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| Numerical simulation of selective laser melting by combining discrete element method and phase-field method |
| Received:November 23, 2023 Revised:December 15, 2023 |
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| DOI：10.7511/jslx20231123003 |
| KeyWord:selective laser melting powder spreading phase-field method molten pool microstructure evolution |
| Author | Institution |
| 常珂 |
南京航空航天大学 航空学院&航空航天结构力学及控制全国重点实验室, 南京 |
| 梁晨光 |
南京航空航天大学 航空学院&航空航天结构力学及控制全国重点实验室, 南京 |
| 易敏 |
南京航空航天大学 航空学院&航空航天结构力学及控制全国重点实验室, 南京 |
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| Abstract: |
| 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. |
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