A GH4099 high-temperature alloy ring and its forging method

Abstract

This invention relates to the field of high-temperature alloy ring forging, specifically to a GH4099 high-temperature alloy ring and its forging method. The forging method for the GH4099 high-temperature alloy ring includes the following steps: a billet undergoes a first heat treatment to obtain a billet heated to the forging temperature; the billet undergoes upsetting, punching, first air cooling, and boring to obtain a ring blank; the ring blank undergoes a second heat treatment, initial rolling with a first heat treatment, a second air cooling, a third heat treatment, final rolling with a second heat treatment, and bulging. The method is low-cost, simple, and enables stable mass production. The forged ring has uniform deformation, good grain size uniformity, is not prone to cracking, exhibits excellent mechanical properties, strong plasticity, and precise finished product dimensions.

Description

Technical Field

[0001] This invention relates to the field of high-temperature alloy ring forging, and more specifically, to a GH4099 high-temperature alloy ring and its forging method. Background Technology

[0002] GH4099 alloy has a long-term service temperature of up to 900℃ and good cold and hot formability and weldability. Its ring parts are widely used in the core structural components of the hot end of aerospace engines, and are subjected to complex thermo-mechanical coupling conditions. The quality and reliability of GH4099 ring parts play an important role in the performance level of aerospace engines.

[0003] GH4099 (Russian designation ЭИ693) is a Ni-Cr based precipitation-hardening wrought superalloy with a long-term service temperature of 900℃ and a short-term maximum service temperature of 1000℃. The alloy exhibits high heat resistance, stable microstructure, and satisfactory cold and hot working and welding properties. It is mainly produced in the form of rings, rolled bars, and plates, and is suitable for manufacturing high-temperature welded structural components such as combustion chambers and afterburners for aerospace engines.

[0004] The phase composition of GH4099 alloy is relatively complex. The matrix is ​​a γ phase with a face-centered cubic structure, and there are also γ' phase, Ti(CN) type primary nitrides, and M... 23 C6 secondary carbides and δ and μ phases appearing after long-term aging. The γ' phase is the main precipitation strengthening phase in the GH4099 alloy, with a precipitation temperature range of 720℃ to 950℃ and a precipitation peak at 800℃ to 850℃.

[0005] GH4099 alloy is characterized by high alloying strength and difficulty in forming. The microstructure of the alloy is complex, and its evolution during forging hot deformation is a result of dynamic recrystallization and other hot deformation mechanisms. Deformation conditions such as deformation temperature and strain rate have a crucial impact on the dynamic recrystallization phenomenon during hot forming. Inappropriate process parameters can easily lead to inhomogeneous microstructure and inconsistent mechanical properties in the final ring-shaped parts, resulting in unstable part quality and reduced reliability in service. Therefore, it is essential to improve the microstructure uniformity of GH4099 alloy ring-shaped parts. The microstructure uniformity of GH4099 alloy plays a vital role in its performance uniformity, machining stability, and service reliability. For GH4099 alloy, in addition to optimizing the microstructure uniformity of the raw material bars, controlling the rolling and heat treatment processes is also crucial to ensure that the microstructure of GH4099 alloy ring-shaped parts is uniform both internally and externally, with an average grain size controlled to grade 4.5 or finer. This guarantees good uniformity of mechanical properties and ensures stable quality of the ring-shaped parts.

[0006] In view of this, the present invention is hereby proposed. Summary of the Invention

[0007] One aspect of the present invention relates to a forging method for a GH4099 high-temperature alloy ring-shaped part, comprising the following steps:

[0008] The billet is subjected to a first heat treatment to obtain a billet that has been raised to the forging temperature; the billet is subjected to upsetting punching, first air cooling and boring to obtain a ring billet; the ring billet is subjected to a second heat treatment, initial rolling first heat treatment, second air cooling, third heat treatment, final rolling second heat treatment and expansion forming;

[0009] The first heat preservation includes: the billet is put into the furnace at ≤600℃, heated to 750~850℃ within 55~65min and held at (0.7~0.9)×Hmin; heated to 1080℃~1100℃ within 85~95min and held at 0.7~0.9×Hmin;

[0010] The second heat preservation includes: the ring billet is placed in the furnace at ≤600℃, heated to 750-850℃ for 55-65 minutes and held for (0.7-0.9)×Hmin; heated to 1080-1100℃ for 85-95 minutes and held for 0.7-0.9×Hmin.

