High-performance turbine disc forge piece for gas turbine and preparation method

Abstract

The invention discloses a high-performance turbine disc forge piece for a gas turbine and a preparation method, and the high-performance turbine disc forge piece comprises the following raw material components in percentage by weight: 0.08-0.16% of C, less than or equal to 0.12% of Si, less than or equal to 1.03% of Mn, 1.95-2.55% of Ni, 9.65-10.25% of Cr, 0.53-1.15% of Mo, 0.14-0.26% of V, 0.03-0.07% of Nb, 0.01-0.05% of Ta, 0.0005-0.0060% of B, 0.005-0.035% of N, less than or equal to 0.02% of Al, less than or equal to 0.015% of P, less than or equal to 0.015% of S, less than or equal to 0.0015% of Sb, less than or equal to 0.10% of Cu, less The problems that a high-alloying wheel disc forge piece is prone to cracking and poor in structure uniformity in the preparation process are solved, and the high-alloying wheel disc forge piece has the excellent comprehensive mechanical property.

Description

Technical Field

[0001] This invention relates to the field of gas turbine technology, and more specifically to a high-performance turbine disk forging for gas turbines and its preparation method. Background Technology

[0002] Gas turbines, with their high efficiency, flexibility, and low emissions, are widely used in power energy, industrial drives, transportation, and national defense, becoming one of the core equipment for energy transformation and industrial upgrading. Their core component, the turbine disk, needs to operate for extended periods in harsh environments such as high temperature, high stress, high speed, and corrosive gases, thus placing extremely stringent performance requirements on it. With the development of gas turbines, the turbine disk manufacturing process has continuously increased the use of alloying elements to meet the requirements for high-performance forgings. However, this has also brought significant challenges to the development and preparation of alloy forgings. The large increase in alloying elements easily leads to cracking during forging and heat treatment, as well as problems with microstructure uniformity. Traditional manufacturing processes have poor overall performance and cannot meet the requirements of advanced gas turbines for high-performance turbine disks. Summary of the Invention

[0003] To address the above technical problems, this invention provides a high-performance turbine disk forging for gas turbines and its preparation method.

[0004] The present invention adopts the following technical solution: A high-performance turbine disk forging for gas turbines, wherein the raw material composition of the forging comprises, by weight percentage: C: 0.08–0.16%, Si ≤ 0.12%, Mn ≤ 1.03%, Ni: 1.95–2.55%, Cr: 9.65–10.25%, Mo: 0.53–1.15%, V: 0.14–0.26%, Nb: 0.03–0.07%, Ta: 0.01–0.05%, B: 0.0005%–0.0060%, N: 0.005–0.035%, Al ≤ 0.02%, P ≤ 0.015%, S ≤ 0.015%, Sb ≤ 0.0015%, Cu ≤ 0.10%, Sn ≤ 0.013%, As ≤ 0.017%, with the remainder being Fe.

[0005] Preferably, the raw material composition of the wheel forging, by weight percentage, includes: C: 0.09%, Si: 0.05%, Mn: 0.91%, Ni: 2.15%, Cr: 9.85%, Mo: 0.77%, V: 0.16%, Nb: 0.05%, Ta: 0.02%, B: 0.0012%, N: 0.007%, Al: 0.005%, P: 0.007%, S: 0.008%, Sb: 0.008%, Cu: 0.07%, Sn: 0.006%, As: 0.004%, with the remainder being Fe.

[0006] Preferably, the raw material composition of the wheel forging, by weight percentage, includes: C: 0.10%, Si: 0.06%, Mn: 1.00%, Ni: 2.45%, Cr: 10.0%, Mo: 0.89%, V: 0.23%, Nb: 0.03%, Ta: 0.04%, B: 0.002%, N: 0.02%, Al: 0.01%, P: 0.009%, S: 0.009%, Sb: 0.005%, Cu: 0.04%, Sn: 0.008%, As: 0.009%, with the remainder being Fe.

