Additive manufacturing of high temperature alloy prints and methods of making the same

Abstract

The application relates to additive manufacturing of a high-temperature alloy printed piece and a preparation method thereof, and relates to the technical field of additive manufacturing. The main technical scheme is as follows: the additive manufacturing of the high-temperature alloy printed piece is prepared by the following steps: laser selective melting forming treatment is carried out on a high-temperature alloy powder to obtain a deposited additive manufacturing high-temperature alloy printed piece; wherein the process parameters of the laser selective melting forming treatment are set as follows: the laser power is 220-260 W, the scanning interval is 0.03-0.05 mm, the scanning speed is 1000-1100 mm / s, the layer thickness is 30-50 mu m, and the spot diameter is 150-180 mu m. The application is mainly used for preparing the additive manufacturing high-temperature alloy printed piece with the inclined growth columnar crystal.

Description

Technical Field

[0001] This invention relates to the field of additive manufacturing technology, and in particular to an additively manufactured high-temperature alloy printed part and its preparation method. Background Technology

[0002] High-temperature alloys are widely used in the manufacture of turbine blades for aero-engines and gas engines due to their excellent mechanical strength, high corrosion resistance, good surface stability and high creep resistance.

[0003] Typically, to meet the requirements of high-temperature mechanics or long-term service, turbine blades need to be printed as hollow structures with a single-crystal or directionally solidified internal structure. However, vertically printed turbine blades usually require a large number of internal support structures to ensure the formability of the printed blade. But these internal supports cannot be removed after the turbine blade is formed, thus compromising the original structure of the turbine blade.

[0004] To minimize the need for additional internal support in hollow turbine blades, they need to be printed at a certain angle. However, during selective laser melting (SLM), there is a mismatch between the directional solidification structure of the tilted-printed hollow turbine blade and the direction of force applied to the blade. Here, tilted columnar crystals can be used to match the tilted-printed hollow turbine blade, thus meeting the required mechanical properties.

[0005] In summary, achieving tilted growth of columnar crystals during the printing process is of great significance for printing unsupported, directional solidification hollow turbine blades. Summary of the Invention

[0006] In view of this, the present invention provides an additive manufacturing high-temperature alloy printed part and a method for preparing the same, the main purpose of which is to prepare additive manufacturing high-temperature alloy printed parts with tilted columnar crystal growth.

[0007] To achieve the above objectives, the present invention mainly provides the following technical solutions:

[0008] On one hand, embodiments of the present invention provide a method for preparing additively manufactured high-temperature alloy printed parts, which includes the following steps:

[0009] Laser selective melting forming step: High-temperature alloy powder is subjected to laser selective melting forming process to obtain deposited additive manufacturing high-temperature alloy printed parts;

[0010] The process parameters for the laser selective melting forming process are set as follows: laser power of 220-260W, scanning spacing of 0.03-0.05mm, scanning rate of 1000-1100mm / s, layer thickness of 30-50μm, and spot diameter of 150-180μm.

[0011] Preferably, in the laser selective melting forming step, by controlling the process parameters, the ratio of molten pool height to molten pool overlap rate is less than 1.9 mm, and the ratio of molten pool width to molten pool overlap rate is less than 1.4 μm. It should be noted that: molten pool height refers to the distance between the top and deepest point of the uppermost molten pool in the printed sample; molten pool width refers to the widest distance at the top of the molten pool; and overlap rate refers to the overlap length of adjacent molten pools divided by the molten pool width. The molten pool height, molten pool width, and molten pool overlap length are measured using a metallographic microscope.

[0012] Preferably, the particle size of the high-temperature alloy powder is 15–53 μm.

[0013] Preferably, the high-temperature alloy needs to be vacuum dried before the laser selective melting and forming step; preferably, the vacuum drying temperature is 150-200°C and the vacuum drying time is 3-5 hours.

[0014] Preferably, before performing laser selective melting and forming on the high-temperature alloy powder, a first layer of high-temperature alloy powder needs to be laid on the forming platform inside the forming chamber of the laser selective melting and forming equipment. Then, the laser selective melting and forming equipment is purged. After the oxygen content in the forming chamber drops to a preset level of 40 ppm, the forming chamber is preheated to a preset temperature of 100-200°C. Preferably, the thickness of the first layer of high-temperature alloy powder is 30-50 μm.

[0015] Preferably, before laser selective melting forming, the model needs to be modified, allowances added, placement orientation selected, supports added, parameters set, and model segmented according to the required printed parts, and the corresponding process documents are output to the laser selective melting forming equipment.

[0016] Preferably, if the alloy system of the additively manufactured high-temperature alloy printed part is the ZGH451 alloy system, then the bulk energy density must be lower than 166 J / mm² during the laser selective melting forming process. 3 .

[0017] Preferably, if the alloy system of the additively manufactured high-temperature alloy printed part is the GH4169 alloy system, then the bulk energy density must be lower than 288 J / mm² during the laser selective melting forming process. 3 .

[0018] Preferably, the microstructure of the deposited additive manufacturing high-temperature alloy printed part has columnar crystals that grow at an angle of 15 to 35° to the construction direction.

[0019] Preferably, during the laser selective melting forming step: after each printed part of a set height segment is formed, the printed part is subjected to laser remelting printing treatment to remove impurities; preferably, the laser power of the laser remelting printing treatment is 190-200W, the scanning spacing is 0.05-0.06mm, the scanning rate is 1000-1100mm / s, and the spot diameter is 150-180μm; preferably, if the alloy system of the additive manufacturing high-temperature alloy printed part is the ZGH451 alloy system, then the volume energy density of the laser remelting printing treatment is not higher than 115J / mm². 3 Preferably, if the alloy system of the additively manufactured high-temperature alloy printed part is the GH4169 alloy system, then the volume energy density of the laser remelting printing process is not higher than 133.3 J / mm². 3 Preferably, the model processed by laser remelting printing should be set to overlap with the forming model in the modeling software to ensure that the same layer of remelting laser does not shift during the printing process.

[0020] Preferably, the method for preparing the additively manufactured high-temperature alloy printed part further includes:

[0021] Stress relief treatment step: The deposited additive manufacturing high-temperature alloy printed part is subjected to stress relief treatment to obtain the stress-relieved additive manufacturing high-temperature alloy printed part;

[0022] Preferably, in the stress-relief treatment step: the vacuum furnace is evacuated, and the printed part is heated to 750-800°C in the vacuum furnace and held at that temperature for 3-5 hours. After the holding period, it is cooled to obtain the stress-relief printed part. More preferably, the heating rate of the printed part to 750-800°C is 2-5°C / min. More preferably, the cooling method is furnace cooling.

