On the role of melt flow into the surface structure and porosity development during selective laser melting

Qiu, Chunlei; Panwisawas, Chinnapat; Ward, Robin; Basoalto, Hector; Brooks, J.W.; Attallah, Moataz M.

doi:10.1016/j.actamat.2015.06.004

articleActa MaterialiaJun 12, 2015HYBRID OA

On the role of melt flow into the surface structure and porosity development during selective laser melting

CQChunlei Qiu CPChinnapat Panwisawas RWRobin Ward HBHector Basoalto JBJ.W. Brooks

University of Birmingham

Indexed incrossref

Abstract

In this study, the development of surface structure and porosity of Ti–6Al–4V samples fabricated by selective laser melting under different laser scanning speeds and powder layer thicknesses has been studied and correlated with the melt flow behaviour through both experimental and modelling approaches. The as-fabricated samples were investigated using optical microscopy (OM) and scanning electron microscopy (SEM). The interaction between laser beam and powder particles was studied by both high speed imaging observation and computational fluid dynamics (CFD) calculation. It was found that at a high laser power and a fixed powder layer thickness (20 μm), the samples contain particularly low porosity when the…

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Topics & keywords

Topics

Keywords

Materials science
Porosity
Scanning electron microscope
Selective laser melting
Surface roughness
Composite material
Laser
Laser scanning

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