On the role of thermal fluid dynamics into the evolution of porosity during selective laser melting

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Colleges, School and Institutes

Abstract

Thermal fluid dynamics and experiments have been used to study the evolution of pores during selective laser melting of Ti-6Al-4V. Scanning electron micrographs show that the morphology of pores changed from near-spherical to elongated shape as the laser scan speed increased. Computational fluid dynamics suggests that this is caused by the change of flow pattern in the melt pool which is dictated by forces such as vapour pressure, gravitational force, capillary and thermal capillary forces exerted on the metallic/gaseous interface.

Details

Original languageEnglish
Pages (from-to)14-17
Number of pages4
JournalScripta Materialia
Volume105
Early online date29 Apr 2015
Publication statusPublished - Aug 2015

Keywords

  • Porosity, Selective laser melting, Thermal fluid dynamics, Ti-6Al-4V