A local forming manufacturing method of a high-temperature alloy GH738 turbine disc

Abstract

The present application relates to the field of hot working forging technology of high-temperature alloy in manufacturing industry, and particularly relates to a local forming manufacturing method of high-temperature alloy GH738 turbine disc. First, the high-temperature alloy GH738 cylindrical blank is heated and kept warm, then soft sleeve and hard sleeve are sequentially performed, and the blank with the sleeve is placed in an electric furnace for heating and keeping warm; after the blank is completely heated, upsetting process, arc anvil local rotary forging forming and rectangular anvil local rotary forging forming are sequentially performed to obtain a forged piece; finally, the forged piece is subjected to solid solution treatment, stabilization treatment and aging treatment in sequence to complete the local forming of the high-temperature alloy GH738 turbine disc, and a forged piece with uniform structure and good performance is obtained.

Description

TECHNICAL FIELD

[0001] The application relates to the field of hot working forging technology of high-temperature alloy in the manufacturing industry, and particularly relates to a local forming manufacturing method of a high-temperature alloy GH738 turbine disc. BACKGROUND

[0002] Compared with other structural materials, the high-temperature alloy GH738 has excellent mechanical properties, good creep resistance, good surface stability and excellent corrosion resistance at a higher temperature, and is mainly applied in aerospace and marine turbine engines. The turbine disc is a main application product of the high-temperature alloy GH738, and due to the fact that the material contains a large amount of strengthening elements, the high-temperature strength of the material is high, and the plasticity is low, so the material is prone to cracking in the process of machining. The increase of the deformation resistance of the alloy increases the load borne by the press, and with the development of the engine in the direction of large-scale, high thrust-to-weight ratio and high efficiency, manufacturing large high-temperature alloy turbine disc parts has become an urgent requirement in future development.

[0003] The production mode of the turbine disc generally adopts a forging process. Since the hot working temperature range of the high-temperature alloy is narrow, the decrease of the deformation temperature will cause the deformation resistance to increase sharply, and in the actual forging process, a multi-fire process is adopted, that is, the high-temperature alloy is forged to a certain extent, then reheated and forged to the required size, and the above operation can be repeated multiple times until the forging is formed to the finished size. The overall production process of the large turbine disc is as follows: firstly, the blank is opened, and then according to the forging process, the blank can be divided into free forging and die forging, both of which need to be upset to a certain size, and the free forging is formed after the multi-fire forging of the reheated blank. The die forging needs to be finally formed on the die. Since the deformation resistance of the high-temperature alloy is large and the area size of the large turbine disc is large, the carrying capacity of the press equipment needs to be strictly required.

[0004] Patent CN103341586A discloses a forming method of a GH4738 nickel-based high-temperature alloy turbine disc, uses a hard sleeve before forging + composite insulation of insulation cotton for insulation after forging, and adopts a double aging treatment after a solid solution treatment at a sub-solid solution temperature, so that a turbine disc forging without cracking and having good grain organization and excellent mechanical properties is obtained, however, the method improves the performance of the forging from the aspect of heat treatment.

[0005] Patent CN113458308A discloses a limit forming method of an ultra-large turbine disc forging, which forms the center part by pre-die forging and forms the edge part by final die forging, so that the shape and size of the forging meet the requirements, the design of the step-by-step forging reduces the forging load and improves the production efficiency of the press, but the method has high requirements for the die structure and the pressure of the equipment, and there are few presses in China that can meet the requirements.

[0006] The forging of large superalloy turbine disks generally adopts the free end + die forging method. In the forging process, the lower the deformation temperature, the greater the deformation resistance of the superalloy, the greater the contact area between the die and the material, and the greater the load borne by the press. However, the current forging method cannot avoid the above problems, and therefore, there is an urgent need to invent a new forging method to reduce the load borne by the press, meet the shape requirements, and manufacture a superalloy turbine disk without cracking and other defects. SUMMARY

[0007] To solve the above problems, the purpose of the present application is to provide a local forming manufacturing method of superalloy GH738 turbine disk, which can reduce the load borne by the press, avoid edge cracking, and obtain a nickel-based superalloy turbine disk forging with good microstructure and mechanical properties, thereby improving the utilization rate of equipment and reducing production costs.