[0023] Preferably, after the stress relief treatment step, the method further includes:

[0024] Hot isostatic pressing (HOP) step: The stress-relieved additive high-temperature alloy printed part is heated to 1100-1200℃ and pressurized to 150-180MPa for hot isostatic pressing for 2-4 hours. After cooling, the heat-treated additive high-temperature alloy printed part is obtained.

[0025] Preferably, in the hot isostatic pressing step, the heating rate of the stress-relieved additive manufacturing high-temperature alloy printed part to 1100-1200°C is 10-20 k / min.

[0026] Preferably, in the hot isostatic pressing step, the cooling rate is 30-40 k / min.

[0027] Preferably, if the alloy system of the additively manufactured high-temperature alloy printed part is the ZGH451 alloy system, then by weight percentage, the additively manufactured high-temperature alloy printed part comprises the following chemical composition: Al 4-5wt%, B 0.015-0.020wt%, C 0.05-0.08wt%, Co 7-9wt%, Cr 7-9wt%, Mo 1.5-2.5wt%, Ta 5-7wt%, Ti 1-2wt%, W 7-9wt%, with the balance being Ni;

[0028] Preferably, if the alloy system of the additively manufactured high-temperature alloy printed part is the GH4169 alloy system, then the additively manufactured high-temperature alloy printed part comprises the following chemical composition by weight percentage:

[0029] C ≤ 0.08 wt%, Cr 17.0–21.0 wt%, Ni 50–55 wt%, Co ≤ 1.00 wt%, Mo 2.8–3.30 wt%, Al 0.20–0.8 wt%, Ti 0.65–1.15 wt%, Nb 4.75–5.50 wt%, B ≤ 0.006 wt%, Mn ≤ 0.35 wt%, Si ≤ 0.35 wt%, S ≤ 0.015 wt%, Cu ≤ 0.30 wt%, P ≤ 0.015 wt%, Fe is the balance.

[0030] On the other hand, embodiments of the present invention provide an additively manufactured high-temperature alloy printed part, wherein the microstructure of the additively manufactured high-temperature alloy printed part has columnar crystals that grow at an angle of 15-35° to the construction direction; preferably, the microstructure of the additively manufactured high-temperature alloy printed part is free of cracks and pores; preferably, if the alloy system of the additively manufactured high-temperature alloy printed part is the ZGH451 alloy system, at room temperature, the heat-treated additively manufactured high-temperature alloy part has σb≥991MPa, σ0.2≥772MPa, and A≥16.5%; at a temperature of 1000℃±5℃, the heat-treated additively manufactured nickel-based high-temperature alloy has σb≥405MPa. The additive high-temperature alloy printed part has the following properties: σb≥308MPa, A≥17%; preferably, if the alloy system of the additive high-temperature alloy printed part is GH4169 alloy system, at room temperature, the heat-treated additive high-temperature alloy printed part has σb≥900MPa, σ0.2≥500MPa, and A≥16%; at a temperature of 650℃±5℃, the heat-treated additive nickel-based high-temperature alloy has σb≥650MPa, σ0.2≥300MPa, and A≥12%; preferably, the additive high-temperature alloy printed part is obtained by the preparation method of additive high-temperature alloy printed part described in any one of the above claims; preferably, the additive high-temperature alloy printed part is a turbine blade.

[0031] Compared with the prior art, the additive manufacturing high-temperature alloy printed part and its preparation method of the present invention have at least the following beneficial effects:

[0032] On one hand, embodiments of the present invention provide a method for preparing additively manufactured high-temperature alloy printed parts, including the following steps: laser selective melting forming treatment of high-temperature alloy powder to obtain a deposited additively manufactured high-temperature alloy printed part. The process parameters for laser selective melting forming treatment are set as follows: laser power of 220–260 W, scanning interval of 0.03–0.05 mm, scanning rate of 1000–1100 mm / s, layer thickness of 30–50 μm, and spot diameter of 150–180 μm. It should be noted that when the laser power is 220–260 W, the curvature at the bottom of the molten pool is relatively gentle. When the scanning interval is 0.03–0.05 mm, the molten pool can be significantly remelted, allowing the cellular structure on one side to always grow epitaxially, thus evolving into tilted grains (the scanning interval determines whether the columnar crystals are tilted, and the power has the most significant impact on the molten pool morphology; therefore, the power determines the tilt angle). Therefore, in this embodiment of the invention, by setting the process parameters of the laser selective melting forming process to the above-mentioned range, additive manufacturing high-temperature alloy printed parts with tilted columnar crystal growth can be successfully prepared. Furthermore, the molten pool size (curvature of the molten pool bottom) determines the tilt angle, and the molten pool size is determined by all the above-mentioned process parameters. In the microstructure of the deposited additive manufacturing high-temperature alloy printed part: the tilt angle of the columnar crystals depends on the ratio of the molten pool height to the molten pool overlap rate, and the ratio of the molten pool width to the molten pool overlap rate; wherein, tilted growth of columnar crystals can only be achieved when the ratio of the molten pool height to the molten pool overlap rate is less than 1.9 mm and the ratio of the molten pool width to the molten pool overlap rate is less than 1.4 μm; preferably, the tilt angle of the columnar crystals is inversely proportional to the ratio of the molten pool height to the molten pool overlap rate, and the ratio of the molten pool width to the molten pool overlap rate.

[0033] Furthermore, this invention provides a method for preparing additively manufactured high-temperature alloy printed parts. During the selective laser melting process: after each printed part of a set height segment is formed, the printed part undergoes laser remelting printing to remove impurities. The laser power for the laser remelting printing is 190–200 W, the scanning spacing is 0.05–0.06 mm, the scanning rate is 1000–1100 mm / s, and the spot diameter is 150–180 μm. By adding a laser remelting printing step and setting corresponding parameters, impurities in the printed part can be effectively removed (the reduction in impurity quantity is most significant after laser remelting, and the remelted pool lines are clearly layered). Laser remelting also increases the input bulk energy density, reduces the cooling rate, and improves epitaxial growth capability.

[0034] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0035] Figure 1 This is an EBSD image of the tilted columnar crystals of the ZGH451 high-temperature alloy printed part produced by additive manufacturing in the deposition state in Example 1;

[0036] Figure 2 This is a diagram of the tilted columnar crystal microstructure of the ZGH451 high-temperature alloy printed part in the heat-treated additive manufacturing process in Example 1.

[0037] Figure 3 This is an EBSD image of the tilted columnar crystals of the GH4169 high-temperature alloy printed part produced by additive manufacturing in the deposition state in Example 2;

[0038] Figure 4 This is an EBSD image of the tilted columnar crystals of the GH4169 high-temperature alloy printed part produced by additive manufacturing in Example 3.

