71 results about "Electron-beam additive manufacturing" patented technology

The invention relates to an electron beam additive manufacturing method and system for a titanium-aluminum intermetallic compound, and the electron beam additive manufacturing method for the titanium-aluminum intermetallic compound is realized through the electron beam additive manufacturing system for the titanium-aluminum intermetallic compound. The invention relates to a method for carrying out layer-by-layer stacking forming according to a preset track, carrying out follow-up scanning heating by adopting at least two electron beams and homogenizing a temperature field of a formed part, in particular to a rapid additive manufacturing method for a high-temperature material which is difficult to weld and needs a small temperature gradient and low stress in the forming process. The method can solve the problems of high manufacturing difficulty, high manufacturing cost and the like of the current common processing technology of intermetallic compound parts such as titanium and aluminum.

The present invention provides a titanium diboride particle-reinforced heat-resistant aluminum alloy powder for electron beam additive manufacturing. The chemical composition of the aluminum alloy powder includes, by mass percentage, Cu: 1.8-2.7%, Ni: 0.8-1.4%, Mg: 0-1.8%, Fe: 0.1-1.4%, TiB2 particles 0.1-10%, and the balance is aluminum. The main steps of its preparation method are: melting of the particle-reinforced aluminum alloy preform ingot and gas atomization forming of the particle-reinforced aluminum alloy powder. The block formed by electron beam additive manufacturing using the titanium diboride particle-reinforced heat-resistant aluminum alloy powder of the present invention has no cracks, and the microstructure is uniform and the grains are fine. After heat treatment, the obtained tensile strength is 320 MPa, and the elongation is greater than 10%, which is better than the average level of the mechanical properties of electron beam additive manufacturing aluminum alloys.

The invention discloses a high-strength copper-steel double-metal composite material and a preparation method of the high-strength copper-steel double-metal composite material. Copper and steel base materials for preparing the high-strength copper and steel double-metal composite material are selected; the copper base material and the steel base material are welded through the electron beam additive manufacturing technology; scanning a welding seam of the copper-steel bimetallic composite material by using an ultrasonic detection system; analyzing and processing the scanned image through a computer; carrying out secondary treatment on the copper-steel double-metal composite material by adopting a rolling compounding method; carrying out quenching treatment on the copper-steel double-metal composite material; inspecting the performance of the high-strength copper-steel bimetallic composite material; and storing the prepared data to a cloud end through a computer. According to the method, the electron beam additive manufacturing technology and the rolling composite method are combined, the strength of the copper-steel composite material can be improved in the preparation process, the composite material is detected through an ultrasonic detection system, the percent of pass of the composite material can be screened, and the performance of the composite material can be further enhanced through annealing treatment.

The invention relates to a TiAl alloy additive manufacturing method. The TiAl alloy additive manufacturing method comprises the steps that TiAl alloy powder is selected; establishing a three-dimensional model; a scanning path is planned; when the section width of the part is smaller than the preset partition width, a standard scanning line length is adopted for scanning; on the contrary, the section of the part is subjected to region division, and the partition scanning line length is adopted for scanning; the standard scanning line is longer than the partition scanning line; and the TiAl alloy powder is loaded into a powder bin of electron beam additive manufacturing equipment, and scanning melting is carried out. According to the method, the content of the Al element in the TiAl alloy powder is controlled, so that the alloy solidification process is carried out according to a beta solidification path, and formation of fine isometric crystals is facilitated; by controlling the content of the B element, borides which are distributed in a dispersed mode are formed, and the effect of refining the microscopic structure is achieved; by setting the preset partition width, the partition lap joint width and the partition offset width, the structure and performance difference caused by remelting at the partition scanning lap joint is solved.