[0008] Edge cracking is mainly caused by tensile stress, and flat plate compression can cause the material to form a drum shape due to friction and uneven temperature. The improved arc anvil, workpiece overturning, and rectangular anvil forging of the present application can naturally form a concave side surface of the workpiece, reduce the tensile stress of the edge during the final finish forming, and avoid cracking. The forging with good microstructure and mechanical properties is mainly due to the use of a series of process parameters from heating to forging and subsequent heat treatment processes, which can obtain the microstructure and properties of the final product.

[0009] Firstly, the cylindrical blank of superalloy GH738 (nickel-based superalloy) is heated and kept, then soft and hard sleeves are sequentially performed, and the blanked blank is heated and kept in an electric furnace (which reduces the speed of temperature drop of the blank and reduces the deformation resistance of the superalloy); after the blank is completely heated, upsetting process, arc anvil local rotary forging forming, and rectangular anvil local rotary forging forming are sequentially performed to obtain a forging, and finally the forging is sequentially subjected to solid solution treatment, stabilization treatment, and aging treatment to complete the local forming of superalloy GH738 turbine disk, thereby obtaining a forging with uniform microstructure and good performance. The local forming manufacturing method of superalloy GH738 turbine disk of the present application uses local deformation forging technology in the forging process, greatly reduces the contact area between the die and the material, and reduces the load borne by the press.

[0010] The purpose of the present application can be achieved by the following technical solutions:

[0011] The present application provides a local forming manufacturing method of superalloy GH738 turbine disk, comprising the following steps:

[0012] (1) Pretreatment: heating the cylindrical blank of superalloy GH738 in an electric furnace to obtain a first treated blank;

[0013] (2) soft package using thermal insulation cotton, then hard package using stainless steel plate, and then heating in an electric furnace to obtain a second processing blank;

[0014] (3) upsetting process: transferring the first processing blank obtained in step (2) to the press flat anvil with the same size as the upper flat anvil and the lower flat anvil for pressing, and then repeating the soft package heating process in step (2) after post-processing to obtain a third processing blank;

[0015] (4) arc anvil local rotation forging forming: transferring the third processing blank obtained in step (3) to the press flat anvil with the arc anvil head for one-time pressing, and then inverting the upper and lower surfaces for two-time pressing, and then repeating the soft package heating process in step (2) after post-processing to obtain a fourth processing blank;

[0016] (5) rectangular anvil local rotation forging forming: transferring the fourth processing blank obtained in step (4) to the press flat anvil with the rectangular anvil head for forging, and then obtaining the forged piece after post-processing;

[0017] (6) heat treatment process: first performing solid solution treatment on the forged piece obtained in step (5), then performing stabilization treatment, and finally performing aging treatment to complete the local forming of the superalloy GH738 turbine disc.

[0018] In an embodiment of the present application, in step (1), the heating temperature is 1030-1180℃ during the heating process, and the heating time is 10-15 hours.

[0019] In an embodiment of the present application, in step (2), the thickness of the thermal insulation cotton is 5-20mm, and the thickness of the stainless steel plate is 0.5-1.5mm.

[0020] In an embodiment of the present application, in step (2), the heating temperature is controlled at 1030-1180℃ during the heating process, and the holding time is 10-15h to make the blank uniformly heated, so as to reduce the thermal deformation resistance and effectively utilize the dynamic recovery and dynamic recrystallization in the deformation process, and at the same time, to eliminate the strong strengthening effect of the γ' phase as much as possible.

[0021] In an embodiment of the present application, in step (2), the post-processing is welding treatment at the joint.

[0022] In an embodiment of the present application, in step (3), the deformation amount of the height dimension is 25-35% during the pressing process, and the pressing time is 30s.

[0023] In one embodiment of the present invention, in step (3), the lower anvil of the press anvil is a turntable that can rotate during the forging process. The upper anvil and the lower anvil have the same dimensions but cannot rotate. A layer of insulation cotton is laid on the lower anvil, the secondary processed billet is placed in the middle of the lower anvil, and another layer of insulation cotton is laid on top of the secondary processed billet. The temperature of the mold is not lower than 350°C.

[0024] The post-processing involves removing the deformed and damaged outer sheath (insulation cotton).

