阅读说明：本技术 镍基高温合金及其制备方法 (Nickel-based superalloy and preparation method thereof ) 是由 郭瑜 汪强兵 谭黎明 张莹 龙学湖 于 2021-09-29 设计创作，主要内容包括：本发明涉及一种本发明涉及新材料及先进制造技术领域,特别涉及镍基高温合金及其制备方法。所述镍基高温合金由以下重量百分比的组分组成：Co 22～28％、Cr 14～16％、W 2.5～3.5％、Mo 1.5～2.5％、Al 3.0～3.4％、Ti 1.8～2.2％、Ta 0.8～1.2％、Nb 1～2.2％、C不超过0.05％、B不超过0.01％、Si不超过0.5％和Ni余量。本发明通过组分设计,从成分改进的角度,改善了镍基高温合金在增材制造过程中易生孔洞、易开裂、成品率低的问题,使得镍基高温合金可以在较宽的3D打印工艺窗口中制备出高性能的高温合金部件,便于在工业上推广。(The invention relates to the technical field of new materials and advanced manufacturing, in particular to a nickel-based high-temperature alloy and a preparation method thereof. The nickel-based superalloy consists of the following components in percentage by weight: 22-28% of Co, 14-16% of Cr, 2.5-3.5% of W, 1.5-2.5% of Mo, 3.0-3.4% of Al, 1.8-2.2% of Ti, 0.8-1.2% of Ta, 1-2.2% of Nb, no more than 0.05% of C, no more than 0.01% of B, no more than 0.5% of Si and the balance of Ni. According to the invention, through component design, the problems of easy generation of holes, easy cracking and low yield of the nickel-based high-temperature alloy in the additive manufacturing process are solved from the aspect of component improvement, so that the nickel-based high-temperature alloy can be used for preparing high-performance high-temperature alloy parts in a wider 3D printing process window, and is convenient for industrial popularization.)

1. The nickel-based superalloy is characterized by comprising the following components in percentage by weight:

22-28% of Co, 14-16% of Cr, 2.5-3.5% of W, 1.5-2.5% of Mo, 3.0-3.4% of Al, 1.8-2.2% of Ti, 0.8-1.2% of Ta, 1-2.2% of Nb, no more than 0.05% of C, no more than 0.01% of B, no more than 0.5% of Si and the balance of Ni.

2. The nickel-base superalloy according to claim 1, comprising the following composition in weight percent:

22-28% of Co, 14-16% of Cr, 2.5-3.5% of W, 1.5-2.5% of Mo, 3.0-3.4% of Al, 1.8-2.2% of Ti, 0.8-1.2% of Ta, 1-2.2% of Nb, 0.001-0.05% of C, 0.001-0.01% of B, less than or equal to 0.5% of Si and the balance of Ni.

3. The nickel-base superalloy according to claim 2, comprising the following composition in weight percent:

24-27% of Co, 14-15% of Cr, 2.5-3% of W, 2-2.5% of Mo, 3.1-3.4% of Al, 1.8-2% of Ti, 1-1.2% of Ta, 1-2% of Nb, 0.001-0.05% of C, 0.005-0.01% of B, 0.001-0.5% of Si, and the balance of Ni.

4. The preparation method of the nickel-based superalloy is characterized by comprising the following steps:

taking simple substances of all components for smelting according to the weight percentage of any one of claims 1 to 3 to prepare an alloy part;

processing the alloy piece by adopting an atomization powder preparation method to prepare powder;

the powder is used as a main raw material, and a selective laser melting method or an electron beam melting method is adopted to prepare the nickel-based superalloy.

5. The method of claim 4, wherein the atomization milling process is an argon atomization process.

6. The method of claim 4, wherein the atomization milling process is a rotary electrode atomization process.

7. The method for the preparation of nickel-base superalloys according to claim 4 or 5, characterized in that the particle size D50 of the powder is between 30 and 40 μm.

8. The method for preparing the nickel-base superalloy as claimed in claim 6, wherein the process parameters of the selective laser melting method include: the preset temperature of the substrate is 100-200 ℃, the laser power is 200-400W, the thickness of the powder layer is 30-60 μm, the scanning speed is 700-1500 mm/s, and the scanning distance is 0.03-0.15 mm.

9. The method for the preparation of nickel-base superalloys according to claim 4 or 5, characterized in that the particle size D50 of the powder is between 60 and 100 μm.