[0011] The third heat preservation includes: after the second air cooling, the ring billet is put into the furnace at ≤600℃, heated to 750-850℃ for 55-65 minutes and held for (0.7-0.9)×Hmin; heated to 1080-1100℃ for 85-95 minutes and held for 0.7-0.9×Hmin.

[0012] H represents the minimum effective cross-sectional thickness of the annular component.

[0013] The forging method for the GH4099 high-temperature alloy ring part is low-cost, simple, and can be stably mass-produced. The forged ring part has uniform deformation, good grain uniformity, is not easy to crack, has excellent mechanical properties, strong plasticity, and precise finished product dimensions.

[0014] Another aspect of the present invention relates to a GH4099 high-temperature alloy ring forged by the forging method described above.

[0015] The GH4099 high-temperature alloy ring part has uniform deformation, good grain size uniformity, is not easy to crack, has excellent mechanical properties, strong plasticity, and precise finished product dimensions.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0017] (1) The forging method for GH4099 high-temperature alloy ring parts provided by this invention shortens the time of the first heat of the initial rolling to less than 60 seconds, ensuring the final forging temperature and reducing the risk of cracking; it improves product quality, production efficiency and process controllability, and is suitable for stable batch production; an expansion forming process is added after the final rolling to precisely control the finished size of the ring parts, which can effectively save raw materials; by reducing the rolling temperature, excessive grain growth is prevented from forming coarse grains; the deformation amount per heat of rolling is about 30%, which can ensure sufficient recrystallization and refine the grain structure, while preventing excessive deformation and cracking. Thus, the uniformity of the microstructure and properties and the quality stability of the ring parts are effectively improved.

[0018] (2) The GH4099 high-temperature alloy ring provided by the present invention has uniform deformation, good uniformity of grain size, is not easy to crack, has excellent mechanical properties, strong plasticity, and precise finished product dimensions. Attached Figure Description

[0019] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0020] Figure 1 The image shows the grain size observation results of the GH4099 annular component in Comparative Example 1.

[0021] Figure 2 This is a diagram showing the grain size observation results of the GH4099 annular component in Example 1;

[0022] Figure 3 The image shows the observation results of intergranular carbides in the GH4099 ring-shaped component of Comparative Example 1.

[0023] Figure 4 This is an image showing the observation results of intergranular carbides in the GH4099 ring-shaped component of Example 1. Detailed Implementation

[0024] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings and specific embodiments. However, those skilled in the art will understand that the embodiments described below are some embodiments of the present invention, but not all embodiments, and are only used to illustrate the present invention, and should not be regarded as limiting the scope of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention. Where specific conditions are not specified in the embodiments, conventional conditions or conditions recommended by the manufacturer shall be followed. Where the manufacturers of reagents or instruments are not specified, they are all conventional products that can be purchased commercially.

[0025] One aspect of the present invention relates to a forging method for a GH4099 high-temperature alloy ring, comprising the following steps:

[0026] The billet is subjected to a first heat treatment to obtain a billet that has been raised to the forging temperature; the billet is subjected to upsetting punching, first air cooling and boring to obtain a ring billet; the ring billet is subjected to a second heat treatment, initial rolling first heat treatment, second air cooling, third heat treatment, final rolling second heat treatment and expansion forming;

[0027] The first heat preservation includes: placing the billet into the furnace at ≤600℃ (e.g., 600℃, 550℃, 500℃, 450℃, 400℃, 300℃, 200℃, or 100℃), and heating it to 750-850℃ (e.g., 750℃, 770℃, 790℃, 810℃, 830℃, or 850℃) within 55-65 minutes (e.g., 55 minutes, 57 minutes, 59 minutes, 61 minutes, 63 minutes, or 65 minutes). Hold at 0℃ for (0.7~0.9) × Hmin; raise the temperature to 1080℃~1100℃ (e.g. 1080℃, 1083℃, 1085℃, 1088℃, 1090℃, 1093℃, 1095℃, 1098℃ or 1100℃) for 85~95min (e.g. 85min, 87min, 89min, 91min, 93min or 95min) and hold for 0.7~0.9 × Hmin.

