Temperature Field Simulation And Performance Study Of TC4 Titanium Alloy Prepared By Electron Beam Selective Melting

Electron beam selective melting(EBSM)is a 3D metal printing technology that has developed rapidly in recent years.It is a non-polluting,high energy density electron beam heat source for vacuum processing,especially in complex shapes and high energy density.The advantages in the field of precision parts manufacturing have made it increasingly widely used in fields such as aerospace,medical equipment,and medical implants.Different process parameters used during processing will affect the temperature field of the additive manufacturing process.However,under the current test conditions,the use of test methods to accurately grasp the instantaneous temperature field changes in the additive manufacturing process is difficult.Therefore,this article first uses ANSYS finite element analysis software to numerically simulate the temperature field of electron beam selective melting,and analyze the influence of electron beam processing power and electron beam scanning speed on the temperature field of electron beam additive manufacturing.The results show that the EBSM processing process With the increase of the scanning track and the number of layers,the heat accumulation effect will become more obvious.The first layer of metal powder will increase the initial temperature of the next layer during the scanning process,but the latter layer of metal powder The thermal effect on the previous layer of metal powder will be greater,and even the previous layer of metal powder can undergo a remelting.The temperature of the molten pool is also increasing with the increase of the number of scans.Under the process parameters of electron beam power of 1500 W,scanning speed of 1500mm/s,electron beam spot diameter of 0.5mm,and scanning distance of 0.2mm,the maximum temperature of the molten pool is controlled at about 2200??2800?,and the temperature field simulation results are the most ideal status.This process parameter was selected to compare the mechanical properties of TC4 titanium alloy prepared by EBSM method with horizontal printing H group and vertical printing V group with TC4 titanium alloy prepared by(?+?)forging method.The average tensile strength of TC4 titanium alloy in group H prepared by EBSM method reached 986 MPa,the average yield strength reached 880 MPa,the elongation reached 11.2%,the fracture mode was plastic fracture,and the metallographic microstructure was mesh basket structure,so the mechanical properties were better..The average tensile strength of group V TC4 titanium alloy reaches 783 MPa,the average yield strength reaches 742.7MPa,the elongation is poor,only 8.8%,the fracture mode is plastic fracture,and the metallographic microstructure is Widmanstatten structure,so the mechanical properties are poor.Not as good as Group H.(?+?)The average tensile strength of group F TC4 titanium alloy prepared by forging reaches995 MPa,the average yield strength reaches 943 MPa,the elongation is better,reaching15.3%,the fracture mode is plastic fracture,and the metallographic microstructure is equiaxed The organization and mechanical properties are the most excellent.(?+?)The comprehensive mechanical properties of TC4 titanium alloy prepared by forging are better than those of TC4 titanium alloy prepared by EBSM method.