Method for reducing the resistance of a high-temperature alloy during cogging and upsetting

Abstract

The application discloses a method for reducing the resistance of a high-temperature alloy during a cogging-up process, and belongs to the technical field of deformed high-temperature alloys. The method comprises the following steps: firstly, performing a heating treatment on a sample of the high-temperature alloy before cogging; and then, performing a cogging-up treatment. When the resistance of the sample approaches the bearing limit of equipment during the cogging-up process, the cogging-up process is paused, and then the cogging-up process is performed again. Whether the sample reaches a deformation amount is judged. If the sample reaches the required deformation amount, the cogging-up process is stopped. If the sample does not reach the required deformation amount but reaches the bearing limit of the equipment, the sample needs to pause the cogging-up process again, and then the sample performs the cogging-up process again to obtain the required forged high-temperature alloy material. The application reduces the deformation resistance through a short pause after hot deformation close to the bearing limit of a quick forging machine, increases the deformation amount after hot deformation, and obtains the required deformation amount.

Description

Technical Field

[0001] This invention belongs to the technical field of wrought high-temperature alloys and relates to a method for reducing the resistance during the upsetting process of high-temperature alloy billets. Background Technology

[0002] With the increasing application of wrought superalloys in aerospace, heavy-duty gas turbines, and other fields, the demand for large-size, high-quality wrought superalloy bars is gradually increasing. In the preparation process, billet preparation is a crucial step in the production of superalloy bars, enabling the material to transition from the cast to the forged state. The quality of the superalloy forged billet plays a vital role in the performance of the final product.

[0003] In existing technologies, upsetting and drawing are commonly used for wrought superalloys. The upsetting process plays an important role in breaking up residual dendrites in the ingot, promoting dynamic recrystallization, and improving the microstructure of the billet. However, during the upsetting process, due to the increase in the cross-sectional area of ​​the billet and the effects of work hardening, the deformation resistance of the billet will increase sharply, which is a technical defect.

[0004] Especially during the upsetting process of large-size high-temperature alloy billets, the large billet size places higher demands on the tonnage of the high-speed forging machine. Therefore, the deformation resistance is more likely to increase sharply during the upsetting process of large-size billets, which may exceed the load-bearing capacity of the high-speed forging machine, ultimately leading to the failure of the upsetting of large-size high-temperature alloy billets.

[0005] Currently, there are many methods to reduce deformation resistance, but they all have various problems:

[0006] For example, Chinese patent CN112496246A discloses a method for solving the problem of machine stalling during the forging of automotive crankshaft forgings. This method reduces the size of the billet, improves material utilization, and significantly reduces the forging load, thus solving the problem of machine stalling during forging. It involves appropriately designing the die groove, adding damping grooves at every 90° bend in the crankshaft forging to facilitate material accumulation, and eliminating the original wedge-shaped burr groove to reduce deformation resistance. The problems with this method are that it requires the design of a reasonable die groove and the addition of damping grooves, both of which are consumables, resulting in high costs and low efficiency.

[0007] Chinese patent CN103361585A discloses a homogenization process for high-alloy GH742 high-temperature alloy. This process employs a two-step homogenization step of low-temperature pretreatment followed by high-temperature diffusion to improve the hot workability of GH742 alloy ingots and reduce deformation resistance, thereby enabling the forging billet to obtain a uniform and fully recrystallized structure. The problem is that the heat treatment process is complex, and the influence mechanism of homogenization process parameters differs for different high-temperature alloys. As the forging process progresses, the reduced deformation resistance continues to accumulate, eventually exceeding the load-bearing capacity of the forging hammer.

[0008] Chinese patent CN101362182A discloses a processing method for impact blocks, which involves hot forging of the billet followed by cold forging. This method exhibits work hardening, requiring thorough annealing and softening of the billet after hot forging to reduce deformation resistance and improve plasticity. This is beneficial for cold forging and extends die life. The problem is that it requires a hot forging and cold forging process, and the method of reducing deformation resistance through thorough annealing and softening means that a successfully hot-forged billet cannot be used to process deformable high-temperature alloys.