[0028] The second heat preservation includes: the ring billet is placed in the furnace at ≤600℃ (e.g., 600℃, 550℃, 500℃, 450℃, 400℃, 300℃, 200℃ or 100℃), and heated to 750-850℃ (e.g., 750℃, 770℃, 790℃, 810℃, 830℃ or 850℃) for 55-65 minutes (e.g., 55 minutes, 57 minutes, 59 minutes, 61 minutes, 63 minutes or 65 minutes). Hold at 0℃ for (0.7~0.9) × Hmin; raise the temperature to 1080℃~1100℃ (e.g. 1080℃, 1083℃, 1085℃, 1088℃, 1090℃, 1093℃, 1095℃, 1098℃ or 1100℃) for 85~95min (e.g. 85min, 87min, 89min, 91min, 93min or 95min) and hold for 0.7~0.9 × Hmin.

[0029] The third heat preservation includes: after the second air cooling, the ring billet is placed in the furnace at ≤600℃ (e.g., 600℃, 550℃, 500℃, 450℃, 400℃, 300℃, 200℃ or 100℃), and heated to 750-850℃ (e.g., 750℃, 770℃, 790℃, 810℃, 830℃) for 55-65 minutes (e.g., 55 minutes, 57 minutes, 59 minutes, 61 minutes, 63 minutes or 65 minutes). Hold at 850℃ (or 850℃) for (0.7~0.9) × Hmin; raise the temperature to 1080℃~1100℃ (e.g. 1080℃, 1083℃, 1085℃, 1088℃, 1090℃, 1093℃, 1095℃, 1098℃ or 1100℃) for 0.7~0.9 × Hmin after 85~95min (e.g. 85min, 87min, 89min, 91min, 93min or 95min) and hold for 0.7~0.9 × Hmin.

[0030] H represents the minimum effective cross-sectional thickness of the annular component.

[0031] The forging method for the GH4099 high-temperature alloy ring-shaped component involves meticulous control over the temperature, time, and process connections during the forging process. When the rolling temperature exceeds 1100℃, grain growth is rapid, leading to coarse grains or even mixed grains in the final ring. The low-temperature large deformation method, by lowering the rolling temperature below 1100℃, prevents excessive grain growth and coarse grain formation, playing a crucial role in ensuring the final ring's grain size and mechanical properties. For precise control of the finished product dimensions, a bulging process is added after final rolling, ensuring the forging temperature before bulging is above 800℃. This effectively saves raw materials.

[0032] Preferably, the deformation time of the first heat of the initial rolling is ≤60s (e.g., 60s, 55s, 50s or 45s).

[0033] Preferably, the deformation time of the second final rolling is ≤120s (e.g., 120s, 110s, 100s, 90s or 80s).

[0034] Preferably, the deformation amount of the first heat of the initial rolling is 25% to 35% (e.g., 25%, 27%, 29%, 31%, 33% or 35%).

[0035] Preferably, the deformation amount of the final rolling second fire is 25% to 35% (e.g., 25%, 27%, 29%, 31%, 33% or 35%).

[0036] Preferably, the deformation amount of the upsetting slab punch is 35% to 45% (e.g., 35%, 37%, 39%, 41%, 43%, or 45%). The deformation amount of the upsetting slab punch is sufficient to ensure more complete recrystallization.

[0037] Because it is forged at low temperatures, GH4099 material has high resistance to high-temperature deformation. The deformation per rolling pass is approximately 30%, which ensures sufficient recrystallization and refines the grain structure while preventing excessive deformation and cracking. This effectively improves the uniformity of the microstructure and the quality stability of the ring-shaped part.

[0038] Preferably, the upsetting time for the billet is ≤180s (e.g., 180s, 170s, 160s, 150s, 140s, or 130s). The upsetting time is controlled to ensure that the final forging temperature of the billet is not too low.

