mold, lower mold, and ejector rod to a second temperature using a mold heating furnace.

[0064] In this invention, the annealing treatment is preferably a double annealing treatment; the annealing treatment method preferably includes:

[0065] Perform one annealing process followed by a second annealing process.

[0066] In this invention, the temperature of the first annealing is T3, preferably satisfying the following conditions:

[0067] T β -50℃≤T3≤T β -30℃

[0068] T β The phase transformation temperature of the titanium alloy bar is given.

[0069] In this invention, the holding time for the first annealing is preferably 1 to 2 hours, more preferably 1.5 hours; after the first annealing is completed, it is also preferred to perform air cooling.

[0070] In this invention, the temperature of the secondary annealing is preferably 520-540℃, more preferably 525-535℃, and most preferably 530℃; the holding time of the secondary annealing is preferably 4-8h, more preferably 5-7h, and most preferably 6h; after the secondary annealing is completed, it is preferable to further include air cooling.

[0071] In this invention, it is preferred that when the first temperature is greater than or equal to the temperature of the first annealing, the temperature of the first annealing is greater than or equal to the second temperature; when the first temperature is less than the temperature of the first annealing, the temperature of the first annealing is less than the second temperature; that is, when T1 is greater than or equal to T3, T3 is greater than or equal to T2; when T1 is less than or equal to T3, T3 is less than or equal to T2.

[0072] In an embodiment of the present invention, the preparation method of the titanium alloy dual-performance disk forging is as follows: Figure 1 and Figure 2 As shown, Figure 1 and Figure 2 In the diagram, 1 is the upper die, 2 is the lower die, 3 is the ejector rod, 4 is the die heating furnace, 5 is the bar billet, 6 is the forging billet, 7 is the lower die washer, and 8 is the disc forging; preferably, it includes:

[0073] Step 1: Detect the phase transformation temperature T of the TC11 titanium alloy used. β ;

[0074] Step 2: Install the upper mold 1, lower mold 2, ejector rod 3, and mold heating furnace 4 on the hydraulic press;

[0075] Step 3: Cut the TC11 titanium alloy round bar into billet 5 according to the forging specifications. Machining a positioning hole at one end of the billet, preheating the billet 1 to 300℃, spraying lubricant on its surface, and then placing the billet 1 into the forging furnace and heating it to temperature T1 (Tβ -60℃≤T1≤T β -20℃), heat preservation, the heat preservation time is calculated based on the effective thickness of the billet 0.6~1min / mm;

[0076] Step 4: Heat the upper die 1 and lower die 2 to T1. During heating, heat the die heating furnace 4. Then transfer the billet 5 heated in step 3 to the die. The upper die 1 moves down to perform isothermal forging of the billet 5 into a forging billet 6. The deformation is 30% to 50%. The press descends at a speed of 0.2 mm / s to 0.5 mm / s. Start the first forging.

[0077] Step 5: After the first forging is completed, the ejector rod moves upward, ejecting the forging billet 6. The forging billet is then removed and placed directly back into the billet heating furnace; the billet heating furnace temperature is T2 (T β -60℃≤T2≤T β -20℃), after the forging billet 6 is heated to T2 temperature, heat preservation begins, and the heat preservation time is calculated based on the effective thickness of the billet 0.6~1min / mm;

[0078] Step 6: Place the lower mold washer 7 on the lower mold, and heat the upper mold 1, lower mold 2, and ejector rod 3 to temperature T2 using the mold heating furnace 4;

[0079] Step 7: After the forging billet 6 has been kept warm, it is transferred to the mold and the forging billet 6 is subjected to a second isothermal forging through the upper mold 1 to form the forging 8; the deformation is 30% to 50%, and the downward speed of the press is 0.2 mm / s to 0.5 mm / s; after forging is completed, the forging 8 is taken out and air-cooled.

[0080] Step 8: Forging 8 undergoes double annealing heat treatment. The first annealing process involves heating forging 8 to temperature T3 (T β -50℃≤T3≤T β -30℃), hold for 1-2 hours, then air cool; the second annealing treatment is to heat the forging 8 after the first annealing treatment to 520℃-540℃, hold for 6 hours, then air cool.

[0081] The manufacturing method of TC11 titanium alloy dual-performance integral bladed disk provided by the present invention achieves forging deformation of different parts of the disk forging at different temperatures through simple tooling. Then, by matching the forging temperature and heat treatment temperature of TC11 titanium alloy, different microstructures and properties can be obtained. Different microstructures and properties are obtained after heat treatment. The method is simple to operate and highly reliable.