[0009] Chinese patent CN106964735A discloses a method for upsetting ultra-large aspect ratio metal billets, which can effectively suppress upsetting instability of ultra-large aspect ratio billets, avoid billet bending during upsetting, and control the uniformity of upsetting deformation and reduce upsetting force energy, thereby improving upsetting quality, saving upsetting energy consumption, and expanding the upsetting size range of the equipment. The problem is that in-mold upsetting uses a ring mold with a draft angle, and requires a multi-pass combination of in-mold upsetting and free upsetting. The upsetting process and mold require special settings, making operation complex, costly, and inefficient, which is not conducive to large-scale industrial production.

[0010] Chinese patent CN105414428A discloses a forging process for disc-shaped forgings, employing a five-stage heating standard to ensure uniform heating of the forgings. However, this process reduces deformation resistance through five-stage heating, which is not only complex to operate and consumes a lot of heat energy, but also requires preheating the upper and lower anvils to 300°C to prevent thermal stress from occurring in the forging parts in contact with the anvils due to excessively rapid temperature drop. The parts of the upper and lower anvils that contact the end faces of the forgings are covered with glass powder to reduce the friction between the billet and the end faces, reduce the area of ​​difficult deformation, and improve the uniformity of upsetting deformation. This results in high production costs and low efficiency, which is not conducive to large-scale industrial production.

[0011] Therefore, the present invention provides a method to reduce the resistance during the upsetting process of high-temperature alloy billets, which can make full use of the load-bearing capacity of the high-speed forging machine and ensure the effective progress of billet opening. Summary of the Invention

[0012] The technical problem to be solved by this invention is how to overcome the high resistance of high-temperature alloys during hot deformation in the prior art. This is because there is a work hardening effect during hot deformation, and the deformation resistance of the alloy increases sharply with the increase of the cross-sectional area of ​​the billet during upsetting. However, the load-bearing capacity of the equipment is limited, resulting in a situation where the deformation resistance of the alloy exceeds the load-bearing capacity of the equipment during hot deformation, making it impossible to achieve the predetermined deformation amount in the upsetting process. The invention aims to reduce the deformation resistance during the billet opening process through high-cost and low-efficiency methods such as the mechanical structure setting of the groove and damping groove, the selection of heat treatment process, and the combination of in-mold upsetting and free upsetting.

[0013] To solve the above-mentioned technical problems, the present invention provides the following technical solution:

[0014] A method for reducing the resistance during the upsetting process of a high-temperature alloy billet, the method comprising: first, performing a pre-billing heat treatment on a sample of the high-temperature alloy, followed by upsetting; during the upsetting process, when the sample resistance approaches the equipment's bearing limit, pausing the upsetting process, and then resuming the upsetting process; determining whether the sample has reached the required deformation amount, stopping if the sample has reached the required deformation amount, and pausing the upsetting process again if the sample has not reached the required deformation amount but has reached the equipment's bearing limit, and then resuming the upsetting process to obtain the desired forged high-temperature alloy material.

[0015] Preferably, in the method, the pause time for pausing the upsetting process is no more than 30 seconds.

[0016] Preferably, in the method, after the upsetting process is performed again, it is necessary to determine whether the sample has reached the required deformation amount, and repeat the aforementioned determination, upsetting and pausing upsetting steps until the sample reaches the required deformation amount.

[0017] Preferably, in the method, the heat treatment before billet preparation is a homogenization heat treatment, and the upsetting rate during the upsetting process is selected to either maintain the original rate before the pause or reduce the deformation rate.

[0018] Preferably, in the method, the pause upsetting step is a single pause, or multiple pauses with progressively decreasing speed, to obtain the required deformation amount for the target product.

