Method for improving performance of AlSi10Mg alloy prepared through SLM

Abstract

The invention provides a method for improving the performance of an AlSi10Mg alloy prepared through SLM, and the method comprises the following steps: generating an electromagnetic field by using an electromagnetic auxiliary device, and preparing an AlSi10Mg alloy component through SLM under the auxiliary action of the electromagnetic field; and the AlSi10Mg alloy component is subjected to aging treatment, so that the performance of the AlSi10Mg alloy prepared through SLM is improved. The strength and plasticity of the AlSi10Mg alloy prepared through SLM are both considered, and therefore the performance of the alloy is overall improved.

Description

Technical Field

[0001] The present invention relates to the technical field of additive manufacturing, and specifically, to a method for improving the properties of AlSi10Mg alloy prepared by SLM. Background Art

[0002] As a representative modern forming technology, additive manufacturing is widely used in the manufacturing of metal components in industries such as aerospace, automotive, marine, and medical devices. Laser powder bed fusion provides design freedom and flexibility, enabling the manufacture of geometrically complex or lightweight structures, while also providing excellent mechanical properties and unique microstructures. However, the process is characterized by a high melt pool cooling rate (~10 6 K / s) and a large temperature gradient, which can lead to an enhanced tendency of interlayer epitaxial growth and anisotropy of properties, and also affect the microstructure, including the formation of structural defects, element segregation, spheroidization, and the formation of anisotropic microstructures and crystal textures, which usually reduce the strength and toughness of the alloy. Therefore, there are still many challenges in the preparation of AlSi10Mg alloy by laser powder bed fusion.

[0003] In response to the above problems, some scholars at home and abroad have used external physical fields to improve the metal solidification structure to reduce internal defects, and also used post-treatment processes to reduce the internal residual stress of the formed parts to improve the strength. The external magnetic field can affect the melt pool solidification condition by changing the melt convection and thermal field, so as to achieve the regulation of the microstructure and grain morphology, mainly to refine the grains. The post-treatment process improves the strength by releasing the internal residual stress of the metal part and precipitating strengthening phases. After solution treatment, higher ductility can also be obtained by sacrificing strength. However, there are limitations in applying magnetic field assistance and post-treatment processes in improving the microstructure and performance. The former plays an important role in reducing pore defects and refining grains, while the latter focuses more on the regulation of element segregation and phase composition in the metal, and the improvement effects on the microstructure morphology and defects are different, resulting in differences in the improvement of performance, and thus there are limitations.

[0004] The patent with the application publication number CN113275568A discloses an electromagnetic induction heating-assisted SLM forming device and forming method, which reduces the temperature gradient between the melt pool and the solidified area by preheating the laser processing plane in real time, reduces the internal stress during the forming process, and reduces the number of microcracks in the nickel-based superalloy with high crack sensitivity. This prior art mainly aims to reduce the internal stress during the forming process and realizes the improvement of the overall performance of the alloy material.

[0005] The patent with the application publication number CN114952439A discloses a method for enhancing the strength and toughness of nickel-based alloy magnetic particle polishing based on additive manufacturing. On the basis of using selective laser melting technology, a composite treatment of magnetic abrasive polishing and heat treatment is adopted to obtain alloy parts with excellent performance. The strength and comprehensive mechanical properties of the alloy parts are effectively improved. This method reduces surface microcracks by electromagnetic grinding and polishing the surface of the additive manufacturing components, mainly used to improve the fatigue performance of the material. This method does not take into account the strength and plasticity of the material, and the mechanical properties of the material need to be further improved. Summary of the Invention

[0006] Aiming at the defects in the prior art, the purpose of the present invention is to provide a method for improving the performance of SLM-prepared AlSi10Mg alloy.

[0007] The present invention proposes a method for effectively improving the performance of SLM-prepared AlSi10Mg alloy samples. After preparing the samples by electromagnetic field-assisted SLM, the post-treatment process is improved to reduce the sacrifice of plasticity while increasing the strength. This method aims to balance strength and plasticity and achieve an overall improvement in the performance of the alloy.