10. The method of claim 9, wherein the process parameters of the electron beam melting method include: the preheating temperature of the substrate is 800-1000 ℃, the accelerating voltage is 50 kV-70 kV, the thickness of the powder layer is 50 μm-90 μm, the maximum current is 16 mA-20 mA, the scanning distance is 0.05 mm-0.20 mm, and the scanning speed is 5 m/s-8 m/s.

Technical Field

The invention relates to the technical field of new materials and advanced manufacturing, in particular to a nickel-based high-temperature alloy and a preparation method thereof.

Background

The nickel-based high-temperature alloy has excellent tensile strength, creep resistance, fatigue resistance and oxidation resistance within the temperature range of 540-1000 ℃, and is a necessary material for key high-temperature components in core components of aeroengines, gas turbines and the like.

The high-temperature alloy part with a complex structure and high performance can be produced by adopting a casting, deforming or powder metallurgy process. However, the high-temperature alloy part prepared by adopting the traditional casting, thermal deformation, powder metallurgy and other processes has the problems of long production flow, high technical control difficulty, more excess materials in subsequent processing, difficult processing and the like. Taking a traditional casting process as an example, to prepare a casting with standard size and performance, the casting needs to undergo complex processes of metal smelting, model manufacturing, pouring solidification, demolding, cleaning and the like, and improper operation in any link can cause the defects of cracking, substandard size and the like, so that the product is scrapped.

The additive manufacturing is a good supplement of the traditional manufacturing technology, has obvious advantages in preparing high-temperature alloy parts with complex structures, does not need a die, has simple production process, can realize automatic production, and has controllable process links. As an advanced manufacturing technology, additive manufacturing has been widely applied to the preparation of metal materials such as aluminum alloy, titanium alloy, steel, high temperature alloy, and the like. It has significant advantages in the manufacture of complex structures, customized components. When the material increase manufacturing of high temperature resistant products is carried out at home and abroad, several nickel-based commercial alloy powders which are widely used are mainly adopted, such as IN718, IN625, IN738LC and the like.

However, since the nickel-based superalloy has complex components and extremely high alloying degree, defects such as holes and cracks are easily generated IN the additive manufacturing process, and the formability is poor, for example, fig. 1 shows a scheme that IN738LC (formula shown IN table 1) is used as a raw material, and the surface morphology of the nickel-based superalloy prepared by Selective Laser Melting (SLM) is obviously visible, and the defects such as cracks and holes appear IN the product. This greatly limits the application of additive manufacturing techniques in the field of high temperature alloys.

Disclosure of Invention

Based on the above, the invention provides the nickel-based superalloy, which reduces the risks of holes and cracking of the nickel-based superalloy in the additive manufacturing process from the aspect of component improvement through component design, widens the process window of additive manufacturing of the nickel-based superalloy, and is convenient for industrial popularization.

The technical scheme is as follows:

a nickel-based superalloy consists of the following components in percentage by weight:

22-28% of Co, 14-16% of Cr, 2.5-3.5% of W, 1.5-2.5% of Mo, 3.0-3.4% of Al, 1.8-2.2% of Ti, 0.8-1.2% of Ta, 1-2.2% of Nb, no more than 0.05% of C, no more than 0.01% of B, no more than 0.5% of Si and the balance of Ni.

In one embodiment, the nickel-base superalloy consists of the following components in percentage by weight:

22-28% of Co, 14-16% of Cr, 2.5-3.5% of W, 1.5-2.5% of Mo, 3.0-3.4% of Al, 1.8-2.2% of Ti, 0.8-1.2% of Ta, 1-2.2% of Nb, 0.001-0.05% of C, 0.001-0.01% of B, less than or equal to 0.5% of Si and the balance of Ni.

In one embodiment, the nickel-base superalloy consists of the following components in percentage by weight:

24-27% of Co, 14-15% of Cr, 2.5-3% of W, 2-2.5% of Mo, 3.1-3.4% of Al, 1.8-2% of Ti, 1-1.2% of Ta, 1-2% of Nb, 0.001-0.05% of C, 0.005-0.01% of B, 0.001-0.5% of Si, and the balance of Ni.

The invention also provides a preparation method of the nickel-based superalloy.

The technical scheme is as follows:

a preparation method of a nickel-based superalloy comprises the following steps:

according to the weight percentage, the simple substances of all the components are smelted to prepare an alloy part;

processing the alloy piece by adopting an atomization powder preparation method to prepare powder;

the powder is used as a main raw material, and a selective laser melting method or an electron beam melting method is adopted to prepare the nickel-based superalloy.