[0082] The TC11 titanium alloy round bars used in the following embodiments of the present invention are 300mm TC11 titanium alloy bars (forged state) provided by Western Superconducting Materials Technology Co., Ltd.; the lubricant used is a resin binder, glass powder and water in a mass ratio of 1:1:1, and the resin binder is M60 resin binder provided by Beijing Tianlichuang Glass Technology Development Co., Ltd.; the phase transformation temperature of the titanium alloy is T. β The detection method is as follows:

[0083] A Ф10×15mm sample was axially cut from the end face of the bar. Then, different samples were heated and held at different temperatures (5℃ interval between each heating point) for 30 minutes near the estimated β phase transformation temperature. After rapid quenching, the samples were polished and etched after quenching and observed for the α phase content in the metallographic structure. Five fields of view were observed for each sample. The temperature represented by the sample with an α phase content of less than 3% was determined as the phase transformation point temperature of that batch of bars.

[0084] Example 1

[0085] Dual-performance integral bladed disk forgings were prepared according to the following method, such as... Figure 1 and Figure 2 As shown:

[0086] Step 1: Detect the phase transformation temperature T of the TC11 titanium alloy used. β It is 1005℃.

[0087] Step 2: Install the upper mold 1, lower mold 2, ejector rod 3 and mold heating furnace 4 on the hydraulic press.

[0088] Step 3: Cut the TC11 titanium alloy round bar into billet 5 according to the forging specifications, with a size of Φ200mm×340mm. Machining a positioning hole at one end of the billet, preheating the billet 1 to 300℃ and spraying lubricant on its surface, then placing the billet 1 into the forging heating furnace and heating it to a temperature of T1=980℃, holding it at that temperature for 120min.

[0089] Step 4: Heat the upper die 1 and lower die 2 to T1. During heating, heat the die heating furnace 4. Then transfer the billet 5 heated in step 3 to the die. The upper die 1 moves down to perform isothermal forging of the billet 5 into a forging billet 6 with a deformation of 40%. The press descends at a speed of 0.2 mm / s to start the first forging.

[0090] Step 5: After the first forging is completed, the ejector rod moves upward and ejects the forging billet 6. The forging billet is then removed and placed directly back into the billet heating furnace. The temperature of the billet heating furnace is T2 = 960℃. After the forging billet 6 is heated to T2 temperature, it is kept at that temperature for 60 minutes.

[0091] Step 6: Place the lower mold washer 7 on the lower mold, and heat the upper mold 1, lower mold 2, and ejector rod 3 to temperature T2 using the mold heating furnace 4.

[0092] Step 7: After the forging billet 6 has been kept warm, it is transferred to the mold and the forging billet 6 is subjected to a second isothermal forging through the upper mold 1 to form the forging 8; the deformation amount is 30% and the downward speed of the press is 0.2mm / s; after the forging is completed, the forging 8 is taken out and air-cooled.

[0093] Step 8: Forging 8 undergoes double annealing heat treatment. First, it undergoes a first annealing treatment and then a second annealing treatment. The first annealing treatment involves heating forging 8 to a temperature of T3 = 970℃, holding it at that temperature for 2 hours, and then air cooling. The second annealing treatment involves heating forging 8, which has undergone the first annealing treatment, to 520℃, holding it at that temperature for 6 hours, and then air cooling.

[0094] The dual-performance integral bladed disk forging prepared in Example 1 of this invention is as follows: Figure 3 As shown in the optical micrographs (OM) of each part, it can be seen that the edge of the bladed disk forging (i.e., the blade area) has an equiaxed structure, with primary α evenly distributed on the β matrix, exhibiting good strength and plasticity. The middle part of the bladed disk forging (i.e., the disk body area) has a bimodal structure, with primary α evenly distributed in an equiaxed pattern and secondary α in a long strip network, exhibiting higher strength than the equiaxed structure but slightly lower plasticity. The structure of the transition zone between the blade and the disk body of the bladed disk forging is between the equiaxed and bimodal structures, showing that the primary α content is less than that of the equiaxed structure but more than that of the bimodal structure, and the secondary α content is more than that of the equiaxed structure but less than that of the bimodal structure, with both its width and length being smaller than that of the bimodal structure. Its performance level is between that of the equiaxed and bimodal structures.