[0008] The present invention provides a method for improving the performance of SLM-prepared AlSi10Mg alloy, which includes:

[0009] Using an electromagnetic assistance device to generate an electromagnetic field. Under the assistance of the electromagnetic field, an AlSi10Mg alloy component is prepared by SLM;

[0010] Performing aging treatment on the AlSi10Mg alloy component to improve the performance of SLM-prepared AlSi10Mg alloy.

[0011] Further, the generation of the electromagnetic field by the electromagnetic assistance device includes: by adjusting the intensity and direction of the electromagnetic field, making the AlSi10Mg alloy component prepared by SLM within the magnetic field coverage range, and the electromagnetic field regulates the solidification process of the AlSi10Mg alloy melt pool.

[0012] Further, the intensity of the electromagnetic field is not greater than 0.22T.

[0013] Further, under the assistance of the electromagnetic field, an AlSi10Mg alloy component is prepared by SLM, wherein: the thermal electromagnetic effect of the electromagnetic field is used to refine the columnar crystals of the AlSi10Mg alloy component and reduce the generation of pore defects.

[0014] Further, the thermal electromagnetic effect of the electromagnetic field promotes the transformation of columnar crystals of the AlSi10Mg alloy component into equiaxed crystals.

[0015] Optionally, the AlSi10Mg alloy component is subjected to aging treatment, wherein: the aging treatment temperature is 150-200 °C.

[0016] Optionally, the AlSi10Mg alloy component is subjected to aging treatment, wherein: the aging treatment time is 2-4 hours.

[0017] Furthermore, the electromagnetic assistance device is located inside the SLM device and includes:

[0018] A base, located on the printing device;

[0019] An electromagnetic field generating device, located on the base, and the electromagnetic field generating device is used to generate a magnetic field;

[0020] A substrate, used to place the printing sample, the base and the substrate form a closed structure, and the electromagnetic field generating device is placed inside the closed structure;

[0021] An information device, connected to the electromagnetic field generating device, and the information device controls the spatial intensity and distribution of the magnetic field generated by the electromagnetic field generating device to cover the printing sample;

[0022] A client, connected to the information device, and the client serves as a control interface.

[0023] Furthermore, a first groove for placing the electromagnetic field generating device is provided on the surface of the base, a second groove matching the first groove of the base is provided on the substrate, and the upper surface of the electromagnetic field generating device fits with the second groove of the substrate.

[0024] Compared with the prior art, the present invention has at least one of the following beneficial effects:

[0025] The method provided by the present invention can refine columnar crystals and induce the transformation of columnar crystals to equiaxed crystals, i.e., CET transformation, by utilizing the thermo-electromagnetic effect during the SLM preparation of AlSi10Mg alloy, and effectively reduces the porosity defects of the alloy; by adjusting the intensity of the magnetic field, a large number of equiaxed crystals appear during the part forming process, effectively improving the quality of the sample in the electromagnetic field assistance stage. After short-time low-temperature aging treatment, the rupture of a small amount of dendritic regions will further promote the grain refinement, and with the precipitation of nano-Si brittle hard phases, there will be an increase in strength, especially the yield strength. In addition, due to the action of the magnetic field in the early stage, the porosity defects are reduced, and the plasticity itself has a significant improvement. The method of the present invention takes into account both the strength and plasticity of the AlSi10Mg alloy prepared by SLM, thus overall improving the performance of the alloy. Description of the Drawings

[0026] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non - limiting embodiments read in conjunction with the accompanying drawings:

[0027] Figure 1 wherein, (a) is the pore change diagram without applied magnetic field; (b) is the pore change diagram with magnetic field assistance;

[0028] Figure 2 is a schematic structural diagram of an electromagnetic field - assisted device in an embodiment of the present invention;

[0029] Figure 2 The corresponding reference numerals in the figure are: 1 - electromagnetic field generating device, 2 - base, 3 - substrate, 4 - information device, 5 - client;

[0030] Figure 3 wherein, (a) is the grain morphology change diagram without applied magnetic field; (b) is the grain morphology change diagram with magnetic field assistance;

[0031] Figure 4 is a performance comparison diagram of samples prepared by the method in the embodiment of the present invention and samples prepared conventionally;

[0032] Figure 5 is the tensile property curve corresponding to samples prepared under different magnetic field intensities;

[0033] Figure 6 is the tensile property curve corresponding to samples prepared under different printing parameters after normal aging treatment. Detailed Embodiments

[0034] The present invention will be described in detail below with reference to specific embodiments. The following embodiments will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can be made. These all fall within the protection scope of the present invention.

