GH4586 high-temperature alloy ring forging and manufacturing method thereof

Abstract

The invention relates to the technical field of ring forge piece forging processes, and discloses a GH4586 high-temperature alloy ring forge piece and a manufacturing method of the GH4586 high-temperature alloy ring forge piece. S2, coating treatment is conducted on the rod-shaped blank, after the rod-shaped blank is heated to a first forging temperature, the rod-shaped blank is taken out to be subjected to hot sheathing treatment, upsetting and punching are conducted, and an annular blank is obtained; s3, the annular blank is subjected to coating treatment, after being heated to a second forging temperature, the annular blank is subjected to hot sheathing treatment, trestle reaming is conducted, and the end face is flattened; s4, coating treatment is carried out, after heating is carried out to a third forging temperature, hot sheathing treatment is carried out, rectangular rolling and / or special-shaped rolling are / is carried out, and the ring forge piece is obtained; the coating treatment is that the whole surface of the blank is coated with 2-5 layers of thermal insulation coating, the thermal wrapping is that the surface of the blank is covered with a thermal insulation material in a bonding mode, thermal wrapping is completed within 2 min, and the blank is subjected to thermal insulation for 60-180 min at the corresponding forging temperature. According to the method, the failure caused by cracking of the GH4586 high-temperature alloy in the forging process can be effectively prevented, and the manufacturing of the GH4586 high-temperature alloy ring forge piece is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of ring forging processes, and particularly to a GH4586 superalloy ring forging and a manufacturing method thereof. Background Art

[0002] The GH4586 superalloy is a Ni-Cr-Co-based precipitation-hardened deformed superalloy, which is a high-functional superalloy independently developed in China with intellectual property rights. The GH4586 superalloy has high-temperature strength, good oxidation resistance, corrosion resistance, and good processing and welding properties, and is mainly used in the manufacture of aerospace and other fields.

[0003] Since the GH4586 superalloy belongs to a difficult-to-deform material, it is prone to cracking and difficult to form during forging. At present, the products of the GH4586 superalloy are mainly used in the manufacture of disk forgings. For example, patent document CN110434275A discloses a forging method of the GH4586 superalloy. The method is as follows: Step 1, coat a high-temperature resistant glass coating on the surface of the original rod of the GH4586 superalloy to obtain a rod coated with the high-temperature resistant glass coating; Step 2, place the rod coated with the high-temperature resistant glass coating in an electric furnace for heating, and then place it in a finish forging die; Forge the finish forging die with the rod placed therein on an electric screw press to obtain a finish forging; Step 3, perform solution heat treatment on the finish forging in an electric furnace and then cool it; Step 4, perform aging heat treatment on the finish forging after solution heat treatment in an electric furnace, and then cool it to obtain a finished forging. The above method can accurately control the impact energy and the deformation amount of the forging, enabling the forging to achieve precise deformation, high dimensional consistency, and at the same time obtaining a more uniform organizational structure, and thus obtaining good mechanical properties. However, when the GH4586 superalloy material is forged into a large-size ring forging, such as when the inner diameter of the ring forging is greater than 600 mm and the wall thickness is more than 50 mm, a large deformation amount is often required during forging. Since the GH4586 superalloy is a difficult-to-deform material, it is prone to cracking and difficult to form during forging. How to adopt reasonable process parameters to ensure the deformation amount of the alloy during forging and meet the corresponding dimensional requirements has become a difficult problem to overcome. At present, the manufacture of GH4586 superalloy ring forgings is still blank. Therefore, how to solve the manufacturing problem of large-deformation ring forgings of the GH4586 alloy is the focus of current research. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems that the existing GH4586 superalloy ring forgings are prone to cracking and difficult to form during forging, and to provide a GH4586 superalloy ring forging and a manufacturing method thereof, which can realize the manufacture of GH4586 superalloy ring forgings through surface quality integrity control technology and forging forming control technology of forgings.

[0005] In a first aspect, the present invention provides a method for manufacturing a GH4586 superalloy ring forging, comprising the following steps: S1. Blanking: Obtain a bar-shaped blank according to the blanking requirements; S2. Coating treatment is performed on the bar-shaped blank. After the coating treatment, the bar-shaped blank is heated to a first forging temperature, and the first forging temperature is 1050 °C to 1100 °C; the heated bar-shaped blank is taken out for full-surface hot jacket treatment, and then upsetting and punching are performed to obtain an annular blank; S3. Coating treatment is performed on the annular blank obtained in step S2. After the coating treatment, the annular blank is heated to a second forging temperature, and the second forging temperature is 1050 °C to 1100 °C; the heated annular blank is taken out for the hot jacket treatment, and then a mandrel expansion and flat end face are performed; S4. Coating treatment is performed on the annular blank obtained in step S3. After the coating treatment, the annular blank is heated to a third forging temperature, and the second forging temperature is 1050 °C to 1100 °C; the heated annular blank is taken out for the hot jacket treatment, and then rectangular rolling and / or profiled rolling are performed to a set outer shape to obtain a ring forging; The method of the coating treatment: Apply 2 to 5 layers of heat-insulating coatings on the full surface of the bar-shaped blank or the annular blank. The method of the hot jacket treatment: Cover the surface of the bar-shaped blank or the annular blank with a heat-insulating material by bonding. The hot jacket process is completed within 2 minutes, and the bar-shaped blank or the annular blank after the jacket is completed is kept warm at the corresponding forging temperature for 60 minutes to 180 minutes.

