Isothermal forging method for 3D printing billet of nickel-based superalloy dual-property disk-shaped forging

Abstract

The application discloses an isothermal forging method for a 3D printing blank of a nickel-based high-temperature alloy double-performance disc-shaped forging, and the steps are as follows: firstly, a 3D printing nickel-based high-temperature alloy powder is used to prepare a raw disc blank, then the raw disc blank is forged into an intermediate blank as a whole through first isothermal forging, a first gradient grain size is obtained, the overall grain size of the intermediate blank reaches 7-9 levels, and high-temperature durability and creep performance are good; then the blade pre-forging blank of the intermediate blank is forged into the blade of the disc-shaped forging in a local manner through second isothermal forging, a second gradient grain size is obtained, the grain size of the blade part of the disc-shaped forging reaches 11-12 levels, high-cycle fatigue performance and vibration resistance are good, and finally the disc-shaped forging is completed. The above-mentioned overall + local forging method is used to isothermally forge the double-performance disc-shaped forging on a single alloy blank body, and the method is mainly used for forming of a nickel-based high-temperature alloy double-performance disc-shaped forging of an aero-engine.

Description

Technical Field

[0001] This invention relates to a forging method for high-temperature alloy forgings, and more particularly to an isothermal forging method for 3D-printed blanks of nickel-based high-temperature alloy dual-performance disc forgings. Background Technology

[0002] High-temperature alloy disc forgings for aero-engines, such as integral bladed disk forgings for compressors, have the following structure: from the center hole to the outer edge, they are sequentially connected as a hub, spokes, rim, and blades. The rim is composed of an upper drum and a lower drum. To meet the demands of extreme working environments such as high temperature, high stress, high speed, and high-speed airflow, the disc forging requires good high-temperature durability and creep resistance for the hub, spokes, and rim, where failure modes are mainly creep deformation and crack initiation. Meanwhile, the blades, which rotate at high speed, experience high vibration, and are subjected to significant impacts from centrifugal force and air pressure, require good high-cycle fatigue resistance and vibration resistance. In other words, the performance requirements for the hub, spokes, and rim differ from those for the blades. The "dual performance" mentioned in this invention refers to the performance requirements of both the hub, spokes, and rim and the blades.

[0003] It is impossible to directly print dual-performance disc forgings of nickel-based superalloys using 3D printing. Because 3D printing relies on powder solidification point by point and layer by layer, it can only obtain disc forgings with single properties. Moreover, 3D printing has defects such as incomplete powder fusion and porosity. In addition, the high residual stress and poor plasticity of the parts make them prone to fatigue fracture.

[0004] Dual-performance disc forgings are divided into dual-alloy dual-performance disc forgings and single-alloy dual-performance disc forgings. For the dual-performance disc forgings described in this invention, if a dual-alloy manufacturing process is used, a durable, creep-resistant coarse-grained alloy is needed to make the hub, spokes, and rim, while a high-strength, fine-grained alloy is used to make the blades. The two parts are then joined together by welding, hot isostatic pressing, or other methods. However, crack initiation easily forms at the joint between the two alloys.

[0005] Single-alloy dual-performance disc forgings do not have crack initiation issues as long as they are integrally forged. However, the required grain size gradient distribution cannot be achieved using integral forging methods. For example, Chinese invention patent specification CN101036931A, published on September 19, 2007, discloses a near-isothermal forging method for GH4169 alloy disc forgings in air. The process is as follows: heating the original GH4169 alloy bar to 995℃~1005℃, then using upsetting + punching + rolling to produce a GH4169 fine-grained blank; heating the fine-grained blank to 995℃~1005℃ and the forging die to 950℃~965℃ respectively; positioning the fine-grained blank in the die; simultaneously heating the fine-grained blank and the forging die to maintain their heating temperatures; and forging at a forging pressure of 55MN~65MN and 0.01s... -1 ~0.05s -1 A fine-grained blank is forged using a forging die at a strain rate of [specific value] to obtain a GH4169 alloy disc forging with fine grains, high strength, and a relatively complex shape. The shape of this disc forging is very similar to that of the disc forging described in this invention, but it is a single-performance disc forging with a more complex billet preparation process and a simpler billet shape.

[0006] Single-alloy dual-performance disc forgings are typically obtained using a gradient heat treatment process. For example, Chinese invention patent specification CN106514150A, published on March 22, 2017, discloses a method for manufacturing a Ti60 alloy dual-performance integral bladed disk. The steps are as follows: Ti60 alloy bars are upset twice and then punched to obtain a secondary blank; the secondary blank is machined to obtain a tertiary blank; the tertiary blank is plastically deformed under a press to obtain the bladed disk forging; the bladed disk forging is heated together in a heat-insulating device to obtain an integral bladed disk with different microstructures, where the hub exhibits a good basketweave structure, while the rim exhibits a two-phase processing structure. This method first obtains a uniformly structured disc forging through forging, and then establishes a gradient temperature field on the disc forging during subsequent gradient heat treatment, resulting in different microstructures in the hub and rim. However, this gradient heat treatment process requires complex tooling and demanding precise control of the temperature gradient.

[0007] Chinese invention patent specification CN110788562A, published on February 14, 2020, discloses a method for manufacturing a nickel-based alloy dual-performance integral bladed disk. The steps are as follows: Forging a GH4169 alloy bar with a forged state of Φ100mm×150mm using isothermal forging at a forging speed of 0.02mm / s and a deformation rate of 60%; the mold heating temperature and the nickel-based alloy bar heating temperature are both 1010℃, producing a uniform, fine-grained GH4169 alloy disk hub blank for the dual-performance integral bladed disk. After machining, the blank has dimensions of Φ140mm×50mm; Φ0. An 8mm GH4169 alloy welding wire, focused by an electron beam gun, is deposited layer by layer onto a GH4169 alloy disk blank according to the inlet and outlet profiles of the blades, resulting in an integral bladed disk blank. The additively manufactured GH4169 alloy integral bladed disk blank, coated with glass lubricant, is heated to 1010℃ and held at that temperature. The held-temperature integral bladed disk blank is then isothermally forged in a forging die. The die heating temperature is the same as the blank heating temperature, the forging speed is 0.6mm / s, the reduction h is 8mm, and the deformation is 16%. After isothermal forging, an integral bladed disk forging is obtained. This method first produces a fine-grained disk blank through large-deformation isothermal forging, then prepares coarse-grained columnar-crystal blade blanks on the disk blank using electron beam wire additive manufacturing, and finally performs small-deformation isothermal forging on the integral bladed disk blank to obtain a dual-performance integral bladed disk forging. The integral bladed disk forging prepared by this method belongs to the single alloy dual-performance disk forging. However, since the hub and blades are connected by electron beam wire addition manufacturing, crack sources are also prone to form at the connection. These crack sources are brought about during the electron beam wire addition manufacturing process and are difficult to eliminate by isothermal forging with small deformation.