[0035] A method for improving the performance of SLM - prepared AlSi10Mg alloy provided by an embodiment of the present invention includes:

[0036] S1. Generate an electromagnetic field by using an electromagnetic - assisted device, and under the assistance of the electromagnetic field, obtain an AlSi10Mg alloy component through SLM;

[0037] S2. Perform aging treatment on the AlSi10Mg alloy component, thereby improving the performance of the SLM - prepared AlSi10Mg alloy.

[0038] In the embodiments of the present invention, it includes the preparation of AlSi10Mg alloy by electromagnetic field-assisted SLM and the heat treatment process after printing. By using the coupling technology of electromagnetic field assistance and post-treatment, the overall properties such as strength and plasticity of the AlSi10Mg alloy prepared by SLM are improved.

[0039] In the embodiments of the present invention, the additive manufacturing process is assisted by a magnetic field. The solidification of the molten pool and the microstructure are optimized through the thermo-electromagnetic effect, achieving the effects of refining grains and reducing microsegregation. Then, through heat treatment, the microstructure is further optimized, and the mechanical properties of the material are improved through the combined action of the magnetic field and heat treatment.

[0040] In some embodiments, an electromagnetic field assistance device is introduced into the process of preparing AlSi10Mg alloy by SLM for regulation. By adjusting the intensity and direction of the electromagnetic field, within the magnetic field coverage range of the AlSi10Mg alloy component prepared by SLM, the electromagnetic field regulates the solidification process of the AlSi10Mg alloy molten pool.

[0041] The combination of different materials and different processes may lead to unexpected results. Some materials may exhibit unstable physical or chemical reactions under the action of specific externally applied physical fields, thereby affecting the final post-treatment effect. Therefore, how to make the post-treatment process adapt to the characteristics of different materials and ensure the repeatability of the treatment effect is an important challenge. In the embodiments of the present invention, through material characteristic analysis, such as the solubility and precipitation behavior of AlSi10Mg alloy, etc., and then parameters such as the intensity, direction, and frequency of the physical field suitable for different materials are formulated.

[0042] The generation of an electromagnetic field is usually related to the flow of current. The intensity, direction, and distribution of the current determine the properties of the electromagnetic field. The magnitude of the current directly affects the intensity of the electromagnetic field. According to Ampere's law, the larger the current, the stronger the generated magnetic field. The direction of the current determines the direction of the electromagnetic field. According to the right-hand rule, the current direction and the direction of the generated magnetic field are interrelated. The intensity of the electromagnetic field is related to the distance from the current source or electromagnetic source. According to Coulomb's law and Ampere's law, the relationship between the intensity of the electromagnetic field and the distance is generally an inverse relationship. For a static current source: the magnetic field intensity generally decreases with the increase of distance, usually inversely proportional to the first order or square of the distance. For a time-varying current source: if it is an alternating current, the magnetic field intensity not only changes with distance but is also affected by the current frequency. The frequency of an electromagnetic wave is closely related to the relationship between the electric field and the magnetic field. In the high-frequency case, the change speed of the electric field and the magnetic field is relatively fast, and the distribution of the electromagnetic field will vary due to different frequencies. Low frequency (direct current or low-frequency alternating current): The generated magnetic field changes slowly, and the distribution of the magnetic field in space is relatively stable. High frequency (microwave or radio frequency): The change speed of the electromagnetic field is faster, the change of the magnetic field intensity and direction is more complex, and it is greatly affected by the dielectric constant and magnetic permeability of the medium.

