Additive manufacturing high-temperature alloy printing piece and preparation method thereof

Abstract

The invention relates to an additive manufacturing high-temperature alloy printing piece and a preparation method thereof, and relates to the technical field of additive manufacturing. According to the main technical scheme, the preparation method of the additive manufacturing high-temperature alloy printing piece comprises the following steps that selective laser melting forming treatment is conducted on high-temperature alloy powder, and a sedimentary state additive manufacturing high-temperature alloy printing piece is obtained; wherein the technological parameters of the selective laser melting forming treatment are set as follows: the laser power is 220 to 260 W, the scanning interval is 0.03 to 0.05 mm, the scanning rate is 1000 to 1100 mm / s, the layer thickness is 30 to 50 [mu] m, and the light spot diameter is 150 to 180 [mu] m. The method is mainly used for preparing the additive manufacturing high-temperature alloy printing piece with the obliquely-grown columnar crystals.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and in particular to an additively manufactured high-temperature alloy printed part and a preparation method thereof. Background Art

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

[0003] Usually, in order to meet the requirements of high temperature mechanics or long-term service, turbine blades need to be printed into hollow structures with single crystal or directional solidification structures inside. However, vertically printed turbine blades usually require a large number of internal support structures to meet the formability of turbine blade printing. However, these internal supports cannot be removed after the turbine blades are formed, thereby destroying the original structure of the turbine blades.

[0004] In order to minimize the additional internal support of the hollow turbine blades, the turbine blades need to be printed at a certain angle. However, during the laser selective melting process, there is a mismatch between the directional solidification structure direction of the tilted printed hollow turbine blades and the force direction of the blades. Here, the tilted columnar crystals can match the tilted printed hollow turbine blades to meet the mechanical performance requirements.

[0005] In summary, how to achieve inclined 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 additively manufactured high-temperature alloy print and a preparation method thereof, the main purpose of which is to prepare an additively manufactured high-temperature alloy print with inclined growth columnar crystals.

[0007] In order to achieve the above object, the present invention mainly provides the following technical solutions:

[0008] On the one hand, an embodiment of the present invention provides a method for preparing a high-temperature alloy printed part by additive manufacturing, which comprises the following steps:

[0009] Laser selective melting forming step: performing laser selective melting forming treatment on the high temperature alloy powder to obtain a deposition state additive manufacturing high temperature alloy print;

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

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

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

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

[0014] Preferably, before subjecting the high-temperature alloy powder to laser selective melting forming, a first layer of high-temperature alloy powder is laid on a forming platform in a forming chamber of the laser selective melting forming equipment, and then the laser selective melting 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 to 200°C; preferably, the thickness of the first layer of high-temperature alloy powder is 30 to 50 μm.

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

[0016] Preferably, if the alloy system of the additively manufactured high-temperature alloy print is the ZGH451 alloy system, the volume energy density should be lower than 166 J / mm during the laser selective melting forming process. 3 .

[0017] Preferably, if the alloy system of the additively manufactured high-temperature alloy print is the GH4169 alloy system, the volume energy density should be lower than 288 J / mm during the laser selective melting process. 3 .

[0018] Preferably, the microstructure of the deposited additively manufactured high-temperature alloy print comprises columnar crystals that grow at an angle of 15 to 35 degrees to the building direction.

[0019] Preferably, during the laser selective melting forming step: each time a print of a set height segment is formed, the print is subjected to laser remelting printing treatment to remove impurities of the print; preferably, the laser power of the laser remelting printing treatment is 190-200W, the scanning interval 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 additively manufactured high-temperature alloy print is the ZGH451 alloy system, the volume energy density of the laser remelting printing treatment is not higher than 115J / mm 3 Preferably, if the alloy system of the additively manufactured high-temperature alloy print is the GH4169 alloy system, the volume energy density of the laser remelting printing process is not higher than 133.3 J / mm 3 Preferably, the model processed by laser remelting printing should be set to overlap with the molding model in the modeling software to ensure that the remelting laser of the same layer is not offset during the printing process.

[0020] Preferably, the method for preparing a high-temperature alloy printed part by additive manufacturing further includes:

[0021] Stress relief treatment step: performing stress relief treatment on the deposited additively manufactured high-temperature alloy print to obtain the additively manufactured high-temperature alloy print after stress relief treatment;

[0022] Preferably, in the step of stress relief treatment: the vacuum furnace is evacuated, and the printed part is heated to 750-800°C in the vacuum furnace, kept warm for 3-5 hours, and after the insulation is completed, cooled to obtain the printed part after stress relief treatment; further preferably, the heating rate of heating the printed part to 750-800°C is 2-5°C / min; further preferably, the cooling method is furnace cooling.