[0019] Preferably, in the method, the down-pressing rate of the upsetting process is V. When the load of the fast forging machine reaches 85-100% of the upper limit of the equipment's bearing capacity, the upsetting process is paused for 5-20 seconds, and the down-pressing rate of the upsetting process is ≤V.

[0020] Preferably, in the method, the pressing rate of the upsetting process is either a variable rate or a constant rate, and the deformation amount of two upsetting processes is increased by more than 70% compared with the single upsetting process, and the deformation amount of three upsetting processes is increased by more than 150% compared with the single upsetting process.

[0021] Preferably, in the method, during the upsetting process, the temperature of the billet needs to be recorded in real time. When the billet temperature is lower than the deformation temperature range set by the alloy forging process, the process is stopped and a new heat treatment is performed.

[0022] Preferably, in the method, the microstructure of the required forged high-temperature alloy material before upsetting is a coarse as-cast grain structure, the microstructure after the first upsetting is that some areas have undergone dynamic recrystallization and recrystallized grains have appeared, and the final microstructure is a relatively uniform grain structure with a smaller grain size compared with the initial as-cast structure.

[0023] The principle of the process of this invention:

[0024] During hot deformation, wrought superalloys undergo both work hardening and dynamic softening. Work hardening gradually increases the alloy's resistance to deformation, while dynamic softening decreases this resistance. Dynamic softening during hot deformation can be achieved through two mechanisms: dynamic recrystallization and subdynamic recrystallization.

[0025] The research conducted by this invention has revealed that during the short pause after hot deformation, subdynamic recrystallization occurs inside the alloy, causing it to soften and ultimately leading to a decrease in deformation resistance.

[0026] Compared with the prior art, the present invention has the following advantages:

[0027] In the above solution, the present invention reduces the deformation resistance by pausing briefly after hot deformation close to the load limit of the high-speed forging machine, thereby increasing the amount of deformation after hot deformation and obtaining the required amount of deformation.

[0028] In the method described in this invention, the pressing rate of the upsetting process is either a variable rate or a constant rate. The deformation amount of two upsetting processes is increased by more than 70% compared to a single upsetting process, and the deformation amount of three upsetting processes is increased by more than 150% compared to a single upsetting process.

[0029] In the method described in this invention, the microstructure of the required forged high-temperature alloy material before upsetting is the original cast microstructure with extremely large grain size. After the first upsetting, the billet undergoes a certain amount of deformation and partial recrystallization, and the grain size is refined to a certain extent. After two upsetting passes, the degree of deformation of the billet is improved, and the grain size is further refined from the microstructure perspective.

[0030] In summary, the method for reducing the resistance during the upsetting process of high-temperature alloy billets of the present invention is not only simple in reducing deformation resistance during the upsetting process, and does not involve the complex operations of groove structure, channel structure and multiple heat treatment processes in the prior art, but also the final recrystallization ratio obtained is a certain percentage higher than the final recrystallization ratio obtained by the prior art in the upsetting process of high-temperature alloy billets. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a load-stroke variation curve during the upsetting process of a high-temperature alloy billet, provided in Embodiment 1 of the present invention as a method for reducing the resistance during the upsetting process of a high-temperature alloy billet.

[0033] Figure 2 This is a load-stroke variation curve during the two-stop-variable-rate upsetting process of the high-temperature alloy billet, provided in Embodiment 2 of the present invention, as part of a method for reducing the resistance of the high-temperature alloy billet during the upsetting process. Figure 3 The present invention provides a method for reducing the resistance of high-temperature alloy billet during the upsetting process, which uses the deformation and internal microstructure evolution diagram of the billet after a single-pass deformation.

[0034] Figure 4 This is a diagram illustrating the effect of intermediate pauses during the upsetting process of high-temperature alloy billets on the deformation and microstructure of the billet, in a method for reducing the resistance of high-temperature alloy billet upsetting process provided in Embodiment 1 of the present invention.