The invention belongs to the related technical field of additive manufacturing, and discloses an electron beam melting wire liquid nitrogen copious cooling additive manufacturing method and system.The method comprises the steps that in the electron beam melting printing forming process, liquid nitrogen is sprayed to a molten printing wire under electron beam irradiation, and the liquid nitrogen is sprayed to the molten printing wire; the molten printing wires are subjected to nitridation reaction under the action of electron beams while being subjected to liquid nitrogen cryogenic cooling, so that the crystal structure of a formed part is regulated and controlled, and the mechanical performance is enhanced; and / or liquid nitrogen is sprayed to the printing wire material which begins to be solidified, so that the printing wire material is subjected to liquid nitrogen deep cooling, and the crystal structure of the formed part is regulated and controlled to achieve mechanical property enhancement. Liquid nitrogen is introduced into the electron beam additive manufacturing device for deep cooling, the extruded printing wire is solidified at an extremely high cooling speed after being melted, a large number of homogeneous nucleation sites are formed in a melting area due to the high supercooling degree, the solidification speed is high, a microstructure is customized into uniform and fine equiaxed crystals, the strength and toughness of the material are improved, and the production cost is reduced. The mechanical property is improved.

The invention relates to the technical field of additive manufacturing, in particular to an electron beam additive manufacturing cooling method and electron beam additive manufacturing equipment. The electron beam additive manufacturing cooling method comprises the following steps that a vacuum forming chamber is filled with mixed cooling gas, the mixed cooling gas comprises helium and balance gas, and the balance gas comprises argon and / or neon; after the mixed cooling gas fully exchanges heat in the vacuum forming chamber, the temperature in the vacuum forming chamber is detected and obtained; when the obtained temperature in the vacuum forming chamber is higher than a preset temperature; and if yes, the mixed cooling gas filled in the vacuum forming chamber is pumped out, and the mixed cooling gas is filled in the vacuum forming chamber again. According to the electron beam additive manufacturing cooling method provided by the invention, the mixed cooling gas is circularly filled into the vacuum forming chamber, so that the cooling efficiency of the vacuum forming chamber is effectively improved. In addition, mixed cooling gas is filled into the vacuum forming chamber, so that the cooling cost is reduced, and the cooling efficiency is also ensured.

The invention discloses a method suitable for preparing a high-strength titanium alloy with both strength and plasticity by an additive manufacturing process, which comprises the following steps of: 1, carrying out vacuum consumable electrode arc melting on raw materials twice to obtain a secondary cast ingot; secondly, the secondary cast ingot is machined into a round rod, plasma rotating electrode atomization powder manufacturing is conducted on the round rod, and titanium alloy powder is obtained; thirdly, the titanium alloy powder is subjected to electron beam additive manufacturing, and a titanium alloy sample is obtained; and fourthly, the titanium alloy sample is subjected to heat treatment, and the high-strength titanium alloy with both strength and plasticity is obtained. According to the method, the quality of powder is greatly guaranteed through front vacuum consumable electrode electric arc melting and plasma rotating electrode atomization powder preparation, then the titanium alloy sample is obtained through electron beam additive manufacturing, the structure of the titanium alloy sample is regulated and controlled through heat treatment, and the high-strength titanium alloy with the uniform structure and high plasticity is obtained; according to the prepared high-strength titanium alloy with both the strength and the plasticity, the tensile strength is larger than 1300MPa, and meanwhile, the elongation percentage of 5% or above is kept.

The invention relates to an electron beam additive manufacturing method of a zirconium alloy implant. Comprising the following steps: controlling an energy source to preheat a substrate to a preset temperature at a stepped surface energy input density within total surface energy input time; the base plate is controlled to descend by a preset height, and zirconium alloy powder is laid on the preheated base plate; within the first energy input time, the energy source is controlled to conduct powder preheating on the zirconium alloy powder on the base plate at the first energy input density; the energy source is controlled to conduct selective melting on the preheated zirconium alloy powder with the second energy input density; and in the second body energy input time, the energy source is controlled to conduct thermal compensation on the powder bed obtained after selective melting according to the third body energy input density. According to the method, the stability in the printing process and the quality consistency of the target part are guaranteed by controlling the energy source according to the coupling parameters of the surface energy input density, the first body energy input density, the second body energy input density and the third body energy input density.