[0008] In summary, for single-alloy dual-performance disc forgings, how to isothermally forge dual-performance disc forgings on a single billet body has become a key research and development direction. Summary of the Invention

[0009] The technical problem to be solved by the present invention is to provide an isothermal forging method for 3D printing blanks of nickel-based superalloy dual-performance disc forgings by using integral forging of the original disc blank and partial forging of the intermediate blank. The method forges dual-performance disc forgings on a nickel-based superalloy blank body through two isothermal forging deformations.

[0010] To solve the above-mentioned technical problems, the isothermal forging method for 3D printed blanks of nickel-based superalloy dual-performance disc forgings of the present invention includes the following steps:

[0011] Nickel-based high-temperature alloy powder is 3D printed to form a blank, which is then subjected to stress-relief annealing. The blank is formed by connecting hub spoke blanks and rim blanks from the center hole to the outer edge. The rim blank is composed of an upper drum blank and a lower drum blank.

[0012] An intermediate billet mold for disc forgings is provided. The intermediate billet mold mainly consists of an upper billet mold and a lower billet mold. After the upper billet mold and the lower billet mold are closed, an intermediate billet cavity is formed. The upper billet mold consists of an upper billet mold core block and an upper billet mold sleeve block fitted around the outer edge of the upper billet mold core block. The lower billet mold mainly consists of a lower billet mold core block and a lower billet mold sleeve block fitted around the outer edge of the lower billet mold core block. A lower billet mold top block is installed in the central hole of the lower billet mold core block. After the upper billet mold and the lower billet mold are closed, the top surface of the lower billet mold top block contacts the bottom surface of the upper billet mold core block.

[0013] Under an inert gas protective atmosphere, the original blank and the opened intermediate blank mold are first preheated to a surface temperature of 150℃±5℃. Lubricant is then evenly sprayed onto the surfaces of the original blank and the intermediate blank cavity. The original blank and the intermediate blank mold are then heated to 1020℃±5℃. The original blank is then loaded into the intermediate blank mold so that it is located inside the intermediate blank cavity. The upper concave surface of the original blank is tightly fitted with the bottom corner surface of the upper blank mold core block, and the lower concave surface of the original blank is tightly fitted with the top corner surface of the lower blank mold core block. The original blank is firmly pressed onto the lower blank mold core block by the upper blank mold core block, thus completing the loading and positioning of the original blank in the intermediate blank mold.

[0014] Start the forging press to close the upper and lower dies. The forging press applies a pressure of 30MN to 50MN to the original blank through the intermediate blank die, causing the original blank to move at a speed of 0.1 within the intermediate blank cavity. After being pressed at a uniform and slow speed of 0.2 mm / s to 0.2 mm / s for 50% deformation, it becomes an intermediate billet. The intermediate billet is formed by connecting the hub, spokes, rim pre-forged billet and blade pre-forged billet in sequence from the center hole to the outer edge. The rim pre-forged billet is composed of an upper drum pre-forged billet and a lower drum pre-forged billet. The hub and spokes of the intermediate billet are the same as those of the disc forging. The thickness of the rim pre-forged billet of the intermediate billet is the same as that of the rim of the disc forging. The inner and outer diameters of the upper drum pre-forged billet of the intermediate billet are the same as those of the upper drum of the disc forging. The inner and outer diameters of the lower drum pre-forged billet of the intermediate billet are the same as those of the lower drum of the disc forging.

[0015] A disc-shaped forging die is provided, which mainly consists of an upper forging die and a lower forging die. After the upper and lower forging dies are closed, a disc-shaped forging cavity is formed. The upper forging die consists of an upper forging die core block and an upper forging die sleeve block fitted around the outer edge of the upper forging die core block. The lower forging die mainly consists of a lower forging die core block and a lower forging die sleeve block fitted around the outer edge of the lower forging die core block. A lower forging die top block is installed in the central hole of the lower forging die core block. After the upper and lower forging dies are closed, the top surface of the lower forging die top block contacts the bottom surface of the upper forging die core block.

[0016] The upper and lower end faces of the intermediate billet from the hub and spokes to the rim pre-forged billet are wrapped with a heat insulation layer, leaving only the blade pre-forged billet exposed.

[0017] Under an inert gas protective atmosphere, the blade pre-forging blank of the intermediate billet and the open disc forging mold are first preheated to a surface temperature of 150℃±5℃. Lubricant is then evenly sprayed onto the upper and lower end faces and outer edge faces of the blade pre-forging blank of the intermediate billet and the surface of the disc forging cavity. The blade pre-forging blank of the intermediate billet and the disc forging mold are then heated to 995℃±5℃. After that, the heat insulation layer covering the intermediate billet is removed.

[0018] The intermediate billet is loaded into the disc forging mold so that it is located in the cavity of the disc forging mold. The center hole of the intermediate billet is fitted into the top circular module of the lower forging mold top block. The bottom module of the upper forging mold sleeve block presses against the upper end face of the blade pre-forging billet of the intermediate billet. The middle module of the lower forging mold sleeve block presses against the lower end face of the blade pre-forging billet of the intermediate billet, thus completing the loading and positioning of the intermediate billet in the disc forging mold.

[0019] Start the forging press to close the upper and lower forging dies. The forging press applies a pressure of 30MN to 50MN to the blade pre-forging blank of the intermediate billet through the bottom module of the upper forging die sleeve and the middle module of the lower forging die sleeve of the disc forging die. This causes the blade pre-forging blank of the intermediate billet to be uniformly and rapidly pressed and deformed by 55% at a pressing speed of 1 mm / s to 1.5 mm / s in the cavity of the disc forging die, thus becoming the blade of the disc forging and completing the final forging of the disc forging.

[0020] The material grade of the nickel-based superalloy is GH4169.

[0021] The particle size of the nickel-based superalloy powder is 100 mesh to 300 mesh.

[0022] The stress-relief annealing of the original billet involves heating the original billet to 850°C, holding it at that temperature for 24 hours, and then air-cooling it.

[0023] The inert gas protective atmosphere refers to argon gas with a pressure of 0.04 MPa to 0.05 MPa filling the sealed forging chamber as a protective atmosphere.

[0024] The lubricant used for spraying is a glass lubricant.

[0025] The insulation layer that encloses the intermediate blank is an aluminum silicate fiber insulation layer.