[0006] In the technical solution of the present invention, a GH4586 superalloy bar is forged into a ring forging by upsetting, punching, mandrel expanding, rectangular rolling or special-shaped rolling. Before heating in each process, a coating treatment is carried out, and 2 to 5 layers of heat-insulating coatings are applied to the entire surface of the bar billet or ring billet, which can reduce the heat loss during heating, improve the heating efficiency, and at the same time ensure the temperature uniformity and stability of the billet during the subsequent forging process, avoiding forging defects caused by uneven temperature; after the bar billet or ring billet is heated to the corresponding forging temperature, it is taken out and the heat-insulating material is adhesively covered on the surface of the bar billet or the ring billet, so that a protective layer can be formed on the billet surface to prevent oxidation, decarburization and other phenomena from occurring due to the direct contact between the billet surface and the die or air during forging, and it is ensured to be completed within 2 minutes. The rapid operation further reduces the temperature loss of the billet, enables the forging to maintain sufficient temperature during the subsequent forging process, ensures the plasticity and deformation ability of the GH4586 superalloy material, and at the same time helps to eliminate the temperature gradient that may occur during the hot jacket process, making the internal temperature of the forging more uniform, thereby improving the forging quality. By adopting the coating treatment and hot jacket method, the surface temperature loss is reduced, and the integrity control of the forging surface quality is realized.

[0007] Through the above technical solution, the coating treatment, hot jacket treatment, forging temperature and forging process in the forming process cooperate with each other, reduce the surface temperature loss of the forging, ensure that the forging is formed within the forgeable temperature range, inhibit the cracking tendency of the forging during the forging process, effectively prevent the failure of the GH4586 superalloy caused by cracking during the forging process, realize the manufacture of GH4586 superalloy ring forgings, and fill the blank of the GH4586 alloy in the ring forging industry.

[0008] As a preferred solution of the present invention, the thickness of each layer of heat-insulating coating is 50 to 400 μm, and the total thickness of the heat-insulating coating is 0.2 to 1 mm. The thickness of the heat-insulating coating will affect its heat-insulating performance. Too thin a heat-insulating coating cannot achieve the heat-insulating effect. If the heat-insulating coating is too thick, it will increase the painting difficulty, prolong the painting time and affect the production efficiency. At the same time, too thick a heat-insulating coating may cause the jacket to be not tight during the hot jacket process, affecting the quality of the ring forging. In this application, the thickness of each layer of heat-insulating coating is controlled to be 50 to 400 μm, and the total thickness of the heat-insulating coating is 0.2 to 1 mm, which can provide better heat insulation effect, reduce the heat loss of the billet during heating and forging, maintain the temperature uniformity and stability of the billet, and is beneficial to improving the forging quality and production efficiency of the ring forging. By means of multi-layer painting, while ensuring the heat-insulating effect, the problems caused by too thick single-layer painting can be avoided, and the production efficiency and forging quality can be improved.

[0009] As a preferred embodiment of the present invention, the coating treatment is carried out by applying 2 to 3 layers of heat-insulating coatings on the surface of the rod-shaped blank or the ring-shaped blank. The thickness of each layer of the heat-insulating coating is 100 to 250 μm, and the total thickness of the heat-insulating coatings is 0.3 to 0.8 mm. In the above technical solution, applying 2 to 3 layers of heat-insulating coatings, with the thickness of each layer being 100 to 250 μm and the total thickness of the heat-insulating coatings being 0.3 to 0.8 mm, the thickness within this range can ensure the heat-insulating effect of the coatings and will not affect the operation convenience due to excessive thickness, so as to achieve the best heat-insulating and operation effects.

[0010] As a preferred embodiment of the present invention, during the coating treatment, the number of layers of the heat-insulating coating applied at the corners of the rod-shaped blank or the ring-shaped blank is greater than the number of layers of the heat-insulating coating applied on other surfaces of the rod-shaped blank or the ring-shaped blank. The corners of the rod-shaped blank or the ring-shaped blank are end faces or side faces with a width of 20 to 50 mm connected to the corners of the rod-shaped blank or the ring-shaped blank. Here, the end faces include the upper end face and the lower end face, and the side faces include the inner side face and the outer side face. Compared with other surfaces of the blank, heat is more likely to dissipate to the surrounding environment at the corners, resulting in a faster temperature drop. By increasing the number of layers of the heat-insulating coating at the corners, heat loss at the corners can be more effectively reduced. If the temperature at the corners is too low, the plasticity of the material at this part will decrease. Through the above settings, the temperature can be maintained to be uniform with the overall temperature of the blank, so as to avoid forging defects such as cracks and uneven deformation caused by too low local temperature during the subsequent forging process, improve the surface quality and dimensional accuracy of the forgings, help the ring forgings to obtain a uniform metallographic structure, and thus improve the comprehensive mechanical properties of the forgings such as strength and toughness, meeting the high-performance requirements of superalloy ring forgings in practical applications.