The invention provides a method for improving the structure uniformity of an electron beam additive manufacturing TiAl alloy, and relates to the technical field of additive manufacturing TiAl alloys. The method for improving the structure uniformity of the TiAl alloy manufactured through the electron beam additive specifically comprises the following steps that a base plate is preheated, specifically, the temperature of the base plate is preheated to 1100-1300 DEG C, and the forming environment temperature is not lower than 1000 DEG C; tiAl alloy powder is preheated, wherein non-focusing electron beams are adopted in the preheating mode, and gradient increasing is adopted in the heat input mode; and filling scanning: designing a defocusing value according to the energy density, and regulating and controlling the molten pool morphology and the molten pool thermal gradient. According to the method, the TiAl alloy component is prepared through substrate preheating, TiAl alloy powder preheating and filling scanning, through linkage optimization of electron beam non-focusing scanning key parameters, the forming process window of intermetallic compounds is effectively widened, the applicability of the TiAl alloy in the field of additive manufacturing is greatly improved, and the method is suitable for large-scale popularization and application. And a reliable method is provided for preparation of high-performance components.

Provided is a method for preparing a submicron Nb5Si3 particle-reinforced Nb-based refractory high-entropy alloy by a laser / electron beam in-situ reaction. Quasi-spherical composite powder of elemental Nb-Si with an atomic ratio of 5:3 is used as a raw material A, and an NbSS matrix alloy in the traditional refractory two-phase alloy is designed into an Nb(X, Y, Z ...) refractory high-entropy alloy (wherein X, Y, Z … means elements such as Ti, Zr, Hf, Nb, Ta, Mo, and V), which is prepared into spherical powder B by means of a rotating electrode atomization method; and then the A+B mixed powder is used as a raw material for laser / electron beam additive manufacturing, so that a submicron Nb5Si3 particle-reinforced Nb(X, Y, Z ...) refractory high-entropy alloy is prepared, and thus the particle-reinforced refractory high-entropy alloy is prepared by means of an in-situ reaction in a laser or electron beam selective melting process.

The invention belongs to the technical field of titanium alloy additive manufacturing, and particularly relates to an electron beam additive manufacturing method for oxygen-enriched titanium alloy. According to the method, circulating titanium alloy coarse powder with the oxygen content being 0.25 wt.%-0.30 wt.% is adopted, the circulating titanium alloy coarse powder is dried and then subjected to printing forming, and a powder layer is obtained; according to the method, electron beam powder bed cladding is conducted on a powder layer under the environment that the vacuum degree is 10 <-3 > Pa to 10 <-5 > Pa, a BCC phase is reserved by means of a steady-state thermal field formed by electron beam powder bed cladding at a preheated substrate at the temperature of 700 DEG C to 800 DEG C, in the deformation process, transformation from BCC to HCP and transformation from HCP to FCC are induced by stress, and the high-toughness oxygen-enriched titanium alloy is obtained; the excellent performance matching of the tensile strength of 1220 MPa and the elongation percentage of 14.5% is realized, and meanwhile, the uniform elongation percentage of 8.1% is kept.

The invention discloses an electron beam additive manufacturing method for an integrated copper-chromium contact-conducting rod assembly, and belongs to the technical field of copper-chromium contact manufacturing. The electron beam additive manufacturing method comprises the steps that S1, a special powder system is designed and prepared, specifically, contact area powder and conducting rod area powder are prepared and subjected to drying treatment; s2, digital modeling and support design: establishing an integrated copper-chromium contact-conducting rod assembly model by using three-dimensional software and slicing; S3, fusing and integrally forming by using an electron beam powder bed: printing an integrated copper-chromium contact-conducting rod assembly in a vacuum chamber of the electron beam powder bed, and S4, a printing post-treatment process is carried out, specifically, returning treatment, hot isostatic pressing treatment and machining treatment are carried out on the integrated copper-chromium contact-conducting rod assembly printed piece. According to the printing post-treatment process, the residual stress of the integrated copper-chromium contact-conducting rod assembly can be effectively eliminated through the printing post-treatment process; and the problems of macroscopic cracks and part warping caused by high residual thermal stress can be effectively avoided.