In one embodiment, the atomization powder preparation method is an argon atomization method or a rotary electrode atomization method.

In one embodiment, the particle size D50 of the powder is between 30 μm and 40 μm.

In one embodiment, the process parameters of the selective laser melting method include: the preset temperature of the substrate is 100-200 ℃, the laser power is 200-400W, the thickness of the powder layer is 30-60 μm, the scanning speed is 700-1500 mm/s, and the scanning distance is 0.03-0.15 mm.

In one embodiment, the particle size D50 of the powder is between 60 μm and 100 μm.

In one embodiment, the process parameters of the electron beam melting method include: the preheating temperature of the substrate is 800-1000 ℃, the accelerating voltage is 50 kV-70 kV, the thickness of the powder layer is 50 μm-90 μm, the maximum current is 16 mA-20 mA, the scanning distance is 0.05 mm-0.20 mm, and the scanning speed is 5 m/s-8 m/s.

Compared with the prior art, the invention has the following beneficial effects:

the components of the nickel-based high-temperature alloy are improved, firstly, the thermal expansion coefficient of the alloy at high temperature is reduced by adjusting the content of Co, Al and other elements, and the internal stress of the alloy caused by severe thermal expansion and contraction in the additive manufacturing process is reduced; secondly, the sufficient anti-cracking capability of the alloy is ensured, meanwhile, the gamma' phase content is controlled to be 40% by adjusting the content of W, Mo and other solid solution strengthening elements and Al, Ti, Nb and other precipitation strengthening elements, so that the sufficient precipitation strengthening effect is achieved, and the sufficient toughness of the alloy is ensured by adopting the coordination of solid solution strengthening and precipitation strengthening; thirdly, other components and dosage are determined through thermodynamic calculation and component screening.

In order to reduce the risk of holes and cracks generated in the additive manufacturing process of the nickel-base superalloy. The invention researches a nickel-based high-temperature alloy which is suitable for additive manufacturing and has a wider process window from the aspect of component improvement, has the characteristics of good formability and excellent performance, and can be used for producing key high-temperature components such as high-temperature alloy blades, gas turbine casings, oil nozzles and the like by an additive manufacturing process. The invention improves the problems of easy generation of holes, easy cracking and low yield of the nickel-based high-temperature alloy in the additive manufacturing process, so that the nickel-based high-temperature alloy can be used for preparing high-performance high-temperature alloy parts in a wider 3D printing process window, and is convenient to popularize in industry.

Drawings

FIG. 1 is a graph of the localized surface topography of a nickel-base superalloy starting with IN738 LC;

FIG. 2 is a flow chart of a method of making a nickel-base superalloy;

FIG. 3 is a partial surface topography of the nickel-base superalloys prepared in examples 1 and 2.

Detailed Description

The present invention will be described in further detail with reference to specific examples. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.

Term(s) for

Unless otherwise stated or contradicted, terms or phrases used in the present invention have the following meanings:

as used herein, the term "and/or", "and/or" includes any one of two or more of the associated listed items, as well as any and all combinations of the associated listed items, including any two of the associated listed items, any more of the associated listed items, or all combinations of the associated listed items.

In the present invention, "one or more" means any one, any two or more of the listed items. Wherein, the 'several' means any two or more than any two.

In the present invention, the terms "combination thereof", "any combination thereof", and the like include all suitable combinations of any two or more of the listed items.

In the present invention, the term "suitable" in the "suitable combination," the "suitable mode," the "any suitable mode," and the like shall be taken to mean that the technical solution of the present invention can be implemented, the technical problem of the present invention can be solved, and the intended technical effect of the present invention can be achieved.

In the present invention, "preferred" is only an embodiment or an example for better description, and it should be understood that the scope of the present invention is not limited thereto.

In the present invention, the technical features described in the open type include a closed technical solution composed of the listed features, and also include an open technical solution including the listed features.

In the present invention, the numerical range is defined to include both end points of the numerical range unless otherwise specified.

The percentage contents referred to in the present invention mean, unless otherwise specified, mass percentages for solid-liquid mixing and solid-solid phase mixing, and volume percentages for liquid-liquid phase mixing.

In the present invention, the percentage concentrations are, unless otherwise specified, the final concentrations. The final concentration refers to the ratio of the additive component in the system to which the component is added.

In the present invention, the temperature parameter is not particularly limited, and may be a constant temperature treatment or a treatment within a certain temperature range. The constant temperature process allows the temperature to fluctuate within the accuracy of the instrument control.