[0026] The dimensional relationships between the disc forging, the original disc billet, and the intermediate billet are as follows:

[0027] ① d3=D03=D3; d6=D06=D6; D02=D2; D04=D4; D05=D5; D07=D7; H04=H4; H05=H5; H0=H;

[0028] In the formula:

[0029] d3 is the inner diameter of the lower drum blank of the original disc blank rim blank;

[0030] D03 is the inner diameter of the lower drum pre-forged billet of the intermediate billet rim pre-forged billet;

[0031] D3 is the inner diameter of the lower drum of the disc forging rim;

[0032] d6 is the inner diameter of the upper drum cylinder blank of the original disc blank rim blank;

[0033] D06 is the inner diameter of the upper drum cylinder pre-forged billet of the intermediate billet rim pre-forged billet;

[0034] D6 is the inner diameter of the upper drum of the disc forging rim;

[0035] D02 is the outer diameter of the lower drum pre-forged billet of the intermediate billet rim pre-forged billet;

[0036] D2 is the outer diameter of the lower drum of the disc forging rim;

[0037] D04 is the outer diameter of the intermediate blank hub;

[0038] D4 is the outer diameter of the disc-shaped forged wheel hub;

[0039] D05 is the diameter of the center hole in the intermediate billet;

[0040] D5 is the diameter of the center hole in the disc-shaped forging;

[0041] D07 is the outer diameter of the upper drum cylinder pre-forged billet of the intermediate billet rim pre-forged billet;

[0042] D7 is the outer diameter of the upper drum of the disc forging rim;

[0043] H04 is the thickness of the intermediate blank hub;

[0044] H4 is the thickness of the disc-shaped forged wheel hub;

[0045] H05 is the thickness of the intermediate billet spokes;

[0046] H5 is the thickness of the spokes of the disc forging;

[0047] H0 is the overall thickness of the intermediate billet from the top end face to the bottom end face;

[0048] H is the overall thickness of the disc-shaped forging from the top end face to the bottom end face;

[0049] ② h4×2÷(H04+H05)≥λ1;h÷H0≥λ2;D1÷d1≥λ3;d5÷D05≥λ4;and H04=H4、H05=H5、H0=H、D05=D5;

[0050] In the formula:

[0051] λ1, λ2, λ3, and λ4 are deformation coefficients with the following values: λ1 = 2.4, λ2 = 1.33, λ3 = 1.2, and λ4 = 2.

[0052] h4 is the thickness of the hub spoke plate blank of the original disc blank;

[0053] H04 is the thickness of the intermediate blank hub;

[0054] H4 is the thickness of the disc-shaped forged wheel hub;

[0055] H05 is the thickness of the intermediate billet spokes;

[0056] H5 is the thickness of the spokes of the disc forging;

[0057] h is the total thickness of the original blank from the top end face to the bottom end face;

[0058] H0 is the overall thickness of the intermediate billet from the top end face to the bottom end face;

[0059] H is the overall thickness of the disc-shaped forging from the top end face to the bottom end face;

[0060] D1 is the outer diameter of the disc-shaped forging;

[0061] d1 is the outer diameter of the original blank;

[0062] d5 is the diameter of the center hole of the original blank;

[0063] D05 is the diameter of the center hole in the intermediate billet;

[0064] D5 is the diameter of the center hole in the disc-shaped forging;

[0065] ③ d2÷D05=K(D01÷d1;and D05=D5;

[0066] In the formula:

[0067] K is the filling rate coefficient, with a value of 1.85;

[0068] d2 is the outer diameter of the lower drum blank of the original disc blank rim blank;

[0069] D05 is the diameter of the center hole in the intermediate billet;

[0070] D5 is the diameter of the center hole in the disc-shaped forging;

[0071] D01 is the outer diameter of the intermediate billet;

[0072] d1 is the outer diameter of the original blank;

[0073]

[0074] In the formula:

[0075] w1 and w2 are instability coefficients, with values ​​of w1=4 and w2=3.

[0076] α1 is the downward inclination angle of the outer edge of the original disc blank;

[0077] α2 is the upward inclination angle of the outer edge of the original disc blank;

[0078] h is the total thickness of the original blank from the top end face to the bottom end face;

[0079] h1 is the thickness of the outer edge of the upper drum blank of the original disc blank;

[0080] h3 is the thickness of the outer edge of the lower drum blank of the original disc blank;

[0081] d2 is the outer diameter of the lower drum blank of the original disc blank rim blank;

[0082] d3 is the inner diameter of the lower drum blank of the original disc blank rim blank;

[0083] d6 is the inner diameter of the upper drum cylinder blank of the original disc blank rim blank;

[0084] d7 is the outer diameter of the upper drum cylinder blank of the original disc blank rim blank;

[0085] ⑤ H02÷H2≥λ5;

[0086] In the formula:

[0087] λ5 is the deformation coefficient, and its value is: λ5 = 2.2;

[0088] H02 is the thickness of the blade pre-forging billet in the intermediate billet;

[0089] H2 is the thickness of the disc-shaped forging blade.

[0090] After forging, the disc forging is subjected to solution treatment and aging treatment. The solution treatment involves heating the disc forging to 980℃±5℃, holding it at that temperature for 3 hours, and then air cooling it. The aging treatment involves heating the solution-treated disc forging to 720±5℃, holding it at that temperature for 8.5 hours, then furnace cooling it to 620℃ at a rate of 50℃ / h, holding it at that temperature for 8 hours, and then air cooling it.

[0091] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0092] The isothermal forging method for 3D-printed blanks of nickel-based superalloy dual-performance disc forgings described in this invention first uses 3D-printed nickel-based superalloy powder to create a blank. Then, through a first isothermal forging, the blank is integrally forged into an intermediate blank, achieving the first gradient grain size. The overall grain size of the intermediate blank reaches level 7-9, exhibiting good high-temperature creep resistance and other properties. Next, through a second isothermal forging, the blade pre-forged blank of the intermediate blank is partially forged into the blades of the disc forging, achieving the second gradient grain size. The grain size of the blade portion of the disc forging reaches level 11-12, exhibiting good high-cycle fatigue resistance and vibration resistance. By employing the above-mentioned integral + partial forging method, the required grain size gradient distribution is achieved on a single disc forging, realizing the isothermal forging of a dual-performance disc forging from a single alloy blank body. Compared to dual-alloy dual-performance disc forgings which are joined using welding and hot isostatic pressing, and single-alloy dual-performance disc forgings which are joined using electron beam fusion additive manufacturing, the latter addresses the issue of crack initiation. Furthermore, the gradient heat treatment process for single-alloy dual-performance disc forgings eliminates complex tooling, simplifies operations, and requires less stringent temperature gradient control. Moreover, directly forging a single-alloy dual-performance disc forging from a single-alloy billet significantly improves the overall performance of the disc forging, enabling it to meet the requirements of the extremely harsh operating environment of aero-engines and facilitating their upgrade and replacement.