The invention relates to the technical field of additive manufacturing, in particular to a method for preparing a diamond / copper composite material layer by layer through electron beam surface printing. The diamond / copper composite material is obtained by adopting the arrangement that odd-numbered layers are diamond layers and even-numbered layers are copper powder layers, and adopting an electron beam surface exposure printing strategy for printing on the copper powder layers every time. The diamond / copper composite material is prepared through electron beam surface exposure printing, layer-by-layer alternate powder laying and copper powder layer melting, the problems that in the solid-phase sintering process, diamond distribution is uneven, and copper is difficult to fill evenly are solved, the step of material mixing is omitted, uneven material mixing caused by large physical property difference in the material mixing process is avoided, and the service life of the diamond / copper composite material is prolonged. The high-density and high-uniformity diamond / copper composite material is achieved, and the heat conductivity of the composite material is improved; and the efficiency and range of electron beam powder bed melting forming are improved, and heat management application industrial production can be achieved easily.

The invention belongs to the technical field of additive manufacturing, and discloses electron beam additive manufacturing equipment which comprises a forming chamber, a forming cylinder module, a powder laying platform, a scraper, a vacuumizing module and a cooling circulation module, the forming chamber is provided with a vacuumizing opening, a cooling medium inlet and a cooling medium outlet, and the forming cylinder module is arranged in the forming chamber; the forming cylinder module is provided with a printing cavity, the powder spreading platform is located at the top of the forming cylinder module, the scraper can slide relative to the powder spreading platform, and in the actual working process, the powder spreading platform is used for spreading metal powder, and the scraper is matched to achieve the powder spreading action. The vacuumizing module is connected with the vacuumizing opening, an output opening of the cooling circulation module penetrates through the cooling medium inlet through a circulation pipeline to communicate with the printing cavity, and a backflow opening of the cooling circulation module communicates with the cooling medium outlet. The electron beam additive manufacturing equipment is simple in structure, high in cooling efficiency and low in process gas consumption.

A method for preparing a wide-temperature-range constant-elasticity low-modulus titanium alloy based on additive manufacturing technology, relates to the field of electron beam additive manufacturing technology, and the method comprises the following steps: step 1, preparing an electron beam powder with a particle size of 30-150 microns; step 2, establishing a three-dimensional model of a printed metal part; step 3, adjusting the printing process parameters and scanning strategy, using an electron beam device for additive manufacturing, and directly obtaining a high-precision wide-temperature-range constant-elasticity titanium alloy. The wide-temperature-range constant-elasticity characteristics of the alloy prepared by the method can be directly generated by controlling the additive manufacturing process parameters, without subsequent processing, and the room-temperature elastic modulus is 35-55 GPa, and the elastic modulus remains unchanged in the temperature range of-50 DEG C to 200 DEG C. The method has the advantages of simple process steps, low production cost and short processing cycle, and has good application prospect in the fields of national defense, aerospace, precision machinery and the like.

The invention discloses a method for additive manufacturing of a diamond-M2 high-speed steel composite material. The method comprises the following steps: 1, plating a layer of metal film on the surface of a diamond particle; secondly, the coating diamond particles and M2 high-speed steel powder are mixed; thirdly, the mixed raw materials are put into a stock bin of electron beam additive manufacturing equipment, and layer cutting data and layer cutting scanning data are imported; and fourthly, a base plate is preheated, then powder laying and presintering are conducted, then melting scanning is conducted, layer-by-layer preparation is repeatedly conducted, finally solidification is conducted, and the diamond-M2 high-speed steel composite material is obtained. Diamond particles are added into M2 high-speed steel powder, and the composite material is prepared through electron beam additive manufacturing, so that diamond and carbide have a synergistic effect in the friction process, a wide and continuous wear-resistant layer is formed, the islanding effect of the diamond is effectively solved, the comprehensive performance of the obtained composite material is comprehensively improved, and the service life of the composite material is prolonged. The manufacturing period is short and the cost is low.