[0007] A method for preparing a high-performance turbine disk forging for gas turbines includes the following steps: S1: Melt the wheel forgings into steel ingots according to their raw material composition; S2: The steel ingot is forged by free forging and cut into blanks according to the required size of the turbine disk; S3: The billet is die-forged to obtain a steel billet; S4: The steel billet is die-forged to obtain the turbine disk forging; S5: Preheat and perform performance heat treatment on the turbine disk forging.

[0008] Preferably, in step S1, the smelting method is alkaline electric arc furnace smelting followed by vacuum deoxidation and refining outside the furnace.

[0009] Preferably, in step S2, the steel ingot obtained in step S1 needs to undergo a first homogenization treatment before free forging. The first homogenization treatment adopts a stepped heating method: the steel ingot is placed in a heating furnace and heated to 880℃~930℃, held for 4~6 hours, and then heated to 1180℃~1230℃, held for 10 hours~15 hours. During free forging, the steel ingot needs to be pressed, chamfered, and the sprue removed, and then upset, drawn, and rounded. The upsetting deformation during the free forging process is 20%~50%, and the drawing deformation is 25%~70%.

[0010] Preferably, in step S3, during die forging, the billet undergoes a second homogenization treatment before forging. This second homogenization treatment employs a stepped heating method: the billet is placed in a heating furnace and heated to 870℃~920℃, held for 2~3 hours, and then further heated to 1190℃~1210℃, held for 6 hours~10 hours. The deformation of the billet flange is 25%~50%, and the deformation of the hub is 10%~20%.

[0011] Preferably, in step S4, before die forging, the steel billet undergoes a third homogenization treatment; the third homogenization treatment adopts a stepped heating method: the steel billet is placed in a heating furnace and heated to 860℃~900℃, held for 2~3 hours, and then heated to 1170℃~1200℃, held for 5 hours~8 hours; in the die forging, the flange deformation is 3%~9%, and the hub deformation is 20%~30%.

[0012] Pre-forging high-temperature homogenization treatment can reduce segregation and optimize the welding ability of internal defects, thereby improving the uniformity of composition and structure. Simultaneously, the plasticity of alloy steel increases at high temperatures, and prolonged heat treatment promotes the escape of gases (such as H2 and N2) from the pores, reducing internal pressure and preventing the pores from expanding into cracks during forging. Incorporating multiple high-temperature homogenization treatments during the forging process can further enhance these beneficial effects.

[0013] In this invention, the free forging blank mainly produces a broken as-cast structure, eliminates macroscopic segregation, and improves the effect of subsequent die forging deformation. During die forging, pressure is applied in a closed cavity to force metal flow, promotes dynamic recrystallization, further refines the grains, and improves the uniformity of the microstructure.

[0014] Preferably, in step S5, the preheating treatment includes normalizing and a first tempering. The normalizing process involves placing the turbine disk forging into a heating furnace, first heating it to 660℃~680℃, holding it at that temperature for 2~3 hours, then continuing to heat it to 1130℃~1150℃, holding it at that temperature for 8 hours~10 hours, and then removing it from the furnace and air-cooling it to below 200℃. The first tempering process involves first heating it to 250℃~350℃, holding it at that temperature for 2~3 hours, then heating it to 660~680℃, holding it at that temperature for 10~15 hours, then cooling it in the furnace to ≤200℃, and then removing it from the furnace and air-cooling it to room temperature.

[0015] Preferably, in step S5, the time for lifting the forging from the heat treatment furnace into the water tank is less than 5 minutes; the water tank is equipped with a motor to continuously stir the water flow, thereby accelerating the cooling speed of the forging and preventing the steam film from affecting the cooling uniformity; the temperature of the oil tank is controlled at 50℃~80℃, and the cooling speed of the forging is controlled at 20~30℃ / s, so as to reduce the stress generated by the martensitic transformation and prevent the forging from cracking.