Additive manufacturing: additive Manufacturing (AM), also known as "3D printing", is a Manufacturing technique in which a metal material, a non-metal material, and a medical biomaterial are stacked layer by layer in manners of extrusion, sintering, melting, photocuring, spraying, and the like to manufacture a solid object.

Selective laser melting: selective Laser Melting (SLM) is one of metal 3D printing technologies, and its working principle is: the computer converts the three-dimensional data of the object into 2D data of the cross section of each layer and transmits the data to the printer, in the printing process, metal powder with a set layer thickness is paved on the substrate by a scraper, focused laser is scanned under the control of a scanning galvanometer according to a preset planned path and process parameters, and the metal powder is melted and rapidly solidified under the irradiation of high-energy laser to form a metallurgical bonding layer. And after the printing task of one layer is finished, the substrate is lowered by the thickness of one slice layer, the scraper continues to perform powder paving and laser scanning processing, and the process is repeated until the printing of the whole part is finished.

Electron beam melting: electron Beam Melting (EBM) is a metal additive manufacturing technique that works similar to SLM, with the main difference that it uses a high energy Electron Beam to melt metal powder.

For example, fig. 1 shows a scheme that IN738LC (formula shown IN table 1) is used as a raw material, and a nickel-based superalloy additive manufactured product prepared by Selective Laser Melting (SLM) has a surface appearance which is obviously visible, and has defects such as cracks and holes. This greatly limits the application of additive manufacturing techniques in the field of high temperature alloys.

Based on the above, the invention provides the nickel-based superalloy, which reduces the risks of holes and cracking of the nickel-based superalloy in the additive manufacturing process from the aspect of component improvement through component design, widens the process window of additive manufacturing of the nickel-based superalloy, and is convenient for industrial popularization.

The technical scheme is as follows:

a nickel-based superalloy consists of the following components in percentage by weight:

the alloy comprises, by weight, 22-28% of Co, 14-16% of Cr, 2.5-3.5% of W, 1.5-2.5% of Mo1.5%, 3.0-3.4% of Al, 1.8-2.2% of Ti, 0.8-1.2% of Tab, 1.8-2.2% of Nbs, 0.05% or less of C, 0.01% or less of B, 0.5% or less of Si and the balance of Ni.

The components of the nickel-based high-temperature alloy are improved, firstly, the thermal expansion coefficient of the alloy at high temperature is reduced by adjusting the content of Co, Al and other elements, and the internal stress of the alloy caused by severe thermal expansion and contraction in the additive manufacturing process is reduced; secondly, the sufficient anti-cracking capability of the alloy is ensured, meanwhile, the gamma' phase content is controlled to be 40% by adjusting the content of W, Mo and other solid solution strengthening elements and Al, Ti, Nb and other precipitation strengthening elements, so that the sufficient precipitation strengthening effect is achieved, and the sufficient toughness of the alloy is ensured by adopting the coordination of solid solution strengthening and precipitation strengthening; thirdly, other components and dosage are determined through thermodynamic calculation and component screening.

In order to reduce the risk of holes and cracks generated in the additive manufacturing process of the nickel-base superalloy. The invention researches a nickel-based high-temperature alloy which is suitable for additive manufacturing and has a wider process window from the aspect of component improvement, has the characteristics of good formability and excellent performance, and can be used for producing key high-temperature components such as high-temperature alloy blades, gas turbine casings, oil nozzles and the like by an additive manufacturing process. The invention improves the problems of easy generation of holes, easy cracking and low yield of the nickel-based high-temperature alloy in the additive manufacturing process, so that the nickel-based high-temperature alloy can be used for preparing high-performance high-temperature alloy parts in a wider 3D printing process window, and is convenient to popularize in industry.

In a preferred embodiment, the nickel-base superalloy consists of the following components in percentage by weight:

22-28% of Co, 14-16% of Cr, 2.5-3.5% of W, 1.5-2.5% of Mo, 3.0-3.4% of Al, 1.8-2.2% of Ti, 0.8-1.2% of Ta, 1-2.2% of Nb, 0.001-0.05% of C, 0.001-0.01% of B, less than or equal to 0.5% of Si and the balance of Ni.

B. C and other elements have extremely strong interface segregation elements, the solid/liquid interface energy can be reduced, the low-melting-point liquid phase film is promoted to wrap around dendrites at the final stage of solidification, and the bonding strength between dendrites is reduced.

