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dc.contributor.authorAli, Usman
dc.contributor.authorMahmoodkhani, Yahya
dc.contributor.authorImani Shahabad, Shahriar
dc.contributor.authorEsmaeilizadeh, Reza
dc.contributor.authorLiravi, Farzad
dc.contributor.authorSheydaeian, Esmat
dc.contributor.authorHuang, Ke Yin
dc.contributor.authorMarzbanrad, Ehsan
dc.contributor.authorVlasea, Mihaela
dc.contributor.authorToyserkani, Ehsan 15:34:01 (GMT) 15:34:01 (GMT)
dc.descriptionThe final publication is available at Elsevier via © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
dc.description.abstractExperimental studies in the literature have identified the powder-bed compaction density as an important parameter, governing the quality of additively manufactured parts. For example, in laser powder-bed fusion (LPBF), the powder-bed compaction density directly affects the effective powder thermal conductivity and consequently the temperature distribution in melt pool. In this study, this physical parameter in a LPBF build compartment is measured using a new methodology. A UV curable polymer is used to bind powder-bed particles at various locations on the powder-bed compartment when Hastelloy X was used. The samples are then scanned using a nano-computing tomography (CT) system at high resolution to obtain an estimation of the relative powder-bed compaction density. It is concluded that due to the interaction between the recoater and the variation in the powder volume accumulated ahead of the recoater across the build compartment, the relative powder-bed compaction density decreases along the recoater moving direction (from 66.4% to 52.4%.). This variation in the powder-bed compaction density affects the density and surface roughness of the final printed parts that is also investigated. Results show that the part density and surface quality decrease ~0.25% and ~20%, respectively, along the build bed in direction of the recoater motion.en
dc.description.sponsorshipNatural Sciences and Engineering Research Council of Canada (NSERC) Federal Economic Development Agency for Southern Ontario (FedDev Ontario)en
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.subjectAdditive manufacturingen
dc.subject3D printingen
dc.subjectCompaction densityen
dc.subjectSelective laser meltingen
dc.subjectLaser powder-bed fusionen
dc.subjectHastelloy Xen
dc.titleOn the measurement of relative powder-bed compaction density in powder-bed additive manufacturing processesen
dcterms.bibliographicCitationAli, U., Mahmoodkhani, Y., Imani Shahabad, S., Esmaeilizadeh, R., Liravi, F., Sheydaeian, E., … Toyserkani, E. (2018). On the measurement of relative powder-bed compaction density in powder-bed additive manufacturing processes. Materials & Design, 155, 495–501.
uws.contributor.affiliation1Faculty of Engineeringen
uws.contributor.affiliation2Mechanical and Mechatronics Engineeringen

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