[0039] Preferably, the temperature during the bulging of the ring blank is >800°C (e.g., 810°C, 830°C, 850°C, 880°C, or 900°C).

[0040] After the ring billet is air-cooled after being punched, it is bored. If there are cracks on the surface of the billet, they need to be removed by machining or grinding. Check whether all surface cracks have been removed.

[0041] After the first fire of the initial rolling is completed, the ring billet is air-cooled. If there are cracks on the surface of the billet, they need to be removed by machining or grinding. It is also confirmed that all surface cracks have been removed.

[0042] Preferably, before the billet is loaded into the furnace, the punch, punch barrel, gasket, tamper and upper and lower circular anvils are preheated.

[0043] Preferably, the preheating temperature is ≥250℃ (e.g., 250℃, 280℃, 300℃, 330℃, or 350℃). Preheating to a certain temperature can effectively ensure the forging temperature of the billet.

[0044] Another aspect of the present invention relates to a GH4099 high-temperature alloy ring forged by the forging method described above.

[0045] The GH4099 high-temperature alloy ring part has uniform deformation, good grain size uniformity, is not easy to crack, has excellent mechanical properties, strong plasticity, and precise finished product dimensions.

[0046] The embodiments of the present invention will now be described in detail with reference to specific examples and comparative examples.

[0047] Example 1

[0048] The outline dimensions of the ring-shaped component are: The forging weighs approximately 12.5 kg, and the blank specifications are as follows: It weighs approximately 44 kg.

[0049] The specific process steps for forming this ring forging are as follows:

[0050] 1. Preheat the punch, punch barrel, gasket, and tamper to above 250°C; preheat the upper and lower round anvils of the blank to above 250°C, and place insulation cotton on the upper and lower surfaces of the worktable;

[0051] 2. Load the billet into the furnace at ≤600℃ for the first holding, raise the temperature to 800℃ for 60 minutes, hold for 80 minutes, and then raise the temperature to 1080℃~1100℃ for 90 minutes and hold for 90 minutes to obtain the billet that has been raised to the forging temperature.

[0052] 3. The ring blank obtained by punching holes in the bar billet is approximately the following size: The deformation of the bar billet upsetting dies is 40%, and the total time for the bar billet upsetting dies to be punched does not exceed 180 seconds;

[0053] 4. After cooling the punched bar billet, bore the hole to obtain a ring billet; the ring billet is then subjected to a second heat preservation. The ring billet is loaded into the furnace at ≤600℃, heated to 800℃ in 60 minutes, and held for 80 minutes. Then, the temperature is increased to 1080℃~1100℃ in 90 minutes and held for 90 minutes.

[0054] 5. Use a vertical ring rolling mill to perform the first initial rolling of the ring billet after the second heat preservation; the dimensions of the first initial rolling are as follows: The deformation amount of the first heat in the initial rolling is 30%, and the deformation time of the first heat in the initial rolling is 60s;

[0055] 6. Perform the third heat preservation: load the air-cooled ring billet into the furnace at ≤600℃, raise the temperature to 800℃ in 60 minutes, hold for 80 minutes, and then raise the temperature to 1080℃~1100℃ in 90 minutes and hold for 90 minutes.

[0056] 7. Use a vertical ring rolling mill to perform a second final rolling on the ring billet after the third heat treatment; the dimensions of the second final rolling are as follows: The deformation amount of the second heat in the final rolling is 30%, and the deformation time of the second heat in the final rolling is within 120 seconds;

[0057] 8. Ensure the forging temperature is greater than 800℃ before bulging; precisely control the final dimensions of the ring-shaped part:

[0058] 9. The physical and chemical tests of the ring-shaped component show that all indicators such as its structure and properties meet the standard requirements.

[0059] Example 2

[0060] The outline dimensions of the ring-shaped component are: The forging weighs approximately 12.5 kg, and the blank specifications are as follows: It weighs approximately 44 kg.