[0035] Figure 5 This is a diagram illustrating the effect of intermediate pauses during the upsetting process of high-temperature alloy billets on the deformation and microstructure of the billet, in a method 5 for reducing the resistance of high-temperature alloy billet upsetting process provided in Embodiment 2 of the present invention.

[0036] Figure 6 This is a diagram illustrating the effect of intermediate pauses during the upsetting process of high-temperature alloy billets on the deformation and microstructure of the billet, in a method for reducing the resistance of high-temperature alloy billet upsetting process provided in Embodiment 3 of the present invention.

[0037] Figure 7 This is a diagram illustrating the effect of intermediate pauses on deformation amount and deformation resistance in a method for reducing the resistance during the upsetting process of high-temperature alloy billets, as provided in Embodiment 4 of the present invention.

[0038] Figure 8The microstructure diagram is obtained when the deformation amount of the sample in the first deformation during the two-stop-variable-rate upsetting process of the high-temperature alloy billet is 15% in the method for reducing the resistance of the high-temperature alloy billet upsetting process provided in Embodiment 4 of the present invention.

[0039] Figure 9 The microstructure diagram obtained in the second deformation of the high-temperature alloy billet during the two-stop-variable-rate upsetting process provided in Embodiment 4 of the present invention is 5-15%. Detailed Implementation

[0040] The technical solutions and problems solved by the embodiments of the present invention will be described below with reference to the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them.

[0041] Example 1

[0042] A method for reducing the resistance during the upsetting process of high-temperature alloy billets, such as Figure 1 As shown, taking an equipment ultimate load of 80MN as an example, the method employs a single deformation at a two-stage deformation rate and includes the following steps:

[0043] S1. First, heat the high-temperature alloy sample before billet making. Heat the high-temperature alloy sample to 1120℃ at a rate of 40-80℃ / s and hold for 20 hours to make the temperature uniform.

[0044] S2. The high-temperature alloy sample after heat treatment in step S1 is subjected to upsetting treatment, which is the first upsetting at a pressing speed of 10 mm / s.

[0045] S3. During the upsetting process in step S2, when the deformation of the alloy (i.e. the travel of the equipment) is 254 mm, the resistance of the high-temperature alloy sample is close to the bearing limit of the equipment. The upsetting process is paused for 20 seconds.

[0046] S4. For the high-temperature alloy sample whose upsetting process was paused in step S3, the upsetting process is carried out again, which is a second upsetting at a pressing speed of 5 mm / s.

[0047] S5. Based on the judgment, the high-temperature alloy that underwent the upsetting process again in step S4 reached the equipment's limit load again. That is, when the alloy deformation reached 431mm, the upsetting process was stopped. The deformation of the billet increased by 1707mm, which is 70% higher than that of a single deformation.

[0048] like Figure 3As shown, the billet size and grain size distribution after single-pass upsetting are shown. The billet deformation is small, and the internal grain size is relatively large after deformation. The core grain size is ASTM grade -2.

[0049] like Figure 4 As shown, the billet size and grain size distribution after double-pass compression with intermediate pauses are as follows: after double-pass compression, the deformation of the billet is further increased, which can better achieve the purpose of upsetting. From the microstructure, the overall grain of the billet is further refined, and the core grain size is further reduced to ASTM grade 0.

[0050] During the upsetting process, the temperature of the billet needs to be recorded in real time. When the billet temperature is lower than the deformation temperature range set by the alloy forging process, the process is stopped and the billet is reheated in the furnace to prevent cracking and other problems during the upsetting process.

[0051] In the method, the microstructure of the required forged high-temperature alloy material before upsetting is the original cast microstructure with extremely large grain size. After the first upsetting, the billet undergoes a certain amount of deformation and partial recrystallization, and the grain size is refined to a certain extent. After two upsetting passes, the degree of deformation of the billet is improved, and the grain size is further refined from the microstructure perspective.

