Microstructural and Mechanical Characterization of Thin-Walled Tube Manufactured with Selective Laser Melting for Stent Application

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Microstructural and Mechanical Characterization of Thin-Walled Tube Manufactured with Selective Laser Melting for Stent Application. / Langi, E.; Zhao, L. G.; Jamshidi, P.; Attallah, M. M.; Silberschmidt, V. V.; Willcock, H.; Vogt, F.

In: Journal of Materials Engineering and Performance, 2021.

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@article{0e39545efcb04de7b3a5e709238fecae,
title = "Microstructural and Mechanical Characterization of Thin-Walled Tube Manufactured with Selective Laser Melting for Stent Application",
abstract = "This paper focuses on microstructural and mechanical characterization 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. Its surface roughness, constituting phases, underlying microstructures and chemical composition were analyzed. 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 load–displacement 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 characterization 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{\textquoteright}s modulus. The stress–strain curves and the indentation yield strength for the tube and stent were similar. The work is an important step toward AM of patient-specific stents.",
keywords = "additive manufacturing, material microstructure, mechanical properties, metallic stents, nanoindentation, selective laser melting",
author = "E. Langi and Zhao, {L. G.} and P. Jamshidi and Attallah, {M. M.} and Silberschmidt, {V. V.} and H. Willcock and F. Vogt",
note = "Funding Information: We acknowledge the support from the EPSRC UK (Grant Number: EP/R001650/1; Title: Smart peripheral stents for the lower extremity–design, manufacturing and evaluation). The authors acknowledge the use of facilities within the Loughborough Materials Characterisation Centre of Loughborough University. Research data for this paper are available upon request to the projects{\textquoteright} principal investigator Professor Liguo Zhao at Loughborough University, UK (email: L.Zhao@Lboro.ac.uk). Publisher Copyright: {\textcopyright} 2020, The Author(s). Copyright: Copyright 2020 Elsevier B.V., All rights reserved.",
year = "2021",
doi = "10.1007/s11665-020-05366-9",
language = "English",
journal = "Journal of Materials Engineering and Performance",
issn = "1059-9495",
publisher = "ASM International",

}

RIS

TY - JOUR

T1 - Microstructural and Mechanical Characterization of Thin-Walled Tube Manufactured with Selective Laser Melting for Stent Application

AU - Langi, E.

AU - Zhao, L. G.

AU - Jamshidi, P.

AU - Attallah, M. M.

AU - Silberschmidt, V. V.

AU - Willcock, H.

AU - Vogt, F.

N1 - Funding Information: We acknowledge the support from the EPSRC UK (Grant Number: EP/R001650/1; Title: Smart peripheral stents for the lower extremity–design, manufacturing and evaluation). The authors acknowledge the use of facilities within the Loughborough Materials Characterisation Centre of Loughborough University. Research data for this paper are available upon request to the projects’ principal investigator Professor Liguo Zhao at Loughborough University, UK (email: L.Zhao@Lboro.ac.uk). Publisher Copyright: © 2020, The Author(s). Copyright: Copyright 2020 Elsevier B.V., All rights reserved.

PY - 2021

Y1 - 2021

N2 - This paper focuses on microstructural and mechanical characterization 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. Its surface roughness, constituting phases, underlying microstructures and chemical composition were analyzed. 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 load–displacement 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 characterization 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 toward AM of patient-specific stents.

AB - This paper focuses on microstructural and mechanical characterization 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. Its surface roughness, constituting phases, underlying microstructures and chemical composition were analyzed. 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 load–displacement 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 characterization 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 toward AM of patient-specific stents.

KW - additive manufacturing

KW - material microstructure

KW - mechanical properties

KW - metallic stents

KW - nanoindentation

KW - selective laser melting

UR - http://www.scopus.com/inward/record.url?scp=85098951609&partnerID=8YFLogxK

U2 - 10.1007/s11665-020-05366-9

DO - 10.1007/s11665-020-05366-9

M3 - Article

AN - SCOPUS:85098951609

JO - Journal of Materials Engineering and Performance

JF - Journal of Materials Engineering and Performance

SN - 1059-9495

ER -