[0011] As a preferred embodiment of the present invention, in step S2, full upsetting is adopted, the downward pressing speed ≤ 15 mm / s, the upsetting amount each time ≤ 50 mm, and a pause of 2 to 3 s is made.

[0012] As a preferred embodiment of the present invention, in step S3, the downward pressing amount each time during the expanding with a mandrel is ≤ 10 mm.

[0013] As a preferred embodiment of the present invention, in step S3, the deformation amount per heat during the flat-end face process is 15% - 23%.

[0014] As a preferred embodiment of the present invention, in step S4, during the rectangular rolling or special-shaped rolling process, the rolling speed is 3 to 6 mm / s, and the rectangular pre-rolling is carried out through at least one heat. The deformation amount per heat during the rolling is 20% - 26%. Adjusting the forging deformation amount and deformation rate per heat makes the internal stress of the forgings more evenly distributed, prevents abnormal growth of some grains during the forging process, and improves the quality of the ring forgings.

[0015] As a preferred embodiment of the present invention, the heat-insulating coating is a water-based glass coating. The solid content of the water-based glass coating is 50-60%, the pH is 7.0-9.0, and the viscosity is 2000-3500 CPS. The water-based glass coating uses water as a solvent and does not release harmful gases during use, being environmentally friendly. The water-based glass coating can form a dense heat-insulating layer on the surface of the blank, effectively reducing heat dissipation, maintaining the temperature uniformity of the blank during forging, controlling the solid content, pH value, and viscosity, which helps to improve the forging quality and production efficiency.

[0016] As a preferred embodiment of the present invention, the heat-insulating material is heat-insulating asbestos with a thickness of 5-20 mm. The forging temperature of the superalloy is relatively high. Heat-insulating asbestos has excellent heat-insulating effects, can effectively reduce heat dissipation of the superalloy blank during heating and forging, maintain the temperature uniformity and stability of the blank, ensure the plasticity and deformation ability of the material, and heat-insulating asbestos can maintain its stable performance in a high-temperature environment and will not decompose or fail due to high temperature, ensuring reliable heat-insulating effects throughout the forging process. At the same time, heat-insulating asbestos is soft in texture and has a certain plasticity, facilitating coating and fixing on the surface of the blank. The thickness of 5-20 mm of heat-insulating asbestos can reasonably control costs while ensuring good heat-insulating effects.

[0017] In a second aspect, the present invention provides a manufacturing method for a GH4586 superalloy ring forging, and the ring forging is manufactured by the above manufacturing method.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention provides a manufacturing method for a GH4586 superalloy ring forging. The GH4586 superalloy bar is forged into a ring forging through upsetting, punching, ring rolling with a ring roll or special-shaped rolling. During the forming process, the coating treatment, hot jacket treatment, forging temperature, and forging process cooperate with each other, reducing the surface temperature loss of the forging, ensuring that the forging is formed within the forgeable temperature range, suppressing the cracking tendency of the forging during the forging process, effectively preventing the failure of the GH4586 superalloy caused by cracking during forging, avoiding product rejection, improving the forging qualification rate, reliability, and service life of the product, thereby reducing the overall cost.

[0019] 2. The present invention provides a GH4586 superalloy ring forging. The mechanical properties of the ring forgings prepared by the present invention all meet the corresponding index requirements. Among them, at 750 °C, the tensile strength ≥ 1151 MPa, the yield strength ≥ 940 MPa, the elongation ≥ 14.5%, the reduction of area ≥ 25.5%, the creep strength is 520 MPa, and the creep time ≥ 67 h; at 800 °C, the tensile strength ≥ 983 MPa, the yield strength ≥ 822 MPa, the elongation ≥ 13.2%, the reduction of area ≥ 29.2%, the creep strength is 400 MPa, and the creep time ≥ 34 h. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic cross-sectional view of the annular blank in Embodiment 1 of the present invention; Figure 2 It is a drawing of the ring forging obtained by manufacturing the present invention; Figure 3 It is a schematic cross-sectional view of the ring forging with a flange structure in Embodiment 3 of the present invention; Markings in the figure: 1 - Ring forging, 11 - Upper end face, 12 - Lower end face, 13 - Inner side face, 14 - Outer side face, 15 - Edge angle, 2 - Ring forging with a flange structure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0021] The present invention will be further described in detail below in conjunction with specific embodiments. However, this should not be construed as limiting the scope of the above-mentioned subject matter of the present invention to the following embodiments. All technologies implemented based on the content of the present invention belong to the scope of the present invention.

[0022] In the description of the specific embodiments of the present invention, without special explanation, the expression terms indicating the orientation or positional relationship such as "upper", "lower", "left", "right", "center", "inner", "outer", etc. are all based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the invention product / equipment / device is usually used and placed. These orientation or positional relationship terms are only for the convenience of describing the solution of the present invention or simplifying the description in the specific embodiments, so as to facilitate technicians to quickly understand the solution, rather than indicating or implying that a specific device / component / element must have a specific orientation, or be constructed and operated in a specific positional relationship. Therefore, it should not be construed as a limitation to the present invention.