[0093] This invention utilizes 3D printing to produce a blank, which is designed according to the shape of a disc forging. From the center hole to the outer edge, it is sequentially formed by connecting a hub spoke blank and a rim blank, overcoming the problems of complex blank-making processes and simple blank shapes in existing technologies. Furthermore, the hub spoke blank of the blank is formed into the hub and spokes of the disc forging through isothermal forging in an inert gas atmosphere for the first time. The rim blank of the blank is ultimately formed into the rim and blades of the disc forging through isothermal forging in the first and second times under an inert gas atmosphere. This part-to-part forming method and isothermal forging under an inert gas atmosphere eliminate the cold mold effect, achieving superplastic forming. This helps reduce the deformation resistance of difficult-to-deform nickel-based high-temperature alloys, overcomes the problem of poor plasticity in 3D printed blanks, releases residual stress generated by 3D printed blanks, compacts defects such as incomplete fusion and porosity of 3D printed powder, and improves the forging forming rate. In other words, it enables high-quality forging of 3D printed powder blanks.

[0094] This invention, through the creative design of the original disc blank, intermediate blank, and the dimensional matching relationship between the original disc blank, intermediate blank and disc forging, obtains the shape and size of the original disc blank and the optimal intermediate blank suitable for 3D printing of this invention. This is beneficial for realizing material-separated forging, improving the uniformity of blank deformation, the safety of blank filling, and obtaining forgings with uniform structure and properties. Attached Figure Description

[0095] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0096] Figure 1 This is a structural diagram of the nickel-based high-temperature alloy dual-performance disc forging described in this invention.

[0097] Figure 2 This is a structural diagram of the original disc blank made by 3D printing nickel-based high-temperature alloy powder.

[0098] Figure 3 This is a structural diagram of the intermediate billet mold for the disc-shaped forging described in this invention.

[0099] Figure 4 yes Figure 2 The original blank shown is loaded into Figure 3 The assembly diagram of the intermediate blank mold is shown.

[0100] Figure 5 It is Figure 2 The diagram shows the structure of the intermediate billet formed by forging the original disc billet.

[0101] Figure 6 It is used for forging Figure 1 The mold for the disc-shaped forging shown.

[0102] Figure 7 yes Figure 5 The diagram shows an intermediate blank wrapped with an aluminum silicate fiber insulation layer.

[0103] Figure 8 yes Figure 5 The intermediate billet shown is loaded into Figure 6 The assembly drawing of the disc-shaped forging mold is shown. Detailed Implementation

[0104] To implement the isothermal forging method for 3D printed blanks of nickel-based high-temperature alloy dual-performance disc forgings described in this invention, it is necessary to provide related equipment and facilities such as 3D printers, forging presses, heating devices, robotic arms, and protective atmosphere isothermal forging chambers.

[0105] The following describes the process steps of the present invention in detail using nickel-based high-temperature alloy powder with material grade GH4169 as an example.

[0106] The composition of the alloy powder is controlled as follows (weight percentage %): C 0.02-0.06%, Cr 17.0-21.0%, Ni 50.0-55.0%, Co ≤1.0%, Mo 2.80-3.30%, Al 0.30-0.70%, Ti 0.75-1.15%, Nb 5.00-5.50%, B ≤0.006%, Mg ≤0.01%, Mn ≤0.35%, Si ≤0.35%, P ≤0.015%, S ≤0.015%, Cu ≤0.30%, Ca ≤0.01%, with the balance being Fe.

[0107] like Figure 1 As shown, the disc-shaped forging 100 of the present invention is formed by connecting a hub 101, a spoke 102, a rim 103 and a blade 104 in sequence from the center hole to the outer edge. The rim 103 is formed by an upper drum 103a and a lower drum 103b.

[0108] Figure 1 middle:

[0109] D1 is the outer diameter of the disc-shaped forging 100;

[0110] D2 is the outer diameter of the lower drum 103b of the rim 103;

[0111] D3 is the inner diameter of the lower drum 103b of the rim 103;

[0112] D4 is the outer diameter of hub 101;

[0113] D5 is the diameter of the center hole of the disc forging 100, and also the inner diameter of the hub 101;

[0114] D6 is the inner diameter of the drum 103a on the rim 103;

[0115] D7 is the outer diameter of the drum 103a on the rim 103;

[0116] H is the overall thickness of the disc forging 100 from the top end face to the bottom end face;

[0117] H1 is the thickness of the outer edge of the upper drum 103a;

[0118] H2 is the thickness of the blade, which is 104.

[0119] H3 is the thickness of the outer edge of the lower drum 103b;

[0120] H4 is the thickness of wheel hub 101;

[0121] H5 is the thickness of the spoke 102.

[0122] Step 1: 3D printing to create the original disk blank.

[0123] GH4169 alloy powder, for example, powder with a particle size of 100-300 mesh, is 3D printed into... Figure 2 The original disc blank 200 shown is composed of hub spoke blanks 201-2 and rim blanks 203 connected sequentially from the center hole to the outer edge; the rim blank 203 is composed of an upper drum blank 203a and a lower drum blank 203b. After the original disc blank 200 is made, it undergoes stress-relief annealing, which involves heating the original disc blank 200 to 850°C, holding it at that temperature for 24 hours, and then air-cooling it.

[0124] Figure 2 middle:

[0125] d1 is the outer diameter of the original blank 200;

[0126] d2 is the outer diameter of the lower drum blank 203b of the rim blank 203;

[0127] d3 is the inner diameter of the lower drum blank 203b of the rim blank 203;

[0128] d5 is the diameter of the center hole of the original 200mm blank;

[0129] d6 is the inner diameter of the upper drum cylinder blank 203a of the rim blank 203;

[0130] d7 is the outer diameter of the upper drum cylinder blank 203a of the rim blank 203;

[0131] h is the total thickness of the original blank 200 from the top end face to the bottom end face;

[0132] h1 is the thickness of the outer edge of the upper drum blank 203a;

[0133] h3 is the thickness of the outer edge of the lower drum blank 203b;

[0134] h4 is the thickness of the hub spoke blank 201-2;

[0135] α1 is the downward inclination angle of the outer edge of the rim blank 203;

[0136] α2 is the upward inclination angle of the outer edge of the rim blank 203.

[0137] Step 2: Isothermal forging of intermediate billets.

[0138] like Figure 3As shown, an intermediate blank mold 300 for a disc-shaped forging 100 is first provided. The intermediate blank mold 300 mainly consists of an upper blank mold 310 and a lower blank mold 320. After the upper blank mold 310 and the lower blank mold 320 are closed, an intermediate blank cavity 330 is formed. The upper blank mold 310 consists of an upper blank mold core block 312 and an upper blank mold sleeve block 311 fitted around the outer edge of the upper blank mold core block 312. The lower blank mold 320 mainly consists of a lower blank mold core block 322 and a lower blank mold sleeve block 321 fitted around the outer edge of the lower blank mold core block 322. A lower blank mold top block 323 is installed in the central hole of the lower blank mold core block 322. After the upper blank mold 310 and the lower blank mold 320 are closed, the top surface of the lower blank mold top block 323 contacts the bottom surface of the upper blank mold core block 312.