[0016] Preferably, in step S5, the performance heat treatment includes quenching and a second tempering. The quenching process involves placing the turbine disk forging into a heating furnace, heating it to 660℃~680℃, holding it for 2~3 hours, then continuing to heat it to 1080℃~1100℃, holding it for 10 hours~15 hours, then water-cooling it to 700℃~750℃, then oil-cooling it to 300℃~330℃, and finally air-cooling it to room temperature. The second tempering process involves first heating it to 250℃~350℃ and holding it for 2~3 hours; then heating it to 730~750℃ and holding it for 10~15 hours; and then furnace-cooling it to room temperature.

[0017] Compared with the prior art, the present invention has the following advantages: (1) By rationally controlling the chemical composition ratio of the wheel material elements, strictly controlling the C element content, increasing the Co element to inhibit the precipitation of δ ferrite, adding Cr, Ni, Mo, V and adding trace elements such as Nb, Ta, B, N, etc., and strictly controlling the content of harmful elements, the steel has comprehensive properties such as beneficial heat resistance, durability and oxidation resistance.

[0018] (2) Forgings are prepared by free forging + die forging, pre-forging homogenization treatment and post-forging optimized heat treatment. Multiple homogenization heat treatments further eliminate the segregation of microstructure in the forgings; the free forging + die forging mode makes the deformation of each part of the forging relatively uniform; the optimized heat treatment process further improves the comprehensive performance, and the strength and toughness of the forgings are reasonably matched; making the forgings of the present invention less prone to cracking during the preparation process, with excellent microstructure uniformity and a yield of over 96%.

[0019] (3) The forging properties obtained by this invention are as follows: room temperature tensile strength Rm≥1050MPa, yield strength RP0.2≥930MPa, elongation A≥12%, reduction of area Z≥45%, impact performance KV2≥42J, hardness HBW250~300, and the hardness of any two points in the circumferential direction of the flange does not exceed 25HBW; ductile-brittle transition temperature FATT50≤21℃; residual stress≤52MPa; tensile strength Rm≥850MPa at 450℃, yield strength RP0.2≥745MPa, elongation A≥12%, reduction of area Z≥45%; creep rupture time at 600℃ and 280MPa≥100h. This meets the requirements for the use of high-performance turbine disk forgings for gas turbines. Attached Figure Description

[0020] Figure 1 A schematic diagram of the manufacturing process for high-performance turbine disk forgings for gas turbines; Figure 2 Optimized heat treatment curves for high-performance turbine disk forgings for gas turbines; Figure 3 This is a schematic diagram of a finished high-performance turbine disk forging for gas turbines. Detailed Implementation

[0021] To facilitate understanding of the technical solution of the present invention, the following detailed description is provided in conjunction with the accompanying drawings and specific embodiments.

[0022] Example 1 The raw material composition of a high-performance turbine disk forging for gas turbines is shown in Table 1: Table 1 The method for preparing the above-mentioned high-performance turbine disk forgings for gas turbines includes the following steps: S1A: Steel ingots are produced by smelting the raw materials of wheel forgings in an alkaline electric arc furnace and then refining them through vacuum deoxidation outside the furnace.

[0023] S2A: The steel ingot is placed in a heating furnace and heated to 910℃~930℃, held for 5 hours, and then heated to 1210℃~1230℃, held for 15 hours, for the first homogenization heat treatment. The steel ingot is then pressed, chamfered, and the sprue is removed using free forging. It is then upset, drawn, and rounded. The upsetting deformation during free forging is 30%, and the drawing deformation is 60%. The billet is then cut to the required size according to the turbine disk.

[0024] S3A: The billet is placed in a heating furnace for a second homogenization heat treatment. First, the temperature is raised to 900℃~920℃ and held for 3 hours. Then, the temperature is raised to 1190℃~1210℃ and held for 9 hours. The billet is then die-forged to obtain a steel billet. The deformation of the wheel flange is 30% and the deformation of the wheel hub is 15% during die forging.