[0043] Low magnetic field intensity (10–100 mT) is suitable for mild magnetic field effects, mainly used to reduce defects and optimize the microstructure of materials, and improve the forming quality. Medium magnetic field intensity (100 mT–1 T) can produce a more obvious strengthening effect in alloys, improve the grain structure of materials, and enhance the mechanical properties of alloys. High magnetic field intensity (above 1 T) is suitable for enhancing the surface hardness of materials or changing the phase structure of alloys, but it needs to be carefully controlled to avoid excessive grain refinement or premature precipitation of strengthening phases, which will affect the ductility of materials. Specifically, the intensity of the electromagnetic field in the above embodiments of the present invention is not greater than 0.22 T. When the magnetic field intensity is in the range of 0–0.12 T, the first change is the reduction of dendrite spacing and the appearance of a small amount of equiaxed grains. When the magnetic field intensity is in the range of 0.12 T–0.18 T, due to the reduction of dendrite spacing, the transformation of equiaxed grains is easier, so a large number of equiaxed grains appear inside the molten pool. When the magnetic field intensity is in the range of 0.18 T–0.22 T, equiaxed grains have become the main morphology inside the molten pool. Within this magnetic field intensity range, as the magnetic field intensity increases, the optimization effect improves, but the amplitude of performance improvement decreases, indicating that further increasing the magnetic field intensity subsequently will not result in an obvious performance improvement effect. In the embodiments of the present invention, controlling the magnetic field intensity within a small range is convenient for control and also helps to reduce costs.

[0044] In some preferred embodiments, the magnetic field intensity is 0.1 T–0.5 T. The magnetic field intensity in this range is sufficient to improve the overall performance of the alloy by optimizing the molten pool dynamics, controlling the flow of molten metal, reducing defects such as porosity, and promoting grain refinement.

[0045] In the above embodiments of the present invention, by utilizing the thermo-electromagnetic effect of the electromagnetic field, the grains of columnar crystals in the AlSi10Mg alloy component can be refined, and the generation of pore defects can be reduced. As Figure 1 shown, in the case of magnetic field assistance, the pores in the alloy structure are significantly fewer than those without applying a magnetic field. Preferably, by utilizing the thermo-electromagnetic effect of the electromagnetic field, the transformation of columnar crystals to equiaxed crystals can be induced, further improving grain refinement, and thus having a better performance strengthening effect.

[0046] Factors such as the intensity, direction, and frequency of the externally applied physical field have a significant impact on the processing effect of materials. How to precisely adjust the parameters of the externally applied physical field to form an effective synergy with the post-treatment process, which can not only optimize the material properties but also avoid unnecessary energy loss or structural defects, is one of the technical difficulties to be overcome in this application. The embodiments of the present invention design an electromagnetic field assistance device for dynamically adjusting the parameters of the externally applied physical field (such as intensity, direction, frequency, etc.), and real-time monitor the state of the material and use adaptive control technology to adjust the parameters of the externally applied physical field in real time.

[0047] Refer to Figure 2, in some embodiments, the electromagnetic assistance device is located inside the SLM device, and it includes a base, a substrate, an electromagnetic field generating device, an information device, and a client; the base is located on the printing device, the electromagnetic field generating device is located on the base and is used to generate a magnetic field; the substrate is used to place the printing sample, i.e., the AlSi10Mg alloy component is on the surface of the substrate, the base and the substrate form a closed structure, the electromagnetic field generating device is placed inside this closed structure, and the upper surface of the electromagnetic field generating device fits with the substrate; the information device is connected to the electromagnetic field generating device, and the information device controls the spatial intensity and distribution of the magnetic field generated by the electromagnetic field generating device to cover the printing sample; the client is connected to the information device, and the client serves as a control interface.

[0048] After the SLM preparation of the AlSi10Mg alloy sample starts, the client controls the electromagnetic field generating device through the information device, so that the spatial intensity distribution of the generated magnetic field covers the printing sample, regulates the solidification process of the AlSi10Mg alloy melt pool, promotes the transformation of equiaxed grains and reduces the generation of pore defects.