[0023] In addition, when terms such as "horizontal", "vertical", "hanging", "parallel" appear, it does not mean that the corresponding device / component / element is required to be absolutely horizontal or vertical or hanging or parallel, but it can be slightly inclined or have a deviation. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and it does not mean that the structure must be completely horizontal, but it can be slightly inclined. Or, it can be simply understood that the corresponding device / component / element is arranged in directions such as "horizontal", "vertical", "hanging", "parallel", etc., and can have an error / deviation of ±10% relative to the corresponding direction setting, more preferably an error / deviation within ±8%, more preferably an error / deviation within ±6%, more preferably an error / deviation within ±5%, more preferably an error / deviation within ±4%. As long as the corresponding device / component / element is within the error / deviation range, it can still achieve its function in the solution of the present invention.

[0024] In addition, when expressions such as "first", "second", "third", etc. appear in the terms, they are only used to distinguish the description of the same or similar components, and should not be understood as emphasizing or implying the relative importance of specific components.

[0025] In addition, in the description of the embodiments of the present invention, "several", "multiple", "a number of" represent at least 2. It can be any situation such as 2, 3, 4, 5, 6, 7, 8, 9, etc., and even can be a situation of more than 9.

[0026] In addition, in the description of the technical solution of the present invention, unless otherwise clearly specified / defined / limited, when terms such as "set", "installed", "connected", "connected", "provided with", "laid", "arranged" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be connection means commonly used in the art such as welding, riveting, bolting, threaded connection, etc. Such a connection can be a mechanical connection, an electrical connection or a communication connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements.

[0027] Embodiment 1 This embodiment provides a GH4586 superalloy ring forging, and the manufacturing method of the ring forging includes the following steps: S1. Blanking: Obtain a rod-shaped blank according to the blanking requirements.

[0028] S2. Coating the rod-shaped blank, applying 2 to 5 layers of heat-insulating coating on the entire surface of the rod-shaped blank, with the thickness of each layer of heat-insulating coating being 50 - 400 μm and the total thickness of the heat-insulating coating being 0.2 - 1 mm; the number of layers of heat-insulating coating applied at the corners of the rod-shaped blank or ring-shaped blank is greater than that applied on other surfaces of the rod-shaped blank or ring-shaped blank. The corners of the rod-shaped blank or ring-shaped blank refer to the end faces or side faces with a width of 20 - 50 mm connected to the corners of the rod-shaped blank or ring-shaped blank. In this embodiment, the ring-shaped blank obtained through step S2 is as Figure 1 shown. Here, the end faces include the upper end face 11 and the lower end face 12, and the side faces include the inner side face 13 and the outer side face 14. The corner 15 of the ring-shaped blank refers to the position where the two end faces of the ring-shaped blank intersect with the inner side face and the outer side face to form a corner. When preparing some ring forgings with special shapes or structures, such as ring forgings with bosses, grooves or other complex shapes, the corners may appear at the positions where these special shapes intersect with the main body of the ring forging. The thickness of the heat-insulating coating at the corners should be greater than that on other surfaces of the blank.

[0029] The coated rod-shaped blank is heated to the first forging temperature, and the first forging temperature is 1050°C - 1100°C; Take out the heated rod-shaped blank for full-surface hot jacket treatment, cover the entire surface of the rod-shaped blank with the heat-insulating material through bonding. The hot jacket process is completed within 2 minutes, and the coated rod-shaped blank is kept warm at the corresponding first forging temperature for 60 - 180 minutes, and then upset and punched to obtain a ring-shaped blank; among them, the upsetting is carried out by integral upsetting, the downward pressure speed ≤ 15 mm / s, the upsetting amount each time ≤ 50 mm, and a pause of 2 - 3 s is made.

[0030] S3. Coating the ring-shaped blank obtained in step S2, applying 2 to 5 layers of heat-insulating coating on the entire surface of the ring-shaped blank.

[0031] The coated ring-shaped blank is heated to the second forging temperature, and the second forging temperature is 1050°C - 1100°C; take out the heated ring-shaped blank for hot jacket treatment, cover the entire surface of the ring-shaped blank with the heat-insulating material through bonding. The hot jacket process is completed within 2 minutes, and the coated ring-shaped blank is kept warm at the second forging temperature for 60 - 180 minutes, and then carry out cross wedge rolling expansion and flat end face; the downward pressure amount each time for cross wedge rolling expansion ≤ 10 mm, and the deformation amount per heating during the flat end face process is 15% - 23%.

[0032] S4. Coating treatment is performed on the annular blank obtained in step S3. 2 to 5 layers of heat-insulating coatings are applied to the entire surface of the annular blank. After the coating treatment, the annular blank is heated to the third forging temperature, and the second forging temperature is 1050°C to 1100°C. The heated annular blank is taken out for hot jacket treatment. The heat-insulating material is adhesively covered on the entire surface of the annular blank. The hot jacket process is completed within 2 minutes, and the annular blank after the jacket is completed is kept warm at the third forging temperature for 60 minutes to 180 minutes, and then rectangular rolling and / or profiled rolling is carried out to the set shape and size to obtain a ring forging. Among them, the rolling speed during rectangular rolling or profiled rolling is 3 to 6 mm / s. Rectangular rolling is carried out through at least one heating pass, and profiled rolling is carried out through at least one heating pass. The deformation amount per heating pass during rectangular rolling or profiled rolling is 20% to 26%. The above coating treatment is carried out before each heating, and hot jacket treatment is carried out after heating and heat preservation.