[0025] S4A: The steel billet is placed in a heating furnace for a third homogenization heat treatment. First, the temperature is raised to 860℃~880℃ and held for 2 hours. Then, the temperature is raised to 1170℃~1200℃ and held for 7 hours. The steel billet is then die-forged to obtain a turbine disc forging. The deformation of the steel billet rim is 5% and the deformation of the hub is 23% during the die-forging process.

[0026] S5A: The turbine disk forging is preheated and subjected to performance heat treatment.

[0027] The turbine disk forgings underwent preheating treatment, including normalizing and a first tempering. Normalizing involved placing the forgings in a furnace, heating to 660℃~680℃, holding for 3 hours, then further heating to 1130℃~1150℃ and holding for 10 hours. Afterward, the forgings were air-cooled to below 200℃. The first tempering process involved heating to 250℃~270℃ and holding for 3 hours; then heating to 660~680℃ and holding for 15 hours; followed by furnace cooling to ≤200℃, and then air-cooling to room temperature. The turbine disks then underwent performance heat treatment, including quenching and a second tempering. The quenching process is as follows: The turbine disk forging is placed in a heating furnace, heated to 660℃~680℃, held for 3 hours, then heated to 1080℃~1100℃ and held for 15 hours. It is then water-cooled to 700℃~750℃, oil-cooled to 300℃~330℃, and finally air-cooled to room temperature. The forging is lifted from the heat treatment furnace into the water bath within 3 minutes; the water bath is equipped with a motor to continuously agitate the water flow, accelerating the cooling rate of the forging while preventing the vapor film from affecting the cooling uniformity. During oil cooling, the temperature of the oil bath is controlled at 60℃~80℃, and the cooling rate of the forging is controlled at 20~30℃ / s to reduce the stress generated by the martensitic transformation and prevent cracking of the forging. The second tempering treatment is as follows: first, the temperature is raised to 300℃~310℃ and held for 3 hours; then, the temperature is raised to 730~750℃ and held for 15 hours; finally, it is furnace-cooled to room temperature.

[0028] Example 2 The raw material composition of a high-performance turbine disk forging for gas turbines is shown in Table 2: Table 2 The method for preparing the above-mentioned high-performance turbine disk forgings for gas turbines includes the following steps: S1B: Steel ingots are produced by smelting the raw materials of wheel forgings in an alkaline electric arc furnace and then refining them through vacuum deoxidation outside the furnace.

[0029] S2B: The steel ingot is placed in a heating furnace and heated to 890℃~910℃, held for 6 hours, and then heated to 1210℃~1230℃, held for 10 hours, for the first homogenization heat treatment. The steel ingot is then pressed, chamfered, and the sprue is removed using free forging. It is then upset, drawn, and rounded. The upsetting deformation during free forging is 45%, and the drawing deformation is 70%. The billet is then cut to the required size according to the turbine disk.

[0030] S3B: The billet is placed in a heating furnace for a second homogenization heat treatment. First, the temperature is raised to 870℃~890℃ and held for 2 hours. Then, the temperature is raised to 1190℃~1210℃ and held for 7 hours. The billet is then die-forged to obtain a steel billet. The deformation of the wheel flange is 40% and the deformation of the wheel hub is 20% during die forging.

[0031] S4B: The steel billet is placed in a heating furnace for a third homogenization heat treatment. First, the temperature is raised to 880℃~900℃ and held for 3 hours. Then, the temperature is raised to 1170℃~1200℃ and held for 5 hours. The steel billet is then die-forged to obtain a turbine disc forging. The deformation of the steel billet rim is 7% and the deformation of the hub is 28% during the die-forging process.

[0032] S5B: The turbine disk forging is preheated and subjected to performance heat treatment.