[0139] like Figure 4 As shown, under an inert gas protective atmosphere, such as in a sealed forging chamber with an argon protective atmosphere at a pressure of 0.04 MPa to 0.05 MPa (not shown in the attached figures, the forging chamber is equipped with a forging press, a heating furnace, an automatic lubricant spraying device, and an automatic control robot for clamping, transferring, and loading / unloading billets), the original blank 200 and the open intermediate blank mold 300 are first preheated to a surface temperature of 150℃±5℃. A lubricant, such as glass lubricant, is then uniformly sprayed onto the surfaces of the original blank 200 and the intermediate blank cavity 330. Then, the original blank 200 and the intermediate blank... The molds 300 are all heated to 1020℃±5℃. The original blank 200 is put into the intermediate blank mold 300 so that the original blank 200 is located in the intermediate blank cavity 330. The upper concave surface of the original blank 200 is tightly fitted with the bottom corner surface of the upper blank mold core block 312, and the lower concave surface of the original blank 200 is tightly fitted with the top corner surface of the lower blank mold core block 322. It is firmly pressed on the lower blank mold core block 322 by the upper blank mold core block 312 to complete the molding and positioning of the original blank 200 in the intermediate blank mold 300.

[0140] Under an inert gas protective atmosphere, the forging press is started to close the upper die 310 and the lower die 320. The forging press applies a pressure of 30MN to 50MN to the original blank 200 through the intermediate blank die 300, causing the original blank 200 to be uniformly and slowly deformed by 50% in the intermediate blank cavity 330 at a pressing speed of 0.1 mm / s to 0.2 mm / s, thus becoming as shown. Figure 5The intermediate blank 400 is shown. From the center hole to the outer edge, the intermediate blank 400 is formed by sequentially connecting a hub 401 (same as the hub 101 of the disc forging 100), a spoke 402 (same as the spoke 102 of the disc forging 100), a rim pre-forging blank 403, and a blade pre-forging blank 404. The rim pre-forging blank 403 is integrally formed by an upper drum pre-forging blank 403a and a lower drum pre-forging blank 403b. The thickness of the rim pre-forging blank 403 is the same as the thickness of the rim 103 of the disc forging 100. The inner and outer diameters of the upper drum pre-forging blank 403a are the same as the inner and outer diameters of the upper drum 103a of the disc forging 100, respectively. The inner and outer diameters of the lower drum pre-forging blank 403b are the same as the inner and outer diameters of the lower drum 103b of the disc forging 100, respectively.

[0141] During the heating and forging process of the original blank 200, the original blank 200 was heated to 1020℃±5℃ for forging. The forging temperature was set slightly higher, which is conducive to the overall and full recrystallization of the original blank 200 and reduces the difficulty of filling. A uniform and slow pressing deformation was carried out at a pressing speed of 0.1 mm / s to 0.2 mm / s to fully complete the dynamic recrystallization. After the original blank 200 was deformed into the intermediate blank 400, the grain size of the intermediate blank 400 reached grade 7 to 9. Due to the relatively large grain size of the intermediate blank 400, its high-temperature endurance and creep performance are better.

[0142] Figure 5 middle:

[0143] D01 is the outer diameter of the intermediate billet 400;

[0144] D02 is the outer diameter of the lower drum pre-forged billet 403b of the rim pre-forged billet 403;

[0145] D03 is the inner diameter of the lower drum pre-forged blank 403b of the rim pre-forged blank 403;

[0146] D04 is the outer diameter of hub 401;

[0147] D05 is the diameter of the center hole of the intermediate blank 400, and also the inner diameter of the hub 401;

[0148] D06 is the inner diameter of the upper drum pre-forged blank 403a of the rim pre-forged blank 403;

[0149] D07 is the outer diameter of the upper drum cylinder pre-forged blank 403a of the rim pre-forged blank 403;

[0150] H0 is the overall thickness of the intermediate billet 400 from the top end face to the bottom end face;

[0151] H01 is the thickness of the outer edge of the pre-forged billet 403a for the upper drum cylinder;

[0152] H02 is the thickness of the 404 pre-forged blade blank;

[0153] H03 is the thickness of the outer edge of the 403b pre-forged billet for the lower drum.

[0154] H04 is the thickness of the 401 wheel hub;

[0155] H05 is the thickness of the 402 spoke plate.

[0156] Step 3: Isothermal forging of dual-performance disc forgings.

[0157] like Figure 6 As shown, a disc forging die 500 is first provided. The disc forging die 500 mainly consists of an upper forging die 510 and a lower forging die 520. After the upper forging die 510 and the lower forging die 520 are closed, a disc forging cavity 530 is formed. The upper forging die 510 consists of an upper forging die core block 512 (and... Figure 3 The intermediate billet mold 300 consists of the upper billet core block 312 (which is the same as the upper forging die core block 312) and the upper forging die sleeve block 511 that fits around the outer edge of the upper forging die core block 512; the lower forging die 520 mainly consists of the lower forging die core block 522 (which is the same as the lower forging die core block 522). Figure 3 The lower forging die core block 322 of the intermediate billet mold 300 is the same as that of the lower forging die core block 322, and the lower forging die sleeve block 521 is fitted around the outer edge of the lower forging die core block 522. A lower forging die top block 523 (similar to the lower forging die core block 522) is installed in the central hole of the lower forging die core block 522. Figure 3 (The lower blank die top block 323 of the intermediate blank die 300 is the same). After the upper forging die 510 and the lower forging die 520 are closed, the top surface of the lower forging die top block 523 contacts the bottom surface of the upper forging die core block 512.

[0158] from Figure 6 The disc forging die 500 shown and Figure 3 As can be seen from the intermediate billet mold 300 shown, the difference between the disc forging mold 500 and the intermediate billet mold 300 lies in the fact that... Figure 3 The upper blank mold sleeve 311 and lower blank mold sleeve 321 in the middle were replaced with Figure 6 The upper forging die sleeve 511 and the lower forging die sleeve 521; while Figure 6 The upper forging die core block 512, lower forging die core block 522, and lower forging die top block 523 are related to... Figure 3 The corresponding modules are the same and have not been replaced.

[0159] like Figure 7 As shown, the intermediate blank 400 is first wrapped with a heat insulation layer, such as an aluminum silicate fiber heat insulation layer 600, from the hub 401, the spoke 402 to the rim pre-forged blank 403, with the upper and lower end faces. Only the blade pre-forged blank 404 is exposed.