[0025] In one embodiment of the present invention, in step (3), during the heating process of the sheath, the heating temperature is 1030-1180°C and the heating time is 2-3 hours.

[0026] In one embodiment of the present invention, in step (4), the radius of the arc of the upper anvil is 100-200mm, the angle between the side and the horizontal direction is 5-10°, the width is 200-400mm, and the length is 1.2-1.6 times that of the lower anvil. The entire pressing process is completed by the rotation of the lower anvil and the pressing process of the upper anvil.

[0027] During a single pressing process, the upper anvil presses down by 40-100mm, the lower anvil rotates by 10-15°, and the final deformation of the height dimension is 10-15%.

[0028] During the secondary pressing process, the pressing amount of the upper anvil is 40-100mm, the rotation angle of the lower anvil is 10-15°, and the final deformation of the height dimension is 10-15%.

[0029] In one embodiment of the present invention, in step (4), before pressing, the three-processed blanks are covered with thermal insulation cotton on both the top and bottom;

[0030] The post-processing involves removing the deformed and damaged outer sheath (insulation cotton).

[0031] In one embodiment of the present invention, in step (4), during the heating process of the sheath, the heating temperature is 1030-1180°C and the heating time is 2-3 hours.

[0032] In one embodiment of the present invention, in step (5), the width of the upper anvil is 200-400 mm and the length is 1.2-1.6 times that of the lower anvil. The forging of the entire area of ​​the billet is achieved by rotating the lower anvil.

[0033] During the forging process, the upper anvil reduces the material by 40-100 mm, the lower anvil rotates at an angle of 15°, and the final deformation of the local forming is 20-30%.

[0034] In one embodiment of the present invention, in step (5), before pressing, the blanks are covered with thermal insulation cotton on both the top and bottom.

[0035] The post-treatment involves removing the deformed and damaged outer sheath (insulation cotton) and air-cooling to room temperature.

[0036] In one embodiment of the present invention, in step (6), the temperature during the solution treatment is 1010-1080°C and the time is 3-5 hours; after the solution treatment, it is cooled to room temperature with water.

[0037] During the stabilization process, the temperature is 840–850℃ and the time is 3–5 hours; after stabilization, it is cooled to room temperature.

[0038] During the aging process, the temperature is 750-770℃ and the time is 15-17h; after the aging process, it is cooled to room temperature.

[0039] Compared with the prior art, the present invention has the following beneficial effects:

[0040] (1) This invention employs local deformation forging technology, which greatly reduces the load on the press; by using an arc-shaped upper anvil for initial forging and a rectangular anvil for final forging, the side bulging is significantly reduced; the use of a combination of soft and hard sheathing and heating and heat preservation provides high heat preservation performance and a long hot working time, increasing the operability of the process; the deformation amount of local forming is low, which can reduce edge cracks. In summary, this method has very obvious technical and economic benefits and significantly reduces the forming load of forgings.

[0041] (2) This invention has the characteristics of low equipment requirements, high production efficiency, convenient on-site operation, and good uniformity of forging structure, and has a wide range of application prospects. Attached Figure Description

[0042] Figure 1 This is a flowchart of a method for locally forming a turbine disk of high-temperature alloy GH738 according to the present invention;

[0043] Figure 2 This is a schematic diagram of the arc-shaped anvil structure used in Embodiment 1 of the present invention. Detailed Implementation

[0044] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0045] Unless otherwise specified, all reagents used in the following examples are commercially available, and the process conditions, detection methods and techniques used are conventional in the field.

[0046] Example 1

[0047] This embodiment provides a method for manufacturing a local forming of a high-temperature alloy GH738 turbine disk.

[0048] The billet used in this invention is made of high-temperature alloy GH738 material, with the following composition by mass percentage: C: 0.05%, Cr: 20%, Co: 13%, Mo: 4%, Al: 1.4%, Ti: 3%, B: 0.005%, Zr: 0.05%, Ni: balance.

[0049] The forging of large high-temperature alloy turbine disks using the above-mentioned alloy materials, with cylindrical blank dimensions of φ750×500mm, specifically includes the following steps (such as...). Figure 1 As shown):

[0050] (1) Pretreatment: The high-temperature alloy GH738 cylindrical billet is heated in an electric furnace at 1120℃ and held for 12 hours to ensure uniform heating of the billet and obtain a pretreated billet.