[0095] Example 2

[0096] Dual-performance integral bladed disk forgings were prepared according to the following method, such as... Figure 1 and Figure 2 As shown:

[0097] Step 1: Detect the phase transformation temperature T of the TC11 titanium alloy used. β It is 1010℃.

[0098] Step 2: Install the upper mold 1, lower mold 2, ejector rod 3 and mold heating furnace 4 on the hydraulic press.

[0099] Step 3: Cut the TC11 titanium alloy round bar into billet 5 according to the forging specifications, with a size of Φ200mm×340mm. Machining a positioning hole at one end of the billet, preheating the billet 1 to 300℃ and spraying lubricant on its surface, then placing the billet 1 into the forging heating furnace and heating it to a temperature of T1=990℃, holding it at that temperature for 120min.

[0100] Step 4: Heat the upper die 1 and lower die 2 to T1. During heating, heat the die heating furnace 4. Then transfer the billet 5 heated in step 3 to the die. The upper die 1 moves down to perform isothermal forging of the billet 5 into a forging billet 6 with a deformation of 40%. The press descends at a speed of 0.5 mm / s to start the first forging.

[0101] Step 5: After the first forging is completed, the ejector rod moves upward and ejects the forging billet 6. The forging billet is then removed and placed directly back into the billet heating furnace. The temperature of the billet heating furnace is T2 = 970℃. After the forging billet 6 is heated to T2 temperature, it is kept at that temperature for 60 minutes.

[0102] Step 6: Place the lower mold washer 7 on the lower mold, and heat the upper mold 1, lower mold 2, and ejector rod 3 to temperature T2 using the mold heating furnace 4.

[0103] Step 7: After the forging billet 6 has been kept warm, it is transferred to the mold and the forging billet 6 is subjected to a second isothermal forging through the upper mold 1 to form the forging 8; the deformation amount is 30% and the downward speed of the press is 0.5mm / s; after the forging is completed, the forging 8 is taken out and air-cooled.

[0104] Step 8: Forging 8 undergoes double annealing heat treatment. First, it undergoes a first annealing treatment and then a second annealing treatment. The first annealing treatment involves heating forging 8 to a temperature of T3 = 980℃, holding it at that temperature for 2 hours, and then air cooling. The second annealing treatment involves heating forging 8, which has undergone the first annealing treatment, to 535℃, holding it at that temperature for 6 hours, and then air cooling.

[0105] Example 3

[0106] Dual-performance integral bladed disk forgings were prepared according to the following method, such as... Figure 1 and Figure 2 As shown:

[0107] Step 1: Detect the phase transformation temperature T of the TC11 titanium alloy used. β It is 1005℃.

[0108] Step 2: Install the upper mold 1, lower mold 2, ejector rod 3 and mold heating furnace 4 on the hydraulic press.

[0109] Step 3: Cut the TC11 titanium alloy round bar into billet 5 according to the forging specifications, with a size of Φ200mm×340mm. Machining a positioning hole at one end of the billet, preheating the billet 1 to 300℃ and spraying lubricant on its surface, then placing the billet 1 into the forging heating furnace and heating it to a temperature of T1=960℃, holding it at that temperature for 120min.

[0110] Step 4: Heat the upper die 1 and lower die 2 to T1. During heating, heat the die heating furnace 4. Then transfer the billet 5 heated in step 3 to the die. The upper die 1 moves downward to perform isothermal forging of the billet 5 into a forging billet 6 with a deformation of 40%. The downward speed of the press is 0.4 mm / s. Start the first forging.

[0111] Step 5: After the first forging is completed, the ejector rod moves upward and ejects the forging billet 6. The forging billet is then taken out and placed directly back into the billet heating furnace. The temperature of the billet heating furnace is T2 = 980℃. After the forging billet 6 is heated to T2 temperature, it is kept at that temperature for 60 minutes.

[0112] Step 6: Place the lower mold washer 7 on the lower mold, and heat the upper mold 1, lower mold 2, and ejector rod 3 to temperature T2 using the mold heating furnace 4.

[0113] Step 7: After the forging billet 6 has been kept warm, it is transferred to the mold and the forging billet 6 is subjected to a second isothermal forging through the upper mold 1 to form the forging 8; the deformation amount is 30% and the downward speed of the press is 0.4mm / s; after the forging is completed, the forging 8 is taken out and air-cooled.