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

[0024] Hot isostatic pressing step: heating the additively manufactured high-temperature alloy printed part after the stress relief treatment to 1100-1200° C., pressurizing to 150-180 MPa, and performing hot isostatic pressing for 2-4 hours, and obtaining a heat-treated additively manufactured high-temperature alloy printed part after cooling;

[0025] Preferably, in the step of hot isostatic pressing, the additively manufactured high-temperature alloy print after stress relief is heated to 1100-1200° C. at a heating rate of 10-20 k / min;

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

[0027] Preferably, if the alloy system of the additively manufactured high-temperature alloy print is a ZGH451 alloy system, the additively manufactured high-temperature alloy print comprises the following chemical composition in 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%, and the balance is Ni;

[0028] Preferably, if the alloy system of the additively manufactured high-temperature alloy print is the GH4169 alloy system, the additively manufactured high-temperature alloy print comprises the following chemical components in terms of weight percentage:

[0029] C≤0.08wt%, Cr 17.0~21.0wt%, Ni 50~55wt%, Co≤1.00wt%, Mo2.8~3.30wt%, 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%, and Fe is the balance.

[0030] On the other hand, an embodiment of the present invention provides an additively manufactured high-temperature alloy print, wherein the microstructure of the additively manufactured high-temperature alloy print has columnar crystals that grow at an angle of 15 to 35 degrees to the construction direction; preferably, there are no cracks or pores inside the structure of the additively manufactured high-temperature alloy print; preferably, if the alloy system of the additively manufactured high-temperature alloy print is a ZGH451 alloy system, at room temperature, the σb of the heat-treated additively manufactured high-temperature alloy part is ≥991MPa, σ0.2 ≥772MPa, and A ≥16.5%; at a temperature of 1000°C±5°C, the σb of the heat-treated additively manufactured nickel-based high-temperature alloy is ≥405MPa , σ0.2≥308MPa, A≥17%; preferably, if the alloy system of the additively manufactured high-temperature alloy print 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%; preferably, the additively manufactured high-temperature alloy print is obtained by the preparation method of the additively manufactured high-temperature alloy print described in any one of the above items; preferably, the additively manufactured high-temperature alloy print is a turbine blade.

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

[0032] On the one hand, an embodiment of the present invention provides a method for preparing an additively manufactured high-temperature alloy print, comprising the following steps: performing laser selective melting forming treatment on a high-temperature alloy powder to obtain a deposited additively manufactured high-temperature alloy print. Among them, the process parameters of the laser selective melting forming treatment 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. It should be noted here that when the laser power is 220-260w, the curvature of the bottom of the molten pool is relatively gentle. When the scanning spacing is 0.03-0.05mm, the molten pool can be remelted to a large extent, so that the cell structure on one side can always grow epitaxially, and then evolve into tilted grains (the scanning spacing determines whether the columnar crystal is tilted, and the power has the most significant effect on the morphology of the molten pool, so the power determines the tilt angle). Therefore, here, the embodiment of the present invention can successfully prepare an additively manufactured high-temperature alloy print with inclined growth columnar crystals by setting the process parameters of the laser selective melting forming process to the above range. In addition, the molten pool size (curvature of the bottom of the molten pool) determines the inclination angle, and the molten pool size is jointly determined by all the above process parameters. In the microstructure of the deposited additively manufactured high-temperature alloy print: the inclination angle of the columnar crystal 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, 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, the inclined growth of the columnar crystal can be achieved; preferably, the inclination angle of the columnar crystal 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, an embodiment of the present invention provides a method for preparing a high-temperature alloy print by additive manufacturing. In the process of laser selective melting forming: each time a print of a set height segment is formed, the print is subjected to laser remelting printing treatment to remove the impurities of the print; wherein the laser power of the laser remelting printing treatment is 190-200W, the scanning interval is 0.05-0.06mm, the scanning rate is 1000-1100mm / s, and the spot diameter is 150-180μm. Here, by adding a laser remelting printing treatment step and setting corresponding parameters, the impurities of the print can be well removed (after laser remelting, the number of impurities is significantly reduced, and the remelting molten pool line is clearly layered). Laser remelting can also increase the input of body energy density, reduce the cooling rate, and improve the epitaxial growth ability.

[0034] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiments of the present invention in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is the inclined columnar crystal EBSD image of the ZGH451 high temperature alloy print made by deposition additive manufacturing in Example 1;

[0036] Figure 2 is the inclined columnar crystal microstructure diagram of the ZGH451 high temperature alloy print made by additive manufacturing in the heat treatment state in Example 1;

[0037] Figure 3 is the inclined columnar crystal EBSD image of the GH4169 high temperature alloy print made by deposition additive manufacturing in Example 2;

[0038] Figure 4 This is the inclined columnar crystal EBSD image of the GH4169 high-temperature alloy print made by deposition additive manufacturing in Example 3.