[0051] (2) Heating with a sleeve: The primary processed billet obtained in step (1) is wrapped with a soft sleeve using a 10mm thick insulating cotton, and then a 1mm thick stainless steel plate is used for a hard sleeve. The ends are not covered. After welding the connection on the side, it is placed in an electric furnace for heating. The heating temperature is controlled at 1120℃ and the holding time is 4h to obtain the secondary processed billet.

[0052] (3) Upsetting process: The primary processed billet obtained in step (2) is transferred to the press anvil with the same size as the upper and lower anvils for pressing. The lower anvil is a turntable with a diameter of 2500mm, which can rotate during the forging process. The upper anvil is a traditional flat hammer head larger than the alloy billet. A layer of 10mm thick thermal insulation cotton is laid on the lower anvil. The secondary processed billet is placed in the middle of the lower anvil. A layer of 10mm thick thermal insulation cotton is laid on top of the secondary processed billet. The temperature of the mold is not lower than 350℃.

[0053] Press the material using a press, control the deformation of the height dimension to 30%, hold the pressure for 30 seconds, remove the round cake blank, remove the deformed and damaged insulation cotton, and repeat the wrapping and heating process of step (2). The heating temperature is controlled at 1120℃ and the holding time is 3 hours to obtain the three-processed blank.

[0054] (4) Local rotational forging with an arc-shaped anvil: The three-stage processed billet obtained in step (3) is transferred to the upper anvil as an arc-shaped anvil (e.g., Figure 2As shown: The top arc radius is 150mm, the side angle with the horizontal direction is 8°, the width is 200mm, and the length is 3000mm) is pressed once on the flat anvil of the press (the lower anvil rotates, the upper anvil presses, the pressing amount of the upper anvil is 50mm each time, the rotation angle of the lower anvil is 15°, and the final deformation of the height dimension is controlled within 10%). After the first pressing is completed, the upper and lower surfaces are flipped over for a second pressing (the lower anvil rotates, the upper anvil presses, the pressing amount of the upper anvil is 50mm each time, the rotation angle of the lower anvil is 15°, and the final deformation of the height dimension is controlled within 10%). After taking it out, the wrapping heating process of step (2) is repeated. The heating temperature is controlled at 1120℃ and the holding time is 3h to obtain the four-time processed billet.

[0055] (5) Rectangular anvil local rotation forging: The four-processed billet obtained in step (4) is transferred to the middle of the press anvil. The upper and lower surfaces of the workpiece are flipped. The upper anvil head is replaced with a rectangular anvil head with a width of 200mm and a length of 3000mm. The forging of the entire area of ​​the forging is achieved by rotating the lower anvil head. A layer of 10mm thick heat insulation cotton is laid on the lower anvil head. A wider layer of heat insulation cotton is laid on the top of the four-processed billet to cover the upper surface of the billet that increases during the forging process. The temperature of the mold is not lower than 350℃. The pressing amount of the upper anvil head is 50mm each time, and the rotation angle of the lower anvil head is 15°. The final deformation of the local forming is controlled at 25%. After the forging is completed, it is removed, the outer heat insulation sleeve is removed, and it is air-cooled to room temperature to obtain the forging.

[0056] (6) Heat treatment process: The forging obtained in step (5) is first subjected to solution treatment, heated to 1040℃, held for 4 hours, and then water-cooled to room temperature after being taken out of the furnace; then stabilization treatment is performed, heated to 845℃, held for 4 hours, and then air-cooled to room temperature after being taken out of the furnace; finally aging treatment is performed, heated to 760℃, held for 16 hours, and then air-cooled to room temperature after being taken out of the furnace; the local forming of the high-temperature alloy GH738 turbine disk is completed.

[0057] Example 2

[0058] This embodiment provides a method for manufacturing a local forming of a high-temperature alloy GH738 turbine disk.

[0059] The billet used in this invention is made of high-temperature alloy GH738 material, with the following composition by mass percentage: C: 0.03%, Cr: 21%, Co: 12%, Mo: 5%, Al: 1.2%, Ti: 3.25%, B: 0.003%, Zr: 0.08%, Ni: balance.

