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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:
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
作者单位邮编
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 
210016
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 
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 
210016
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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 single layer is realized, which reproduces the phenomena of molten pool flow, solidification and grain evolution during SLM process.
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