A method of additive manufacturing of a nickel-based cast high-temperature alloy vane

Abstract

The application provides a forming method of additive manufacturing of a nickel-based cast high-temperature alloy blade, which is optimized and adjusted from three aspects of alloy composition, laser forming process parameters and heat treatment process, laser selective melting forming technology is used to manufacture a vane blade part, compared with a traditional casting process, the forming of the blade component is realized in an integrated and rapid manner, the cracking and scrapping problem caused by thermal cracks in the part manufacturing process is effectively solved, the production efficiency and the qualified rate are greatly improved, and the product qualified rate is increased from about 40% of the casting to more than 90%.

Description

Technical Field

[0001] This application belongs to the field of additive manufacturing technology, and in particular relates to an additive manufacturing method for nickel-based cast high-temperature alloy blades. Background Technology

[0002] With increasing demands for low-cost and rapid manufacturing, additive manufacturing technology is being applied more and more widely in the field of aero-engines. Hot-end components such as turbine casings, exhaust casings, and guide vanes are typically manufactured using cast high-temperature alloys such as K447A, K416B, and K423. These materials can operate stably for extended periods above 600°C, exhibiting excellent high-temperature performance, oxidation resistance, and corrosion resistance. However, because cast high-temperature alloys generally have poor weldability, they are prone to welding hot cracking, leading to component failure. Therefore, integral casting or vacuum brazing processes are typically used. These traditional processes suffer from high tooling investment and low yield rates, resulting in long manufacturing cycles and low production efficiency. For example, a guide vane made of K447A had a yield rate of only about 40% using traditional casting processes, and internal defects such as microcracks, porosity, and slag inclusions frequently resulted in component failure.

[0003] Additive manufacturing (laser selective melting) utilizes a layer-by-layer powder deposition method, laser sintering and stacking layers sequentially. It offers advantages such as no molds, short cycle times, and excellent metallurgical quality. However, in the laser selective melting process, each tiny molten pool undergoes rapid melting and solidification, equivalent to countless welding processes. Using traditional alloy material compositions can easily lead to hot cracking. Therefore, it is necessary to optimize existing casting high-temperature alloy forming and additive manufacturing processes, improving the process applicability of additive manufacturing. This involves effectively controlling the tendency for hot cracking while ensuring good metallurgical structure and high-temperature performance. Integrated printing manufacturing through additive manufacturing can improve product yield and shorten production cycles. Summary of the Invention

[0004] The purpose of this invention is to provide a laser selective melting forming method for guide vane components and a crack control technology, so as to achieve rapid overall forming of cast high-temperature alloy vanes, while effectively controlling and improving the problems of hot cracking and cracking during the forming process.

[0005] This application provides an additive manufacturing method for nickel-based cast superalloy blades, the method comprising:

[0006] S1: Material preparation: Take 200Kg of casting high-temperature alloy powder from the vacuum-packed sealed container for later use; S2: Powder drying: Dry the powder material described in S1 in a vacuum explosion-proof drying oven; S3: Support Design: Import the 3D model of the guide vane into the support design software for laser selective melting forming, adjust the placement and posture, and add supports on the hanging surface where forming is dangerous to ensure the part is printed. S4: Additive manufacturing forming: The metal powder in S2 is loaded into the laser selective melting forming equipment, and the model after adding support design as described in S3 is transferred to the equipment. Reasonable forming process parameters are set to print the part and support layer by layer to obtain the guide vane part with support excess. The formed part is sintered and connected to the substrate. S5: Solution aging treatment: The blade parts in S4, together with the forming substrate, undergo solution aging heat treatment to achieve control of microstructure and properties. S6: Wire EDM: The parts and substrate in S5 are cut and separated using a dedicated wire EDM machine; S7: Remove support: Remove the excess support of the blade parts separated in S5 by machining or fitter to obtain the hollow blade parts of the guide. Polish the blade surface by fitter and then sandblast. S8: Flaw Detection Inspection: The blade parts in S7 are inspected using X-ray and fluorescence inspection methods to check the internal and external quality of the blades. The internal parts are required to be free of pores, inclusions and microcracks; the external surfaces are required to be free of pores and linear defects.