[0060] The forging of large high-temperature alloy turbine disks using the above-mentioned alloy materials, with cylindrical blank dimensions of φ750×500mm, specifically includes the following steps (such as...). Figure 1 As shown):

[0061] (1) Pretreatment: The high-temperature alloy GH738 cylindrical billet is heated in an electric furnace at 1030℃ and held for 15 hours to ensure uniform heating of the billet and obtain a first-processed billet.

[0062] (2) Heating with a sleeve: The primary processed billet obtained in step (1) is wrapped with a 20mm thick insulation cotton for soft sleeve, and then a 0.5mm thick stainless steel plate is used for hard sleeve. The two ends are not sleeved. After welding the connection on the side, it is placed in an electric furnace for heating. The heating temperature is controlled at 1030℃ and the holding time is 6h to obtain the secondary processed billet.

[0063] (3) Upsetting process: The primary processed billet obtained in step (2) is transferred to the press anvil with the same size as the upper and lower anvils for pressing. The lower anvil is a turntable with a diameter of 2500mm, which can rotate during the forging process. The upper anvil is a traditional flat hammer head larger than the alloy billet. A layer of 20mm thick thermal insulation cotton is laid on the lower anvil. The secondary processed billet is placed in the middle of the lower anvil. A layer of 20mm thick thermal insulation cotton is laid on top of the secondary processed billet. The temperature of the mold is not lower than 350℃.

[0064] Press the material using a press, control the deformation of the height dimension to 25%, hold the pressure for 30 seconds, remove the round blank, remove the deformed and damaged insulation cotton, and repeat the wrapping and heating process of step (2). The heating temperature is controlled at 1030℃ and the holding time is 3 hours to obtain the three-processed blank.

[0065] (4) Local rotational forging of arc-shaped anvil: The three-stage processed billet obtained in step (3) is transferred to the flat anvil of a press with an arc-shaped anvil head (the top arc radius is 100mm, the side angle with the horizontal direction is 5°, the width is 250mm, and the length is 3000mm) for one pressing (the lower anvil head rotates, the upper anvil head presses, the pressing amount of the upper anvil head each time is 40mm, the rotation angle of the lower anvil head is 10°, and the final deformation of the height dimension is controlled at 12%). After the first pressing is completed, its upper and lower surfaces are flipped over for a second pressing (the lower anvil head rotates, the upper anvil head presses, the pressing amount of the upper anvil head each time is 40mm, the rotation angle of the lower anvil head is 10°, and the final deformation of the height dimension is controlled at 12%). After taking it out, the encasing heating process of step (2) is repeated. The heating temperature is controlled at 1030℃ and the holding time is 3h to obtain the four-stage processed billet.

[0066] (5) Rectangular anvil local rotation forging: The four-processed billet obtained in step (4) is transferred to the middle of the press anvil. The upper and lower surfaces of the workpiece are flipped. The upper anvil head is replaced with a rectangular anvil head with a width of 250mm and a length of 3000mm. The forging of the entire area of ​​the forging is achieved by rotating the lower anvil head. A layer of 20mm thick heat insulation cotton is laid on the lower anvil head. A wider layer of heat insulation cotton is laid on the top of the four-processed billet to cover the upper surface of the billet that increases during the forging process. The temperature of the mold is not lower than 350℃. The pressing amount of the upper anvil head is 40mm each time, and the rotation angle of the lower anvil head is 15°. The final deformation of the local forming is controlled at 20%. After the forging is completed, it is removed, the outer heat insulation sleeve is removed, and it is air-cooled to room temperature to obtain the forging.

[0067] (6) Heat treatment process: The forging obtained in step (5) is first subjected to solution treatment, heated to 1010℃, held for 5h, and then water-cooled to room temperature after being taken out of the furnace; then stabilization treatment is performed, heated to 840℃, held for 5h, and then air-cooled to room temperature after being taken out of the furnace; finally aging treatment is performed, heated to 750℃, held for 17h, and then air-cooled to room temperature after being taken out of the furnace; the local forming of the high-temperature alloy GH738 turbine disk is completed.

[0068] Example 3

[0069] This embodiment provides a method for manufacturing a local forming of a high-temperature alloy GH738 turbine disk.

