Research On The Construction And Properties Of AlSi10Mg Lattice Structure Based On Laser Selective Melting Technology

Satellite industry is one of the most challenging high-tech fields in the world today.Due to the high cost of manufacturing and launching,satellites are gradually becoming miniaturized.Micro-nano satellite is small in size and complex in structure,so it is difficult to manufacture by traditional manufacturing methods.In addition,the structure of micro-nano satellite is basically made of solid materials with high density.Therefore,in this paper,selective laser melting technology is used to manufacture lattice structure materials,and new lattice structure materials are used to replace traditional materials,which reduces the maching difficulty and launch cost of micro-nano satellite.Firstly,four kinds of lattice structures are analyzed,and the vertex structure is selected as the research type of this paper by comparing density and mechanical properties.In order to predict the influence of rod diameter size on performance of lattice structure,a numerical simulation method is designed to analyze the size and mechanics of single rod of lattice structure.The effects of aspect ratio of rod on density,elastic modulus and initial collapse strength are studied by numerical simulation.Compared with previous studies,the numerical simulation results in this paper are more close to the actual situation,especially the large aspect ratio range,and the prediction effect is better.Then,the formability and mechanical properties of several typical materials used in the aerospace field are analyzed.In order to study the influence of layer thickness on the properties of AlSi10Mg aluminum alloy by laser selective melting,orthogonal test are carried out on AlSi10Mg aluminum alloy powder developed independently in China.The orthogonal test combination of laser power and scanning speed is selected to form a batch of samples with different layer thickness.In order to select the best molding parameters,density,microstructure and mechanical properties are studied.The results show that when the thickness of the layer is 50μm,the density is greater than 99%,the roughness is less than 9μm,the average hardness is 136.075HV,the tensile strength is 368MPa,and the build rate is about 1.5 times of that before.The experimental results show that the manufacturing efficiency is greatly improved while maintaining the same performance.Finally,the lattice structure is fabricated by laser selective melting technology,and the dimensional accuracy and performance of the lattice structure are studied.In order to select the rod diameter of lattice structures,the formability of lattice structures with different rod diameters is explored,and the dimensional accuracy,microstructure and mechanical properties of the lattice structures are characterized.The experimental results show that the lattice structure and the single rod have relatively high dimensional accuracy.The rod diameter of 1000μm has the minimum roughness,the density is more than 50%,the average hardness value is 137.188HV,and the compression performance is 155MPa.In addition,in this paper,the maching and tensile experiments of single rod are carried out,and the elastic modulus is obtained for numerical simulation.The tensile samples of lattice structures are designed and tested,and the relationship between the tensile properties of lattice structures and rod diameters is obtained.