[0114] Step 8: Forging 8 undergoes double annealing heat treatment. First, it undergoes a first annealing treatment and then a second annealing treatment. The first annealing treatment involves heating forging 8 to a temperature of T3 = 970℃, holding it at that temperature for 2 hours, and then air cooling. The second annealing treatment involves heating forging 8, which has undergone the first annealing treatment, to 540℃, holding it at that temperature for 6 hours, and then air cooling.

[0115] Performance testing

[0116] The integral bladed disk forging prepared in Example 1 was subjected to zoned room temperature tensile property testing. The tests were conducted according to GB / T228.1 "Metallic materials, tensile testing—Part 1: Room temperature test method". The test results are as follows:

[0117] Location <![CDATA[R m / Mpa]]> <![CDATA[R p0.2 / Mpa]]> A / ％ Z / ％ blade area 1117 995 16.2 44.9 transition zone 1133 997 15.8 40.9 Disk area 1171 1028 15.5 37.1

[0118] The edge of the bladed disk forging (i.e., the blade area) has an equiaxed structure, which has good strength and plasticity; the middle part of the bladed disk forging (i.e., the disk area) has a bimodal structure, which has higher strength than the equiaxed structure and slightly lower plasticity than the equiaxed structure; the structure of the transition area between the blade and the disk of the bladed disk forging is between the equiaxed structure and the bimodal structure, and its performance level is between the equiaxed structure and the bimodal structure.

[0119] The manufacturing method of TC11 titanium alloy dual-performance integral bladed disk provided by the present invention achieves forging deformation of different parts of the disk forging at different temperatures through simple tooling. Then, by matching the forging temperature and heat treatment temperature of TC11 titanium alloy, different microstructures and properties can be obtained. Different microstructures and properties are obtained after heat treatment. The method is simple to operate and highly reliable.

[0120] While the invention has been described and illustrated with reference to specific embodiments thereof, such description and illustration are not intended to limit the invention. It will be readily understood by those skilled in the art that various changes may be made to suit particular circumstances, materials, compositions, substances, methods, or processes to the objectives, spirit, and scope of this application without departing from the true spirit and scope of the invention as defined by the appended claims. All such modifications are intended to be within the scope of the appended claims. Although the methods disclosed herein have been described with reference to specific operations performed in a particular order, it should be understood that these operations may be combined, subdivided, or reordered to form equivalent methods without departing from the teachings of the invention. Therefore, unless specifically indicated herein, the order and grouping of operations are not a limitation of this application.

Claims

1. A method for preparing a titanium alloy dual-performance disc forging, comprising: The titanium alloy bar is heated to a first temperature and held at that temperature before being forged in the first heat to obtain a forging billet. The forging billet is heated to a second temperature and held for a second forging process to obtain a forging. The forging is annealed to obtain a titanium alloy dual-performance disc forging. The first temperature is T1, the second temperature is T2, and T β -60℃≤T1≤T β -20℃, T β -60℃≤T2≤T β -20℃; the first temperature and the second temperature are different; The annealing process includes: Perform one annealing process followed by a second annealing process; The temperature for the first annealing is T3. T β -50℃≤T3≤T β -30℃, T β β is the β phase transformation temperature of the titanium alloy bar. When the first temperature is greater than or equal to the temperature of the first annealing, the temperature of the first annealing is greater than or equal to the second temperature; When the first temperature is less than the temperature of the first annealing, the temperature of the first annealing is less than the second temperature.

2. The method according to claim 1, characterized in that, The titanium alloy has a composition of TC11.

3. The method according to claim 1, characterized in that, The holding time for heating to the first temperature is set according to the thickness of the titanium alloy bar, which is 0.6~1 min / mm. The holding time for heating to the second temperature is set according to the thickness of the forging billet, which is 0.6~1 min / mm.

4. The method according to claim 1, characterized in that, The deformation amount of the first forging and the second forging is independently selected from 30 to 50%.

5. The method according to claim 1, characterized in that, The press descent speed in the first and second forging processes is independently selected from 0.2 to 0.5 mm / s.

6. The method according to claim 1, characterized in that, The temperature for the secondary annealing is 520~540℃.

7. The method according to claim 1, characterized in that, The holding time for the first annealing is 1-2 hours; The holding time for the secondary annealing is 4 to 8 hours.

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