Numerical simulation of selective laser melting by combining discrete element method and phase-field method
Multi-physics coupling is a key characteristic of selective laser melting(SLM),involving complex physical phenomena such as heat transfer,phase transition,molten pool flow,and grain growth,which raise great challenges for quality control.In this paper,we propose a computational framework integrating the discrete element method(DEM)and phase-field method(PFM)to achieve high-fidelity numerical simulation of SLM.Firstly,the powder spreading process is simulated by DEM,and the effect of powder spreading parameters on the quality of the powder-bed layer is discussed.Secondly,a non-isothermal phase-field model including heat-fluid-microstructure coupling is presented,which is verified by the benchmark case of the gas-liquid two-phase flow behavior.In addition,the influence of recoil pressure and Marangoni effect on the molten pool behavior is studied.Finally,the whole process simulation of powder spreading and laser scanning of a single layer is realized,which reproduces the phenomena of molten pool flow,solidification and grain evolution during SLM process.
万方数据
维普