[0070] The billet used in this invention is made of high-temperature alloy GH738 material, with the following composition by mass percentage: C: 0.1%, Cr: 18%, Co: 15%, Mo: 3.5%, Al: 1.6%, Ti: 2.75%, B: 0.01%, Zr: 0.02%, Ni: balance.

[0071] The forging of large high-temperature alloy turbine disks using the above-mentioned alloy materials, with cylindrical blank dimensions of φ750×500mm, specifically includes the following steps (such as...). Figure 1 As shown):

[0072] (1) Pretreatment: The high-temperature alloy GH738 cylindrical billet is heated in an electric furnace at 1180℃ and held for 10 hours to ensure uniform heating of the billet and obtain a pretreated billet.

[0073] (2) Heating with a sleeve: The primary processed billet obtained in step (1) is wrapped with a 5mm thick insulating cotton for soft sleeve, and then a 1.5mm thick stainless steel plate is used for hard sleeve. The two ends are not sleeved. After welding the connection on the side, it is placed in an electric furnace for heating. The heating temperature is controlled at 1180℃ and the holding time is 3h to obtain the secondary processed billet.

[0074] (3) Upsetting process: The primary processed billet obtained in step (2) is transferred to the press anvil with the same size as the upper and lower anvils for pressing. The lower anvil is a turntable with a diameter of 2500mm, which can rotate during the forging process. The upper anvil is a traditional flat hammer head larger than the alloy billet. A layer of 5mm thick thermal insulation cotton is laid on the lower anvil. The secondary processed billet is placed in the middle of the lower anvil. A layer of 5mm thick thermal insulation cotton is laid on top of the secondary processed billet. The temperature of the mold is not lower than 350℃.

[0075] Press the material using a press, control the deformation of the height dimension to 35%, hold the pressure for 30 seconds, remove the round blank, remove the deformed and damaged insulation cotton, and repeat the wrapping and heating process of step (2). The heating temperature is controlled at 1180℃ and the holding time is 2 hours to obtain the three-processed blank.

[0076] (4) Local rotation forging of arc-shaped anvil: The three-processed billet obtained in step (3) is transferred to the flat anvil of a press with an arc-shaped anvil head (the top arc radius is 200mm, the side angle with the horizontal direction is 10°, the width is 400mm, and the length is 3000mm) for one pressing (the lower anvil head rotates, the upper anvil head presses, the pressing amount of the upper anvil head each time is 100mm, the rotation angle of the lower anvil head is 12°, and the final deformation of the height dimension is controlled at 15%). After the first pressing is completed, its upper and lower surfaces are flipped over for a second pressing (the lower anvil head rotates, the upper anvil head presses, the pressing amount of the upper anvil head each time is 100mm, the rotation angle of the lower anvil head is 12°, and the final deformation of the height dimension is controlled at 15%). After taking it out, the encasing heating process of step (2) is repeated. The heating temperature is controlled at 1180℃ and the holding time is 2h to obtain the four-processed billet.

[0077] (5) Rectangular anvil local rotation forging: The four-processed billet obtained in step (4) is transferred to the middle of the press anvil. The upper and lower surfaces of the workpiece are flipped. The upper anvil head is replaced with a rectangular anvil head with a width of 400mm and a length of 3000mm. The forging of the entire area of ​​the forging is achieved by rotating the lower anvil head. A layer of 5mm thick heat insulation cotton is laid on the lower anvil head. A wider layer of heat insulation cotton is laid on the top of the four-processed billet to cover the upper surface of the billet that increases during the forging process. The temperature of the mold is not lower than 350℃. The pressing amount of the upper anvil head is 100mm each time. The rotation angle of the lower anvil head is 12°. The final deformation of the local forming is controlled at 30%. After the forging is completed, it is removed, the outer heat insulation sleeve is removed, and it is air-cooled to room temperature to obtain the forging.

[0078] (6) Heat treatment process: The forging obtained in step (5) is first subjected to solution treatment, heated to 1080℃, held for 3 hours, and then water-cooled to room temperature after being taken out of the furnace; then stabilization treatment is performed, heated to 850℃, held for 3 hours, and then air-cooled to room temperature after being taken out of the furnace; finally aging treatment is performed, heated to 770℃, held for 15 hours, and then air-cooled to room temperature after being taken out of the furnace; the local forming of the high-temperature alloy GH738 turbine disk is completed.