[0052] Example 2

[0053] A method for reducing the resistance during the upsetting process of high-temperature alloy billets, such as Figure 2 As shown, taking an equipment ultimate load of 80MN as an example, the method employs two pauses and variable speeds, and includes the following steps:

[0054] S1. First, heat the high-temperature alloy sample before billet making. Heat the high-temperature alloy sample to 1120℃ at a rate of 40-80℃ / s and hold for 20 hours to make the temperature uniform.

[0055] S2. The high-temperature alloy sample after heat treatment in step S1 is subjected to upsetting treatment, which is the first upsetting at a pressing speed of 10 mm / s.

[0056] S3. During the upsetting process in step S2, when the deformation of the alloy (i.e. the travel of the equipment) is 254 mm, the resistance of the high-temperature alloy sample is close to the bearing limit of the equipment. The upsetting process is paused for 20 seconds.

[0057] S4. For the high-temperature alloy sample whose upsetting process was paused in step S3, the upsetting process is carried out again, which is a second upsetting at a pressing speed of 5 mm / s.

[0058] S5. Based on the judgment, the high-temperature alloy undergoing the upsetting process again in step S4 has reached the equipment's limit load again. That is, when the alloy deformation reaches 431mm, the upsetting process is paused for 20s.

[0059] S6. For the high-temperature alloy sample whose upsetting process was paused in step S5, the upsetting process is carried out again. The downsetting rate for the third upsetting is 2.5 mm / s.

[0060] S7. Based on the judgment, the high-temperature alloy that underwent the upsetting process again in step S6 reached the equipment's limit load again. That is, when the alloy deformation reached 560mm, the upsetting process was stopped. The deformation of the billet increased by 306mm compared to the deformation of a single upsetting.

[0061] like Figure 3 As shown, the billet size and grain size distribution after single-pass upsetting are shown. The billet deformation is small, and the internal grain size is relatively large after deformation. The core grain size is ASTM grade -2.

[0062] like Figure 5 As shown, the billet size and grain size distribution after three compression passes with intermediate pauses are as follows: after three compression passes, the deformation of the billet is further increased, which can better achieve the purpose of upsetting. From the microstructure, the overall grain size of the billet is further refined, and the core grain size is further reduced to ASTM level 1.5.

[0063] During the upsetting process, the temperature of the billet needs to be recorded in real time. When the billet temperature is lower than the deformation temperature range set by the alloy forging process, the process is stopped and the billet is reheated in the furnace to prevent cracking and other problems during the upsetting process.

[0064] In the method, the microstructure of the required forged high-temperature alloy material before upsetting is the original cast microstructure with extremely large grain size. After the first upsetting, the billet undergoes a certain amount of deformation and partial recrystallization, and the grain size is refined to a certain extent. After two upsetting passes, the degree of deformation of the billet is improved, and the grain size is further refined from the microstructure perspective.

[0065] Example 3

[0066] A method for reducing the resistance during the upsetting process of high-temperature alloy billets, the method comprising the following steps:

[0067] S1. First, heat the high-temperature alloy sample before billet making. Heat the high-temperature alloy sample to 1120℃ at a rate of 40-80℃ / s and hold for 20 hours to make the temperature uniform.

[0068] S2. The high-temperature alloy sample after heat treatment in step S1 is subjected to upsetting treatment, which is the first upsetting at a pressing speed of 10 mm / s.

[0069] S3. During the upsetting process in step S2, if the deformation of the alloy (i.e. the stroke of the equipment) approaches the equipment's bearing limit, the upsetting process is paused for 20 seconds.

[0070] S4. For the high-temperature alloy sample whose upsetting process was paused in step S3, the upsetting process is carried out again, which is a second upsetting at a pressing speed of 5 mm / s.

[0071] S5. Based on the judgment, the high-temperature alloy that was upset again in step S4 reached the equipment's limit load again. That is, when the alloy deformation reached 431mm, the upset process was paused for 20s.