[0033] The turbine disk forgings underwent preheating treatment, including normalizing and a first tempering. Normalizing involved placing the forgings in a furnace, heating to 660℃~680℃, holding for 2 hours, then further heating to 1130℃~1150℃ and holding for 8 hours. Afterwards, the forgings were air-cooled to below 200℃. The first tempering process involved heating to 300℃~320℃ and holding for 2 hours; then heating to 660~680℃ and holding for 10 hours; followed by furnace cooling to ≤200℃, and then air-cooling to room temperature. The turbine disks then underwent performance heat treatment, including quenching and a second tempering. The quenching process is as follows: The turbine disk forging is placed in a heating furnace, heated to 660℃~680℃, held for 2 hours, then heated to 1080℃~1100℃ and held for 10 hours. It is then water-cooled to 700℃~750℃, oil-cooled to 310℃~330℃, and finally air-cooled to room temperature. The forging is lifted from the heat treatment furnace into the water bath within 4 minutes; the water bath is equipped with a motor to continuously agitate the water flow, accelerating the cooling rate of the forging while preventing the vapor film from affecting the cooling uniformity. During oil cooling, the temperature of the oil bath is controlled at 50℃~70℃, and the cooling rate of the forging is controlled at 20~30℃ / s to reduce the stress generated by the martensitic transformation and prevent the forging from cracking. The second tempering treatment is as follows: first, the temperature is raised to 320℃~340℃ and held for 2 hours; then, the temperature is raised to 730~750℃ and held for 2 hours; finally, it is furnace-cooled to room temperature.

[0034] Comparative Example 1 The raw material composition of a high-performance turbine disk forging for gas turbines is shown in Table 3: Table 3 The method for preparing the above-mentioned high-performance turbine disk forgings for gas turbines includes the following steps: S100A: Steel ingots are produced by smelting the raw materials of wheel forgings in an alkaline electric arc furnace and then refining them through vacuum deoxidation outside the furnace.

[0035] S200A: The steel ingot is placed in a heating furnace and heated to 910℃~930℃, held for 5 hours, and then heated to 1210℃~1230℃, held for 15 hours, for the first homogenization heat treatment. The steel ingot is then pressed, chamfered, and the sprue is removed using free forging. It is then upset, drawn, and rounded. The upsetting deformation during free forging is 30%, and the drawing deformation is 60%. The billet is then cut to the required size according to the turbine disk.

[0036] S300A: The billet is placed in a heating furnace for a second homogenization heat treatment. First, the temperature is raised to 900℃~920℃ and held for 3 hours. Then, the temperature is raised to 1190℃~1210℃ and held for 9 hours. The billet is then die-forged to obtain a steel billet. The deformation of the wheel flange is 30% and the deformation of the wheel hub is 15% during die forging.

[0037] S400A: The steel billet is placed in a heating furnace for a third homogenization heat treatment. First, the temperature is raised to 860℃~880℃ and held for 2 hours. Then, the temperature is raised to 1170℃~1200℃ and held for 7 hours. The steel billet is then die-forged to obtain a turbine disc forging. The deformation of the steel billet rim is 5% and the deformation of the hub is 23% during the die-forging process.

[0038] S500A: The turbine disk forging is preheated and subjected to performance heat treatment.

[0039] The turbine disk forgings were preheated, including normalizing and a first tempering. Normalizing involved placing the forgings in a furnace, heating them to 660℃~680℃, holding for 3 hours, then further heating to 1130℃~1150℃ and holding for 10 hours. Afterwards, the forgings were air-cooled to below 200℃. The first tempering involved heating to 250℃~270℃ and holding for 3 hours; then heating to 660~680℃ and holding for 15 hours; finally, the forgings were furnace-cooled to ≤200℃ and then air-cooled to room temperature.