The invention provides a high-strength aluminum alloy welding wire for vacuum electron beam additive and a preparation method of the high-strength aluminum alloy welding wire. The preparation method comprises the following steps of (1) alloy element configuration, (2) preliminary smelting, (3) refining, (4) bar ingot casting, (5) thin bar hot extrusion, (6) heat treatment and (7) wire drawing. Wherein the alloy elements comprise aluminum, copper, magnesium, zinc, titanium, zirconium and scandium. Through the composite refining effect of Zr, Ti and rare earth Sc microelements, the aluminum alloy electron beam additive microstructure is refined, the mechanical property is improved, the strength of the aluminum alloy obtained after material adding is larger than 400 MPa, the strength of the aluminum alloy obtained after heat treatment is larger than 600 MPa, and no cracking phenomenon exists; by adding trace elements of Zr, Ti and rare earth Sc, the burning loss of low-melting-point elements is reduced, the consistency of an aluminum alloy electron beam additive structure is improved, and additive manufacturing application in a vacuum environment can be achieved.

The present invention provides a method for in-situ reaction preparation of submicron Nb5Si3 particle-reinforced Nb-based refractory high-entropy alloy by laser / electron beam. Nb-Si elemental composite quasi-spherical powder with an atomic ratio of 5:3 is used as raw material A. At the same time, Nb in the above traditional refractory two-phase alloy SS matrix alloy is designed into Nb(X,Y,Z...) refractory high-entropy alloy (where X,Y,Z... refer to elements such as Ti,Zr,Hf,Nb,Ta,Mo,V, etc.), and it is prepared into spherical powder B by rotating electrode atomization method; then the A+B mixed powder is used as raw material for laser / electron beam additive manufacturing, so as to prepare submicron Nb5Si3 particle-reinforced Nb(X,Y,Z...) refractory high-entropy alloy, and particle-reinforced refractory high-entropy alloy is prepared by in-situ reaction during laser or electron beam selective melting process.

The invention discloses a method for improving the low-temperature performance of an electron beam additive manufacturing Ti80 titanium alloy, and belongs to the technical field of additive manufacturing. According to the invention, the problem of low-temperature toughness and brittleness of the Ti80 titanium alloy manufactured by current electron beam fuse additive manufacturing is solved. According to the method, the titanium alloy manufactured through electron beam fuse additive manufacturing is heated to the temperature below the phase transformation point temperature for heat treatment, and the alpha-phase morphology, size and relative content of the Ti80 titanium alloy are regulated and controlled by adjusting the target temperature, the heat preservation time and the cooling speed. The Ti80 titanium alloy is prepared by adopting an electron beam fuse additive manufacturing technology, elements unfavorable for the low-temperature toughness of the titanium alloy are kept at an extremely low level, a foundation is laid for regulating and controlling the microstructure of the Ti80 titanium alloy through subsequent heat treatment, then thick primary alpha p is realized through heat treatment, a sufficient growth space is provided for low-temperature deformation twin crystals, and the high-temperature deformation twin crystals are obtained. The low-temperature toughness of the titanium alloy is improved. The method is simple in process, convenient to operate and high in generalization performance.

This invention discloses an electron beam additive manufacturing method for molybdenum-rhenium alloy based on positive defocus-induced in-situ recovery. Using electron beam additive manufacturing equipment and molybdenum-rhenium alloy powder as raw material, the method proceeds according to the following steps: 1. Establishing a vacuum environment and preheating the substrate; 2. Setting electron beam melting parameters, then scanning and melting the powder layer with the electron beam along a preset path, repeatedly laying powder layers and scanning to obtain a shaped part; after each powder layer is completely melted and before laying the next powder layer, the electron beam focusing state is adjusted to positive defocus, and the electron beam is used to scan the interlayer thermal compensation area of ​​the solidified region. This method, by introducing interlayer in-situ thermal compensation under positive defocus mode, constructs a thermal field distribution that facilitates the in-situ dynamic recovery of molybdenum-rhenium alloy during the electron beam powder bed melting process, achieving optimization of the microstructure and effective release of residual stress, avoiding brittle fracture of the additively manufactured component, and is applicable to fields such as nuclear energy engineering and aerospace.