[0007] Preferably, in S1, the chemical composition of the cast high-temperature alloy powder is optimized to reduce the content of Al and Ti elements and reduce the content of the low-melting-point eutectic phase γ', i.e., Ni3 (AlTi), thereby reducing the tendency for hot cracking. The specific composition (wt.%) is as follows: Cr: 15.7%–16.3%, Co: 8.0%–9.0%, W: 2.4%–2.8%, Mo: 2.0%–2.5%, Ti: 2.5%–3.0%, Al: 2.6%–3.1%, Nb: 1.2%–1.7%, Ta: 1.5%–2.0%, Zr: 0.05%–0.15%, Fe≤0.5%, Si≤0.3%, C≤0.15%, Ni balance.

[0008] Preferably, in step S2, the drying process is carried out at 80℃~100℃ for 1h~2h, and the vacuum degree of the oven is (0.5~1.0)×10. -3 Pa.

[0009] Preferably, in S3, the blade is placed at a 90° angle perpendicular to the substrate, the support type for the overhang is a grid support, and the substrate material is GH4169.

[0010] Preferably, in S4, the laser selective melting forming process parameters are: (1) the laser power of the part body = 260W~340W, the scanning speed = 700mm / s~1100mm / s, the overlap distance = 0.08mm~0.16mm, and the powder layer thickness is 30μm~40μm; (2) the support power = 200W~380W, the support scanning speed = 1500mm / s~2500mm / s, the powder layer thickness is 30μm~40μm, and the substrate heating temperature is 80℃~200℃.

[0011] Preferably, in S5, the solution aging process is vacuum heat treatment. The solution treatment involves heating to 1000℃~1200℃ at a rate of 8℃~15℃ / min, holding at that temperature for 1h~5h, cooling in the furnace to 300℃, purging with argon gas, and cooling to 80℃~100℃ before exiting the furnace. Aging treatment: Heat to 600℃~900℃ at a rate of 8℃~15℃ / min and hold for 20h~36h, then cool in the furnace to 80℃~100℃ before unloading. Preferably, in S6, the wire cutting equipment is a medium-speed wire cutting equipment; In S7, excess mesh supports are removed manually using a fitter's method, and the outer surface of the blade is ground and polished with a pneumatic milling cutter or a small grinding wheel to remove powder particles adhering to the surface. After polishing, the surface of the part is sandblasted with 80# to 120# white corundum sand at a pressure of 0.2MPa to 0.6MPa, taking care to prevent contamination of the blade's inner cavity.

[0012] Preferably, in S8, the X-ray flaw detection method is performed according to HB / Z 20160, and the fluorescence inspection method is performed according to HB / Z 61; the casting high-temperature alloy powder material used for additive manufacturing is K438 alloy; the envelope length × width × height of the guide hollow blade is 30mm × 4mm × 22mm.

[0013] The beneficial technical effects of this application are as follows: This invention optimizes and adjusts the alloy composition, laser forming process parameters, and heat treatment process, and uses laser selective melting forming technology to manufacture guide vane parts. Compared with traditional casting processes, it achieves integrated and rapid manufacturing of vane components, effectively solving the problem of cracking and scrapping caused by thermal cracking during the parts manufacturing process. Production efficiency and yield are greatly improved, with the product yield increasing from about 40% in casting to over 90%.

