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Towards understanding side-skin surface characteristics in laser powder bed fusion

Published online by Cambridge University Press:  03 June 2020

Sagar Patel ,
Allan Rogalsky  and
Mihaela Vlasea
Sagar Patel
Affiliation:
Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, ONN2L 3G1, Canada
Allan Rogalsky
Affiliation:
Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, ONN2L 3G1, Canada
Mihaela Vlasea*
Affiliation:
Department of Mechanical and Mechatronics Engineering, University of Waterloo, Waterloo, ONN2L 3G1, Canada
*
a)Address all correspondence to this author. e-mail: mihaela.vlasea@uwaterloo.ca
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Abstract

Additively manufactured parts produced via laser powder bed fusion (LPBF) have limitations in their applications due to post-processing requirements caused by high surface roughness. The characteristics of side-skin surfaces are generally assumed to be dominated by adhered powder particles. This work aims to analyze and interpret the effects of LPBF processing parameters on side-skin surfaces. As such, this work has two sections to investigate the effect of (i) core and (ii) border LPBF parameters on side-skin surface roughness for Ti–6Al–4V. The findings show that there is a robust correlation between both core and border LPBF parameters on side-skin surface morphologies. In terms of core LPBF parameters, an interaction between laser power and beam velocity is shown to influence side-skin surface roughness, resulting in Sa values in the range of 11–26 μm. Additionally, a preliminary investigation into the effect of melting mode phenomena at the border leads to a possibility of obtaining Sa values of <10 μm, with reduced effects of adhered and partially fused powder.

Keywords

lasermorphologyalloy

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Type
Invited Paper
Information
Journal of Materials Research , Volume 35 , Issue 15: Focus Issue: Additive Manufacturing of Metals: Complex Microstructures and Architecture Design , 14 August 2020 , pp. 2055 - 2064
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Copyright © Materials Research Society 2020

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