[0039] Figure 5 This is an EBSD image of the tilted columnar crystals of the ZGH451 high-temperature alloy printed part produced by additive manufacturing in the deposition state in Example 4;

[0040] Figure 6 EBSD image of the high-temperature alloy printed part produced by additive manufacturing in Comparative Example 1;

[0041] Figure 7 The hollow blade printed in Embodiment 5 of the present invention has no internal support and has an inclined solidified structure. Detailed Implementation

[0042] To further illustrate the technical means and effects adopted by the present invention to achieve the intended purpose, the specific embodiments, structures, features, and effects according to the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "embodiments" or "embodiments" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0043] The technical problem solved by this invention is to innovatively achieve a tilted growth solidification structure, thus resolving the mismatch between the directional solidification structure direction and the stress direction of the tilted printed hollow blade during laser selective melting forming. This allows the tilted printed alloy to possess the same tilted growth solidification structure. Specifically, the solution of this invention is as follows:

[0044] On one hand, embodiments of the present invention provide a method for preparing additively manufactured high-temperature alloy printed parts, which includes the following steps:

[0045] Select high-temperature alloy powder: Screen high-temperature alloy powder with a particle size of 15-53μm, dry it in a vacuum environment of 150-200℃ for 3-5 hours, and then load it into a laser selective melting and forming equipment for later use.

[0046] Laser selective melting forming step: High-temperature alloy powder is subjected to laser selective melting forming process to obtain high-temperature alloy printed parts in deposition state additive manufacturing.

[0047] Before the selective laser melting (SLM) forming process: Prepare the SLM equipment, install the scraper and substrate (the scraper is a flexible scraper designed to reduce the force exerted on the already formed portion of the workpiece during powder spreading), and inspect the equipment. Lay a layer of powder, 30–50 μm thick, on the forming platform within the forming chamber. Purge the SLM equipment until the oxygen content in the forming chamber drops to a preset level of 40 ppm, then preheat the chamber to a preset temperature of 100–200°C. Once the powder has reached the preheated temperature, the forming process can begin.

[0048] The laser selective melting forming process for high-temperature alloy powder includes the following steps: modifying the model of the part to be formed (it should be noted that for model modification, the previous forming process and the next remelting process can be set as two overlapping models, but with different printing orders), adding allowance, selecting placement orientation, adding supports, setting parameters, and splitting the model, and outputting the corresponding process file to the laser selective melting forming equipment. Laser selective melting forming is then performed using the set process parameters until a complete printed part is formed. The set process parameters are: laser power of 220–260W, scanning spacing of 0.03–0.05mm, scanning rate of 1000–1100mm / s, layer thickness of 30–50μm, and spot diameter of 150–180μm.

[0049] Volume energy density set below 166 J / mm 3 (The calculation formula is: p / (v×d×h), where p represents power, v represents scanning speed, d represents scanning spacing, and h represents layer thickness).

[0050] If the alloy system of the additive manufacturing high-temperature alloy printed part is ZGH451 alloy system, then during the laser selective melting forming process, the volume energy density is set to be lower than 166 J / mm². 3(The calculation formula is: p / (v×d×h), where p represents power, v represents scanning speed, d represents scanning spacing, and h represents layer thickness).

[0051] If the alloy system for additive manufacturing of high-temperature alloy printed parts is GH4169 alloy system, then the bulk energy density must be lower than 288 J / mm² during the laser selective melting forming process. 3 .

[0052] Preferably, during the laser selective melting and forming process: after each printed part of a set height segment is formed, the printed part is subjected to laser remelting printing treatment to remove impurities from the printed part.

[0053] In the laser remelting printing process, the volume energy density must be lower than that of the original printed alloy (laser selective melting forming process) so that the original tilted solidified structure can be preserved and the impurities on the molten pool can be remelted away.

[0054] Preferably, the laser power of the laser remelting printing process is 190-200W, the scanning spacing is 0.05-0.06mm, the scanning rate is 1000-1100mm / s, and the spot diameter is 150-180μm.

[0055] Preferably, during the laser remelting printing process, the model for laser remelting printing should be set in the modeling software (SolidWorks) to coincide with the original model (forming model, i.e. the model used for laser selective melting forming), that is, shift focus = 0, so as to ensure that the laser remelting of the same layer does not shift during the printing process.

[0056] Preferably, if the alloy system of the additively manufactured high-temperature alloy printed part is the ZGH451 alloy system, then the volume energy density of the laser remelting printing process is not higher than 115 J / mm². 3 Preferably, if the alloy system of the additively manufactured high-temperature alloy printed part is the GH4169 alloy system, then the volume energy density of the laser remelting printing process is not higher than 133.3 J / mm². 3 .

[0057] Preferably, the method for preparing additively manufactured high-temperature alloy printed parts provided in this embodiment of the invention further includes the following steps:

[0058] Stress relief treatment step: The deposited additive manufacturing high-temperature alloy printed part is subjected to stress relief treatment to obtain the stress-relieved additive manufacturing high-temperature alloy printed part;

[0059] Preferably, in the stress-relief treatment step: the vacuum furnace is evacuated, and the printed part is heated to 750-800°C in the vacuum furnace and held at that temperature for 3-5 hours. After the holding period, it is cooled to obtain the stress-relief printed part. More preferably, the heating rate of the printed part to 750-800°C is 2-5°C / min. More preferably, the cooling method is furnace cooling.

[0060] Further preferably, after the stress relief treatment step, the method further includes:

[0061] Hot isostatic pressing (HOP) step: The stress-relieved additive high-temperature alloy printed part is heated to 1100-1200℃ and pressurized to 150-180MPa for 2-4 hours. After cooling, the heat-treated additive high-temperature alloy printed part is obtained.

[0062] Preferably, in the hot isostatic pressing step, the heating rate of the stress-relieved additive manufacturing high-temperature alloy printed part to 1100-1200°C is 10-20 K / min; preferably, in the hot isostatic pressing step, the cooling rate is 30-40 K / min.

[0063] On the other hand, embodiments of the present invention provide an additively manufactured high-temperature alloy printed part, wherein the microstructure of the additively manufactured high-temperature alloy printed part has columnar crystals that grow at an inclined angle to the construction direction; the angle between the columnar crystals and the construction direction is 20-40°; and there are no cracks or pores inside the microstructure of the additively manufactured high-temperature alloy printed part.

[0064] Preferably, if the alloy system of the additively manufactured high-temperature alloy printed part is the ZGH451 alloy system, at room temperature, the heat-treated additively manufactured high-temperature alloy part has σb≥991MPa, σ0.2≥772MPa, and A≥16.5%; at a temperature of 1000℃±5℃, the heat-treated additively manufactured nickel-based high-temperature alloy has σb≥405MPa, σ0.2≥308MPa, and A≥17%.