[0014] This invention innovatively optimizes the alloy composition system by reducing the content of Al and Ti elements to decrease the precipitation of low-melting-point eutectic phases, thereby effectively controlling the tendency to crack due to hot cracking. Simultaneously, it appropriately increases the content of Mo and Nb elements to maintain the alloy's high-temperature mechanical properties. By optimizing the laser sintering process parameters of the solid and support parts, alloy specimens with a density of over 99.4% and free from defects such as microcracks are obtained. Through exploring the solution-aging heat treatment regime, precipitation strengthening of the K438 alloy is achieved, resulting in good room-temperature and high-temperature mechanical properties, and achieving the performance indicators of cast K438 high-temperature alloys. The K438 alloy of this invention exhibits good laser additive manufacturing processability, low hot cracking tendency, high density, and good mechanical properties, possessing the technical capability to replace cast K438 high-temperature alloys. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a flowchart of the laser selective melting forming process for blade parts in an embodiment. Figure 2 This is a schematic diagram of the arrangement of blades formed by laser additive manufacturing in an embodiment. Figure 3 This is a low-magnification microstructure photograph of K438 alloy formed by laser selective melting; Figure 4 This is an actual K438 guide vane formed by selective laser melting. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0019] In the description of this invention, it should be noted that the directions or positional relationships indicated by terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing and simplifying the invention, and should not be construed as limiting the invention. Furthermore, the use of ordinal numbers (e.g., "first and second," etc.) is for distinguishing objects and is not limited to this order, and should not be construed as indicating or implying relative importance.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly, encompassing both direct connection and indirect connection via an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0021] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] The present invention will be further described in detail below with reference to the embodiments and accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0023] To achieve the above objectives, an additive manufacturing method for nickel-based cast superalloy blades is provided, comprising the following steps: S1: Material preparation: Take 200Kg of casting high-temperature alloy powder from the vacuum-packed sealed container for later use.

[0024] S2: Powder drying: Dry the powder material described in S1 in a vacuum explosion-proof drying oven; S3: Support Design: Import the 3D model of the guide vane into the support design (Magics) software for laser selective melting forming. Adjust the placement and orientation (angle, direction, etc.), and add supports on the overhanging surfaces where forming is dangerous to ensure the part is printed correctly; S4: Additive Manufacturing: The metal powder described in S2 is loaded into a laser selective melting forming device. The model with added support as described in S3 is then transferred to the device, and reasonable forming process parameters are set to print the part and support layer by layer, resulting in a guide vane part with supporting excess. The formed part is then sintered and bonded to the substrate. S5: Solution aging treatment: The blade parts described in S4, together with the forming substrate, are subjected to solution aging heat treatment to achieve control of microstructure and properties. S6: Wire cutting: The parts and substrate described in S5 are cut and separated using a dedicated wire cutting device; S7: Removal of Supports: The excess support parts of the blade parts separated in S5 are removed by machining or fitter work to obtain the hollow blade parts of the guide vane. The blade surface is then polished by fitter work and sandblasted. S8: Flaw Detection Inspection: The blade components described in S7 are inspected using X-ray and fluorescence inspection methods to check the internal and external quality of the blades. The internal parts must be free of porosity, inclusions, and microcracks; the external surface must be free of porosity and linear defects.

[0025] In one possible embodiment, in step S1, the chemical composition of the cast high-temperature alloy powder is optimized to reduce the content of Al and Ti elements and decrease the content of the low-melting-point eutectic phase γ' (Ni3(AlTi)), thereby reducing the tendency for hot cracking. Specifically, the composition (wt.%) is: Cr: 15.7%–16.3%, Co: 8.0%–9.0%, W: 2.4%–2.8%, Mo: 2.0%–2.5%, Ti: 2.5%–3.0%, Al: 2.6%–3.1%, Nb: 1.2%–1.7%, Ta: 1.5%–2.0%, Zr: 0.05%–0.15%, Fe≤0.5%, Si≤0.3%, C≤0.15%, Ni balance; In one possible embodiment, in step S2, the drying process is carried out at 80℃~100℃ for 1h~2h, and the vacuum degree of the oven is (0.5~1.0)×10. -3 Pa; In one possible embodiment, in step S3, the blades are positioned at a 90° angle perpendicular to the substrate. The support type for the overhang is a mesh support, and the substrate material is GH4169. In one possible embodiment, in step S4, the laser selective melting forming process parameters are: (1) Laser power of the part body = 260W~340W, scanning speed = 700mm / s~1100mm / s, overlap distance = 0.08mm~0.16mm, powder layer thickness = 30μm~40μm; (2) Support power = 200W~380W, support scanning speed = 1500mm / s~2500mm / s, powder layer thickness = 30μm~40μm. The substrate heating temperature is 80℃~200℃; In one possible embodiment, in step S5, the solution aging process is a vacuum heat treatment. The solution treatment involves heating to 1000℃~1200℃ at a rate of 8℃~15℃ / min, holding at that temperature for 1h~5h, cooling in the furnace to 300℃, purging with argon gas, and cooling to 80℃~100℃ before exiting the furnace. Aging treatment: Heat to 600℃~900℃ at a rate of 8℃~15℃ / min and hold for 20h~36h, then cool in the furnace to 80℃~100℃ before unloading. In one possible embodiment, in step S6, the wire cutting device is a medium-speed wire cutting device; In one possible embodiment, in step S7, excess mesh support is manually removed using a fitter's method, and the outer surface of the blade is ground and polished using a pneumatic milling cutter or a small grinding wheel to remove powder particles adhering to the surface. After polishing, the surface of the part is sandblasted using 80# to 120# white corundum abrasive at a pressure of 0.2MPa to 0.6MPa. Care should be taken to prevent contamination of the blade's inner cavity. In one possible embodiment, in step S8, the X-ray flaw detection method is performed according to HB / Z 20160, and the fluorescence inspection method is performed according to HB / Z 61; In one possible embodiment, the casting high-temperature alloy powder material used for additive manufacturing is K438 alloy; In one possible embodiment, the envelope dimensions of the hollow blade of the guide are 30mm × 4mm × 22mm (length × width × height).