[0039] Figure 5 is the inclined columnar crystal EBSD image of the ZGH451 high temperature alloy print made by deposition additive manufacturing in Example 4;

[0040] Figure 6 EBSD image of the deposited additively manufactured high-temperature alloy print in Comparative Example 1;

[0041] Figure 7 It is a hollow blade with a completely unsupported interior and an inclined solidified structure printed in Example 5 of the present invention. DETAILED DESCRIPTION

[0042] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation methods, structures, features and effects of the present invention application are described in detail below in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures, or characteristics in one or more embodiments may be combined in any suitable form.

[0043] The technical problem solved by the present invention is: innovatively realizing the inclined growth solidification structure, solving the problem that the directional solidification structure direction of the inclined printed hollow blade does not match the force direction of the blade during the laser selective melting forming process, so that the inclined printed alloy has the same inclined growth solidification structure. Specifically, the scheme of the present invention is as follows:

[0044] On the one hand, an embodiment of the present invention provides a method for preparing a high-temperature alloy printed part by additive manufacturing, which comprises the following steps:

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

[0046] Laser selective melting forming step: subjecting the high-temperature alloy powder to laser selective melting forming to obtain a deposition-state additively manufactured high-temperature alloy print.

[0047] Among them, before the laser selective melting forming process: it is necessary to prepare the laser selective melting forming equipment, install the scraper and substrate of the laser selective melting forming equipment (wherein the scraper is a flexible scraper that can reduce the force of the powder laying process on the formed part of the workpiece), and check the condition of the laser selective melting forming equipment. Lay a layer of powder on the forming platform in the forming chamber, and the thickness of the first layer of powder laid is 30 to 50μm. Wash the laser selective melting forming equipment, and preheat the forming chamber after the oxygen content in the forming chamber of the laser selective melting forming equipment drops to the preset level of 40ppm, so that the forming chamber reaches the preset temperature of 100 to 200℃. The forming process can be started after the powder to be laid also reaches the preheating temperature.

[0048] Among them, the laser selective melting forming process of the high-temperature alloy powder includes the following steps: model modification of the printed part to be formed (it should be noted that for model modification, the previous layer forming process and the next layer remelting process can be set to overlap the two models, but the printing order is different), addition of excess, placement orientation selection, support addition, parameter setting and model segmentation, and output of the corresponding process file to the laser selective melting forming equipment. The laser selective melting forming process is carried out with the set process parameters until a complete print is formed. Among them, 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] The volume energy density is 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 additively manufactured high-temperature alloy print is the ZGH451 alloy system, then during the laser selective melting forming process, the volume energy density is set to be less than 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).

[0051] If the alloy system of the additively manufactured high-temperature alloy print is the GH4169 alloy system, the volume energy density must be lower than 288 J / mm during the laser selective melting process. 3 .

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

[0053] Among them, during the laser remelting printing process, the volume energy density must be lower than the volume energy density of the original printed alloy (laser selective melting forming process), so that the original inclined solidification structure can be retained and the impurities on the molten pool can be remelted.

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

[0055] Preferably, during the laser remelting printing process, the model processed by laser remelting printing should be set in the modeling software (SolidWorks) to coincide with the original model (molding model, i.e., the model used for laser selective melting), i.e., shift focus = 0, so that the remelting laser of the same layer can be kept without offset during the printing process.

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

[0057] Preferably, the method for preparing a high-temperature alloy printed part by additive manufacturing provided in an embodiment of the present invention further includes the following steps:

[0058] Stress relief treatment step: performing stress relief treatment on the deposited additively manufactured high-temperature alloy print to obtain the additively manufactured high-temperature alloy print after stress relief treatment;

[0059] Preferably, in the step of stress relief treatment: the vacuum furnace is evacuated, and the printed part is heated to 750-800°C in the vacuum furnace, kept warm for 3-5 hours, and after the insulation is completed, cooled to obtain the printed part after stress relief treatment; further preferably, the heating rate of heating the printed part to 750-800°C is 2-5°C / min; further preferably, the cooling method is furnace cooling.

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

[0061] Hot isostatic pressing step: heating the additively manufactured high-temperature alloy print after the stress relief treatment to 1100-1200° C., pressurizing to 150-180 MPa, and performing hot isostatic pressing for 2-4 hours, and obtaining a heat-treated additively manufactured high-temperature alloy print after cooling.

[0062] Preferably, in the hot isostatic pressing step, the additively manufactured high-temperature alloy print after stress relief treatment is heated to 1100-1200°C at a heating rate of 10-20K / min; preferably, in the hot isostatic pressing step, the cooling rate is 30-40K / min.

[0063] On the other hand, an embodiment of the present invention provides an additively manufactured high-temperature alloy print, wherein the microstructure of the additively manufactured high-temperature alloy print comprises columnar crystals that grow obliquely at a set angle to a build direction; the angle between the columnar crystals and the build direction is 20 to 40°; and there are no cracks or pores inside the structure of the additively manufactured high-temperature alloy print.

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

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

[0066] In addition, the alloy system of the present invention is a ZGH451 alloy system and a GH4169 alloy system. Here, the specific composition of the ZGH451 alloy system is (wt%): 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%, and the balance is Ni.