[0065] Preferably, if the alloy system of the additively manufactured high-temperature alloy printed part is the GH4169 alloy system, at room temperature, the heat-treated additively manufactured high-temperature alloy part has σb≥900MPa, σ0.2≥500MPa, and A≥16%; at a temperature of 650℃±5℃, the heat-treated additively manufactured nickel-based high-temperature alloy has σb≥650MPa, σ0.2≥300MPa, and A≥12%.

[0066] Furthermore, this invention pertains to the ZGH451 alloy system and the GH4169 alloy system. The specific composition (wt%) of the ZGH451 alloy system is as follows: Al 4–5 wt%, B 0.015–0.020 wt%, C 0.05–0.08 wt%, Co 7–9 wt%, Cr 7–9 wt%, Mo 1.5–2.5 wt%, Ta 5–7 wt%, Ti 1–2 wt%, W 7–9 wt%, with the balance being Ni.

[0067] The specific composition of the GH4169 alloy system is as follows: C (carbon) ≤ 0.08 wt%, Cr (chromium) 17.0–21.0 wt%, Ni (nickel) 50–55 wt%, Co (cobalt) ≤ 1.00 wt%, Mo (molybdenum) 2.8–3.30 wt%, Al (aluminum) 0.20–0.8 wt%, Ti (titanium) 0.65–1.15 wt%, Fe (iron) balance, Nb (niobium) 4.75–5.50 wt%, B (boron) ≤ 0.006 wt%, Mn (manganese) ≤ 0.35 wt%, Si (silicon) ≤ 0.35 wt%, S (sulfur) ≤ 0.015 wt%, Cu (copper) ≤ 0.30 wt%, P (phosphorus) ≤ 0.015 wt%.

[0068] The present invention will be further illustrated below through specific embodiments and comparative examples.

[0069] Example 1

[0070] This embodiment describes the preparation of an additively manufactured ZGH451 high-temperature alloy printed part with columnar crystals at a 30° angle to the construction direction. The main steps include the following:

[0071] 1) Selection and pretreatment of forming powder:

[0072] High-performance high-temperature alloy powder with a particle size of 15-53μm was screened, dried in a vacuum environment at 170℃ for 4 hours, and then loaded into a laser selective melting and forming equipment for use. The water level of the equipment's water cooler was checked to ensure it reached the water level line height. The temperature of the laser in the equipment was then checked to ensure it operated at room temperature.

[0073] 2) Equipment preparation and preheating;

[0074] A flexible scraper that reduces the force exerted on the formed part during the powder spreading process is used as the powder spreading scraper. Before installing the flexible scraper, a rigid scraper is used to measure the distance between the substrate and the scraper to ensure it is greater than 0.5 mm. After installing the scraper and the substrate and checking the equipment condition, gas washing is started. Once the oxygen content in the forming chamber is below 40 ppm, the forming chamber is preheated to 200°C. Then, a 50 μm layer of powder is spread on the forming platform. Once the spread powder has reached the preheating temperature, the forming process can begin.

[0075] 3) Laser selective melting forming process and laser remelting printing process:

[0076] The process involves modifying the model, adding allowances, and selecting the orientation of the printed parts. For the printed samples, a 90° orientation is sufficient. Printing performance characterization parts requires adjusting the angle corresponding to the solidification structure, adding supports, setting parameters, and meshing the model. During model setup, the model for sample forming and the model for remelting must be completely aligned. Then, the sample forming model is assigned printing process parameters, while the remelting model is assigned remelting process parameters. Finally, the model and process parameters are imported into the laser selective melting equipment.

[0077] The laser selective melting forming parameters are as follows: laser power 260W, scanning spacing 0.05mm, scanning rate 1100mm / s, layer thickness 50μm, and spot diameter 180μm. The volume energy density = power / (scanning rate × scanning spacing × layer thickness) = 94.5J / mm². 3 ;

[0078] The laser remelting printing process parameters are: laser power 200W, scanning spacing 0.06mm, scanning speed 1100mm / s, and spot diameter 180μm. The volume energy density = power / (scanning speed × scanning spacing × layer thickness) = 60.6J / mm². 3 ;

[0079] 4) After the equipment cools down, remove the printed parts and perform operations such as powder cleaning to obtain the desired printed parts. After removing the printed parts, place the printed parts with the substrate directly into the vacuum furnace and heat them to 800°C at a heating rate of 5°C / min. Hold them at this temperature for 5 hours to relieve stress. After the holding period, cool them in the furnace to obtain the stress-relieved printed parts.

[0080] Subsequently, the stress-relieved printed parts undergo subsequent operations such as substrate removal and support removal. Finally, they are placed in a hot isostatic pressing furnace for hot isostatic pressing treatment (the temperature of the hot isostatic pressing treatment is 1200℃, the pressure is 180MPa, and the time is 4h) to remove minor defects and prepare for subsequent mechanical property testing.

[0081] Figure 1 This is an EBSD image of the tilted columnar crystals of the high-temperature alloy printed part produced by additive manufacturing in Example 1. Figure 2 This is a diagram of the tilted columnar crystal microstructure of the heat-treated additively manufactured high-temperature alloy printed part from Example 1. From... Figure 1 and Figure 2As can be seen, the columnar crystal phase is tilted relative to the printing direction (construction direction) at an angle of 30°. Furthermore, the melt pool depth is 0.75 mm, the melt pool width is 1.1 μm, the overlap ratio is 0.9, the melt pool depth / overlap ratio is 0.83 mm, and the melt pool width / overlap ratio is 1.22 μm.

[0082] The mechanical properties of the heat-treated additively manufactured high-temperature alloy printed parts prepared in this embodiment are as follows: at room temperature, σb = 1390 MPa, σ0.2 = 772 MPa, A = 22%; at a temperature of 1000℃, σb = 405 MPa, σ0.2 = 308 MPa, A = 33%.

[0083] Example 2

[0084] This embodiment describes the preparation of an additively manufactured GH4169 high-temperature alloy printed part with columnar crystals at a 30° angle to the construction direction. The main steps include the following:

[0085] 1) Selection and pretreatment of forming powder:

[0086] High-performance high-temperature alloy powder with a particle size of 15-53μm was screened, dried in a vacuum environment at 190℃ for 3.5h, and then loaded into a laser selective melting and forming equipment for use. The water level of the equipment's water cooler was checked to ensure it reached the water level line height. The laser temperature of the equipment was then checked to ensure it operated at room temperature.