[0072] S6. For the high-temperature alloy sample whose upsetting process was paused in step S5, the upsetting process is carried out again. The downsetting rate for the third upsetting is 2.5 mm / s.

[0073] S7. Based on the judgment, when the high-temperature alloy undergoing the upsetting process again in step S4 reaches the equipment's ultimate load again, the upsetting process is paused for 20 seconds.

[0074] S8. For the high-temperature alloy sample whose upsetting process was paused in step S7, the upsetting process is carried out again. The downsetting rate of the fourth upsetting is 1 mm / s.

[0075] S9. Based on the judgment, the high-temperature alloy that underwent the upsetting process again in step S8 reached the equipment's limit load again. That is, when the alloy deformation reached 700mm, the upsetting process was stopped. The deformation of the billet increased by 446mm compared to the deformation of a single upsetting.

[0076] like Figure 3 As shown, the billet size and grain size distribution after single-pass upsetting are shown. The billet deformation is small, and the internal grain size is relatively large after deformation. The core grain size is ASTM grade -2.

[0077] like Figure 6 As shown, the billet size and grain size distribution after four compression passes with intermediate pauses are as follows: after four compression passes, the deformation of the billet is further increased, which can better achieve the purpose of upsetting. From the microstructure, the overall grain size of the billet is further refined, and the core grain size is further reduced to ASTM level 3.5.

[0078] During the upsetting process, the temperature of the billet needs to be recorded in real time. When the billet temperature is lower than the deformation temperature range set by the alloy forging process, the process is stopped and the billet is reheated in the furnace.

[0079] In the method, the microstructure of the required forged high-temperature alloy material before upsetting is the original cast microstructure with extremely large grain size. After the first upsetting, the billet undergoes a certain amount of deformation and partial recrystallization, and the grain size is refined to a certain extent. After two upsetting passes, the degree of deformation of the billet is improved, and the grain size is further refined from the microstructure perspective.

[0080] Examples 1-3 above are three actual industrial production cases, while Example 4 is a case from the perspective of laboratory mechanism. Therefore, the pause time is longer than that of Examples 1-3. Since the size of the high-temperature alloy sample is relatively small, the holding time of Examples 1-3 should be shorter than that of Examples 1-3. The technical solution of Example 4 is intended to illustrate the mechanism.

[0081] Example 4

[0082] A method for reducing the resistance during the upsetting process of high-temperature alloy billets, the method comprising the following steps:

[0083] S1. First, heat treatment is performed on the small high-temperature alloy sample with a size of φ8*12mm before billet making. The high-temperature alloy sample is heated to 1100℃ at a rate of 10℃ / s and held for 2 minutes to make the temperature uniform.

[0084] S2, The high-temperature alloy sample after heat treatment in step S1 is subjected to a 1s... -1 The compression upsetting is performed at a certain rate;

[0085] S3. During the upsetting process in step S2, when the resistance of the high-temperature alloy sample approaches the bearing limit of the equipment, the upsetting process is paused. At this time, the deformation is 1.8 mm. Under the premise of heat preservation measures, a 2-minute pause is performed.

[0086] S4. For the high-temperature alloy sample where the upsetting process was paused in step S3, re-extend it by 1 second. -1 The compression upsetting is performed at a certain rate;

[0087] S5. Based on the judgment, the high-temperature alloy that underwent the upsetting process again in step S4 reached the equipment's limit load again. That is, when the alloy deformation reached 3.6 mm, the hot compression process was stopped. The deformation of the sample increased by 1.8 mm compared to the deformation of a single upsetting, which is 100% higher.

[0088] like Figure 7 As shown, by using a double-pass deformation with a pause in the middle, the amount of deformation that can occur can be doubled under the same deformation resistance.

[0089] like Figure 8As shown, after a single-pass deformation, fine recrystallized grains appeared on the original grain boundaries, but the proportion of recrystallized grains was low.