[0040] The turbine disk is then subjected to performance heat treatment, including quenching and a second tempering. The quenching process involves placing the turbine disk forging into a heating furnace, heating it to 660℃~680℃, holding it for 3 hours, then continuing heating to 1080℃~1100℃, holding it for 15 hours, then water-cooling it to 700℃~750℃, followed by oil cooling to 300℃~330℃, and finally air-cooling to room temperature. The forging is lifted from the heat treatment furnace into the water bath within 3 minutes; the water bath is equipped with a motor to continuously agitate the water flow, accelerating the cooling rate of the forging while preventing the vapor film from affecting the cooling uniformity. During oil cooling, the temperature of the oil bath is controlled at 60℃~80℃, and the cooling rate of the forging is controlled at 20~30℃ / s to reduce the stress generated by the martensitic transformation and prevent cracking of the forging. The second tempering process is as follows: first, heat the furnace to 300℃~310℃ and hold for 3 hours; then heat the furnace to 730~750℃ and hold for 15 hours; then cool the furnace to room temperature.

[0041] Comparative Example 2 The raw material composition of a high-performance turbine disk forging for gas turbines is shown in Table 4: Table 4 The method for preparing the above-mentioned high-performance turbine disk forgings for gas turbines includes the following steps: S100B: Steel ingots are produced by smelting the raw materials of wheel forgings in an alkaline electric arc furnace and then refining them through vacuum deoxidation outside the furnace.

[0042] S200B: The steel ingot is placed in a heating furnace and heated to 890℃~910℃, held for 6 hours, and then heated to 1130℃~1150℃, held for 2 hours, for the first homogenization heat treatment. The steel ingot is then pressed, chamfered, and the sprue is removed using free forging. It is then upset, drawn, and rounded. The upsetting deformation during free forging is 45%, and the drawing deformation is 70%. The billet is then cut to the required size according to the turbine disk.

[0043] S300B: The billet is placed in a heating furnace for a second homogenization heat treatment. First, the temperature is raised to 870℃~890℃ and held for 2 hours. Then, the temperature is raised to 1100℃~1120℃ and held for 2 hours. The billet is then die-forged to obtain a steel billet. The deformation of the wheel flange is 40% and the deformation of the wheel hub is 20% during die forging.

[0044] S400B: The steel billet is placed in a heating furnace for a third homogenization heat treatment. First, the temperature is raised to 880℃~900℃ and held for 3 hours. Then, the temperature is raised to 1110℃~1130℃ and held for 2 hours. The steel billet is then die-forged to obtain a turbine disc forging. The deformation of the steel billet rim is 7% and the deformation of the hub is 28% during the die-forging process.

[0045] S500B: The turbine disk forging is preheated and subjected to performance heat treatment.

[0046] The turbine disk forgings underwent preheating treatment, including normalizing and a first tempering. Normalizing involved placing the forgings in a furnace, heating to 660℃~680℃, holding for 2 hours, then further heating to 1130℃~1150℃ and holding for 8 hours. Afterwards, the forgings were air-cooled to below 200℃. The first tempering process involved heating to 300℃~320℃ and holding for 2 hours; then heating to 660~680℃ and holding for 10 hours; followed by furnace cooling to ≤200℃, and then air-cooling to room temperature. The turbine disks then underwent performance heat treatment, including quenching and a second tempering. The quenching process is as follows: The turbine disk forging is placed in a heating furnace, heated to 660℃~680℃, held for 2 hours, then heated to 1010℃~1030℃, held for 3 hours, then oil-cooled to 310℃~330℃, and finally air-cooled to room temperature. The second tempering process is as follows: First, the temperature is raised to 320℃~340℃ and held for 2 hours; then the temperature is raised to 690~710℃ and held for 2 hours; then furnace-cooled to room temperature.

