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ISSN Online: 2688-7231

ISBN Online: 978-1-56700-524-0

Proceedings of the 26thNational and 4th International ISHMT-ASTFE Heat and Mass Transfer Conference December 17-20, 2021, IIT Madras, Chennai-600036, Tamil Nadu, India
December, 17-20, 2021, IIT Madras, Chennai, India

Micro-scale solidification and micro-segregation during laser spot melting of binary alloys

Get access DOI: 10.1615/IHMTC-2021.630
pages 419-423

Abstract

Selective laser melting is a laser based additive manufacturing process in which both melting and solidification play essential roles. In this paper, we present a numerical model for simultaneous melting and micro-scale solidification of a binary alloy sample during the laser melting process. The model is developed by making appropriate modifications to the governing equations of momentum, energy and species conservation based on the well-known enthalpy method. The effect of the fixed laser source is incorporated as a heat flux term at the top surface. Natural convection and Marangoni convection are implemented in the model. Powder effect is considered by effective thermal conductivity which is defined as a function of the porosity of the powder bed. This paper mainly emphasises the dendrite growth and microsegregation in binary alloys during a laser melting process.
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