[0087] 2) Equipment preparation and preheating;

[0088] A flexible scraper that reduces the force exerted on the formed part during the powder spreading process is used as the powder spreading scraper. Before installing the flexible scraper, a rigid scraper is used to measure the distance between the substrate and the scraper to ensure it is greater than 0.5 mm. After installing the scraper and the substrate and checking the equipment condition, gas washing is started. Once the oxygen content in the forming chamber is below 40 ppm, the forming chamber is preheated to 150°C. Then, a 40 μm layer of powder is spread on the forming platform. Once the spread powder has reached the preheating temperature, the forming process can begin.

[0089] 3) Laser selective melting forming process and laser remelting printing process:

[0090] The process involves modifying the model, adding allowances, and selecting the orientation of the printed parts. For the printed samples, a 90° orientation is sufficient. Printing performance characterization parts requires adjusting the angle corresponding to the solidification structure, adding supports, setting parameters, and meshing the model. During model setup, the model for sample forming and the model for remelting must be completely aligned. Then, the sample forming model is assigned printing process parameters, while the remelting model is assigned remelting process parameters. Finally, the model and process parameters are imported into the laser selective melting equipment.

[0091] The laser selective melting forming parameters are as follows: laser power 240W, scanning spacing 0.04mm, scanning rate 1000mm / s, layer thickness 40μm, and spot diameter 160μm. The volume energy density is calculated as follows: power / (scanning rate × scanning spacing × layer thickness) = 240 / (0.04 × 1000 × 0.04) = 150J / mm². 3 ;

[0092] The laser remelting printing process parameters are: laser power 190W, scanning spacing 0.06mm, scanning speed 1100mm / s, and spot diameter 160μm. The volume energy density is 190 / (0.06×1100×0.04)=72J / mm². 3 .

[0093] 4) After the equipment cools down, remove the printed parts and perform operations such as powder cleaning to obtain the desired printed parts. After removing the printed parts, place the printed parts with the substrate directly into the vacuum furnace and heat them to 800°C at a heating rate of 3°C / min. Hold them at this temperature for 4 hours to relieve stress. After the holding period, cool them in the furnace to obtain the stress-relieved printed parts.

[0094] Subsequently, the stress-relieved printed parts undergo subsequent operations such as substrate removal and support removal. Finally, they are placed in a hot isostatic pressing furnace for hot isostatic pressing treatment (the temperature of the hot isostatic pressing treatment is 1200℃, the pressure is 180MPa, and the time is 4h) to remove minor defects and prepare for subsequent mechanical property testing.

[0095] Figure 3 This is an EBSD image of the tilted columnar crystals of the additively manufactured high-temperature alloy printed part in Example 2; from Figure 3 As can be seen, the columnar crystal phase is tilted relative to the printing direction (construction direction) at an angle of 30°. It should be noted that because the alloy composition of Example 2 differs from that of Example 1, although printing parameters such as power are different, the ratio of molten pool height to molten pool overlap and the ratio of molten pool width to molten pool overlap are similar, resulting in similar tilt angles in the final solidification structure. Furthermore, the molten pool depth is 0.89 mm, the molten pool width is 1.4 μm, the overlap ratio is 1.1, the molten pool depth / overlap ratio is 0.80 mm, and the molten pool width / overlap ratio is 1.27 μm.

[0096] The mechanical properties of the heat-treated additively manufactured high-temperature alloy printed parts prepared in this embodiment are as follows: at room temperature, σb = 1000 MPa, σ0.2 = 580 MPa, A = 22%; at a temperature of 650°C, σb = 800 MPa, σ0.2 = 430 MPa, A = 18%.

[0097] Example 3

[0098] This embodiment describes the preparation of an additively manufactured GH4169 high-temperature alloy printed part with columnar crystals at a 15° angle to the construction direction. The main steps include the following:

[0099] 1) Selection and pretreatment of forming powder:

[0100] High-performance high-temperature alloy powder with a particle size of 15-53μm was screened, dried in a vacuum environment at 150℃ for 3 hours, and then loaded into a laser selective melting and forming equipment for use. The water level of the equipment's water cooler was checked to ensure it reached the water level line height. The temperature of the laser in the equipment was then checked to ensure it operated at room temperature.

[0101] 2) Equipment preparation and preheating;

[0102] A flexible scraper that reduces the force exerted on the formed part during the powder spreading process is used as the powder spreading scraper. Before installing the flexible scraper, a rigid scraper is used to measure the distance between the substrate and the scraper to ensure it is greater than 0.5 mm. After installing the scraper and the substrate and checking the equipment condition, gas washing is started. Once the oxygen content in the forming chamber is below 40 ppm, the forming chamber is preheated to 100°C. Then, a 30 μm layer of powder is spread on the forming platform. Once the spread powder has reached the preheating temperature, the forming process can begin.

[0103] 3) Laser selective melting forming process and laser remelting printing process:

[0104] The process involves modifying the model, adding allowances, and selecting the orientation of the printed parts. For the printed samples, a 90° orientation is sufficient. Printing performance characterization parts requires adjusting the angle corresponding to the solidification structure, adding supports, setting parameters, and meshing the model. During model setup, the model for sample forming and the model for remelting must be completely aligned. Then, the sample forming model is assigned printing process parameters, while the remelting model is assigned remelting process parameters. Finally, the model and process parameters are imported into the laser selective melting equipment.

[0105] The laser selective melting forming parameters are as follows: laser power 220W, scanning spacing 0.03mm, scanning rate 1000mm / s, layer thickness 30μm, and spot diameter 150μm. The volume energy density is 244J / mm². 3 ;

[0106] The laser remelting printing process parameters are as follows: laser power 190W, scanning spacing 0.05mm, scanning speed 1100mm / s, and spot diameter 150μm. The volume energy density is 115J / mm². 3 ;

[0107] 4) After the equipment cools down, remove the printed parts and perform operations such as powder cleaning to obtain the desired printed parts. After removing the printed parts, place the printed parts with the substrate directly into the vacuum furnace and heat them to 750°C at a heating rate of 2°C / min. Hold them at this temperature for 3 hours to relieve stress. After the holding period, cool them in the furnace to obtain the stress-relieved printed parts.

[0108] Subsequently, the stress-relieved printed parts undergo subsequent operations such as substrate removal and support removal. Finally, they are placed in a hot isostatic pressing furnace for hot isostatic pressing treatment (the temperature of the hot isostatic pressing treatment is 1100℃, the pressure is 150MPa, and the time is 2h) to remove minor defects and prepare for subsequent mechanical property testing.

