Numerical and experimental studies of molten pool formation during an interaction of a pulse laser (Nd:YAG) with a magnesium alloy |
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| Authors: | Kamel Abderrazak Wassim Kriaa Wacef Ben Salem Hatem Mhiri Georges Lepalec Michel Autric |
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| Institution: | 1. Unité de Thermique et Thermodynamique des Procédés Industriels, Ecole Nationale d’Ingénieurs de Monastir, Avenue Ibn El Jazzar, 5019 Monastir, Tunisia;2. Laboratoire de Génie Mécanique, Ecole Nationale d’Ingénieurs de Monastir, Avenue Ibn Jazzar, 5019 Monastir, Tunisia;3. Institut de Mécanique de Marseille, 60, rue Joliot-Curie, Technopôle de Château-Gombert, 13453 Marseille Cedex 13, France;1. School of Materials Science and Engineering, Dalian University of Technology, No. 2 Linggong Road, Ganjingzi District, Dalian 116023, China;2. Key Laboratory for Solar Energy Photovoltaic System of Liaoning Province, Dalian 116023, China;1. Innovation Engineering Department, University of Salento, Via per Arnesano s.n., 73100 Lecce, Italy;2. DMMM, Politecnico di Bari, Viale Japigia 182, Bari, Italy;3. Institute of Engineering and Energy Technologies, University of the West of Scotland, Paislae PA1 2BE, Scotland, UK;1. Shanghai Key Laboratory of Materials Laser Processing and Modification, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai, 200240, PR China;1. Joining and Welding Research Institute (JWRI), Osaka University, 11-1 Mihogaoka, Ibaraki, Osaka 567-0047, Japan;2. Murata Welding Laboratories, Ltd, 532-0012 Osaka, Yodogawaku 4-6-11, Japan;3. Shanghai Key Laboratory of Material Laser Processing and Modification (Shanghai Jiao Tong University), Shanghai 200240, PR China |
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| Abstract: | A pulse laser (Nd:YAG) interaction with an AZ91 magnesium alloy has been experimentally and numerically studied. A two-dimensional (2D) axisymmetric model of a molten pool created by a laser heat source has been developed. The elaborated model solves the coupled equations of a laminar fluid flow and heat transfer to demonstrate the flow behavior in the pool. This model takes into account the coupled effects of buoyancy and Marangoni forces, the thermophysic variation properties with temperature, and the radiation and convection heat losses. Concerning numerical results, the molten temperature distribution, velocity field and molten shape were discussed. It was noted that the Marangoni flow significantly alters the characteristics of the thawing and solidifying processes, and makes the molten pool wider and shallower. On the other hand, the experimental results showed that the material thermal properties have significant effects on the transport phenomena which takes place in the molten pool, and consequently on the formation as well as the shape of the pool. Finally, a comparison between the numerical and experimental results exhibited a good agreement. |
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