[0026] This invention optimizes and adjusts the alloy composition, laser forming process parameters, and heat treatment process, and uses laser selective melting forming technology to manufacture guide vane parts. Compared with traditional casting processes, it achieves integrated and rapid manufacturing of vane components, effectively solving the problem of cracking and scrapping caused by thermal cracking during the parts manufacturing process. Production efficiency and yield are greatly improved, with the product yield increasing from about 40% in casting to over 90%.

[0027] This invention innovatively optimizes the alloy composition system by reducing the content of Al and Ti elements to decrease the precipitation of low-melting-point eutectic phases, thereby effectively controlling the tendency to crack due to hot cracking. Simultaneously, it appropriately increases the content of Mo and Nb elements to maintain the alloy's high-temperature mechanical properties. By optimizing the laser sintering process parameters of the solid and support parts, alloy specimens with a density of over 99.4% and free from defects such as microcracks are obtained. Through exploring the solution-aging heat treatment regime, precipitation strengthening of the K438 alloy is achieved, resulting in good room-temperature and high-temperature mechanical properties, and achieving the performance indicators of cast K438 high-temperature alloys. The K438 alloy of this invention exhibits good laser additive manufacturing processability, low hot cracking tendency, high density, and good mechanical properties, possessing the technical capability to replace cast K438 high-temperature alloys.

[0028] To further illustrate the content of this invention in detail below, please refer to the accompanying drawings. Figure 1 -Appendix Figure 4 The present invention will be further described below.

[0029] S1: Material Preparation: Take 200 kg of casting high-temperature alloy powder from the vacuum-packed sealed container for later use. The casting high-temperature alloy material grade is K438, and its chemical composition (wt.%) is: Cr: 15.9%, Co: 8.36%, W: 2.58%, Mo: 2.23%, Ti: 2.7%, Al: 2.9%, Nb: 1.3%, Ta: 1.67%, Zr: 0.08%, Fe: 0.12%, Si: 0.11%, C: 0.11%, Ni balance; S2: Powder Drying: Take 60 kg of the powder material described in S1 and dry it in a vacuum explosion-proof drying oven. The drying process is 100℃, held for 1 hour, and the vacuum degree of the oven is 0.6×10⁻⁶. -3 Pa; S3: Support Design: Load the alloy powder described in S2 into the laser selective melting forming equipment. Import the 3D model of the guide vane into the support design (Magics) software for laser selective melting forming. Position the vane perpendicular to the substrate at a 90° angle, with the tenon facing downwards and the cavity opening facing upwards. Add a grid support to the suspended surface, such as... Figure 2 As shown. The substrate material is GH4169; S4: Additive manufacturing forming: Load the material described in S2 into the additive manufacturing equipment. Import the model after adding the support design described in S3 into the additive manufacturing equipment, and use reasonable forming process parameters to print the parts and supports layer by layer. The laser selective melting forming process parameters are: (1) Laser power of the part entity = 275W, scanning speed = 880mm / s, overlap distance = 0.14mm, powder layer thickness 40μm; (2) Support power = 220W, support scanning speed = 1800mm / s, powder layer thickness 40μm. The substrate heating temperature is 120℃; using the laser forming process parameters described in S4, the alloy metallurgical structure has good properties and the density reaches more than 99.4%, see Figure 3 .