[0047] Mechanical properties of the turbine disk forgings obtained in Examples 1-2 and Comparative Examples 1-2 were tested. Room temperature and high temperature tensile properties were tested according to GB / T 228.1—2010 Metallic Materials—Tensive Testing—Part 1: Room Temperature Test Method and GB / T 228.2—2015 Metallic Materials—Tensive Testing—Part 2: High Temperature Test Method, respectively; impact energy and ductile-brittle transition temperature were tested according to GB / T 229—2007 Metallic Materials—Charpy Pendulum Impact Test Method; hardness was tested according to GB / T 231.1—2018 Metallic Materials—Britton Hardness Test—Part 1: Test Method; short-term creep was tested according to GB / T 2039-2012 Metallic Materials—Uniaxial Tensile Creep Test Method; residual stress was tested according to JB / T 8888—2018 Test Method for Measuring Residual Stress in Steam Turbine and Steam Generator Rotor Forgings using the Ring Core Method. The test results are shown in Tables 5 and 6.

[0048] Table 5 Table 6 As shown in Tables 5-6, the forgings prepared in this invention meet the requirements for high-performance turbine disk forgings for gas turbines. However, the forgings in Comparative Example 1, although produced using the same process as in Example 1, have different chemical compositions. Specifically, the C and V elements exceed the specified upper limits, and Nb, Ta, B, and N elements are not added. Although the plasticity, impact resistance, hardness, and uniformity meet the technical requirements, the tensile strength, creep rupture properties, and FATT of the forgings are inferior. 50The forgings failed to meet the technical requirements for high-performance turbine disk forgings used in gas turbines. While the forgings in Comparative Example 2 used the same chemical composition as those in Example 2, the forging manufacturing process differed. Specifically, the homogenization heat treatment temperatures and holding times were insufficient, the quenching temperature was low, the holding time was short, and water cooling and temperature control during the quenching process were not implemented. Additionally, the tempering temperature was low. This resulted in the turbine disk forgings meeting the room temperature tensile strength requirements, but exhibiting deficiencies in room temperature plasticity, high-temperature tensile strength, impact resistance, and FATT (Flattement-to-Temperature) performance. 50、 The durability and residual stress did not meet the requirements. Therefore, the synergistic effect of the element ratio and preparation process in this invention enables the forging material properties to meet the requirements for high-performance turbine disk forgings for gas turbines.

[0049] The above are merely preferred embodiments of the present invention. The scope of protection of the present invention shall be determined by the scope defined in the claims. Any improvements and modifications made by those skilled in the art without departing from the spirit and scope of the present invention shall also be considered as within the scope of protection of the present invention.

Claims

1. A high-performance turbine disk forging for gas turbines, characterized in that, The raw material composition of the wheel forging, by weight percentage, includes: C: 0.08-0.16%, Si≤0.12%, Mn≤1.03%, Ni: 1.95-2.55%, Cr: 9.65-10.25%, Mo: 0.53-1.15%, V: 0.14-0.26%, Nb: 0.03-0.07%, Ta: 0.01-0.05%, B: 0.0005%-0.0060%, N: 0.005-0.035%, Al≤0.02%, P≤0.015%, S≤0.015%, Sb≤0.0015%, Cu≤0.10%, Sn≤0.013%, As≤0.017%, with the remainder being Fe.

2. The high-performance turbine disk forging for gas turbines according to claim 1, characterized in that, The raw material composition of the wheel forging, by weight percentage, includes: C: 0.09%, Si: 0.05%, Mn: 0.91%, Ni: 2.15%, Cr: 9.85%, Mo: 0.77%, V: 0.16%, Nb: 0.05%, Ta: 0.02%, B: 0.0012%, N: 0.007%, Al: 0.005%, P: 0.007%, S: 0.008%, Sb: 0.008%, Cu: 0.07%, Sn: 0.006%, As: 0.004%, with the remainder being Fe.

3. The high-performance turbine disk forging for gas turbines according to claim 1, characterized in that, The raw material composition of the wheel forging, by weight percentage, includes: C: 0.10%, Si: 0.06%, Mn: 1.00%, Ni: 2.45%, Cr: 10.0%, Mo: 0.89%, V: 0.23%, Nb: 0.03%, Ta: 0.04%, B: 0.002%, N: 0.02%, Al: 0.01%, P: 0.009%, S: 0.009%, Sb: 0.005%, Cu: 0.04%, Sn: 0.008%, As: 0.009%, with the remainder being Fe.