In a more preferred embodiment, the nickel-base superalloy consists of the following components in percentage by weight:

24-27% of Co, 14-15% of Cr, 2.5-3% of W, 2-2.5% of Mo, 3.1-3.4% of Al, 1.8-2% of Ti, 1-1.2% of Ta, 1-2% of Nb, 0.001-0.05% of C, 0.005-0.01% of B, 0.001-0.5% of Si, and the balance of Ni.

The addition of trace Si can improve the casting performance of the cast nickel-based high-temperature alloy and improve the weldability, the wear resistance, the oxidation resistance and the corrosion resistance of the cast nickel-based high-temperature alloy. According to the invention, the grain refinement in the solidification process is realized by adjusting the content of the Si element, so that the dual effects of crack resistance and grain boundary strengthening are achieved.

The invention also provides a preparation method of the nickel-based superalloy.

The technical scheme is as follows:

a method for preparing a nickel-base superalloy, see fig. 2, comprising the steps of:

according to the weight percentage, the simple substances of all the components are smelted to prepare an alloy part;

processing the alloy piece by adopting an atomization powder preparation method to prepare powder;

the powder is used as a main raw material, and a selective laser melting method or an electron beam melting method is adopted to prepare the nickel-based superalloy.

It will be appreciated that the composition of the alloy piece, the powder and the nickel-base superalloy does not substantially change during the preparation of the nickel-base superalloy, and in one embodiment, proportions of the composition of the alloy piece may be transferred to the powder and proportions of the composition of the powder may be transferred to the nickel-base superalloy.

In one embodiment, the atomization powder preparation method is an argon atomization method or a rotary electrode atomization method.

It will be appreciated that adjusting the method of preparation of the powder, which may be adjusted to a particle size, in one embodiment, the particle size D50 is between 30 μm and 40 μm, may allow additive manufacturing products to be prepared by a selective laser melting method.

In one embodiment, the process parameters of the selective laser melting method include: the preset temperature of the substrate is 100-200 ℃, the laser power is 200-400W, the thickness of the powder layer is 30-60 μm, the scanning speed is 700-1500 mm/s, and the scanning distance is 0.03-0.15 mm.

In one embodiment, the powder has a particle size D50 between 60 μm and 100 μm and an additive manufactured product may be prepared by an electron beam melting process.

In one embodiment, the process parameters of the electron beam melting method include: the preheating temperature of the substrate is 800-1000 ℃, the accelerating voltage is 50 kV-70 kV, the thickness of the powder layer is 50 μm-90 μm, the maximum current is 16 mA-20 mA, the scanning distance is 0.05 mm-0.20 mm, and the scanning speed is 5 m/s-8 m/s.

The preparation method of the nickel-based high-temperature alloy solves the problems that the nickel-based high-temperature alloy is easy to generate holes, crack and have low yield in the additive manufacturing process, so that the nickel-based high-temperature alloy can be used for preparing high-performance high-temperature alloy parts in a wider 3D printing process window, is convenient to popularize in industry, and has the technical advantages of high efficiency, short flow, low cost and the like.

It is understood that the step of preparing the nickel-base superalloy by the selective laser melting method or the electron beam melting method comprises: firstly, preparing a prefabricated product by a selective laser melting method or an electron beam melting method, and then carrying out heat treatment and subsequent processing on the prefabricated product to prepare the nickel-based superalloy.

The nickel-based high-temperature alloy prepared by the preparation method has the characteristics of good formability and excellent performance, can be used as key high-temperature components such as high-temperature alloy blades, gas turbine casings and oil nozzles, and can also be used as high-temperature alloy components in production of aeroengines and gas turbines.

The following examples and comparative examples are further described below, and the starting materials used in the following examples can be commercially available, unless otherwise specified, and the equipment used therein can be commercially available, unless otherwise specified.

Example 1

The embodiment provides a nickel-based superalloy and a preparation method thereof, and the preparation method comprises the following steps:

1) according to the weight percentage of each component shown in the table 1, the simple substances of each component are taken for smelting to prepare an alloy part; the alloy piece was processed by argon atomization to produce the powder of this example.

2) The particle size of the powder of this example was controlled to be within 50 μm by sieving, and the median particle diameter D50 was 35 μm.

3) And (3) constructing a block model of the nickel-based high-temperature alloy product, preparing a program file before forming and processing technological parameter setting, introducing the program file and the processing technological parameter setting into additive manufacturing equipment, and processing by adopting a selective laser melting method. Wherein the parameters of the selective laser melting processing technology are as follows: the preset temperature of the substrate is 200 ℃, the laser power is 220W, the powder layer thickness is 30 mu m, the scanning speed is 800mm/s, and the scanning interval is 0.1 mm.