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

[0068] The present invention will be further described below by means of specific examples and comparative examples.

[0069] Example 1

[0070] This embodiment prepares an additively manufactured ZGH451 high-temperature alloy print having columnar crystals at 30° to the build direction, mainly comprising the following steps:

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

[0072] Screen high-performance high-temperature alloy powder with a particle size of 15 to 53 μm, dry it in a vacuum environment at 170°C for 4 hours, and then load it into the laser selective melting forming equipment for standby use. Check the water level of the equipment's water cooler to make sure it reaches the water level line. Next, check the temperature of the equipment's laser to make sure it works at room temperature.

[0073] 2) Equipment preparation and preheating;

[0074] A flexible scraper that can reduce the force of the powder spreading process on the formed part of the workpiece is used as a powder spreading scraper; before installing the flexible scraper, use a rigid scraper to measure the distance between the substrate and the scraper so that it is greater than 0.5mm, install the scraper and substrate and check the equipment condition, then start gas washing, and after the oxygen content in the forming chamber is lower than 40ppm, start preheating the forming chamber to make the forming environment reach 200℃, then lay a layer of 50μm powder on the forming platform, and the forming process can start after the laid powder reaches the preheating temperature.

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

[0076] The printed parts to be formed are subjected to model modification, margin addition, and placement orientation selection. The placement orientation of the printed sample can be 90°. The performance characterization part printing requires operations such as tilting the corresponding angle of the solidification structure, adding supports, setting parameters, and model segmentation. When setting the model, the sample molding model and the remelting model need to completely overlap. After that, the sample molding model is assigned printing process parameters and the remelting model is assigned remelting process parameters. Finally, the model and process parameters are imported into the laser selective melting equipment.

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

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

[0079] 4) After the equipment cools down, take out the printed part, and then perform operations such as powder cleaning to obtain the required printed part. After taking out the printed part, put the printed part with the substrate directly into a vacuum furnace, heat it to 800℃ at a heating rate of 5℃ / min, and keep it warm for 5h to relieve stress; after the insulation is completed, cool it with the furnace to obtain the printed part after stress relief treatment.

[0080] Subsequently, the stress-relieved prints were subjected to subsequent operations such as cutting off the substrate and removing the support. Finally, they were placed in a hot isostatic pressing furnace for hot isostatic pressing (where the hot isostatic pressing temperature was 1200°C, the pressure was 180 MPa, and the time was 4 hours) to remove tiny defects and prepare for subsequent mechanical properties testing.

[0081] Figure 1 is the inclined columnar crystal EBSD image of the deposited additively manufactured high-temperature alloy print in Example 1; Figure 2 is the inclined columnar crystal microstructure diagram of the heat-treated additively manufactured high-temperature alloy print in Example 1. Figure 1 and Figure 2It can be seen that the columnar crystal phase is tilted relative to the printing direction (building direction) with an inclination angle of 30°. In addition, 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 prints prepared in this embodiment are as follows: at room temperature, σb=1390MPa, σ0.2=772MPa, A=22%; at a temperature of 1000°C, σb=405MPa, σ0.2=308MPa, A=33%.

[0083] Example 2

[0084] This embodiment prepares an additively manufactured GH4169 high-temperature alloy print having columnar crystals at 30° to the build direction, mainly comprising the following steps:

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

[0086] Screen high-performance high-temperature alloy powder with a particle size of 15 to 53 μm, dry it in a vacuum environment at 190°C for 3.5 hours, and then load it into the laser selective melting forming equipment for standby use. Check the water level of the equipment's water cooler to make sure it reaches the water level line. Next, check the temperature of the equipment's laser to make sure it works at room temperature.

[0087] 2) Equipment preparation and preheating;

[0088] A flexible scraper that can reduce the force of the powder spreading process on the formed part of the workpiece is used as a powder spreading scraper; before installing the flexible scraper, use a rigid scraper to measure the distance between the substrate and the scraper so that it is greater than 0.5mm, install the scraper and substrate and check the equipment condition, then start gas washing, and after the oxygen content in the forming chamber is lower than 40ppm, start preheating the forming chamber to make the forming environment reach 150℃, then lay a layer of 40μm powder on the forming platform, and the forming process can start after the laid powder reaches the preheating temperature.

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

[0090] The printed parts to be formed are subjected to model modification, margin addition, and placement orientation selection. The placement orientation of the printed sample can be 90°. The performance characterization part printing requires operations such as tilting the corresponding angle of the solidification structure, adding supports, setting parameters, and model segmentation. When setting the model, the sample molding model and the remelting model need to completely overlap. After that, the sample molding model is assigned printing process parameters and the remelting model is assigned remelting process parameters. Finally, the model and process parameters are imported into the laser selective melting equipment.

