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Page d'accueil Archives Thermal Letter Responsables Réunions à venir Assembly for International Heat Transfer Conferences

ISBN Imprimer: 978-1-56700-474-8

ISSN: 2377-424X

ISBN En ligne: 978-1-56700-473-1

International Heat Transfer Conference 16
August, 10-15, 2018, Beijing, China

INVESTIGATION ON THE EFFECT OF THE MAGNETIC FORCE ON THE MELT POOL EVOLUTION AND SURFACE SHRINK USING A DEVELOPED MODEL

Get access DOI: 10.1615/IHTC16.mpf.023528
pages 6487-6494

Résumé

The control of evolution of flow and heat transfer in melt pool is a key concern and hot topic to improve the produce quality, e.g. fissure and roughness, during the additive manufacture process. Researchers focus on controlling the evolution of melt pool by changing energy balance in melt pool. However, the momentum, as the other main factor driving melt pool evolution, is seldom presented in literatures but fully necessary to further improve the control efficiency. Therefore, a promising magnetic force source is introduced to investigate the controlling effect on melt pool evolution. Based on a developed and validated 2D multiphase flow model, the evolution results of melt pool under three different magnetic intensity conditions are obtained and analyzed by comparing with the solution without magnetic force effect. In addition, the surface shrink characteristics during quenching process are investigated to further evaluate benefit of the added source. Results show that the melt pool evolution is significantly affected by the additional magnetic force. The increasing magnetic force makes the surface deformation larger, the convection becomes vigorous and the melt pool dimension also increases. During quenching process, the surface roughness is continuously reduced with a certain increase of the magnetic intensity because of the increased melt pool duration and slightly vigorous surface flow. However, the effectiveness becomes bad as the magnetic force exceeds a critical value due to the induced shrink instability.
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