[0061] The specific process steps for forming this ring forging are as follows:

[0062] 1. Same as Example 1;

[0063] 2. Load the billet into the furnace at ≤600℃ for the first holding, raise the temperature to 750℃ for 55 minutes, hold for 70 minutes, and then raise the temperature to 1080℃~1100℃ for 95 minutes and hold for 70 minutes to obtain the billet that has been raised to the forging temperature.

[0064] 3. The ring blank obtained by punching holes in the bar billet is approximately the following size: The deformation of the bar billet upsetting dies is 35%, and the total time for the bar billet upsetting dies is 160s;

[0065] 4. After cooling the punched bar billet, bore the hole to obtain a ring billet; the ring billet is then subjected to a second heat preservation. The ring billet is loaded into the furnace at ≤600℃, heated to 850℃ in 55 minutes, and held for 70 minutes. Then, the temperature is increased to 1080℃~1100℃ in 95 minutes and held for 70 minutes.

[0066] 5. Use a vertical ring rolling mill to perform the first initial rolling of the ring billet after the second heat preservation; the dimensions of the first initial rolling are as follows: The deformation amount of the initial rolling is 25%, and the deformation time of the first heat of the initial rolling is 50s;

[0067] 6. Perform the third heat preservation: load the air-cooled ring billet into the furnace at ≤600℃, raise the temperature to 850℃ in 65 minutes, hold for 90 minutes, and then raise the temperature by 95 minutes to 1080℃~1100℃ and hold for 70 minutes.

[0068] 7. Use a vertical ring rolling mill to perform a second final rolling on the ring billet after the third heat treatment; the dimensions of the second final rolling are as follows: The deformation amount of the second heat in the final rolling is 25%, and the deformation time of the second heat in the final rolling is within 110 seconds;

[0069] 8. Same as Example 1;

[0070] 9. Same as Example 1.

[0071] Example 3

[0072] The outline dimensions of the ring-shaped component are: The forging weighs approximately 12.5 kg, and the blank specifications are as follows: It weighs approximately 44 kg.

[0073] The specific process steps for forming this ring forging are as follows:

[0074] 1. Same as Example 1;

[0075] 2. Load the billet into the furnace at ≤600℃ for the first holding, raise the temperature to 850℃ for 65 minutes, hold for 90 minutes, and then raise the temperature to 1080℃~1100℃ for 85 minutes and hold for 80 minutes to obtain the billet that has been raised to the forging temperature.

[0076] 3. The ring blank obtained by punching holes in the bar billet is approximately the following size: The deformation of the bar billet upsetting dies is 45%, and the total time for the bar billet upsetting dies to be punched does not exceed 150 seconds;

[0077] 4. After cooling the punched bar billet, bore the hole to obtain a ring billet; the ring billet is then subjected to a second heat preservation. The ring billet is loaded into the furnace at ≤600℃, heated to 750℃ in 65 minutes, and held for 90 minutes. Then, the temperature is increased to 1080℃~1100℃ in 85 minutes and held for 80 minutes.

[0078] 5. Use a vertical ring rolling mill to perform the first initial rolling of the ring billet after the second heat preservation; the dimensions of the first initial rolling are as follows: The deformation amount of the first heat in the initial rolling is 25%, and the deformation time of the first heat in the initial rolling is 55 seconds;

[0079] 6. Perform the third heat preservation: load the air-cooled ring billet into the furnace at ≤600℃, raise the temperature to 750℃ in 55 minutes, hold for 70 minutes, and then program the temperature to rise to 1080℃~1100℃ in 85 minutes and hold for 80 minutes.

[0080] 7. Use a vertical ring rolling mill to perform a second final rolling on the ring billet after the third heat treatment; the dimensions of the second final rolling are as follows: The deformation amount of the second heat in the final rolling is 35%, and the deformation time of the second heat in the final rolling is within 100 seconds;

[0081] 8. Same as Example 1;

[0082] 9. Same as Example 1.

[0083] Comparative Example 1

[0084] The outline dimensions of the ring-shaped component are: The forging weighs approximately 12.5 kg, and the blank specifications are as follows: It weighs approximately 44 kg.

