TY - JOUR
T1 - Mass transfer and flow in additive manufacturing of a spherical component
AU - Khorasani, Amir Mahyar
AU - Gibson, Ian
AU - Asadnia, Mohsen
AU - O'Neill, William
PY - 2018/6
Y1 - 2018/6
N2 - This 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.
AB - This 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.
KW - Additive manufacturing
KW - Mass transfer
KW - Selective laser melting
KW - Solidification
KW - Thermal stress
UR - http://www.scopus.com/inward/record.url?scp=85043688548&partnerID=8YFLogxK
U2 - 10.1007/s00170-017-1483-7
DO - 10.1007/s00170-017-1483-7
M3 - Article
AN - SCOPUS:85043688548
SN - 0268-3768
VL - 96
SP - 3711
EP - 3718
JO - International Journal of Advanced Manufacturing Technology
JF - International Journal of Advanced Manufacturing Technology
IS - 9-12
ER -