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

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

[0093] 4) After the equipment cools down, take out the printed part, and then perform operations such as cleaning powder to obtain the required printed part. After taking out the printed part, put the printed part with the substrate directly into a vacuum furnace, heat it to 800℃ at a heating rate of 3℃ / min, and keep it warm for 4h to relieve stress; after the insulation is completed, cool it with the furnace to obtain the printed part after stress relief treatment.

[0094] Subsequently, the stress-relieved prints were subjected to subsequent operations such as cutting off the substrate and removing the support. Finally, they were placed in a hot isostatic pressing furnace for hot isostatic pressing (where the hot isostatic pressing temperature was 1200°C, the pressure was 180 MPa, and the time was 4 hours) to remove tiny defects and prepare for subsequent mechanical properties testing.

[0095] Figure 3 is the inclined columnar crystal EBSD image of the deposited additively manufactured high-temperature alloy print in Example 2; Figure 3 It can be seen that the columnar crystal phase is tilted relative to the printing direction (building direction) at an angle of 30°. It should be noted here that: since the alloy composition of Example 2 is different from that of Example 1, although the printing parameters such as power are different, the molten pool height / molten pool overlap rate and the molten pool width / molten pool overlap rate are similar, so the final solidification structure has a similar inclination angle. In addition, the molten pool depth is 0.89 mm, the molten pool width is 1.4 μm, the overlap rate is 1.1, the molten pool depth / overlap rate is 0.80 mm, and the molten pool width / overlap rate is 1.27 μm.

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

[0097] Example 3

[0098] This embodiment prepares an additively manufactured GH4169 high-temperature alloy print having columnar crystals at 15° to the build direction, mainly comprising the following steps:

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

[0100] Screen high-performance high-temperature alloy powder with a particle size of 15 to 53 μm, dry it in a vacuum environment at 150°C for 3 hours, and then load it into the laser selective melting forming equipment for standby use. Check the water level of the equipment's water cooler to make sure it reaches the water level line. Next, check the temperature of the equipment's laser to make sure it works at room temperature.

[0101] 2) Equipment preparation and preheating;

[0102] A flexible scraper that can reduce the force of the powder spreading process on the formed part of the workpiece is used as a powder spreading scraper; before installing the flexible scraper, use a rigid scraper to measure the distance between the substrate and the scraper so that it is greater than 0.5mm, install the scraper and substrate and check the equipment condition, then start gas washing, and after the oxygen content in the forming chamber is lower than 40ppm, start preheating the forming chamber to make the forming environment reach 100℃, then lay a layer of 30μm powder on the forming platform, and the forming process can start after the laid powder reaches the preheating temperature.

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

[0104] The printed parts to be formed are subjected to model modification, margin addition, and placement orientation selection. The placement orientation of the printed sample can be 90°. The performance characterization part printing requires operations such as tilting the corresponding angle of the solidification structure, adding supports, setting parameters, and model segmentation. When setting the model, the sample molding model and the remelting model need to completely overlap. After that, the sample molding model is assigned printing process parameters and the remelting model is assigned remelting process parameters. Finally, the model and process parameters are imported into the laser selective melting equipment.

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

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

[0107] 4) After the equipment cools down, take out the printed part, and then perform operations such as powder cleaning to obtain the required printed part. After taking out the printed part, put the printed part with the substrate directly into a vacuum furnace, heat it to 750℃ at a heating rate of 2℃ / min, and keep it warm for 3h to relieve stress; after the insulation is completed, cool it with the furnace to obtain the printed part after stress relief treatment.

[0108] Subsequently, the stress-relieved prints were subjected to subsequent operations such as cutting off the substrate and removing the support. Finally, they were placed in a hot isostatic pressing furnace for hot isostatic pressing (where the hot isostatic pressing temperature was 1100°C, the pressure was 150 MPa, and the time was 2 hours) to remove tiny defects and prepare for subsequent mechanical property testing.

[0109] Figure 4 is the inclined columnar crystal EBSD image of the deposited additively manufactured high-temperature alloy print in Example 3; Figure 4 It can be seen that the columnar crystal phase is tilted relative to the printing direction (building direction) with an inclination angle of 15°. In addition, 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 prints prepared in this embodiment are as follows: at room temperature, σb=980MPa, σ0.2=540MPa, A=20%; at a temperature of 650°C, σb=780MPa, σ0.2=380MPa, A=16%.

[0111] Example 4

[0112] This embodiment prepares an additively manufactured ZGH451 high-temperature alloy print having columnar crystals at 30° to the build direction, mainly comprising the following steps:

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

[0114] Screen high-performance high-temperature alloy powder with a particle size of 15 to 53 μm, dry it in a vacuum environment at 170°C for 4 hours, and then load it into the laser selective melting forming equipment for standby use. Check the water level of the equipment's water cooler to make sure it reaches the water level line. Next, check the temperature of the equipment's laser to make sure it works at room temperature.