4) The machined nickel-base superalloy preform is subjected to heat treatment, machining and surface treatment in sequence to obtain the nickel-base superalloy, and a local surface topography of the nickel-base superalloy is shown in fig. 3 (a). Wherein the heat treatment process comprises the following steps: heating the sample from room temperature to 1100 ℃ at the heating rate of 5 ℃/min, then preserving the heat for 12h, and then cooling the sample to room temperature in air; and then heating the sample from room temperature to 700 ℃ at the heating rate of 5 ℃/min, preserving the temperature for 24h, and then cooling the sample to room temperature in air.

Example 2

The embodiment provides a nickel-based superalloy and a preparation method thereof, and the preparation method comprises the following steps:

1) according to the weight percentage of each component shown in the table 1, the simple substances of each component are taken for smelting to prepare an alloy part; the alloy piece was processed by rotary electrode atomization to produce the powder of this example.

2) The particle size of the powder of this example was controlled to be within 150 μm by sieving, and the median particle diameter D50 was 75 μm.

3) And (3) constructing a block model of the nickel-based high-temperature alloy product, preparing a program file before forming and processing technological parameter setting, introducing the program file and the processing technological parameter setting into additive manufacturing equipment, and processing by adopting an electron beam melting method. Wherein, the electron beam melting processing technological parameters are as follows: the preheating temperature of the substrate is 1000 ℃, the accelerating voltage is 60kV, the powder layer thickness is 75 μm, the maximum current is 18mA, the scanning distance is 0.125mm, and the powder layer thickness is 75 μm.

4) The machined nickel-base superalloy preform is subjected to heat treatment, machining and surface treatment in sequence to obtain the nickel-base superalloy, and a local surface topography of the nickel-base superalloy is shown in fig. 3 (b). Wherein the heat treatment process comprises the following steps: heating the sample from room temperature to 1100 ℃ at the heating rate of 5 ℃/min, then preserving the heat for 12h, and then cooling the sample to room temperature in air; and then heating the sample from room temperature to 700 ℃ at the heating rate of 5 ℃/min, preserving the temperature for 24h, and then cooling the sample to room temperature in air.

Control group 1:

this control group was prepared from IN738LC alloy as a starting material using laser selective melting (SLM) and was described IN Michael Cloots, Peter J.Uggowtzer, Konrad Wegenerer, investments on the microstructuring and crack formation of IN738LC samples processed by selective laser melting using Gaussian and doughenprofiles, Materials & Design,89(2016)770 784.

Control group 2

The control group uses IN625 Alloy as raw material, adopts nickel-based high-temperature Alloy prepared by laser selective melting (SLM), and refers to Amato K.Comparison of microstructures and properties for a Ni-base superalloys (Alloy 625) fabricated by electron beam melting.J. Mater Sci Res 2012; 1(2):3.

Control group 3

The present control group uses IN625 alloy as raw material and nickel-based superalloy prepared by Electron Beam Melting (EBM) method, see Yadritsev I, Thivilleon L, Bertrand P, et al, Strategy of manufacturing compositions with designed internal structure by selective laser, 2007,254(4), Applied Surface Science 983.

TABLE 1

As can be seen from fig. 3, the additive manufactured products of examples 1 and 2 have no obvious defects such as cracks and holes on the surfaces, which indicates that the alloy compositions of examples 1 and 2 are suitable for the additive manufacturing process, have a lower risk of cracking in the additive manufacturing process, and have good printability.

IN contrast group 1, IN738LC is used as a raw material, and the product is made of the nickel-based superalloy additive prepared by selective laser melting, and the product has defect alloys such as cracks, holes and the like.

The component formula designed by the invention can reduce the risk of generating holes and cracks in the additive manufacturing process of the nickel-based superalloy alloy, and the applicable process is wide.

The room temperature tensile properties of the additive manufactured products prepared in examples 1 and 2 were tested, respectively, as follows: two example alloy tensile specimens were prepared along the 3D printing build direction according to standard ISO 7500-1-2018, room temperature tensile testing was conducted with a tensile rate of 1mm/min, and the properties of the IN625 alloy prepared by 3D printing of control 2 and 3 were compared, the results are shown IN table 2.

TABLE 2

As can be seen from table 2, the additive manufactured products prepared in examples 1 and 2 also have better mechanical properties.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.