[0085] The specific process steps for forming this ring forging are as follows:

[0086] 1. Same as Example 1;

[0087] 2. Load the billet into the furnace at ≤600℃ for the first heat preservation, raise the temperature to 800℃ for 60 minutes, hold for 80 minutes, and then raise the temperature by 90 minutes to 1110℃~1140℃ and hold for 90 minutes to obtain the billet upsetting at the forging temperature.

[0088] 3. Same as Example 1;

[0089] 4. After cooling the punched bar billet, bore the hole to obtain a ring billet; the ring billet is then subjected to a second heat preservation. The ring billet is loaded into the furnace at ≤600℃, heated to 800℃ in 60 minutes, and held for 80 minutes. Then, the temperature is increased to 1110℃~1140℃ in 90 minutes and held for 90 minutes.

[0090] 5. Use a high-speed forging mill and a frame to perform the first pre-rolling expansion of the ring billet after the second heat treatment; the dimensions of the first pre-rolling expansion are as follows: The deformation amount of the first heat in the initial rolling is 30%, and the deformation time of the first heat in the initial rolling is 90s;

[0091] 6. Perform the third heat preservation: load the air-cooled ring billet into the furnace at ≤600℃, raise the temperature to 800℃ in 60 minutes, hold for 80 minutes, and then raise the temperature by 90 minutes to 1110℃~1120℃ and hold for 90 minutes.

[0092] 7. Perform a second final rolling on the ring billet after the third heat treatment; the dimensions of the second final rolling are as follows: The deformation amount of the second heat in the final rolling is 30%, and the deformation time of the second heat in the final rolling is greater than 120s.

[0093] Experimental Example

[0094] (1) Grain structure

[0095] The grain size of the GH4099 ring component in Example 1 and Comparative Example 1 was compared, and the results are shown in [the table below]. Figure 1 and Figure 2Comparison shows that the method of the present invention improves the uniformity of the annular structure. The grain size of Comparative Example 1 is coarse at level 1 to 3, while the grain size of different parts of Example 1 is uniform, with an average grain size of level 5 to 7, indicating better uniformity.

[0096] (2) Intergranular carbides

[0097] See results Figure 3 and Figure 4 As shown in the figure, the carbides in Comparative Example 1 are mostly distributed in the grain boundary region, while the carbides in Example 1 are uniformly distributed within the grains and on the grain boundaries, which further improves the strength and plasticity of the material. No harmful substances such as intergranular film carbides were found in either Comparative Example 1 or Example 1. This demonstrates that the forging method of the GH4099 high-temperature alloy ring part of the present invention results in a more uniform distribution of carbides in the ring part.

[0098] (3) Mechanical properties of ring components

[0099] The results are shown in Tables 1, 2, 3, and 4. The annular component of Comparative Example 1, due to its coarse grains, met the specifications, but its strength and plasticity margin was small. Both room temperature tensile strength and plasticity were low, with small margins compared to the specifications; high-temperature tensile plasticity was average. Hardness and high-temperature creep rupture mechanical properties met the standard requirements. The annular component of Example 1 met the standard requirements for room temperature tensile, hardness, high-temperature tensile, and high-temperature creep rupture mechanical properties, with large margins. The results from two samples of each were relatively uniform, indicating stable performance. The annular components of Examples 2 and 3 also met the standard requirements for room temperature tensile, hardness, high-temperature tensile, and high-temperature creep rupture mechanical properties. This demonstrates that the forging method for the GH4099 high-temperature alloy annular component provided by this invention yields annular components with stable and excellent mechanical properties.

[0100] Table 1 Mechanical properties of the ring-shaped component in Comparative Example 1

[0101]

[0102] Note: After the service life exceeds 24 hours, apply a force of 500N every 12 hours until it breaks.

[0103] Table 2 Mechanical properties of the ring-shaped component in Example 1

[0104]

[0105]

[0106] Note: After the service life exceeds 24 hours, apply a force of 500N every 12 hours until it breaks.

[0107] Table 3 Mechanical properties of the ring-shaped component in Example 2

[0108]

[0109] Note: After the service life exceeds 24 hours, apply a force of 500N every 12 hours until it breaks.