[0090] like Figure 9 As shown, the degree of recrystallization of the sample increased after using a two-pass compression with a pause in the middle, the recrystallized grains grew larger, and the recrystallization ratio doubled.

[0091] In the above solution, the present invention reduces the deformation resistance by pausing briefly after hot deformation close to the load limit of the high-speed forging machine, thereby increasing the amount of deformation after hot deformation and obtaining the required amount of deformation.

[0092] In the method described in this invention, the pressing rate of the upsetting process is either a variable rate or a constant rate. The deformation amount of two upsetting processes is increased by more than 70% compared to a single upsetting process, and the deformation amount of three upsetting processes is increased by more than 150% compared to a single upsetting process.

[0093] In the method described in this invention, the microstructure of the required forged high-temperature alloy material before upsetting is the original cast microstructure with extremely large grain size. After the first upsetting, the billet undergoes a certain amount of deformation and partial recrystallization, and the grain size is refined to a certain extent. After two upsetting passes, the degree of deformation of the billet is improved, and the grain size is further refined from the microstructure perspective.

[0094] In summary, the method for reducing the resistance during the upsetting process of high-temperature alloy billets of the present invention is not only simple in reducing deformation resistance during the upsetting process, and does not involve the complex operations of groove structure, channel structure and multiple heat treatment processes in the prior art, but also the final recrystallization ratio obtained is a certain percentage higher than the final recrystallization ratio obtained by the prior art in the upsetting process of high-temperature alloy billets.

[0095] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for reducing the resistance during the upsetting process of high-temperature alloy billets, characterized in that, The method includes first performing a pre-brushing heat treatment on the high-temperature alloy sample, which involves heating to 1120℃ at a rate of 40-80℃ / s and holding for 20 hours to ensure temperature uniformity, followed by upsetting. During the upsetting process, when the sample resistance approaches the equipment's bearing limit, the upsetting process is paused, and then the upsetting process is repeated. It is then determined whether the sample has reached the required deformation amount. If the sample has reached the required deformation amount, the upsetting process is stopped. If the sample has not reached the required deformation amount but has reached the equipment's bearing limit, the upsetting process needs to be paused again, and then the sample is upset again to obtain the desired forged high-temperature alloy material. The pause time for pausing the upsetting process shall not exceed 30 seconds; The pressing rate during the second upsetting process is either variable or constant. The deformation amount of two upsetting processes is more than 70% higher than that of a single upsetting process, and the deformation amount of three upsetting processes is more than 150% higher than that of a single upsetting process. In the method, the down pressure rate of the upsetting process is V. When the load of the fast forging machine reaches 85-100% of the upper limit of the equipment's bearing capacity, the upsetting process is paused for 5-20 seconds, and the down pressure rate of the upsetting process is <V. In the method, the microstructure of the required forged high-temperature alloy material before upsetting is a coarse as-cast grain structure. After the first upsetting, the microstructure shows that some areas have undergone dynamic recrystallization and recrystallized grains have appeared. The final microstructure is a relatively uniform grain structure, with a smaller grain size compared to the initial as-cast structure.

2. The method for reducing the resistance during the upsetting process of high-temperature alloy billets according to claim 1, characterized in that, In the method, after the upsetting process is performed again, it is necessary to determine whether the sample has reached the required deformation amount. The aforementioned determination, upsetting, and pause upsetting steps are repeated until the sample reaches the required deformation amount.

3. The method for reducing the resistance during the upsetting process of high-temperature alloy billets according to claim 1, characterized in that, In the method described above, the heating treatment before blanking is a homogenization heat treatment.

4. The method for reducing the resistance during the upsetting process of high-temperature alloy billets according to claim 1, characterized in that, In the method, during the upsetting process, the temperature of the billet needs to be recorded in real time. When the billet temperature is lower than the deformation temperature range set by the alloy forging process, the process is stopped and the billet is reheated in the furnace.

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