[0049] In some embodiments, the surface of the base is provided with a first groove for placing the electromagnetic field generating device, and a second groove matching the first groove of the base is provided under the substrate, and the upper surface of the electromagnetic field generating device fits with the second groove of the substrate. Specifically, the first groove is inside the middle of the base and is used to place the electromagnetic field generating device. The second groove is at the middle position of the substrate and matches the base, thus forming a closed space. The second groove on the substrate can fix the electromagnetic field generating device to be stable in a region and reduce the distance from the surface of the substrate, so that the magnetic field space can cover the alloy component.

[0050] The electromagnetic field assistance device in the embodiments of the present invention is easy to install and suitable for use with a variety of devices, especially for small SLM devices. The intensity and direction of the magnetic field are first determined by the magnetic field source. Therefore, the adjustability of the magnetic field source directly affects the adjustment ability of the magnetic field. In a dynamic electromagnetic field, the system controlling the current source can adjust the current intensity in real time, so that the intensity of the magnetic field can be accurately controlled as needed, and the change of the current direction directly determines the change of the magnetic field direction. By adjusting the current, the intensity and direction of the magnetic field are easily changed, and real-time multi-parameter regulation (including magnetic field intensity, magnetic field direction, current intensity, current direction, coil shape, etc.) of the microstructure can be carried out.

[0051] In the above embodiments of the present invention, during the SLM printing process, a magnetic field environment is created by using the electromagnetic field assistance device, and by adjusting the intensity and direction of the generated magnetic field in space, the prepared metal component is within the magnetic field coverage range, so as to achieve the regulation effect on the microstructure.

[0052] Specifically, the presence of high temperature and liquid metal during laser melting, the interaction between magnetic field and current will lead to the generation of thermoelectromagnetic effect. Due to the thermoelectromagnetic effect at the scale of molten pool and dendrite, the introduced static magnetic field will affect the current distribution and temperature field in the micro-molten pool. The generation of thermoelectromagnetic current is based on the Seebeck effect: when two metals with different Seebeck coefficients are connected at both ends, and there is a certain temperature gradient between the two contacts, a thermoelectric potential will be generated in the circuit, forming a thermoelectric current. The interaction between the thermoelectric current and the magnetic field generates a Lorentz force, J TE ×B. This force will drive the melt near the solidification interface to flow in a certain area, thereby generating a thermo-electromagnetic convection effect. Inside the dendrite, due to the interaction between the thermal current and the magnetic field, a Lorentz force will be generated on the solid phase, which will generate torque and stress on the dendrite, thereby destroying the growth of the crystal and causing the dendrite to break, resulting in grain refinement. Figure 3 As shown, compared with the case without applied magnetic field, the grains in the alloy structure are obviously refined with the assistance of magnetic field.

[0053] In order to achieve post-processing of AlSi10Mg alloy components, the components that have been printed under the assistance of electromagnetic fields are subjected to short-term low-temperature aging treatment. The annealing treatment of AlSi10Mg alloy is mainly to relieve stress and improve plasticity, and it is unlikely to significantly change the hardness or strength of the alloy. The temperature is about 200°C to 350°C, and the time is 2 to 4 hours; while the aging treatment is to precipitate strengthening phases to improve the strength and hardness of the material. The temperature is about 160°C and the time is 6 to 8 hours. The embodiment of the present invention takes into account the different effects of the two on material properties. The post-processing method comprehensively considers the annealing and aging treatment of AlSi10Mg to determine the temperature and time. In some embodiments, the temperature of the aging treatment is 150 to 200°C, and the time of the aging treatment is 2 to 4 hours.

[0054] The low-temperature aging heat treatment in the above embodiment of the present invention is between the aging and annealing temperatures in terms of temperature, which is significantly higher than the aging temperature but not up to the annealing temperature, so as to achieve the effect of both effective stress relief and precipitation of strengthening phases; the time is different from the long time of aging treatment and is close to the annealing time. This is because the aging treatment itself is to precipitate strengthening phases. After the temperature is increased, the precipitation time of strengthening phases can be shortened. However, the temperature is close to the annealing temperature, so the stress relief effect can be achieved. Due to the high temperature itself, too long a time will cause grain coarsening. Through the above parameter settings, a more uniform precipitation phase is formed in the alloy, the hardness and strength of the alloy are improved, and at the same time, the grain growth and excessive embrittlement of the material caused by excessively high temperatures are avoided.