[0115] 2) Equipment preparation and preheating;

[0116] A flexible scraper that can reduce the force of the powder spreading process on the formed part of the workpiece is used as a powder spreading scraper; before installing the flexible scraper, use a rigid scraper to measure the distance between the substrate and the scraper so that it is greater than 0.5mm, install the scraper and substrate and check the equipment condition, then start gas washing, and after the oxygen content in the forming chamber is lower than 40ppm, start preheating the forming chamber to make the forming environment reach 200℃, then lay a layer of 50μm powder on the forming platform, and the forming process can start after the laid powder reaches the preheating temperature.

[0117] 3) Laser selective melting forming process:

[0118] The printed parts to be formed are subjected to model modification, margin addition, and placement orientation selection. The placement orientation of the printed sample can be 90°. The performance characterization part printing requires operations such as tilting the corresponding angle of the solidification structure, adding supports, setting parameters, and model segmentation. When setting the model, the sample molding model and the remelting model need to completely overlap. After that, the sample molding model is assigned printing process parameters and the remelting model is assigned remelting process parameters. Finally, the model and process parameters are imported into the laser selective melting equipment.

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

[0120] 4) After the equipment cools down, take out the printed part, and then perform operations such as powder cleaning to obtain the required printed part. After taking out the printed part, put the printed part with the substrate directly into a vacuum furnace, heat it to 800℃ at a heating rate of 5℃ / min, and keep it warm for 5h to relieve stress; after the insulation is completed, cool it with the furnace to obtain the printed part after stress relief treatment.

[0121] Subsequently, the stress-relieved prints were subjected to subsequent operations such as cutting off the substrate and removing the support. Finally, they were placed in a hot isostatic pressing furnace for hot isostatic pressing (where the hot isostatic pressing temperature was 1200°C, the pressure was 180 MPa, and the time was 4 hours) to remove tiny defects and prepare for subsequent mechanical properties testing.

[0122] Figure 5 This is the EBSD image of the tilted columnar crystal of the additively manufactured high-temperature alloy print in the deposited state in Example 4; it can be seen that the columnar crystal is tilted relative to the printing direction (building direction) with an inclination angle of 30°. However, compared with Example 1, the number of miscellaneous crystals in the structure without the remelting process is relatively large. In addition, the molten pool depth is 0.75 mm, the molten pool width is 1.1 μm, the overlap ratio is 0.9, the molten pool depth / overlap ratio is 0.83 mm, and the molten pool width / overlap ratio is 1.22 μm.

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

[0124] Comparative Example 1

[0125] Comparative Example 1: Preparing an additively manufactured high-temperature alloy print, mainly comprising the following steps:

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

[0127] Screen high-performance high-temperature alloy powder with a particle size of 15 to 53 μm, dry it in a vacuum environment at 160°C for 4 hours, and then load it into the laser selective melting forming equipment for standby use. Check the water level of the equipment's water cooler to make sure it reaches the water level line. Next, check the temperature of the equipment's laser to make sure it works at room temperature.

[0128] 2) Equipment preparation and preheating;

[0129] A flexible scraper that can reduce the force of the powder spreading process on the formed part of the workpiece is used as a powder spreading scraper; before installing the flexible scraper, use a rigid scraper to measure the distance between the substrate and the scraper so that it is greater than 0.5mm, install the scraper and substrate and check the equipment condition, then start gas washing, and after the oxygen content in the forming chamber is lower than 40ppm, start preheating the forming chamber to make the forming environment reach 110℃, then lay a layer of 40μm powder on the forming platform, and the forming process can start after the laid powder reaches the preheating temperature.

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

[0131] The printed parts to be formed are subjected to model modification, margin addition, and placement orientation selection. The placement orientation of the tissue sample printing sample can be 90°. The performance characterization part printing requires operations such as tilting the corresponding angle of the solidified structure, adding supports, setting parameters, and model segmentation. When setting the model, the sample molding model and the remelting model need to completely overlap. After that, the sample molding model is assigned printing process parameters and the remelting model is assigned remelting process parameters. Finally, the model and process parameters are imported into the laser selective melting equipment.

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

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

[0134] The EBSD image of the deposited additive manufacturing high-temperature alloy print prepared in this comparative example is shown in Figure 6. Figure 6 It can be seen that when the laser selective melting forming processing parameters are not within the range specified by the present invention, the columnar grains do not tilt. The reason is that: due to the low laser power, the molten pool is too flat, and the cell crystal growth direction cannot be tilted vertically upward. Secondly, the scanning interval is too high, the molten pool remelting is too small, and the cell crystal growth direction on one side cannot grow epitaxially. In addition, the molten pool depth is 1.75mm, the molten pool width is 1.27μm, the overlap ratio is 0.85, the molten pool depth / overlap ratio is 2.05mm, and the molten pool width / overlap ratio is 1.49μm.

