Numerical Simulation of Melt Pool Evolution in Selective Laser Melting of IN718 Alloy
Utilizing a combined discrete element method(DEM)and volume of fluid(VOF)approach,effects of laser power on the melt pool size and formation mechanisms of evolution and morphology of IN718 during selective laser melting(SLM)were investigated through numerical simulation and experimental validation.The results reveal that with an increase in laser power,the melt pool size is gradually enlarged and the continuity and size uniformity of the melt pool is improved.Optimal melt track morphology is achieved at specific process parameters(P=200 W,v=1.5 m/s).The surface tension gradient induced by the temperature gradient,coupled with the vapor recoil pressure,jointly drive the evolution of the melt pool and the formation of the melt track.Optimizing the interlayer rotation angle(θ= 67°)can reduce the probability of pore defects at the ends of the melt tracks.
Selective Laser MeltingIN718 AlloyMelt Pool EvolutionNumerical Simulation
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