[0033] The heat-insulating coating is a water-based glass coating. The solid content of the water-based glass coating is 50% to 60%, the pH is 7.0 to 9.0, and the viscosity (@ 25 0 C) is 2000 to 3500 CPS. In this embodiment, the number of layers and the total thickness of the heat-insulating coating used in the coating treatments in steps S2, S3, and S4 can be the same or different. In the specific application process, it is adjusted within the range of 0.2 to 1 mm for the total thickness of the heat-insulating coating according to the forging situation of the blank. The heat-insulating material used is heat-insulating asbestos with a thickness of 5 to 20 mm.

[0034] Example 2 This embodiment provides a GH4586 superalloy ring forging. Using the manufacturing method of Example 1, the ring forging is a ring forging with a rectangular cross-section, with an inner diameter of 850 mm, an outer diameter of 1000 mm, and a height of 500 mm. The manufacturing method is as follows: S1. Blanking: Wire cutting or a sawing machine is used for blanking. The blanking size is calculated according to the size of the ring forging to obtain a bar-shaped blank.

[0035] S2. Coating treatment is performed on the bar-shaped blank. In this embodiment, a commercially available water-based glass coating, model ATP-610 or Oxylub-811, is used. After each coating, it is air-dried and then coated again.

[0036] The rod-shaped blank after coating treatment is heated to the first forging temperature, and the first forging temperature is 1050°C to 1100°C; the heated rod-shaped blank is kept warm for an appropriate time until the rod-shaped blank is thermally penetrated, and then taken out of the furnace immediately for full-surface hot jacket. The heat-insulating asbestos is bonded and covered on the full surface of the rod-shaped blank through a high-temperature binder. The hot jacket process is completed within 2 minutes, and the rod-shaped blank after the jacket is completed is returned to the furnace and kept warm at the corresponding first forging temperature for 60 minutes to 180 minutes, and then upset and punched to obtain an annular blank; among them, the upsetting is carried out by integral upsetting, the downward pressure speed is ≤15 mm / s, the upsetting amount each time is ≤50 mm, and it pauses for 2 to 3 seconds, and then a punch with a corresponding size is used for punching. The size of the punch is usually 0.3 to 0.5 times the outer diameter after upsetting.

[0037] S3. The annular blank obtained in step S2 is subjected to coating treatment. 3 layers of heat-insulating coatings are applied to the corners of the annular blank, and 2 layers of heat-insulating coatings are applied to other places of the annular blank. The thickness of each layer of heat-insulating coating is 100 to 250 μm, and the total thickness of the heat-insulating coating is 0.3 to 0.8 mm; The annular blank after coating treatment is heated to the second forging temperature, and the second forging temperature is 1050°C to 1100°C; the heated annular blank is taken out for hot jacket treatment. The heat-insulating asbestos is bonded and covered on the full surface of the annular blank through a high-temperature binder. The hot jacket process is completed within 2 minutes, and the annular blank after the jacket is completed is kept warm at the second forging temperature for 60 minutes to 180 minutes, and then a mandrel expansion and flat end face are carried out; the annular blank is mandrel-expanded to the corresponding size, the downward pressure amount each time for mandrel expansion is ≤10 mm. Immediately after the mandrel expansion is completed, the surface condition of the forging is checked. When there are no defects visible to the naked eye, the integral flat end face can be carried out immediately. The deformation amount for each heat treatment of mandrel expansion and flat end face is 15% to 23%; S4. The annular blank obtained in step S3 is subjected to coating treatment. 3 layers of heat-insulating coatings are applied to the corners of the annular blank, and 2 layers of heat-insulating coatings are applied to other places of the annular blank. The thickness of each layer of heat-insulating coating is 100 to 250 μm, and the total thickness of the heat-insulating coating is 0.3 to 0.8 mm; The annular blank after coating treatment is heated to the third forging temperature, and the second forging temperature is 1050°C to 1100°C; the heated annular blank is taken out for hot jacket treatment. The heat-insulating asbestos is bonded and covered on the entire surface of the annular blank through a high-temperature binder. The hot jacket process is completed within 2 minutes, and the annular blank after the jacket is completed is kept warm at the third forging temperature for 60 minutes to 180 minutes, and then rectangular rolling and special-shaped rolling are carried out to the set shape and size to obtain a ring forging; wherein the rolling speed during rectangular rolling or special-shaped rolling is 3 to 6 mm / s, rectangular rolling is carried out through at least one heating pass, special-shaped rolling is carried out through at least one heating pass, and the deformation amount per heating pass during rectangular rolling or special-shaped rolling is 20% to 26%. The above-mentioned coating treatment is carried out before heating for each heating pass, and hot jacket treatment is carried out after heating and heat preservation.

