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Y.M. Zhang, X.W. Yuan, W.G. Li, Z.M. Xiao, "Numerical Simulation of Thermal Behaviours in Laser Metal Deposition of Inconel 718", in B.H.V. Topping, P. Iványi, (Editors), "Proceedings of the Eleventh International Conference on Engineering Computational Technology", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 2, Paper 5.7, 2022, doi:10.4203/ccc.2.5.7

Keywords: additive manufacturing, laser metal deposition, melt pool, CFD model, void formation, solidification.

Abstract

Laser metal deposition (LMD) process is one of the advanced additive manufacturing techniques in which focused energy from a laser beam is used to fuse metallic powders to facilitate them being deposited on the metallic parts at the bottom. The LMD has its uniquely advantageous characteristics, such as small heat-affected zone fabricated, low dilution, and fast repair for metallic components. Although some research efforts has been put on the studies of the process parameters, design of super alloys and mechanical behaviors of components fabricated by the LMD, there is a dire lack of understanding on the thermal behaviours of the melt pool as well as the voids/pores formation during the LMD process. Therefore, in this study a CFD model is developed for the simulation of laser metal deposition of IN718 to investigate the thermal behaviors of melt pool and the potential defects in the clad. Validations on the shape and geometry of the melt pool are made by others’ experimental result, indicating that the proposed model is reliable and beneficial in predicting the dynamic behaviour of melt pool and the mass addition in the LMD process. Furthermore, several pores at the bottom of the clad were found in the simulation, it could be due to the absence of wetting behaviour during the solidification of the clad.

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Front Page Browse CCC CCP CSETS CTR IJRT Other Authors Search Purchase Guide FAQ Contact us	Civil-Comp Conferences ISSN 2753-3239 CCC: 2 PROCEEDINGS OF THE ELEVENTH INTERNATIONAL CONFERENCE ON ENGINEERING COMPUTATIONAL TECHNOLOGY Edited by: B.H.V. Topping and P. Iványi Paper 5.7 Numerical Simulation of Thermal Behaviours in Laser Metal Deposition of Inconel 718 Y.M. Zhang¹, X.W. Yuan¹, W.G. Li¹ and Z.M. Xiao² ¹College of Aerospace Engineering, Chongqing University Chongqing, China ²School of Mechanical and Aerospace Engineering Nanyang Technological University, Singapore doi:10.4203/ccc.2.5.7 Full Bibliographic Reference for this paper Y.M. Zhang, X.W. Yuan, W.G. Li, Z.M. Xiao, "Numerical Simulation of Thermal Behaviours in Laser Metal Deposition of Inconel 718", in B.H.V. Topping, P. Iványi, (Editors), "Proceedings of the Eleventh International Conference on Engineering Computational Technology", Civil-Comp Press, Edinburgh, UK, Online volume: CCC 2, Paper 5.7, 2022, doi:10.4203/ccc.2.5.7 Keywords: additive manufacturing, laser metal deposition, melt pool, CFD model, void formation, solidification. Abstract Laser metal deposition (LMD) process is one of the advanced additive manufacturing techniques in which focused energy from a laser beam is used to fuse metallic powders to facilitate them being deposited on the metallic parts at the bottom. The LMD has its uniquely advantageous characteristics, such as small heat-affected zone fabricated, low dilution, and fast repair for metallic components. Although some research efforts has been put on the studies of the process parameters, design of super alloys and mechanical behaviors of components fabricated by the LMD, there is a dire lack of understanding on the thermal behaviours of the melt pool as well as the voids/pores formation during the LMD process. Therefore, in this study a CFD model is developed for the simulation of laser metal deposition of IN718 to investigate the thermal behaviors of melt pool and the potential defects in the clad. Validations on the shape and geometry of the melt pool are made by others’ experimental result, indicating that the proposed model is reliable and beneficial in predicting the dynamic behaviour of melt pool and the mass addition in the LMD process. Furthermore, several pores at the bottom of the clad were found in the simulation, it could be due to the absence of wetting behaviour during the solidification of the clad. download the full-text of this paper (PDF, 6 pages, 374 Kb) go to the previous paper go to the next paper return to the table of contents return to the volume description
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