[0110] Table 4 Mechanical properties of the ring-shaped component in Example 3

[0111]

[0112] Note: After the service life exceeds 24 hours, apply a force of 500N every 12 hours until it breaks.

[0113] The ring-shaped part of this invention uses a vertical ring rolling mill for reaming, replacing the existing high-speed forging mill + frame reaming technology. On the one hand, it reduces the reaming time from more than 90 seconds to less than 60 seconds, ensuring the final forging temperature and reducing the risk of cracking. On the other hand, it also makes the deformation of the ring more uniform. The use of automated equipment for reaming also increases the precise control of deformation and the controllability of the reaming process, while improving product quality, production efficiency and process controllability, making it suitable for stable mass production.

[0114] To control the dimensions of the finished product, an expansion forming process was added after final rolling to ensure that the temperature of the forging before expansion forming is greater than 800℃, so as to accurately control the dimensions of the finished ring and effectively save raw materials.

[0115] By meticulously controlling the temperature, time, and process connections of the forging process for GH4099 high-temperature alloy ring parts, it was found that when the rolling temperature exceeds 1100℃, the grains grow rapidly, leading to coarse grains or even mixed grains in the final ring part. A low-temperature, large-deformation method was employed, lowering the rolling temperature to below 1100℃ to prevent excessive grain growth and coarse grain formation. Due to the low-temperature forging process, GH4099 material exhibits high high-temperature resistance. By limiting the deformation per rolling pass to approximately 30%, sufficient recrystallization and grain refinement are ensured, while excessive deformation and cracking are prevented. This effectively improves the uniformity of the microstructure and the quality stability of the ring parts.

[0116] Although the present invention has been illustrated and described with specific embodiments, it should be understood that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; those skilled in the art should understand that modifications can be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein, without departing from the spirit and scope of the present invention; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention; therefore, this means that all such substitutions and modifications that fall within the scope of the present invention are included in the appended claims.

Claims

1. A method of forging a GH4099 high temperature alloy annular piece, characterized in that, It comprises the following steps: The bar blank is subjected to first holding to obtain a bar blank raised to a forging temperature; the bar blank is subjected to upsetting and punching, first air cooling and boring to obtain a ring blank; The ring blank is subjected to second holding, rough rolling first heating, second air cooling, third holding, finish rolling second heating and bulging; The first holding comprises: the bar blank ≤600℃ is put into a furnace, is raised to 750~850℃ in 55~65min and is held for (0.7~0.9) ×Hmin; is raised to 1080℃~1100℃ in 85~95min and is held for 0.7~0.9×Hmin; The second holding comprises: the ring blank ≤600℃ is put into a furnace, is raised to 750~850℃ in 55~65min and is held for (0.7~0.9) ×Hmin; is raised to 1080℃~1100℃ in 85~95min and is held for 0.7~0.9×Hmin; The third holding comprises: the ring blank ≤600℃ after the second air cooling is put into a furnace, is raised to 750~850℃ in 55~65min and is held for (0.7~0.9) ×Hmin; is raised to 1080℃~1100℃ in 85~95min and is held for (0.7~0.9) ×Hmin; The H is the minimum thickness of the effective section of the ring-shaped piece; The deformation time of the rough rolling first heating is ≤60s; The deformation time of the finish rolling second heating is ≤120s; The deformation amount of the rough rolling first heating is 25%~35%; The deformation amount of the finish rolling second heating is 25%~35%; The deformation amount of the bar blank upsetting and punching is 35%~45%.

2. The method of claim 1, wherein the GH4099 high temperature alloy annular piece is forged at a temperature of 1,100°C to 1,300°C. The time of the bar blank upsetting and punching is ≤180s.

3. The method of claim 1, wherein the GH4099 high temperature alloy annulus is forged at a temperature of 1200°C to 1300°C. The temperature of the ring blank when the bulging is performed is >800℃.

4. The method of claim 1, wherein the GH4099 high temperature alloy annulus is forged at a temperature of 1,100°C to 1,200°C. Before the bar blank is put into the furnace, the punch, the punching barrel, the gasket, the beating plate and the upper and lower anvil are preheated; The preheating temperature is ≥250℃.

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