[0030] S5: Solution Aging Treatment: The blade parts described in S4, along with the formed substrate, are subjected to solution aging to control their microstructure and properties. The solution aging process is a vacuum heat treatment. Solution treatment: Heat to 1120℃ at a rate of 10℃ / min and hold for 2 hours, then cool to 300℃ in the furnace and purge with argon gas to cool to 80℃; Aging treatment: Heat to 840℃ at a rate of 8℃ / min and hold for 24 hours, then cool to 80℃ in the furnace; S6: Wire EDM: The part and substrate described in S5 are separated by a dedicated wire EDM machine. The cutting machine is a medium-speed wire cutting device. During cutting, the molybdenum wire should be kept in close contact with the substrate surface to prevent damage to the part. S7: Removal of Supports: Remove excess mesh supports from the blade parts separated in S5 using a hand-grinding method. Lightly grind the outer surface of the blade with a small grinding wheel to remove any adhering metal powder. After polishing, use 120# white corundum abrasive at 0.4 MPa pressure for sandblasting. Protect the blade cavity openings with white adhesive tape to prevent sand particles from entering and causing contamination. See the actual finished blade for reference. Figure 4 ; S8: Flaw Detection Inspection: The blade parts described in S7 shall be inspected using X-ray and fluorescence inspection methods to detect the internal and external quality of the blades. The X-ray flaw detection method shall be performed in accordance with HB / Z 20160, requiring that there be no internal defects such as pores, inclusions and microcracks; the fluorescence inspection method shall be performed in accordance with HB / Z 61, requiring that there be no defects such as pores and linear defects on the surface of the parts; One of the composition systems (K438) of a nickel-based cast superalloy is as follows: Cr: 15.7%–16.3%, Co: 8.0%–9.0%, W: 2.4%–2.8%, Mo: 2.0%–2.5%, Ti: 2.5%–3.0%, Al: 2.6%–3.1%, Nb: 1.2%–1.7%, Ta: 1.5%–2.0%, Zr: 0.05%–0.15%, Fe≤0.5%, Si≤0.3%, C≤0.15%, Ni balance; Among them, a laser selective melting forming method for nickel-based cast high-temperature alloy guide vanes has the following process parameters: (1) Laser power of the part body = 260W~340W, scanning speed = 700mm / s~1100mm / s, overlap distance = 0.08mm~0.16mm, powder layer thickness = 30μm~40μm; (2) Support power = 200W~380W, support scanning speed = 1500mm / s~2500mm / s, powder layer thickness = 30μm~40μm. The substrate heating temperature is 80℃~200℃; One of the heat treatment processes for laser selective melting forming blades includes solution treatment: heating to 1000℃~1200℃ at a rate of 8℃~15℃ / min and holding for 1h~5h, then cooling to 300℃ in the furnace, purging with argon gas and cooling to 80℃~100℃ before exiting the furnace. Aging treatment: Heat to 600℃~900℃ at a rate of 8℃~15℃ / min and hold for 20h~36h, then cool in the furnace to 80℃~100℃ before unloading. One method for laser selective melting forming of guide vanes is characterized by forming at a perpendicular angle to the substrate and using a grid support. The vanes are additively manufactured using powder materials (requirement 1), forming processes (requirement 2), and heat treatment (requirement 3), resulting in no cracking issues and achieving metallurgical structure and mechanical properties comparable to castings.

[0031] The above detailed embodiments are a description of the present invention. It should not be considered that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, several simple deductions and substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the protection scope of the present invention.