This invention relates to the field of metal material processing technology, specifically to a method for optimizing the composition of high-strength and high-toughness aluminum-lithium alloys for additive manufacturing using rare earth synergistic refinement. The method includes the following steps: obtaining aluminum-lithium alloy matrix powder, and separately obtaining CeH2 powder as a cerium source and ZrH2 powder as a zirconium source as reaction precursors; uniformly mixing the CeH2 powder, ZrH2 powder, and aluminum-lithium alloy matrix powder to form a composite powder raw material; during electron beam additive manufacturing, based on the ultra-high temperature and ultra-high cooling rate environment provided by the molten pool formed on the composite powder raw material by high-energy beam scanning, CeH2 and ZrH2 decompose into highly active Ce atoms and Zr atoms, and promote the in-situ synthesis reaction between the two and molten aluminum to generate a (Ce,Zr)Al3 nanocomposite phase. This invention achieves spatiotemporal synchronization of refined phase generation and solidification nucleation by using CeH2 and ZrH2 as precursors to generate the (Ce,Zr)Al3 nanocomposite phase.

The application discloses a titanium-niobium alloy double-gradient material and a preparation method thereof, and belongs to the field of gradient material preparation. The application utilizes an electron beam additive manufacturing technology, controls the temperature of a powder bed, controls the precipitation quantity and distribution of an alpha" phase from a beta phase, forms double-gradient changes of the volume fraction and the elastic modulus of the precipitated phase along a preset direction, and finally successfully prepares the titanium-niobium alloy double-gradient material. The method is highly controllable, the combined action of the precipitation phase gradient and the elastic modulus gradient in the prepared double-gradient material significantly improves the impact resistance of the additive manufactured titanium alloy material, and the production is simple, the production cost is low, the efficiency is high, and the method has high further research and application values.

The invention relates to titanium alloy based on electron gun scanning oscillation and an additive manufacturing method thereof, and belongs to the technical field of metal additive manufacturing. According to the titanium alloy additive manufacturing method, after titanium alloy powder is subjected to vacuum degassing, electron beam additive manufacturing is conducted, the scanning track is a circular track or a sine curve track, the oscillation frequency and amplitude are controlled, and the titanium alloy is prepared. The titanium alloy prepared through the method has low porosity and high tensile strength and ductility, and anisotropy is remarkably reduced. The porosity of the titanium alloy is 0.5% or below, the tensile strength is 1000 MPa or above, the ductility is 12% or above, and the anisotropy is smaller than 5%.

The invention provides an electron beam multi-pole shoe coil deflection system control method based on an FOC algorithm. An electron beam multi-pole shoe deflection coil and a stator coil of a motor have similar structures, and high-precision control can be realized by using an FOC (Field-Oriented Control) algorithm in the field of the motor, so that the technology is introduced into an electron beam deflection control system, Park transformation special for an electron beam is designed, PI parameters are dynamically adjusted, and the control precision is improved. And a new idea is provided for an electron beam deflection control system. The whole FOC control process is detected through a back electromotive force observer, the position of an electron falling point is measured, and therefore closed-loop control is achieved. The measured position information of the drop point is compared with expected position information input by a user, and the FOC high-frequency scanning driving circuit can make corresponding adjustment according to the obtained difference error position information until the error position information is eliminated. The technology can be widely applied to the derivative fields of the electron beam industry, such as electron beam lithography, scanning electron microscope scanning, electron beam additive manufacturing (EBM) and the like, and has a good application prospect.

The invention relates to a device and a method for manufacturing a heterogeneous alloy structure through ultrasonic regulation and control electron beam additive manufacturing, in particular to an electron beam additive manufacturing device for feeding wires through a main shaft and a shaft side and regulating and controlling element diffusion and phase generation in combination with an ultrasonic field effect and a forming method of the electron beam additive manufacturing device. According to the electron beam + double-wire + ultrasonic synergetic additive manufacturing method and system, in the wire bundle coaxial cold cathode electron beam fuse additive manufacturing process, an ultrasonic auxiliary system is introduced to act on a forming base plate, dynamic regulation and control over the heterogeneous alloy element mixing behavior and the structure evolution process in a molten pool are achieved, and therefore the mechanical performance of the molten pool is improved. The problems of coarse grains, uneven structures and performance fluctuation in the heterogeneous alloy deposition process are solved, structure refinement and component homogenization are achieved, and the overall service performance of a deposition component is improved.

