Pityana, Sisa LTlotleng, MonnammeTshabalala, Lerato CMakoana, Nkutwane WBotes, AHachemi Amara, EL2017-05-122017-05-122016-11Pityana, S.L., Tlotleng, M., Tshabalala, L.C., Makoana, N.W., Botes, A. and Hachemi Amara, E.L. 2016. Multiphysics simulation of thermal phenomena in direct laser metal powder deposition:In 17th Annual Conference of the Rapid Product Development Association of South Africa, 2-4 November 2016, Vaal University of Technology pp 14http://conferences.sun.ac.za/index.php/rapdasa17/rapdasa17/paper/view/2662http://hdl.handle.net/10204/9005Due to copyright restrictions, the attached PDF file only contains the abstract of the full text item. For access to the full text item, please consult the publisher's websiteThe direct laser metal deposition (DLMD) is a recently developed technique for manufacturing solid parts, layer by layer, directly from powder. The process uses a high power laser beam focused onto a metallic substrate to generate a molten pool to which a stream of powder is fed. This way, the material volume increases leading to the formation of a solid layer. The laser beam and powder nozzle are repeatedly scanned to accomplish a layered buildup of a solid part by additive manufacturing. The key process parameters are laser power, scan speed, laser beam diameter, and powder feed rate. The parameters influence the thermal phenomena during the growth process of the solid part as well as the metallurgical and mechanical properties. This paper presents on two dimensional multi-physics models to describe the physical mechanism of heat transfer, melting and solidification that take place during and post laser-powder interaction. The simulated transient temperature profile, the geometrical features of the generated structures and thermal cycles are presented. The transient temperature history is critically important for determining the thermal stress distribution and residual stress state in additively manufactured parts. The results obtained from the model generated by COMSOL Multiphysics software provide the basis for the selection of the process parameters in additive manufacturing.enLaser additive manufacturingMulti-physics modellingTemperature fieldsConference PresentationPityana, S. L., Tlotleng, M., Tshabalala, L. C., Makoana, N. W., Botes, A., & Hachemi Amara, E. (2016). Multiphysics simulation of thermal phenomena in direct laser metal powder deposition. http://hdl.handle.net/10204/9005Pityana, Sisa L, Monnamme Tlotleng, Lerato C Tshabalala, Nkutwane W Makoana, A Botes, and EL Hachemi Amara. "Multiphysics simulation of thermal phenomena in direct laser metal powder deposition." (2016): http://hdl.handle.net/10204/9005Pityana SL, Tlotleng M, Tshabalala LC, Makoana NW, Botes A, Hachemi Amara E, Multiphysics simulation of thermal phenomena in direct laser metal powder deposition; 2016. http://hdl.handle.net/10204/9005 .TY - Conference Presentation AU - Pityana, Sisa L AU - Tlotleng, Monnamme AU - Tshabalala, Lerato C AU - Makoana, Nkutwane W AU - Botes, A AU - Hachemi Amara, EL AB - The direct laser metal deposition (DLMD) is a recently developed technique for manufacturing solid parts, layer by layer, directly from powder. The process uses a high power laser beam focused onto a metallic substrate to generate a molten pool to which a stream of powder is fed. This way, the material volume increases leading to the formation of a solid layer. The laser beam and powder nozzle are repeatedly scanned to accomplish a layered buildup of a solid part by additive manufacturing. The key process parameters are laser power, scan speed, laser beam diameter, and powder feed rate. The parameters influence the thermal phenomena during the growth process of the solid part as well as the metallurgical and mechanical properties. This paper presents on two dimensional multi-physics models to describe the physical mechanism of heat transfer, melting and solidification that take place during and post laser-powder interaction. The simulated transient temperature profile, the geometrical features of the generated structures and thermal cycles are presented. The transient temperature history is critically important for determining the thermal stress distribution and residual stress state in additively manufactured parts. The results obtained from the model generated by COMSOL Multiphysics software provide the basis for the selection of the process parameters in additive manufacturing. DA - 2016-11 DB - ResearchSpace DP - CSIR KW - Laser additive manufacturing KW - Multi-physics modelling KW - Temperature fields LK - https://researchspace.csir.co.za PY - 2016 T1 - Multiphysics simulation of thermal phenomena in direct laser metal powder deposition TI - Multiphysics simulation of thermal phenomena in direct laser metal powder deposition UR - http://hdl.handle.net/10204/9005 ER -