[0109] Figure 4 This is an EBSD image of the tilted columnar crystals of the additively manufactured high-temperature alloy printed part in the deposited state in Example 3; from Figure 4 As can be seen, the columnar crystal phase is tilted relative to the printing direction (construction direction) at an angle of 15°. Furthermore, the melt pool depth is 0.88 mm, the melt pool width is 0.86 μm, the overlap ratio is 0.64, the melt pool depth / overlap ratio is 1.38 mm, and the melt pool width / overlap ratio is 1.34 μm.

[0110] The mechanical properties of the heat-treated additively manufactured high-temperature alloy printed parts prepared in this embodiment are as follows: at room temperature, σb = 980 MPa, σ0.2 = 540 MPa, A = 20%; at a temperature of 650°C, σb = 780 MPa, σ0.2 = 380 MPa, A = 16%.

[0111] Example 4

[0112] This embodiment describes the preparation of an additively manufactured ZGH451 high-temperature alloy printed part with columnar crystals at a 30° angle to the construction direction. The main steps include the following:

[0113] 1) Selection and pretreatment of forming powder:

[0114] High-performance high-temperature alloy powder with a particle size of 15-53μm was screened, dried in a vacuum environment at 170℃ for 4 hours, and then loaded into a laser selective melting and forming equipment for use. The water level of the equipment's water cooler was checked to ensure it reached the water level line height. The temperature of the laser in the equipment was then checked to ensure it operated at room temperature.

[0115] 2) Equipment preparation and preheating;

[0116] A flexible scraper that reduces the force exerted on the formed part during the powder spreading process is used as the powder spreading scraper. Before installing the flexible scraper, a rigid scraper is used to measure the distance between the substrate and the scraper to ensure it is greater than 0.5 mm. After installing the scraper and the substrate and checking the equipment condition, gas washing is started. Once the oxygen content in the forming chamber is below 40 ppm, the forming chamber is preheated to 200°C. Then, a 50 μm layer of powder is spread on the forming platform. Once the spread powder has reached the preheating temperature, the forming process can begin.

[0117] 3) Laser selective melting and forming process:

[0118] The process involves modifying the model, adding allowances, and selecting the orientation of the printed parts. For the printed samples, a 90° orientation is sufficient. Printing performance characterization parts requires adjusting the angle corresponding to the solidification structure, adding supports, setting parameters, and meshing the model. During model setup, the model for sample forming and the model for remelting must be completely aligned. Then, the sample forming model is assigned printing process parameters, while the remelting model is assigned remelting process parameters. Finally, the model and process parameters are imported into the laser selective melting equipment.

[0119] The laser selective melting forming process parameters are as follows: laser power is 260W, scanning interval is 0.05mm, scanning rate is 1100mm / s, layer thickness is 50μm, and spot diameter is 180μm.

[0120] 4) After the equipment cools down, remove the printed parts and perform operations such as powder cleaning to obtain the desired printed parts. After removing the printed parts, place the printed parts with the substrate directly into the vacuum furnace and heat them to 800°C at a heating rate of 5°C / min. Hold them at this temperature for 5 hours to relieve stress. After the holding period, cool them in the furnace to obtain the stress-relieved printed parts.

[0121] Subsequently, the stress-relieved printed parts undergo subsequent operations such as substrate removal and support removal. Finally, they are placed in a hot isostatic pressing furnace for hot isostatic pressing treatment (the temperature of the hot isostatic pressing treatment is 1200℃, the pressure is 180MPa, and the time is 4h) to remove minor defects and prepare for subsequent mechanical property testing.

[0122] Figure 5 This is an EBSD image of the tilted columnar crystals in the deposited additively manufactured high-temperature alloy printed part from Example 4. It can be seen that the columnar crystal phase is tilted relative to the printing direction (build direction), with a tilt angle of 30°. However, compared to Example 1, the microstructure without the remelting process has a higher number of impurity crystals. Furthermore, the melt pool depth is 0.75 mm, the melt pool width is 1.1 μm, the overlap ratio is 0.9, the melt pool depth / overlap ratio is 0.83 mm, and the melt pool width / overlap ratio is 1.22 μm.

[0123] The mechanical properties of the heat-treated additively manufactured high-temperature alloy printed parts prepared in this embodiment are as follows: at room temperature, σb = 991 MPa, σ0.2 = 796 MPa, A = 16.5%; at a temperature of 1000℃, σb = 641 MPa, σ0.2 = 319 MPa, A = 17%.

[0124] Comparative Example 1

[0125] Comparative Example 1 describes the preparation of an additively manufactured high-temperature alloy printed part, which mainly includes the following steps:

[0126] 1) Selection and pretreatment of forming powder:

[0127] High-performance high-temperature alloy powder with a particle size of 15-53μm was screened, dried in a vacuum environment at 160℃ for 4 hours, and then loaded into a laser selective melting and forming equipment for use. The water level of the equipment's water cooler was checked to ensure it reached the water level line height. The laser temperature of the equipment was then checked to ensure it operated at room temperature.

[0128] 2) Equipment preparation and preheating;

[0129] A flexible scraper that reduces the force exerted on the formed part during the powder spreading process is used as the powder spreading scraper. Before installing the flexible scraper, a rigid scraper is used to measure the distance between the substrate and the scraper to ensure it is greater than 0.5 mm. After installing the scraper and the substrate and checking the equipment condition, gas washing is started. Once the oxygen content in the forming chamber is below 40 ppm, the forming chamber is preheated to 110°C. Then, a 40 μm layer of powder is spread on the forming platform. Once the spread powder has reached the preheating temperature, the forming process can begin.

[0130] 3) Laser selective melting forming process and laser remelting printing process:

[0131] The process involves modifying the model, adding allowances, and selecting the orientation of the printed parts. For microstructure samples, a 90° orientation is sufficient. For performance characterization samples, adjustments are needed, including tilting the solidified tissue at the corresponding angle, adding supports, setting parameters, and model segmentation. During model setup, the sample forming model and the remelted model must be completely aligned. The sample forming model is then assigned printing process parameters, while the remelted model is assigned remelting process parameters. Finally, the model and process parameters are imported into the laser selective melting equipment.

[0132] The laser selective melting forming parameters are as follows: laser power 160W, scanning spacing 0.06μm, scanning rate 1000mm / s, layer thickness 30μm, spot diameter 150~180μm, and volume energy density 89J / mm². 3 .

[0133] The laser remelting printing process parameters are as follows: laser power 140W, scanning spacing 0.07μm, scanning speed 1000mm / s, spot diameter 150~180μm, and volume energy density 77J / mm². 3 .