Claims

1. An additive manufacturing method for nickel-based cast superalloy blades, characterized in that, The method includes: S1: Material preparation: Take 200Kg of casting high-temperature alloy powder from the vacuum-packed sealed container for later use; S2: Powder drying: Dry the powder material described in S1 in a vacuum explosion-proof drying oven; S3: Support Design: Import the 3D model of the guide vane into the support design software for laser selective melting forming, adjust the placement and posture, and add supports on the hanging surface where forming is dangerous to ensure the part is printed. S4: Additive manufacturing forming: The metal powder in S2 is loaded into the laser selective melting forming equipment, and the model after adding support design as described in S3 is transferred to the equipment. Reasonable forming process parameters are set to print the part and support layer by layer to obtain the guide vane part with support excess. The formed part is sintered and connected to the substrate. S5: Solution aging treatment: The blade parts in S4, together with the forming substrate, undergo solution aging heat treatment to achieve control of microstructure and properties. S6: Wire EDM: The parts and substrate in S5 are cut and separated using a dedicated wire EDM machine; S7: Remove support: Remove the excess support of the blade parts separated in S5 by machining or fitter to obtain the hollow blade parts of the guide. Polish the blade surface by fitter and then sandblast. S8: Flaw Detection Inspection: The blade parts in S7 are inspected using X-ray and fluorescence inspection methods to check the internal and external quality of the blades. The internal parts are required to be free of pores, inclusions and microcracks; the external surfaces are required to be free of pores and linear defects.

2. The method according to claim 1, characterized in that, In S1, the chemical composition of the cast high-temperature alloy powder is optimized to reduce the content of Al and Ti elements and reduce the content of the low-melting-point eutectic phase γ', i.e., Ni3 (AlTi), thereby reducing the tendency for hot cracking. The specific composition (wt.%) is as follows: Cr: 15.7%–16.3%, Co: 8.0%–9.0%, W: 2.4%–2.8%, Mo: 2.0%–2.5%, Ti: 2.5%–3.0%, Al: 2.6%–3.1%, Nb: 1.2%–1.7%, Ta: 1.5%–2.0%, Zr: 0.05%–0.15%, Fe≤0.5%, Si≤0.3%, C≤0.15%, Ni balance.

3. The method according to claim 2, characterized in that, In S2, the drying process is carried out at 80℃~100℃ for 1h~2h, and the vacuum degree of the oven is (0.5~1.0)×10. -3 Pa.

4. The method according to claim 3, characterized in that, In S3, the blades are placed at a 90° angle perpendicular to the substrate, the support type for the overhang is a grid support, and the substrate material is GH4169.

5. The method according to claim 4, characterized in that, In S4, the laser selective melting forming process parameters are: (1) Laser power of the part body = 260W~340W, scanning speed = 700mm / s~1100mm / s, overlap distance = 0.08mm~0.16mm, powder layer thickness is 30μm~40μm; (2) Support power = 200W~380W, support scanning speed = 1500mm / s~2500mm / s, powder layer thickness is 30μm~40μm, substrate heating temperature is 80℃~200℃.

6. The method according to claim 5, characterized in that, In S5, the solution aging process is vacuum heat treatment. Solution treatment: heat to 1000℃~1200℃ at a rate of 8℃~15℃ / min, hold for 1h~5h, cool with furnace to 300℃, purge with argon and cool to 80℃~100℃ before taking out of furnace. Aging treatment: Heat to 600℃~900℃ at a rate of 8℃~15℃ / min and hold for 20h~36h, then cool in the furnace to 80℃~100℃ before unloading.

7. The method according to claim 6, characterized in that, In S6, the wire EDM equipment is a medium-speed wire EDM equipment; In S7, excess mesh supports are removed manually using a fitter's method, and the outer surface of the blade is ground and polished with a pneumatic milling cutter or a small grinding wheel to remove powder particles adhering to the surface. After polishing, the surface of the part is sandblasted with 80# to 120# white corundum sand at a pressure of 0.2MPa to 0.6MPa, taking care to prevent contamination of the blade's inner cavity.

8. The method according to claim 7, characterized in that, In S8, the X-ray flaw detection method shall be performed in accordance with HB / Z 20160, and the fluorescence inspection method shall be performed in accordance with HB / Z 61; the casting high-temperature alloy powder material used for additive manufacturing is K438 alloy; The envelope length × width × height of the hollow blade of the guide is 30mm × 4mm × 22mm.

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