[0055] The low-temperature aging heat treatment in the above embodiments of the present invention is a selective heat treatment process based on the refinement of grains by magnetic field-assisted printing in the early stage to reduce microsegregation. This process can further reduce the internal stress of the material, weaken the material strength, improve the material ductility, and help improve the comprehensive performance of the material.

[0056] For the samples after short-time low-temperature aging treatment, there are no obvious changes in their microstructure and grain morphology, but some grid Si in the fine dendritic region will break, and even nano-Si will precipitate. Nano-Si, as a brittle and hard phase, has a strengthening effect, and a small part of the broken and dissolved grid Si helps to improve plasticity, which will weaken the reduction of plasticity caused by the increase in strength, thus achieving an overall improvement in performance.

[0057] During the process of preparing AlSi10Mg alloy by SLM, the interaction relationship between the applied physical field and the post-treatment is relatively complex. The combination of the applied physical field and the post-treatment process involves effects at multiple scales. Comprehensive optimization is required from the change of microscopic atomic structure to the adjustment of macroscopic tissue properties. In practical applications, how to balance various factors between different scales to ensure the improvement of overall performance while avoiding the deterioration of local performance is the core problem to be solved in this application. The effects of different physical fields may have different impacts on the structure and performance of the material. Especially during the processing, how to precisely control the combined action of the two to avoid mutual interference or negative effects is a key problem. In the embodiments of the present invention, a multi-physical field model is established by using numerical simulation software (such as COMSOL or ANSYS) to simulate the coupling effect of the electromagnetic field and the heat treatment process. Through the joint simulation of the temperature field, electromagnetic field, force field, etc. under the action of different physical fields, the influence of the applied physical field on the microscopic tissue structure and defects of the material is accurately predicted to avoid mutual interference. Based on the simulation model, the model is verified by actual experimental data, and the parameters of the applied physical field are adjusted to ensure that the synergistic effect of the two meets the expectations. Specifically, first, a hierarchical simulation method is adopted. The influence of the electromagnetic field on the microscopic tissue and defects is analyzed through the microscopic scale model, and then the overall performance of the alloy is analyzed through the macroscopic scale model, so as to achieve the coordination and optimization between different scales. In addition, reliable parameters of the applied physical field are obtained by verifying the numerical simulation results.

[0058] The method for improving the performance of AlSi10Mg alloy prepared by SLM in the above embodiments of the present invention mainly includes electromagnetic field assistance and short-time low-temperature aging treatment. The two methods are in order. The regulation effect of the magnetic field is mainly reflected in the change of grain morphology, that is, inducing the transformation of columnar grains into equiaxed grains. The subsequent heat treatment process is mainly formulated for AlSi10Mg alloy and combined with electromagnetic field assistance to achieve the best effect. The combination of the two methods can effectively improve the overall performance such as strength and plasticity of AlSi10Mg alloy prepared by SLM.

[0059] It should be noted that, in addition to the AlSi10Mg alloy, the magnetic field application and post-treatment composite process in the above preparation process also have the effect of improving the performance of many other materials. The static magnetic field-assisted SLM technology also has an impact on materials such as nickel-based superalloys. Similarly, aging treatment can improve the high-temperature strength and oxidation resistance of nickel-based alloys, improve the strength of magnesium alloys, especially the precipitation of the Mg2Si phase, improve the hardness and strength of copper alloys, especially copper alloys containing aluminum and zinc elements, and improve the hardness, fatigue resistance and plasticity of cast iron.

[0060] As Figure 4 shown, Figure 4 In the figure, the solid line is the tensile property curve of the sample prepared by the method in the embodiment of the present invention, and the dashed line is the tensile property curve of the sample prepared by conventional printing without any auxiliary method. The conventionally prepared sample is the sample printed under the printing parameters such as laser power and scanning speed that can prepare a relatively high density. The abscissa is the strain, which is used to reflect the plasticity of the material. The larger the value, the better the plasticity; the ordinate is the stress, which is used to reflect the strength of the material; the corner of the curve reflects the yield strength of the material. Compared with the conventionally prepared sample, the sample prepared by the method in the embodiment of the present invention has both higher strength and plasticity.