[0038] Comparative Example 1 This comparative example provides a GH4586 superalloy ring forging. The size and preparation method of the ring forging are the same as those in Example 2, except that no coating treatment is carried out before heating in steps S2, S3, and S4, and it specifically includes the following steps: S1. Blanking: Use wire cutting or a sawing machine for blanking, calculate the blanking size according to the size of the ring forging to obtain a bar-shaped blank.

[0039] S2. Heat the bar-shaped blank to the first forging temperature, and the first forging temperature is 1050°C to 1100°C; keep the heated bar-shaped blank warm for an appropriate time until the bar-shaped blank is thermally penetrated, then immediately take it out of the furnace for hot jacket of the entire surface. The heat-insulating asbestos is bonded and covered on the entire surface of the bar-shaped blank through a high-temperature binder. The hot jacket process is completed within 2 minutes, and the bar-shaped blank after the jacket is completed is returned to the furnace and kept warm at the corresponding first forging temperature for 60 minutes to 180 minutes, and then upsetting and punching are carried out to obtain an annular blank; wherein the upsetting is carried out by integral upsetting, the downward pressing speed ≤ 15 mm / s, the upsetting amount per time ≤ 50 mm, and it pauses for 2 to 3 s, and then punching is carried out with a punch of the corresponding size. The size of the punch is usually 0.3 to 0.5 times the outer diameter after upsetting.

[0040] S3. Heat the ring blank obtained in step S2 to the second forging temperature, which is 1050°C to 1100°C; take out the heated ring blank for hot jacket treatment, bond and cover the whole surface of the ring blank with heat-insulating asbestos through a high-temperature binder. The hot jacket process is completed within 2 minutes, and the ring blank after the jacket is completed is kept warm at the second forging temperature for 60 minutes to 180 minutes, and then perform cross wedge rolling and flat end facing; expand the ring blank by cross wedge rolling to the corresponding size, with the downward pressure per pass of cross wedge rolling ≤ 10 mm. Immediately check the surface condition of the forging after cross wedge rolling. When there are no defects visible to the naked eye, flat end facing can be carried out immediately. The deformation per heat for cross wedge rolling and flat end facing is 15% to 23%; S4. Heat the ring blank obtained in step S3 to the third forging temperature, which is 1050°C to 1100°C; take out the heated ring blank for hot jacket treatment, take out the heated ring blank for hot jacket treatment, bond and cover the whole surface of the ring blank with heat-insulating asbestos through a high-temperature binder. The hot jacket process is completed within 2 minutes, and the ring blank after the jacket is completed is kept warm at the third forging temperature for 60 minutes to 180 minutes, and then perform rectangular rolling and special-shaped rolling to the set shape and size to obtain a ring forging; where the rolling speed during rectangular rolling or special-shaped rolling is 3 to 6 mm / s, rectangular rolling is carried out through at least one heat, special-shaped rolling is carried out through at least one heat, the deformation per heat during rectangular rolling or special-shaped rolling is 20% to 26%, and the above-mentioned coating treatment is carried out before heating for each heat, and hot jacket treatment is carried out after heating and heat preservation.

[0041] Comparative Example 2 This comparative example provides a GH4586 superalloy ring forging. The size and preparation method of the ring forging are the same as those in Example 2, except that no hot jacket treatment is carried out during the heating process in steps S2, S3, and S4, which specifically includes the following steps: S1. Blanking: Use wire cutting or a sawing machine for blanking, calculate the blanking size according to the size of the ring forging to obtain a bar-shaped blank.

[0042] S2. Perform coating treatment on the bar-shaped blank. In this example, a commercially available water-based glass coating with the model ATP-610 or Oxylub-811 is used. After each coating, it is air-dried and then coated again.

[0043] Heat the bar-shaped blank after coating treatment to the first forging temperature, which is 1050°C to 1100°C; then perform upsetting and punching to obtain a ring blank; where upsetting is carried out by integral upsetting, the downward pressure speed ≤ 15 mm / s, the upsetting amount per time ≤ 50 mm, and it pauses for 2 to 3 s, and then use a punch with the corresponding size for punching. The size of the punch is usually 0.3 to 0.5 times the outer diameter after upsetting.

[0044] S3. Apply coating treatment to the ring blank obtained in step S2. Apply 3 layers of heat-insulating coating to the edges and corners of the ring blank, and apply 2 layers of heat-insulating coating to other parts of the ring blank. The thickness of each layer of heat-insulating coating is 100 - 250 μm, and the total thickness of the heat-insulating coating is 0.3 - 0.8 mm; Heat the ring blank after coating treatment to the second forging temperature, and the second forging temperature is 1050°C - 1100°C; then perform mandrel expanding and flat-end facing; expand the ring blank by mandrel to the corresponding size, and the downward pressure per time during mandrel expanding ≤ 10 mm. Immediately check the surface condition of the forging after mandrel expanding. When there are no visible defects to the naked eye, flat-end facing of the whole can be carried out immediately. The deformation amount per heating for mandrel expanding and flat-end facing is 15% - 23%; S4. Apply coating treatment to the ring blank obtained in step S3. Apply 3 layers of heat-insulating coating to the edges and corners of the ring blank, and apply 2 layers of heat-insulating coating to other parts of the ring blank. The thickness of each layer of heat-insulating coating is 100 - 250 μm, and the total thickness of the heat-insulating coating is 0.3 - 0.8 mm; Heat the ring blank after coating treatment to the third forging temperature, and the second forging temperature is 1050°C - 1100°C; then perform rectangular rolling and special-shaped rolling to the set shape and size to obtain a ring forging; wherein the rolling speed during rectangular rolling or special-shaped rolling is 3 - 6 mm / s. Rectangular rolling is carried out through at least one heating, and special-shaped rolling is carried out through at least one heating. The deformation amount per heating during rectangular rolling or special-shaped rolling is 20% - 26%. Perform the above coating treatment before each heating, and perform hot jacket treatment after heating and heat preservation.

