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Microstructural and mechanical characterization of thin-walled tube manufactured with selective laser melting for stent application

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journal contribution
posted on 11.01.2021, 14:29 by Enzoh LangiEnzoh Langi, Liguo ZhaoLiguo Zhao, P Jamshidi, M Attallah, Vadim SilberschmidtVadim Silberschmidt, Helen WillcockHelen Willcock, F Vogt
This paper focuses on microstructural and mechanical characterisation of metallic thin-walled tube produced with additive manufacturing (AM), as a promising alternative technique for the manufacturing of tubes as a feedstock for stents micromachining. Tubes, with a wall thickness of 500 μm, were made of 316L stainless steel using selective laser melting (SLM). Its surface roughness, constituting phases, underlying microstructures and chemical composition were analysed. The dependence of hardness and elastic modulus on the crystallographic orientation were investigated using electron backscatter diffraction and nanoindentation. Spherical nanoindentation was performed to extract the indentation stress-strain curve from the loaddisplacement data. The obtained results were compared with those for a commercial 316L stainless steel stent. Both tube and commercial stent samples were fully austenitic, and the as-fabricated surface finish for the tube was much rougher than the stent. Microstructural characterisation revealed that the tube had a columnar and coarse grain microstructure, compared to equiaxed grains in the commercial stent. Berkovich nanoindentation suggested an effect for the grain orientation on the hardness and Young’s modulus. The stress-strain curves and the indentation yield strength for the tube and stent were similar. The work is an important step towards AM of patient-specific stents.

Funding

Smart Peripheral Stents for the Lower Extremity - Design, Manufacturing and Evaluation

Engineering and Physical Sciences Research Council

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History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering
  • Mechanical, Electrical and Manufacturing Engineering

Department

  • Materials

Published in

Journal of Materials Engineering and Performance

Volume

30

Issue

1

Pages

696 - 710

Publisher

Springer Verlag

Version

VoR (Version of Record)

Rights holder

© The authors

Publisher statement

This is an Open Access Article. It is published by Springer under the Creative Commons Attribution 4.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/

Acceptance date

14/11/2020

Publication date

2021-01-04

ISSN

1059-9495

Language

en

Depositor

Prof Liguo Zhao. Deposit date: 15 November 2020