[0061] Figure 5 are the tensile property curves corresponding to different magnetic field intensities. Within a certain range, as the magnetic field intensity increases, the performance of the sample (including strength and plasticity) is improved. Figure 6 are the results under different printing parameters after ordinary aging treatment. Simple low-temperature aging treatment can only improve the strength, and the plasticity is not improved but decreased.

[0062] The method in the above embodiment of the present invention takes into account the strength and plasticity of the AlSi10Mg alloy prepared by SLM, thereby improving the overall performance of the alloy. The whole process flow is simple and effective, does not involve large equipment modification, and the heat treatment process takes a short time, so as to improve production efficiency.

[0063] The specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and those skilled in the art can make various deformations or modifications within the scope of the claims, which does not affect the essence of the present invention. The above preferred features can be combined arbitrarily without conflict.

Claims

1. A method for improving the performance of AlSi10Mg alloy prepared by SLM, characterized in that: include: An electromagnetic field is generated by an electromagnetic auxiliary device, and an AlSi10Mg alloy component is prepared by SLM under the assistance of the electromagnetic field; The AlSi10Mg alloy component is subjected to aging treatment to improve the performance of the AlSi10Mg alloy prepared by SLM.

2. The method for improving the performance of AlSi10Mg alloy prepared by SLM according to claim 1, characterized in that: The electromagnetic field is generated by the electromagnetic auxiliary device, including: adjusting the intensity and direction of the electromagnetic field so that the AlSi10Mg alloy component prepared by SLM is within the coverage of the magnetic field, and the electromagnetic field regulates the solidification process of the AlSi10Mg alloy molten pool.

3. The method for improving the performance of AlSi10Mg alloy prepared by SLM according to claim 2, characterized in that: The intensity of the electromagnetic field is no more than 0.22T.

4. The method for improving the performance of AlSi10Mg alloy prepared by SLM according to claim 1, characterized in that: The AlSi10Mg alloy component is prepared by SLM under the auxiliary action of the electromagnetic field, wherein: the thermal electromagnetic effect of the electromagnetic field is used to refine the columnar crystals of the AlSi10Mg alloy component and reduce the generation of pore defects.

5. The method for improving the performance of AlSi10Mg alloy prepared by SLM according to claim 4, characterized in that: The thermo-electromagnetic effect of the electromagnetic field promotes the transformation of columnar crystals to equiaxed crystals in the AlSi10Mg alloy component.

6. The method for improving the performance of AlSi10Mg alloy prepared by SLM according to claim 1, characterized in that: The AlSi10Mg alloy component is subjected to aging treatment, wherein the aging treatment temperature is 150-200°C.

7. The method for improving the performance of AlSi10Mg alloy prepared by SLM according to claim 1, characterized in that: The AlSi10Mg alloy component is subjected to aging treatment, wherein the aging treatment time is 2 to 4 hours.

8. The method for improving the performance of AlSi10Mg alloy prepared by SLM according to claim 1, characterized in that: The electromagnetic assist device is located inside the SLM device and includes: a base, located on the printing device; An electromagnetic field generating device, located on the base, and used to generate a magnetic field; A substrate, used for placing a printed sample, wherein the base and the substrate form a closed structure, and the electromagnetic field generating device is placed in the closed structure; An information device connected to the electromagnetic field generating device, the information device controls the spatial intensity and distribution of the magnetic field generated by the electromagnetic field generating device to cover the printed sample; A client is connected to the information device and serves as a control interface.

9. The method for improving the performance of AlSi10Mg alloy prepared by SLM according to claim 8, characterized in that: The surface of the base is provided with a first groove for placing the electromagnetic field generating device, the substrate is provided with a second groove matching the first groove of the base, and the upper surface of the electromagnetic field generating device is in contact with the second groove of the substrate.

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