[0045] Test Example 1 Perform appearance inspection on the ring forgings prepared in the above Example 2, Comparative Example 1, and Comparative Example 2, record the number and length of cracks, and the test results are shown in Table 1.

[0046] Table 1 Appearance inspection results of ring forgings prepared in Example 2 and Comparative Examples 1 - 2

[0047] According to the above results, it can be seen that for the GH4586 ring forgings produced according to the above steps, the surface quality of the final product is good, and no obvious cracks, pits, etc. are seen. As Figure 2 shown. The product dimensions meet the corresponding design requirements, and no warping, corner collapse, etc. are seen, and it can be processed during subsequent machining. The product is qualified. However, the GH4586 ring forgings in Comparative Example 1 and Comparative Example 2 have more cracks. The crack positions appear at the edges and corners of the upper end face or lower end face of the ring forging, and the cracks are deeper, greater than 5 mm, and cannot be processed during subsequent machining, resulting in unqualified products. There are also defects such as pits, warping, or corner collapse.

[0048] Test Example 2 The qualified GH4586 ring forgings in terms of appearance in Example 2 were sampled from the body, and the high-temperature tensile properties and creep properties at 750 °C and 800 °C were respectively tested. The test results are shown in Table 2. It can be seen from Table 1 that for the GH4586 ring forgings produced according to the above steps, the mechanical properties of the final products all meet the corresponding index requirements, and there is a certain margin, and the product properties are all qualified.

[0049] Table 2 Test Results of Mechanical Properties of GH4586 Ring Forgings in Example 2

[0050] Example 3 This example provides a GH4586 superalloy ring forging. The ring forging is a ring forging with a flange structure, as Figure 3 shown. The manufacturing method of Example 1 is adopted, and the specific manufacturing method is as follows: S1. Blanking: Use wire cutting or a sawing machine for blanking. Calculate the blanking size according to the size of the ring forging to obtain a bar-shaped blank.

[0051] S2. Coating treatment is carried out on the bar-shaped blank. In this example, a commercially available water-based glass coating with the model ATP-610 or Oxylub-811 is used. After each coating, air drying is carried out, and then coating is carried out again.

[0052] The bar-shaped blank after coating treatment is heated to the first forging temperature, and the first forging temperature is 1050 °C to 1100 °C; the heated bar-shaped blank is kept warm for an appropriate time until it is thermally penetrated, and then immediately taken out of the furnace for full-surface hot jacket. The heat-insulating asbestos is bonded and covered on the full surface of the bar-shaped blank through a high-temperature binder. The hot jacket process is completed within 2 minutes, and the bar-shaped blank after the jacket is completed is returned to the furnace and kept warm at the corresponding first forging temperature for 60 minutes to 180 minutes, and then upsetting and punching are carried out to obtain a ring-shaped blank; among them, integral upsetting is adopted for upsetting, the downward pressure speed ≤ 15 mm / s, the upsetting amount each time ≤ 50 mm, and it pauses for 2 to 3 s, and then punching is carried out with a punch of corresponding size. The punch size is usually 0.3 to 0.5 * the outer diameter after upsetting.

[0053] S3. Coating treatment is carried out on the ring-shaped blank obtained in step S2. The corners of the ring-shaped blank are coated with 3 layers of heat-insulating coating, and the other parts of the ring-shaped blank are coated with 2 layers of heat-insulating coating. The thickness of each layer of heat-insulating coating is 100 to 250 μm, and the total thickness of the heat-insulating coating is 0.3 to 0.8 mm; The ring blank after coating treatment is heated to the second forging temperature, and the second forging temperature is 1050°C to 1100°C; the heated ring blank is taken out for hot jacket treatment, and heat-insulating asbestos is bonded and covered on the entire surface of the ring blank through a high-temperature binder. The hot jacket process is completed within 2 minutes, and the ring blank after the jacket is completed is kept warm at the second forging temperature for 60 minutes to 180 minutes, and then it is subjected to cage expanding and flat end facing; the ring blank is cage-expanded to the corresponding size, and the downward pressure per time of cage expanding is ≤10 mm. Immediately after cage expanding, the surface condition of the forging is inspected. When there are no defects visible to the naked eye, the overall flat end facing can be carried out immediately. The deformation amount per heat for cage expanding and flat end facing is 15% to 23%; S4. The ring blank obtained in step S3 is subjected to coating treatment. Three layers of heat-insulating coating are applied to the corners of the ring blank, and two layers of heat-insulating coating are applied to other places of the ring blank. The thickness of each layer of heat-insulating coating is 100 to 250 μm, and the total thickness of the heat-insulating coating is 0.3 to 0.8 mm; The ring blank after coating treatment is heated to the third forging temperature, and the second forging temperature is 1050°C to 1100°C; the heated ring blank is taken out for hot jacket treatment, and heat-insulating asbestos is bonded and covered on the entire surface of the ring blank through a high-temperature binder. The hot jacket process is completed within 2 minutes, and the ring blank after the jacket is completed is kept warm at the third forging temperature for 60 minutes to 180 minutes, and then it is subjected to rectangular rolling and profile rolling to the set shape and size to obtain a ring forging; wherein the rolling speed during rectangular rolling or profile rolling is 3 to 6 mm / s. Rectangular rolling is carried out through at least one heat, and profile rolling is carried out through at least one heat. The deformation amount per heat during rectangular rolling or profile rolling is 20% to 26%. The above-mentioned coating treatment is carried out before heating and insulation for each heat, and hot jacket treatment is carried out after heating and insulation. The manufactured ring forging with a flange structure has a good appearance and its mechanical properties meet the requirements.