[0160] Under an inert gas protective atmosphere, such as in a sealed forging chamber with an argon protective atmosphere at a pressure of 0.04 MPa to 0.05 MPa (not shown in the attached drawings, the forging chamber is equipped with a forging press, a heating furnace, an automatic lubricant spraying device, and an automatic control robot for clamping, transferring, and loading / unloading billets), the blade pre-forging billet 404 of the intermediate billet 400 and the open disc forging mold 500 are first preheated to a surface temperature of 150℃±5℃. The upper and lower end faces and outer edge faces of the blade pre-forging billet 404 of the intermediate billet 400, as well as the surface of the disc forging cavity 530, are then uniformly sprayed with... Apply a lubricant, such as glass lubricant; then heat the blade pre-forging billet 404 of the intermediate billet 400 and the disc forging die 500 to 995℃±5℃. Since the intermediate billet 400 is wrapped with aluminum silicate fiber insulation layer 600 except for the blade pre-forging billet 404, only the blade pre-forging billet 404 of the intermediate billet 400 reaches 995℃±5℃, while the other wrapped parts do not reach the forging temperature. Then remove the aluminum silicate fiber insulation layer 600 that wraps the intermediate billet 400.

[0161] like Figure 8 As shown, the intermediate billet 400 is loaded into the disc forging mold 500 so that the intermediate billet 400 is located in the disc forging cavity 530. The center hole of the intermediate billet 400 is fitted into the top circular module of the lower forging die top block 523. The bottom module of the upper forging die sleeve block 511 presses against the upper end face of the blade pre-forging billet 404 of the intermediate billet 400. The middle module of the lower forging die sleeve block 521 presses against the lower end face of the blade pre-forging billet 404 of the intermediate billet 400, thus completing the loading and positioning of the intermediate billet 400 in the disc forging mold 500.

[0162] The forging press is started to close the upper forging die 510 and the lower forging die 520. The forging press applies a pressure of 30MN to 50MN to the blade pre-forging blank 404 of the intermediate billet 400 through the bottom module of the upper forging die sleeve 511 and the middle module of the lower forging die sleeve 521 of the disc forging die 500. This causes the blade pre-forging blank 404 of the intermediate billet 400 to be uniformly and rapidly deformed by 55% within the disc forging cavity 530 at a pressing speed of 1 mm / s to 1.5 mm / s, thus becoming the blade pre-forging blank 404. Figure 1 The blades 104 of the disc forging 100 shown complete the final forging of the disc forging 100.

[0163] During the heating and forging process of the blade pre-forging billet 404 of the intermediate billet 400, the blade pre-forging billet 404 of the intermediate billet 400 was heated to 995℃±5℃ for forging. The forging temperature setting was slightly lower, which is beneficial for obtaining finer grains in the blade 104 part of the disc forging 100. The uniform and rapid pressing deformation was carried out at a pressing speed of 1 mm / s to 1.5 mm / s. The increased deformation rate increased the grain nucleation rate, which is beneficial for obtaining fine grains. After the intermediate billet 400 was deformed into the disc forging 100, the grain size of the blade 104 part of the disc forging 100 reached grade 11 to 12. Due to the fine grain size of the blade 104 part, the high-cycle fatigue performance and vibration resistance are better.

[0164] Since the upper and lower end faces of the intermediate billet 400 from the hub 401, the spokes 402 to the rim pre-forged billet 403 are wrapped with aluminum silicate fiber insulation layer 600, they do not reach the forging temperature during heating and are not deformed during the forging process. Furthermore, the upper and lower end faces of the hub 101, the spokes 102 and the rim 103 of the disc forging 100 have already been formed when the intermediate billet 400 is forged. Therefore, the grain size of the hub 101, the spokes 102 and the rim 103 of the disc forging 100 is the same as the grain size of the hub 401, the spokes 402 and the rim pre-forged billet 403 of the intermediate billet 400, which is the 7-9 grade grain size in step two.

[0165] In summary, the hub 101, spokes 102, and rim 103 of the disc forging 100 have good high-temperature creep resistance and other properties, while the blade 104 of the disc forging 100 has good high-cycle fatigue resistance and vibration resistance. Therefore, the method described in this invention forges a nickel-based high-temperature alloy dual-performance disc forging.

[0166] exist Figure 1 The disc-shaped forging 100 shown Figure 2 The original blank 200 and shown Figure 5 In the dimensional relationships of the intermediate blank 400 shown:

[0167] ① d3=D03=D3; d6=D06=D6; D02=D2; D04=D4; D05=D5; D07=D7; H04=H4; H05=H5; H0=H.

[0168] This design ensures that the inner ring surface of the lower drum blank 203b of the rim blank 203 in the original disc blank 200 has the same slope as the inner ring surface of the lower drum 103b of the rim 103 in the disc forging 100; the inner ring surface of the upper drum blank 203a of the rim blank 203 has the same slope as the inner ring surface of the upper drum 103a of the rim 103; during forging, the upper concave surface of the original disc blank 200 fits tightly with the bottom corner surface of the upper die core block 312, and the lower concave surface of the original disc blank 200 fits tightly with the bottom corner surface of the lower die core block 322. The corner surfaces fit together tightly; in this way, during the forging process of the original blank 200 into the intermediate blank 400, the module action first presses the blank material from the direction of the spoke 402 of the intermediate blank 400, causing the metal of the blank to flow from the position of the spoke 402 to the direction of the hub 401 and the rim pre-forged blank 403 of the intermediate blank 400 respectively. This type of material-separated forging is beneficial to the forging of the hub 401, spoke 402 and rim pre-forged blank 403 of the intermediate blank 400 and to obtaining a uniform structure. Since the hub 401 of the intermediate billet 400 is the same as the hub 101 of the disc forging 100, and the spokes 402 of the intermediate billet 400 are the same as the spokes 102 of the disc forging 100, and the inner and outer diameters and thicknesses of the pre-forged rim billet 403 of the intermediate billet 400 are the same as the inner and outer diameters and thicknesses of the rim 103 of the disc forging 100, the forging of the disc forging 100 begins with the upper and lower inner disc surfaces and the upper and lower end surfaces of the rim 103, laying the foundation for the subsequent separate forging of the blade pre-forging billet 404 of the intermediate billet 400 into the blade 104 of the disc forging 100.

[0169] ② h4×2÷(H04+H05)≥λ1; h÷H0≥λ2; D1÷d1≥λ3; d5÷D05≥λ4.

[0170] In the formula: H04=H4, H05=H5, H0=H, D05=D5; λ1, λ2, λ3, λ4 are deformation coefficients, and the values ​​of these coefficients in this invention are: λ1=2.4, λ2=1.33, λ3=1.2, λ4=2.