The invention discloses an electron beam current control device, a control method and electron beam additive manufacturing equipment. A data processing module performs interpolation or nonlinear discrete processing on original coordinate data and original process parameters and then generates a digital control signal; the controller converts a digital control signal into an analog control signal to drive the high-voltage power supply to enable the electron gun to generate an electron beam and drive the magnetic field excitation module to generate a magnetic field, and the feedback module collects a first feedback signal from the magnetic field excitation module and generates a second feedback signal based on a temperature diagram of a machining area. The data processing module calibrates the digital control signal based on the feedback signal, so that the whole process of data processing, control and feedback adjustment is free of human intervention, the feedback calibration control signal can be quickly responded, and the control signal can be automatically calibrated according to the feedback of the magnetic field excitation module and the feedback of a temperature diagram of an electron beam processing area. The control precision of the electron beam is improved, and the additive manufacturing quality is further improved.

The present invention discloses a numerical simulation method based on electron beam powder bed melting. According to the particle size distribution, powder layer thickness, and scraper movement speed of metal powder particles during powder spreading, a powder spreading simulation model of an electron beam additive manufacturing equipment is established. Through the powder spreading simulation model, a certain number of powder particles are generated. Under the action of the scraper, a powder bed model is obtained in the laying area. The powder bed model is extracted and a substrate is established below the model to obtain a discrete powder bed particle model. The heat transfer, mass transfer control equation of the powder bed particles under the action of the electron beam and the vapor recoil force are solved in the calculation domain of the discrete powder bed particle model to obtain the temperature field, morphology change, and forming quality of the molten pool. The present invention simulates the process of electron beam and powder particle coupling at the mesoscopic scale, numerically simulates the electron beam powder bed under multi-physical field coupling, and can provide guidance for the actual processing process by observing the temperature field and molten pool morphology under different process parameters.

The present application relates to a kind of multi-material electron beam additive manufacturing device.Multi-material electron beam additive manufacturing device includes sealed shell, first powder storage unit, second powder storage unit, forming unit, falling powder laying unit, single-arm powder laying unit, electron beam gun, first powder recycling unit and powder suction device.Sealed shell has working chamber and mounting chamber inside.Falling powder laying device is used to lay A powder material in first powder storage unit to forming cavity.Single-arm powder laying device is used to lay B powder material in second powder storage unit to forming cavity, and also used to push the excess B powder material outside forming cavity to second opening after B powder material laying is completed.Powder suction device is used to extract the powder dispersed in working chamber out of sealed shell after 3D printing of each material is completed.Multi-material electron beam additive manufacturing device realizes the overall forming of multi-material component, and solves the problems of multi-material cross contamination and material mixing that cannot be reused.

The present application relates to the technical field of metal material processing, in particular to a rare earth synergistic refining high-strength and high-toughness aluminum-lithium alloy composition optimization method for additive manufacturing, comprising the following steps: obtaining aluminum-lithium alloy base powder, and respectively obtaining CeH2 powder as a cerium source and ZrH2 powder as a zirconium source as reaction precursors; uniformly mixing the CeH2 powder, the ZrH2 powder and the aluminum-lithium alloy base powder to form a composite powder raw material; in an electron beam additive manufacturing process, based on the super-high temperature and super-high cooling rate environment provided by the molten pool formed on the composite powder raw material by high-energy beam scanning, the CeH2 and the ZrH2 are decomposed into high-activity Ce atoms and Zr atoms, and in-situ synthesis reactions of the two with molten aluminum are promoted to generate (Ce, Zr)Al3 nanocomposite phases. By using CeH2 and ZrH2 as precursors, (Ce, Zr)Al3 nanocomposite phases are generated, and the spatial and temporal synchronization of refined phase generation and solidification nucleation is realized.