[0054] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A manufacturing method of a GH4586 superalloy ring forging, characterized in that, It includes the following steps: S1. Blanking: Obtain a rod-shaped blank according to the blanking requirements; S2. Coating the rod-shaped blank, heating the coated rod-shaped blank to the first forging temperature, where the first forging temperature is 1050 - 1100 °C; taking out the heated rod-shaped blank for full-surface hot jacket treatment, and then performing upsetting and punching to obtain an annular blank; S3. Coating the annular blank obtained in step S2, heating the coated annular blank to the second forging temperature, where the second forging temperature is 1050 - 1100 °C; taking out the heated annular blank for the hot jacket treatment, and then performing mandrel expanding and flat end facing; S4. Coating the annular blank obtained in step S3, heating the coated annular blank to the third forging temperature, where the second forging temperature is 1050 - 1100 °C; taking out the heated annular blank for the hot jacket treatment, and then performing rectangular rolling and / or special-shaped rolling to the set shape to obtain a ring forging; The method of the coating treatment: Brush 2 - 5 layers of heat-insulating coating on the full surface of the rod-shaped blank or the annular blank. The method of the hot jacket treatment: Cover the surface of the rod-shaped blank or the annular blank with heat-insulating material by bonding. The hot jacket process is completed within 2 minutes, and the coated rod-shaped blank or annular blank is kept warm at the corresponding forging temperature for 60 - 180 minutes.

2. The manufacturing method of the GH4586 superalloy ring forging according to claim 1, wherein, The thickness of each layer of heat-insulating coating is 50 - 400 μm, and the total thickness of the heat-insulating coating is 0.2 - 1 mm.

3. The manufacturing method of the GH4586 superalloy ring forging according to claim 1, characterized in that, The coating treatment is carried out by brushing 2 - 3 layers of heat-insulating coating on the surface of the rod-shaped blank or the annular blank. The thickness of each layer of heat-insulating coating is 100 - 250 μm, and the total thickness of the heat-insulating coating is 0.3 - 0.8 mm.

4. The manufacturing method of the GH4586 superalloy ring forging according to claim 1, characterized in that, During the coating treatment, the number of layers of heat-insulating coating brushed at the corners of the rod-shaped blank or the annular blank is greater than that brushed on other surfaces of the rod-shaped blank or the annular blank. The corners of the rod-shaped blank or the annular blank are end faces or side faces with a width of 20 - 50 mm connected to the corners of the rod-shaped blank or the annular blank.

5. The manufacturing method of the GH4586 superalloy ring forging according to claim 1, characterized in that, In step S2, overall upsetting is adopted, the downward pressing speed ≤ 15 mm / s, the upsetting amount each time ≤ 50 mm, and a pause of 2 - 3 s is made; the downward pressing amount each time during mandrel expanding ≤ 10 mm.

6. The manufacturing method of the GH4586 superalloy ring forging according to claim 1, characterized in that, In step S3, the deformation amount per heat during flat end facing is 15 - 23%.

7. The manufacturing method of the GH4586 superalloy ring forging according to claim 1, characterized in that, In step S4, the rolling speed during rectangular rolling or special-shaped rolling is 3 - 6 mm / s. Rectangular pre-rolling is carried out through at least one heat, and the deformation amount per heat during rolling is 20 - 26%.

8. The manufacturing method of the GH4586 superalloy ring forging according to any one of claims 1-7, characterized in that, The heat-insulating coating is a water-based glass coating. The solid content of the water-based glass coating is 50 - 60%, the pH is 7.0 - 9.0, and the viscosity is 2000 - 3500 CPS.

9. The manufacturing method of the GH4586 superalloy ring forging according to any one of claims 1-7, characterized in that, The heat-insulating material is heat-insulating asbestos with a thickness of 5 - 20 mm.

10. A GH4586 superalloy ring forging, characterized in that, The ring forging is manufactured by using the manufacturing method of the GH4586 superalloy ring forging according to any one of claims 1 - 9.

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