[0171] This design ensures that the original billet 200 can balance the deformation amount in both the thickness and diameter directions during deformation. This avoids the situation where the original billet 200 is too thick during the forging process into the intermediate billet 400, resulting in excessive deformation in the thickness direction and insufficient pressing. At the same time, it also avoids the situation where the thickness is too small, resulting in insufficient deformation in the thickness direction and inability to fully refine the grains, thus ensuring the balance of billet deformation.

[0172] ③ d2÷D05=K(D01÷d1).

[0173] In the formula: D05=D5; K is the filling rate coefficient, which is 1.85 in this invention.

[0174] This design ensures that during the process of the original blank 200 being deformed into the intermediate blank 400, the hub 401, spokes 402, and rim pre-forged blank 403 of the intermediate blank 400 can simultaneously fill the cavity, thereby overcoming the situation where the rim pre-forged blank 403 is filled last due to its slower filling rate compared to the hub 401 and spokes 402, thus ensuring the safety of the blank filling process.

[0175]

[0176] In the formula: w1 and w2 are instability coefficients, and the values ​​in this invention are w1=4 and w2=3;

[0177] This design limits the downward tilt angle α1 and upward tilt angle α2 of the outer edge of the flange blank 203 to less than or equal to 15° (anti-folding slope), so that the original disc blank 200 avoids instability or folding during the deformation into the intermediate blank 400, and ensures the stability of the blank filling.

[0178] ⑤ H02÷H2≥λ5

[0179] λ5 is the deformation coefficient, and in this invention, λ5 = 2.2.

[0180] This design allows for a larger deformation amount when the blade pre-forging billet 404 of the intermediate billet 400 is deformed into the blade 104 of the disc forging 100, thereby refining the grains.

[0181] Step 4: Post-forging heat treatment

[0182] After forging, the disc forging 100 is subjected to heat treatment, namely solution treatment and aging treatment. The solution treatment involves heating the disc forging 100 to 980℃±5℃, holding it at that temperature for 3 hours, and then air cooling it. The aging treatment involves heating the solution-treated disc forging 100 to 720±5℃, holding it at that temperature for 8.5 hours, then furnace cooling it to 620℃ at a rate of 50℃ / h, holding it at that temperature for 8 hours, and then air cooling it.

Claims

1. An isothermal forging method for 3D-printed blanks of nickel-based superalloy dual-performance disc forgings, characterized in that, Includes the following steps: Nickel-based high-temperature alloy powder is 3D printed to form a blank, which is then subjected to stress-relief annealing. The blank is formed by connecting hub spoke blanks and rim blanks from the center hole to the outer edge. The rim blank is composed of an upper drum blank and a lower drum blank. An intermediate billet mold for disc forgings is provided. The intermediate billet mold mainly consists of an upper billet mold and a lower billet mold. After the upper billet mold and the lower billet mold are closed, an intermediate billet cavity is formed. The upper billet mold consists of an upper billet mold core block and an upper billet mold sleeve block fitted around the outer edge of the upper billet mold core block. The lower billet mold mainly consists of a lower billet mold core block and a lower billet mold sleeve block fitted around the outer edge of the lower billet mold core block. A lower billet mold top block is installed in the central hole of the lower billet mold core block. After the upper billet mold and the lower billet mold are closed, the top surface of the lower billet mold top block contacts the bottom surface of the upper billet mold core block. Under an inert gas protective atmosphere, the original blank and the opened intermediate blank mold are first preheated to a surface temperature of 150℃±5℃. Lubricant is then evenly sprayed onto the surfaces of the original blank and the intermediate blank cavity. The original blank and the intermediate blank mold are then heated to 1020℃±5℃. The original blank is then loaded into the intermediate blank mold so that it is located inside the intermediate blank cavity. The upper concave surface of the original blank is tightly fitted with the bottom corner surface of the upper blank mold core block, and the lower concave surface of the original blank is tightly fitted with the top corner surface of the lower blank mold core block. The original blank is firmly pressed onto the lower blank mold core block by the upper blank mold core block, thus completing the loading and positioning of the original blank in the intermediate blank mold. Start the forging press to close the upper and lower dies. The forging press applies a pressure of 30MN to 50MN to the original blank through the intermediate blank die, causing the original blank to move at a speed of 0.1 within the intermediate blank cavity. After being pressed at a uniform and slow speed of 0.2 mm / s to 0.2 mm / s for 50% deformation, it becomes an intermediate billet. The intermediate billet is formed by connecting the hub, spokes, rim pre-forged billet and blade pre-forged billet in sequence from the center hole to the outer edge. The rim pre-forged billet is composed of an upper drum pre-forged billet and a lower drum pre-forged billet. The hub and spokes of the intermediate billet are the same as those of the disc forging. The thickness of the rim pre-forged billet of the intermediate billet is the same as that of the rim of the disc forging. The inner and outer diameters of the upper drum pre-forged billet of the intermediate billet are the same as those of the upper drum of the disc forging. The inner and outer diameters of the lower drum pre-forged billet of the intermediate billet are the same as those of the lower drum of the disc forging. A disc-shaped forging die is provided, which mainly consists of an upper forging die and a lower forging die. After the upper and lower forging dies are closed, a disc-shaped forging cavity is formed. The upper forging die consists of an upper forging die core block and an upper forging die sleeve block fitted around the outer edge of the upper forging die core block. The lower forging die mainly consists of a lower forging die core block and a lower forging die sleeve block fitted around the outer edge of the lower forging die core block. A lower forging die top block is installed in the central hole of the lower forging die core block. After the upper and lower forging dies are closed, the top surface of the lower forging die top block contacts the bottom surface of the upper forging die core block. The upper and lower end faces of the intermediate billet from the hub and spokes to the rim pre-forged billet are wrapped with a heat insulation layer, leaving only the blade pre-forged billet exposed. Under an inert gas protective atmosphere, the blade pre-forging blank of the intermediate billet and the open disc forging mold are first preheated to a surface temperature of 150℃±5℃. Lubricant is then evenly sprayed onto the upper and lower end faces and outer edge faces of the blade pre-forging blank of the intermediate billet and the surface of the disc forging cavity. The blade pre-forging blank of the intermediate billet and the disc forging mold are then heated to 995℃±5℃. After that, the heat insulation layer covering the intermediate billet is removed. The intermediate billet is loaded into the disc forging mold so that it is located in the cavity of the disc forging mold. The center hole of the intermediate billet is fitted into the top circular module of the lower forging mold top block. The bottom module of the upper forging mold sleeve block presses against the upper end face of the blade pre-forging billet of the intermediate billet. The middle module of the lower forging mold sleeve block presses against the lower end face of the blade pre-forging billet of the intermediate billet, thus completing the loading and positioning of the intermediate billet in the disc forging mold. Start the forging press to close the upper and lower forging dies. The forging press applies a pressure of 30MN to 50MN to the blade pre-forging blank of the intermediate billet through the bottom module of the upper forging die sleeve and the middle module of the lower forging die sleeve of the disc forging die. This causes the blade pre-forging blank of the intermediate billet to be uniformly and rapidly pressed and deformed by 55% at a pressing speed of 1 mm / s to 1.5 mm / s in the cavity of the disc forging die, thus becoming the blade of the disc forging and completing the final forging of the disc forging.