4. A method for preparing a high-performance turbine disk forging for a gas turbine, characterized in that, Includes the following steps: S1: The raw material composition of the wheel forging according to any one of claims 1-3 is smelted into steel ingots; S2: The steel ingot is forged by free forging and cut into blanks according to the required size of the turbine disk; S3: The billet is die-forged to obtain a steel billet; S4: The steel billet is die-forged to obtain the turbine disk forging; S5: Preheat and perform performance heat treatment on the turbine disk forging.

5. The method for preparing a high-performance turbine disk forging for gas turbines according to claim 4, characterized in that, In step S2, the steel ingot obtained in step S1 needs to undergo a first homogenization treatment before free forging. The first homogenization process uses a stepped heating method: the steel ingot is placed in a heating furnace and heated to 880℃~930℃, held for 4~6 hours, and then heated to 1180℃~1230℃, held for 10 hours~15 hours; during free forging, the steel ingot needs to be pressed, chamfered, and the sprue removed, and then upset, drawn, and rounded. The upsetting deformation during the free forging process is 20% to 50%, and the elongation deformation is 25% to 70%.

6. The method for preparing a high-performance turbine disk forging for gas turbines according to claim 4, characterized in that, In step S3, during die forging, the billet undergoes a second homogenization treatment before forging. This second homogenization treatment employs a stepped heating method: the billet is placed in a heating furnace and heated to 870℃~920℃, held for 2~3 hours, and then further heated to 1190℃~1210℃, held for 6 hours~10 hours. The deformation of the billet flange is 25%~50%, and the deformation of the hub is 10%~20%.

7. The method for preparing a high-performance turbine disk forging for gas turbines according to claim 4, characterized in that, In step S4, when performing die forging, the steel billet undergoes a third homogenization treatment before die forging. The third homogenization process adopts a stepped heating method: the steel billet is placed in a heating furnace and heated to 860℃~900℃, held for 2~3 hours, and then heated to 1170℃~1200℃, held for 5 hours~8 hours; in the die forging process, the flange deformation is 3%~9%, and the hub deformation is 20%~30%.

8. The method for preparing a high-performance turbine disk forging for gas turbines according to claim 4, characterized in that, In step S5, the preheating treatment includes normalizing and a first tempering; Normalizing is as follows: The turbine disk forging is placed in a heating furnace, heated to 660℃~680℃, held for 2~3 hours, and then heated to 1130℃~1150℃, held for 8 hours~10 hours, and then removed from the furnace and air-cooled to below 200℃. The first tempering process is as follows: first, heat to 250℃~350℃ and hold for 2~3 hours; then heat to 660~680℃ and hold for 10~15 hours; then cool with the furnace to ≤200℃, and then remove from the furnace and air cool to room temperature.

9. The method for preparing a high-performance turbine disk forging for gas turbines according to claim 8, characterized in that, In step S5, the time for lifting the forging from the heat treatment furnace into the water tank is less than 5 minutes; the water tank is equipped with a motor to continuously agitate the water flow; the temperature of the oil tank is controlled at 50℃~80℃, and the cooling rate of the forging is controlled at 20~30℃ / s.

10. The method for preparing a high-performance turbine disk forging for gas turbines according to claim 8, characterized in that, In step S5, the performance heat treatment includes quenching and a second tempering; The quenching process is as follows: the turbine disk forging is placed in a heating furnace, heated to 660℃~680℃, held for 2~3 hours, then heated to 1080℃~1100℃, held for 10 hours~15 hours, then water-cooled to 700℃~750℃, then oil-cooled to 300℃~330℃, and finally air-cooled to room temperature. The second tempering process is as follows: first, the temperature is raised to 250℃~350℃ and held for 2~3 hours; then the temperature is raised to 730~750℃ and held for 10~15 hours; then the furnace is cooled to room temperature.

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