[0135] Example 5

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

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

[0138] Screen high-performance high-temperature alloy powder with a particle size of 15 to 53 μm, dry it in a vacuum environment at 170°C for 4 hours, and then load it into the laser selective melting forming equipment for standby use. Check the water level of the equipment's water cooler to make sure it reaches the water level line. Next, check the temperature of the equipment's laser to make sure it works at room temperature.

[0139] 2) Equipment preparation and preheating;

[0140] A flexible scraper that can reduce the force of the powder spreading process on the formed part of the workpiece is used as a powder spreading scraper; before installing the flexible scraper, use a rigid scraper to measure the distance between the substrate and the scraper so that it is greater than 0.5mm, install the scraper and substrate and check the equipment condition, then start gas washing, and after the oxygen content in the forming chamber is lower than 40ppm, start preheating the forming chamber to make the forming environment reach 200℃, then lay a layer of 50μm powder on the forming platform, and the forming process can start after the laid powder reaches the preheating temperature.

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

[0142] The blade model to be formed is derived from an existing mature model. The blade printing direction is placed at an angle of 30°, and operations such as support addition, parameter setting and model segmentation are performed on it. When setting the model, the sample forming model and the remelting model need to completely overlap. Then, the sample forming model is assigned printing process parameters and the remelting model is assigned remelting process parameters. Finally, the model and process parameters are imported into the laser selective melting equipment.

[0143] The processing parameters of laser selective melting 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 / mm 3 .

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

[0145] 4) After the equipment cools down, take out the printed part, and then perform operations such as powder cleaning to obtain the required printed part. After taking out the printed part, put the printed part with the substrate directly into a vacuum furnace, heat it to 800℃ at a heating rate of 5℃ / min, and keep it warm for 5h to relieve stress; after the insulation is completed, cool it with the furnace to obtain the printed part after stress relief treatment.

[0146] Subsequently, the stress-relieved prints were subjected to subsequent operations such as cutting off the substrate and removing the support. Finally, they were placed in a hot isostatic pressing furnace for hot isostatic pressing (where the hot isostatic pressing temperature was 1200°C, the pressure was 180 MPa, and the time was 4 hours) to remove tiny defects and prepare for subsequent mechanical properties testing.

[0147] Figure 7 This is the overall structure of the blade of the deposition-based additively manufactured high-temperature alloy print in Example 5, the hollow structure and the inclined columnar crystal EBSD map; it can be seen that: the columnar crystals have the same inclination angle along the printing direction (building direction), and the inclination 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, showing a complete air-cooling structure without internal support. Figure 7 Figure c shows the solidification structure inside the blade, showing columnar crystals with the same inclination angle as the blade.

[0149] In summary, the additive manufacturing high-temperature alloy print prepared in the embodiment of the present invention has inclined columnar crystals, few impurity crystals, and also has the advantages of high medium and high temperature strength and good plasticity at high temperature. Therefore, the preparation process in the embodiment of the present invention has broad application prospects.

[0150] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification, equivalent change and modification made to the above embodiment according to the technical essence of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A method for preparing a high-temperature alloy print by additive manufacturing, characterized in that: It includes the following steps: Laser selective melting forming step: performing laser selective melting forming treatment on the high temperature alloy powder to obtain a deposition state additive manufacturing high temperature alloy print; The process parameters of the laser selective melting process are set as follows: The laser power is 220-260 W, the scanning interval is 0.03-0.05 mm, the scanning rate is 1000-1100 mm / s, the layer thickness is 30-50 μm, and the spot diameter is 150-180 μm.

2. The method for preparing a high-temperature alloy printed part by additive manufacturing according to claim 1, characterized in that: In the laser selective melting forming step, by controlling the process parameters, the ratio of the molten pool height to the molten pool overlap ratio is less than 1.9 mm, and the ratio of the molten pool width to the molten pool overlap ratio is less than 1.4 μm.

3. The method for preparing a high-temperature alloy printed part by additive manufacturing according to claim 1 or 2, characterized in that: The particle size of the high temperature alloy powder is 15 to 53 μm; and / or Before the laser selective melting forming step, the high temperature alloy needs to be vacuum dried; preferably, the vacuum drying temperature is 150-200° C. and the vacuum drying time is 3-5 hours.

4. The method for preparing a high-temperature alloy printed part by additive manufacturing according to any one of claims 1 to 3, characterized in that: Before the high-temperature alloy powder is subjected to laser selective melting forming, a first layer of high-temperature alloy powder is laid on a forming platform in a forming chamber of the laser selective melting forming equipment, and then the laser selective melting 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 to 200° C. Preferably, the thickness of the first layer of high-temperature alloy powder is 30 to 50 μm; and / or Before the laser selective melting process, the model needs to be modified, the allowance added, the placement selected, the support added, the parameters set, and the model segmented according to the required print parts, and the corresponding process files need to be output to the laser selective melting equipment; and / or If the alloy system of the additively manufactured high-temperature alloy print is the ZGH451 alloy system, the volume energy density must be lower than 166 J / mm during the laser selective melting process. 3 ; and / or If the alloy system of the additively manufactured high-temperature alloy print is the GH4169 alloy system, the volume energy density must be lower than 288 J / mm during the laser selective melting process. 3 .