[0079] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the interpretation of the present invention, without departing from the scope of the invention, should be within the protection scope of the present invention.

Claims

1. A method for locally forming a turbine disk of high-temperature alloy GH738, characterized in that, Includes the following steps: (1) Pretreatment: The high-temperature alloy GH738 cylindrical billet is heated in an electric furnace to obtain a pretreated billet; (2) Heating with a sleeve: The primary processed billet obtained in step (1) is wrapped with a soft sleeve using insulating cotton, and then a hard sleeve is made using a stainless steel plate. After post-processing, it is placed in an electric furnace for heating to obtain a secondary processed billet. (3) Upsetting process: The first-processed billet obtained in step (2) is transferred to the press anvil with the same size as the upper and lower anvils for pressing. After post-processing, the wrapping heating process in step (2) is repeated to obtain the third-processed billet. (4) Local rotation forging of arc-shaped anvil: The three-processed billet obtained in step (3) is transferred to the press anvil with an arc-shaped anvil head for one pressing. After the first pressing is completed, its upper and lower surfaces are flipped for a second pressing. After post-processing, the cladding heating process in step (2) is repeated to obtain the four-processed billet. (5) Rectangular anvil local rotation forging: The four-processed billet obtained in step (4) is transferred to the press anvil with a rectangular anvil head for forging, and the forging is obtained after post-processing. (6) Heat treatment process: The forgings obtained in step (5) are first subjected to solution treatment, then to stabilization treatment, and finally to aging treatment to complete the local forming of the high temperature alloy GH738 turbine disk. In step (4), the radius of the upper anvil is 100-200mm, the angle between the side and the horizontal direction is 5-10°, the width is 200-400mm, and the length is 1.2-1.6 times that of the lower anvil. The entire pressing process is completed by rotating the lower anvil and pressing the upper anvil. During a single pressing process, the upper anvil presses down by 40-100mm, the lower anvil rotates by 10-15°, and the final deformation of the height dimension is 10-15%. During the secondary pressing process, the pressing amount of the upper anvil is 40-100mm, the rotation angle of the lower anvil is 10-15°, and the final deformation of the height dimension is 10-15%.

2. The method for partial forming of a high-temperature alloy GH738 turbine disk according to claim 1, characterized in that, In step (1), the heating temperature is 1030-1180℃ and the heating time is 10-15 hours.

3. The method for locally forming a high-temperature alloy GH738 turbine disk according to claim 1, characterized in that, In step (2), the thickness of the insulation cotton is 5-20mm and the thickness of the stainless steel plate is 0.5-1.5mm.

4. The method for partial forming of a high-temperature alloy GH738 turbine disk according to claim 1, characterized in that, In step (2), the heating temperature is 1030-1180℃ and the heating time is 3-6h.

5. The method for partial forming of a high-temperature alloy GH738 turbine disk according to claim 1, characterized in that, In step (3), during the pressing process, the deformation of the height dimension is 25-35%, and the pressing time is 30s.

6. The method for locally forming a high-temperature alloy GH738 turbine disk according to claim 1, characterized in that, In step (3), during the heating process of the sheath, the heating temperature is 1030-1180℃ and the heating time is 2-3h.

7. The method for partial forming of a high-temperature alloy GH738 turbine disk according to claim 1, characterized in that, In step (4), during the heating process of the sheath, the heating temperature is 1030-1180℃ and the heating time is 2-3h.

8. The method for locally forming a high-temperature alloy GH738 turbine disk according to claim 1, characterized in that, In step (5), the width of the upper anvil is 200-400mm and the length is 1.2-1.6 times that of the lower anvil. The forging of the entire area of ​​the billet is achieved by rotating the lower anvil. During the forging process, the upper anvil reduces the material by 40-100 mm, the lower anvil rotates at an angle of 15°, and the final deformation of the local forming is 20-30%.

9. The method for locally forming a high-temperature alloy GH738 turbine disk according to claim 1, characterized in that, In step (6), the solution treatment process is carried out at a temperature of 1010–1080℃ for 3–5 hours. During the stabilization process, the temperature is 840–850℃ and the time is 3–5 hours; During the aging process, the temperature is 750–770℃ and the time is 15–17 hours.

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