[0134] The EBSD image of the deposited additively manufactured high-temperature alloy printed part prepared in this comparative example is shown in Figure 6. From Figure 6 It can be seen that when the laser selective melting forming process parameters are not within the range defined in this invention, the columnar grains do not tilt. This is because: due to insufficient laser power, the molten pool is too flat, preventing the cell growth direction from tilting vertically upwards; secondly, the scanning interval is too high, resulting in insufficient molten pool remelting, preventing epitaxial growth on one side of the cell growth direction. Furthermore, the molten pool depth is 1.75 mm, the molten pool width is 1.27 μm, the overlap ratio is 0.85, the molten pool depth / overlap ratio is 2.05 mm, and the molten pool width / overlap ratio is 1.49 μm.

[0135] Example 5

[0136] This embodiment prepares a hollow turbine blade, and the printing process parameters for this blade are the same as those in Example 1.

[0137] 1) Selection and pretreatment of forming powder:

[0138] High-performance high-temperature alloy powder with a particle size of 15-53μm was screened, dried in a vacuum environment at 170℃ for 4 hours, and then loaded into a laser selective melting and forming equipment for use. The water level of the equipment's water cooler was checked to ensure it reached the water level line height. The temperature of the laser in the equipment was then checked to ensure it operated at room temperature.

[0139] 2) Equipment preparation and preheating;

[0140] A flexible scraper that reduces the force exerted on the formed part during the powder spreading process is used as the powder spreading scraper. Before installing the flexible scraper, a rigid scraper is used to measure the distance between the substrate and the scraper to ensure it is greater than 0.5 mm. After installing the scraper and the substrate and checking the equipment condition, gas washing is started. Once the oxygen content in the forming chamber is below 40 ppm, the forming chamber is preheated to 200°C. Then, a 50 μm layer of powder is spread on the forming platform. Once the spread powder has reached the preheating temperature, the forming process can begin.

[0141] 3) Laser selective melting forming process and laser remelting printing process:

[0142] The blade model to be formed is derived from an existing mature model. The blade is positioned at a 30° angle for printing. Supports are added, parameters are set, and the model is split. During model setup, the sample forming model and the remelted model must be completely overlapped. Then, the sample forming model is assigned printing process parameters, while the remelted model is assigned remelting process parameters. Finally, the model and process parameters are imported together into the laser selective melting equipment.

[0143] The laser selective melting forming parameters are as follows: laser power 260W, scanning spacing 0.05mm, scanning rate 1100mm / s, layer thickness 50μm, spot diameter 180μm, and volume energy density 94.5J / mm². 3 .

[0144] The laser remelting printing process parameters are as follows: laser power 200W, scanning spacing 0.06mm, scanning speed 1100mm / s, spot diameter 180μm, and volume energy density 60.6J / mm². 3 .

[0145] 4) After the equipment cools down, remove the printed parts and perform operations such as powder cleaning to obtain the desired printed parts. After removing the printed parts, place the printed parts with the substrate directly into the vacuum furnace and heat them to 800°C at a heating rate of 5°C / min. Hold them at this temperature for 5 hours to relieve stress. After the holding period, cool them in the furnace to obtain the stress-relieved printed parts.

[0146] Subsequently, the stress-relieved printed parts undergo subsequent operations such as substrate removal and support removal. Finally, they are placed in a hot isostatic pressing furnace for hot isostatic pressing treatment (the temperature of the hot isostatic pressing treatment is 1200℃, the pressure is 180MPa, and the time is 4h) to remove minor defects and prepare for subsequent mechanical property testing.

[0147] Figure 7 The image shows the overall structure of the blade of the high-temperature alloy printed part produced by additive manufacturing in Example 5, including the hollow structure and the tilted columnar crystal EBSD image. It can be seen that the columnar crystals have the same tilt angle along the printing direction (construction direction), and the tilt angle is 30°.

[0148] Figure 7 Figure a shows the overall structure of the inclined blade, and Figure b shows the internal structure of the blade, demonstrating that it has a complete air-cooled structure without internal support. Figure 7 Figure c shows the solidified structure inside the blade, displaying columnar crystals with the same tilt angle as the blade.

[0149] In summary, the additively manufactured high-temperature alloy printed parts prepared in the embodiments of the present invention have columnar crystals with tilted growth, few impurities, and also possess advantages such as high strength at medium and high temperatures and good plasticity at high temperatures. Therefore, the preparation process in the embodiments of the present invention has broad application prospects.

[0150] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention shall still fall within the scope of the technical solution of the present invention.

Claims

1. A method for preparing additively manufactured high-temperature alloy printed parts, characterized in that, It includes the following steps: Laser selective melting forming step: High-temperature alloy powder is subjected to laser selective melting forming process to obtain deposited additive manufacturing high-temperature alloy printed parts; The process parameters for the laser selective melting and forming process are set as follows: The laser power is 220~260W, the scanning spacing is 0.03~0.05mm, the scanning rate is 1000~1100mm / s, the layer thickness is 30~50μm, and the spot diameter is 150~180μm; In the laser selective melting forming step, by controlling the process parameters, the ratio of the molten pool height to the molten pool overlap rate is less than 1.9 mm, and the ratio of the molten pool width to the molten pool overlap rate is less than 1.4 μm. The microstructure of the deposited additive manufacturing high-temperature alloy printed part includes columnar crystals that grow at an angle of 15-35° to the construction direction.

2. The method for preparing additively manufactured high-temperature alloy printed parts according to claim 1, characterized in that, The particle size of the high-temperature alloy powder is 15~53μm.

3. The method for preparing additively manufactured high-temperature alloy printed parts according to claim 1, characterized in that, Before performing the laser selective melting and forming step, the high-temperature alloy needs to be vacuum dried.

4. The method for preparing additively manufactured high-temperature alloy printed parts according to claim 3, characterized in that, The temperature for vacuum drying is 150~200℃ and the time for vacuum drying is 3~5h.

5. The method for preparing additively manufactured high-temperature alloy printed parts according to claim 1, characterized in that, Before performing laser selective melting and forming on high-temperature alloy powder, a first layer of high-temperature alloy powder needs to be laid on the forming platform inside the forming chamber of the laser selective melting and forming equipment. Then, the laser selective melting and forming equipment is purged. After the oxygen content in the forming chamber drops to the preset level of 40ppm, the forming chamber is preheated to reach the preset temperature of 100~200℃.

6. The method for preparing additively manufactured high-temperature alloy printed parts according to claim 5, characterized in that, The thickness of the first layer of high-temperature alloy powder is 30~50μm.

7. The method for preparing additively manufactured high-temperature alloy printed parts according to claim 1, characterized in that, Before laser selective melting forming, the model needs to be modified, allowances added, placement orientation selected, supports added, parameters set, and model segmented according to the required printed parts, and the corresponding process documents are output to the laser selective melting forming equipment.