5. The method for preparing a high-temperature alloy printed part by additive manufacturing according to any one of claims 1 to 4, characterized in that: The microstructure of the deposited additively manufactured high-temperature alloy print comprises columnar crystals that grow at an angle of 15 to 35 degrees to the building direction.

6. The method for preparing a high-temperature alloy printed part by additive manufacturing according to any one of claims 1 to 5, characterized in that: 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 processing to remove impurities in the printed part; Preferably, the laser power of the laser remelting printing process is 190-200W, the scanning interval 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 additively manufactured high-temperature alloy print is the ZGH451 alloy system, the volume energy density of the laser remelting printing process is not higher than 115 J / mm 3 ; Preferably, if the alloy system of the additively manufactured high-temperature alloy print is the GH4169 alloy system, the volume energy density of the laser remelting printing process is not higher than 133.3 J / mm 3 ; Preferably, the model processed by laser remelting printing should be set in the modeling software to coincide with the molding model to ensure that the remelting laser of the same layer is not offset during the printing process.

7. The method for preparing a high-temperature alloy printed part by additive manufacturing according to any one of claims 1 to 6, characterized in that: The method for preparing a high-temperature alloy printed part by additive manufacturing further includes: Stress relief treatment step: performing stress relief treatment on the deposited additively manufactured high-temperature alloy print to obtain the additively manufactured high-temperature alloy print after stress relief treatment; Preferably, in the step of stress relief treatment: the vacuum furnace is evacuated, and the printed part is heated to 750-800°C in the vacuum furnace, kept warm for 3-5 hours, and after the insulation is completed, cooled to obtain the printed part after stress relief treatment; further preferably, the heating rate of heating the printed part to 750-800°C is 2-5°C / min; further preferably, the cooling method is furnace cooling.

8. The method for preparing a high-temperature alloy printed part by additive manufacturing according to claim 7, characterized in that: After the stress relief step, the method further comprises: Hot isostatic pressing step: heating the additively manufactured high-temperature alloy printed part after the stress relief treatment to 1100-1200° C., pressurizing to 150-180 MPa, and performing hot isostatic pressing for 2-4 hours, and obtaining a heat-treated additively manufactured high-temperature alloy printed part after cooling; Preferably, in the step of hot isostatic pressing, the additively manufactured high-temperature alloy print after stress relief is heated to 1100-1200° C. at a heating rate of 10-20 k / min; Preferably, in the hot isostatic pressing step, the cooling rate is 30 to 40 k / min.

9. The method for preparing a high-temperature alloy printed part by additive manufacturing according to any one of claims 1 to 7, characterized in that: If the alloy system of the additively manufactured high-temperature alloy print is the ZGH451 alloy system, the additively manufactured high-temperature alloy print includes the following chemical components in terms of weight percentage: Al 4-5wt%, B 0.015-0.020wt%, C 0.05-0.08wt%, Co 7-9wt%, Cr7-9wt%, Mo1.5-2.5wt%, Ta 5-7wt%, Ti 1-2wt%, W 7-9wt%, and the balance is Ni; If the alloy system of the additively manufactured high-temperature alloy print is the GH4169 alloy system, the additively manufactured high-temperature alloy print includes the following chemical components in terms of weight percentage: C≤0.08wt%, Cr 17.0~21.0wt%, Ni 50~55wt%, Co≤1.00wt%, Mo2.8~3.30wt%, 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%, and Fe is the balance.

10. An additively manufactured high-temperature alloy printed part, characterized in that: The microstructure of the additively manufactured high-temperature alloy print has columnar crystals that grow at an angle of 15 to 35 degrees to the building direction; Preferably, there are no cracks or pores in the structure of the additively manufactured high-temperature alloy print; Preferably, if the alloy system of the additively manufactured high-temperature alloy print is the ZGH451 alloy system, at room temperature, the heat-treated additively manufactured high-temperature alloy part has σb ≥ 991 MPa, σ0.2 ≥ 772 MPa, and A ≥ 16.5%; at a temperature of 1000°C ± 5°C, the heat-treated additively manufactured nickel-based high-temperature alloy has σb ≥ 405 MPa, σ0.2 ≥ 308 MPa, and A ≥ 17%; Preferably, if the alloy system of the additively manufactured high-temperature alloy print is the 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°C±5°C, the σb of the heat-treated additively manufactured nickel-based high-temperature alloy is ≥650MPa, σ0.2 is ≥300MPa, and A is ≥12%; Preferably, the additively manufactured high-temperature alloy printed part is obtained by the method for preparing the additively manufactured high-temperature alloy printed part according to any one of claims 1 to 9; Preferably, the additively manufactured high-temperature alloy printed part is a turbine blade.

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