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Mass transfer and flow in additive manufacturing of a spherical component
journal contribution
posted on 2018-06-01, 00:00 authored by AmirMahyar KhorasaniAmirMahyar Khorasani, Ian GibsonIan Gibson, M Asadnia, W O NeillThis paper proposes a novel and coherent analysis of mass transfer and thermal stress flow (direction) in solidification of spherical components such as acetabular shells in selective laser melting of Ti-6Al-4 V. A detailed description of different phenomena such as solidification behaviour at the solid/liquid interface, behaviour of moving interface, thermal gradient, Gibbs free energy, interfacial energy and equilibrium temperature were utilised to characterise mass and thermal stress flow. Experimental results showed that thermal stress and mass flow on outer surfaces are higher than those found on inner surfaces which are related to the geometry and shape of the printed structures. Due to the mass transfer and thermal stress flow, built-up lines including a dent in the outer surfaces and grooves in the inner surfaces were observed with heights on the order of 200 μm. Post-processing is needed to remove the built-up lines which results in increasing dimensional deviations.
History
Journal
International Journal of Advanced Manufacturing TechnologyVolume
96Issue
9-12Pagination
3711 - 3718Publisher
Springer U KLocation
London, Eng.Publisher DOI
ISSN
0268-3768eISSN
1433-3015Language
engPublication classification
C Journal article; C1 Refereed article in a scholarly journalCopyright notice
2017, Springer-Verlag LondonUsage metrics
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