8. The method for preparing additively manufactured high-temperature alloy printed parts according to claim 1, characterized in that, If the alloy system for additive manufacturing of high-temperature alloy printed parts is ZGH451 alloy system, then the bulk energy density must be lower than 166 J / mm² during the laser selective melting forming process. 3 .

9. The method for preparing additively manufactured high-temperature alloy printed parts according to claim 1, characterized in that, If the alloy system for additive manufacturing of high-temperature alloy printed parts is GH4169 alloy system, then the bulk energy density must be lower than 288 J / mm² during the laser selective melting forming process. 3 .

10. The method for preparing additively manufactured high-temperature alloy printed parts according to claim 1, characterized in that, During the laser selective melting and forming process: For each printed part of a set height segment, laser remelting printing is performed on the printed part to remove impurities.

11. The method for preparing additively manufactured high-temperature alloy printed parts according to claim 10, characterized in that, The laser power of the laser remelting printing process is 190~200W, the scanning spacing is 0.05~0.06mm, the scanning rate is 1000~1100mm / s, and the spot diameter is 150~180μm.

12. The method for preparing additively manufactured high-temperature alloy printed parts according to claim 10, characterized in that, If the alloy system of the additive manufacturing high-temperature alloy printed part is ZGH451 alloy system, then the volume energy density of the laser remelting printing process is not higher than 115 J / mm². 3 .

13. The method for preparing additively manufactured high-temperature alloy printed parts according to claim 10, characterized in that, If the alloy system of the additively manufactured high-temperature alloy printed part is GH4169 alloy system, then the volume energy density of the laser remelting printing process is not higher than 133.3 J / mm². 3 .

14. The method for preparing additively manufactured high-temperature alloy printed parts according to claim 10, characterized in that, In the modeling software, the model for laser remelting printing must be set to overlap with the forming model to ensure that the same layer of remelting laser does not shift during the printing process.

15. The method for preparing additively manufactured high-temperature alloy printed parts according to claim 1, characterized in that, The method for preparing additively manufactured high-temperature alloy printed parts further includes: Stress relief treatment step: The deposited additive manufacturing high-temperature alloy printed part is subjected to stress relief treatment to obtain the stress-relieved additive manufacturing high-temperature alloy printed part.

16. The method for preparing additively manufactured high-temperature alloy printed parts according to claim 15, characterized in that, In the stress relief process: the vacuum furnace is evacuated, and the printed part is heated to 750-800℃ in the vacuum furnace and kept at that temperature for 3-5 hours. After the heat treatment is completed, the part is cooled to obtain the stress-relieved printed part.

17. The method for preparing additively manufactured high-temperature alloy printed parts according to claim 16, characterized in that, The heating rate for heating the printed part to 750-800℃ is 2~5℃ / min.

18. The method for preparing additively manufactured high-temperature alloy printed parts according to claim 16, characterized in that, The cooling method is furnace-in-flight cooling.

19. The method for preparing additively manufactured high-temperature alloy printed parts according to claim 15, characterized in that, Following the stress relief treatment step, the process further includes: Hot isostatic pressing (HOP) step: The stress-relieved additive high-temperature alloy printed part is heated to 1100~1200℃ and pressurized to 150~180MPa for hot isostatic pressing for 2~4 hours. After cooling, the heat-treated additive high-temperature alloy printed part is obtained.

20. The method for preparing additively manufactured high-temperature alloy printed parts according to claim 19, characterized in that, In the hot isostatic pressing step, the heating rate of the stress-relieved additive manufacturing high-temperature alloy printed part to 1100~1200℃ is 10~20k / min.

21. The method for preparing additively manufactured high-temperature alloy printed parts according to claim 20, characterized in that, In the hot isostatic pressing step, the cooling rate is 30~40k / min.

22. The method for preparing additively manufactured high-temperature alloy printed parts according to claim 1, characterized in that, If the alloy system of the additively manufactured high-temperature alloy printed part is the ZGH451 alloy system, then the additively manufactured high-temperature alloy printed part comprises the following chemical composition by weight percentage: Al 4~5wt%, B 0.015~0.020wt%, C 0.05~0.08wt%, Co 7~9wt%, Cr 7~9wt%, Mo 1.5~2.5wt%, Ta 5~7wt%, Ti 1~2wt%, W 7~9wt%, balance Ni.

23. The method for preparing additively manufactured high-temperature alloy printed parts according to claim 1, characterized in that, If the alloy system of the additively manufactured high-temperature alloy printed part is the GH4169 alloy system, then the additively manufactured high-temperature alloy printed part comprises the following chemical components by weight percentage: C≤0.08wt%, Cr 17.0~21.0wt%, Ni 50~55wt%, Co≤1.00wt%, Mo 2.8~3.30wt%, Al 0.20~0.8wt%, Ti 0.65~1.15wt%, Nb 4.75~5.50wt%, B≤0.006wt%, Mn≤0.35wt%, Si≤0.35wt%, S≤0.015wt%, Cu≤0.30wt%, P≤0.015wt%, Fe is the balance.

24. A high-temperature alloy printed part manufactured by additive manufacturing, characterized in that, The microstructure of the additively manufactured high-temperature alloy printed part has columnar crystals that grow at an angle of 15-35° to the construction direction; the additively manufactured high-temperature alloy printed part is obtained by the preparation method of the additively manufactured high-temperature alloy printed part according to any one of claims 1-23.

25. The additive manufacturing high-temperature alloy printed part according to claim 24, characterized in that, The additively manufactured high-temperature alloy printed part has no cracks or pores inside its structure.

26. The additive manufacturing high-temperature alloy printed part according to claim 24, characterized in that, If the alloy system of the additively manufactured high-temperature alloy printed part is ZGH451 alloy system, at room temperature, the σb of the heat-treated additively manufactured high-temperature alloy part is ≥991MPa, σ0.2 is ≥772MPa, and A is ≥16.5%; at a temperature of 1000℃±5℃, the σb of the heat-treated additively manufactured nickel-based high-temperature alloy is ≥405MPa, σ0.2 is ≥308MPa, and A is ≥17%.

27. The additive manufacturing high-temperature alloy printed part according to claim 24, characterized in that, If the alloy system of the additively manufactured high-temperature alloy printed part is GH4169 alloy system, at room temperature, the σb of the heat-treated additively manufactured high-temperature alloy part is ≥900MPa, σ0.2 is ≥500MPa, and A is ≥16%; at a temperature of 650℃±5℃, the σb of the heat-treated additively manufactured nickel-based high-temperature alloy is ≥650MPa, σ0.2 is ≥300MPa, and A is ≥12%.

28. The additive manufacturing high-temperature alloy printed part according to claim 24, characterized in that, The additively manufactured high-temperature alloy printed part is a turbine blade.

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