| 常珂,梁晨光,易敏.基于离散元与相场法的激光选区熔化数值模拟[J].计算力学学报,2024,41(5):830~836 |
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| 基于离散元与相场法的激光选区熔化数值模拟 |
| Numerical simulation of selective laser melting by combining discrete element method and phase-field method |
| 投稿时间：2023-11-23 修订日期：2023-12-15 |
| DOI：10.7511/jslx20231123003 |
| 中文关键词: 激光选区熔化 铺粉 相场法 熔池 微结构演化 |
| 英文关键词:selective laser melting powder spreading phase-field method molten pool microstructure evolution |
| 基金项目:国家重点研发青年科学家项目(2022YFB4600700);国家科技重大专项(J2019-IV-0014-0082);国家青年人才项目资助. |
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| 中文摘要: |
| 在激光选区熔化制造过程中,多物理场耦合特征明显,涉及传热、相变、熔池流动以及晶粒生长等复杂的物理现象,给质量调控带来了极大挑战。本文基于离散元法与相场法,提出了集成粉床-熔池-微结构演化的计算框架,实现激光选区熔化的高保真数值模拟。首先,采用离散元模拟了辊筒铺粉过程,讨论了铺粉工艺参数对粉床质量的影响;其次,提出了热-流-微结构耦合的非等温相场模型,验证了相场模拟计算研究熔池气液两相流动行为的可行性,并研究了反冲压力和马兰戈尼效应对熔池行为的影响;最后,实现了铺粉-单层扫描的全过程仿真,再现了激光选区熔化过程中熔池的流动、凝固以及晶粒演化等现象。 |
| 英文摘要: |
| 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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