2. The isothermal forging method for 3D-printed blanks of nickel-based superalloy dual-performance disc forgings as described in claim 1, characterized in that, The material grade of the nickel-based superalloy is GH4169.

3. The isothermal forging method for 3D-printed blanks of nickel-based superalloy dual-performance disc forgings as described in claim 1, characterized in that, The particle size of the nickel-based superalloy powder is 100 mesh to 300 mesh.

4. The isothermal forging method for 3D-printed blanks of nickel-based superalloy dual-performance disc forgings as described in claim 1, characterized in that, The stress-relief annealing of the original billet involves heating the original billet to 850°C, holding it at that temperature for 24 hours, and then air-cooling it.

5. The isothermal forging method for 3D-printed blanks of nickel-based superalloy dual-performance disc forgings as described in claim 1, characterized in that, The inert gas protective atmosphere refers to argon gas with a pressure of 0.04 MPa to 0.05 MPa filling the sealed forging chamber as a protective atmosphere.

6. The isothermal forging method for 3D-printed blanks of nickel-based superalloy dual-performance disc forgings as described in claim 1, characterized in that, The lubricant used for spraying is a glass lubricant.

7. The isothermal forging method for 3D-printed blanks of nickel-based superalloy dual-performance disc forgings as described in claim 1, characterized in that, The insulation layer that encloses the intermediate blank is an aluminum silicate fiber insulation layer.

8. The isothermal forging method for 3D-printed blanks of nickel-based superalloy dual-performance disc forgings as described in any one of claims 1 to 7, characterized in that, The dimensional relationships between the disc forging, the original disc billet, and the intermediate billet are as follows: ① d3=D03=D3; d6=D06=D6; D02=D2; D04=D4; D05=D5; D07=D7; H04=H4; H05=H5; H0=H; In the formula: d3 is the inner diameter of the lower drum blank of the original disc blank rim blank; D03 is the inner diameter of the lower drum pre-forged billet of the intermediate billet rim pre-forged billet; D3 is the inner diameter of the lower drum of the disc forging rim; d6 is the inner diameter of the upper drum cylinder blank of the original disc blank rim blank; D06 is the inner diameter of the upper drum cylinder pre-forged billet of the intermediate billet rim pre-forged billet; D6 is the inner diameter of the upper drum of the disc forging rim; D02 is the outer diameter of the lower drum pre-forged billet of the intermediate billet rim pre-forged billet; D2 is the outer diameter of the lower drum of the disc forging rim; D04 is the outer diameter of the intermediate blank hub; D4 is the outer diameter of the disc-shaped forged wheel hub; D05 is the diameter of the center hole in the intermediate billet; D5 is the diameter of the center hole in the disc-shaped forging; D07 is the outer diameter of the upper drum cylinder pre-forged billet of the intermediate billet rim pre-forged billet; D7 is the outer diameter of the upper drum of the disc forging rim; H04 is the thickness of the intermediate blank hub; H4 is the thickness of the disc-shaped forged wheel hub; H05 is the thickness of the intermediate billet spokes; H5 is the thickness of the spokes of the disc forging; H0 is the overall thickness of the intermediate billet from the top end face to the bottom end face; H is the overall thickness of the disc-shaped forging from the top end face to the bottom end face; ② h4×2÷(H04+H05)≥λ1;h÷H0≥λ2;D1÷d1≥λ3;d5÷D05≥λ4;and H04=H4、H05=H5、H0=H、D05=D5; In the formula: λ1, λ2, λ3, and λ4 are deformation coefficients with the following values: λ1 = 2.4, λ2 = 1.33, λ3 = 1.2, and λ4 = 2. h4 is the thickness of the hub spoke plate blank of the original disc blank; H04 is the thickness of the intermediate blank hub; H4 is the thickness of the disc-shaped forged wheel hub; H05 is the thickness of the intermediate billet spokes; H5 is the thickness of the spokes of the disc forging; h is the total thickness of the original blank from the top end face to the bottom end face; H0 is the overall thickness of the intermediate billet from the top end face to the bottom end face; H is the overall thickness of the disc-shaped forging from the top end face to the bottom end face; D1 is the outer diameter of the disc-shaped forging; d1 is the outer diameter of the original blank; d5 is the diameter of the center hole of the original blank; D05 is the diameter of the center hole in the intermediate billet; D5 is the diameter of the center hole in the disc-shaped forging; ③ d2÷D05=K(D01÷d1;and D05=D5; In the formula: K is the filling rate coefficient, with a value of 1.85; d2 is the outer diameter of the lower drum blank of the original disc blank rim blank; D05 is the diameter of the center hole in the intermediate billet; D5 is the diameter of the center hole in the disc-shaped forging; D01 is the outer diameter of the intermediate billet; d1 is the outer diameter of the original blank; In the formula: w1 and w2 are instability coefficients, with values ​​of w1=4 and w2=3. α1 is the downward inclination angle of the outer edge of the original disc blank; α2 is the upward inclination angle of the outer edge of the original disc blank; h is the total thickness of the original blank from the top end face to the bottom end face; h1 is the thickness of the outer edge of the upper drum blank of the original disc blank; h3 is the thickness of the outer edge of the lower drum blank of the original disc blank; d2 is the outer diameter of the lower drum blank of the original disc blank rim blank; d3 is the inner diameter of the lower drum blank of the original disc blank rim blank; d6 is the inner diameter of the upper drum cylinder blank of the original disc blank rim blank; d7 is the outer diameter of the upper drum cylinder blank of the original disc blank rim blank; ⑤ H02÷H2≥λ5; In the formula: λ5 is the deformation coefficient, and its value is: λ5 = 2.2; H02 is the thickness of the blade pre-forging billet in the intermediate billet; H2 is the thickness of the disc-shaped forging blade.

9. The isothermal forging method for 3D-printed blanks of nickel-based superalloy dual-performance disc forgings as described in claim 1, characterized in that, After forging, the disc-shaped forging is subjected to solution treatment and aging treatment.

10. The isothermal forging method for 3D-printed blanks of nickel-based superalloy dual-performance disc forgings as described in claim 9, characterized in that, The solution treatment involves heating the disc forging to 980℃±5℃, holding it at that temperature for 3 hours, and then air cooling it. The aging treatment involves heating the solution-treated disc forging to 720±5℃, holding it at that temperature for 8.5 hours, then furnace cooling it to 620℃ at a rate of 50℃ / h, holding it at that temperature for 8 hours, and then air cooling it.

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