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Experimental and numerical investigation of selective laser melting–induced defects in Ti–6Al–4V octet truss lattice material: the role of material microstructure and morphological variations

Published online by Cambridge University Press:  29 April 2020

Asma El Elmi ,
David Melancon ,
Meisam Asgari ,
Lu Liu  and
Damiano Pasini
Asma El Elmi
Affiliation:
Mechanical Engineering Department, McGill University, Montreal, Quebec H3A 0C3, Canada
David Melancon
Affiliation:
John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts, USA
Meisam Asgari
Affiliation:
School of Engineering and Applied Science, Northwestern University, Evanston, Illinois, USA; and Mechanical Engineering Department, McGill University, Montreal, Quebec H3A 0C3, Canada
Lu Liu
Affiliation:
Mechanical Engineering Department, McGill University, Montreal, Quebec H3A 0C3, Canada
Damiano Pasini*
Affiliation:
Mechanical Engineering Department, McGill University, Montreal, Quebec H3A 0C3, Canada
*
a)Address all correspondence to this author. e-mail: damiano.pasini@mcgill.ca
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Abstract

The remarkable progress in additive manufacturing has promoted the design of architected materials with mechanical properties that go beyond those of conventional solids. Their realization, however, leads to architectures with process-induced defects that can jeopardize mechanical and functional performance. In this work, we investigate experimentally and numerically as-manufactured defects in Ti–6Al–4V octet truss lattice materials fabricated with selective laser melting. Four sets of as-manufactured defects, including surface, microstructural, morphological, and material property imperfections, are characterized experimentally at given locations and orientations. Within the characterized defects, material property and morphological defects are quantified statistically using a combination of atomic force microscopy and micro–computed tomography to generate representative models that incorporate individual defects and their combination. The models are used to assess the sensitivity to as-manufactured defects. Then, the study is expanded by tuning defects amplitude to elucidate the role of the magnitude of as-designed defects on the mechanical properties of the lattice material.

Keywords

cellular (material form)additive manufacturingdefects

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Type
Article
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Journal of Materials Research , Volume 35 , Issue 15: Focus Issue: Additive Manufacturing of Metals: Complex Microstructures and Architecture Design , 14 August 2020 , pp. 1900 - 1912
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Copyright © Materials Research Society 2020

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