PSI - Issue 15

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000–000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000–000 ScienceDirect

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 15 (2019) 41–45

© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of International Conference on Stents: Materials, Mechanics and Manufacturing ICS3M 2019. © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of International Conference on Stents: Materials, Mechanics and Manufacturing ICS3M 2019. Ab tract Th s paper focuses on microstructural characterisation of metallic stents produced with additive manufacturing, a promis technique to deliver patie t-spe ific stents. A 316L stainless st el tube, manufactured by selective la er melting (SLM), and a 316L stainless steel stent w re i vestig ted. Specim s were pr pared fo micros uctural studies through secti ing, mounting, grinding and metallurgical polishing procedures. Microstructures wer examined employing a JEOL 7100F scanning electron microscope, with simultaneous elemental analysis using energy dispers ve x-ray spectroscopy (EDS) and orientati n analysis wit electron backscatter diffraction. The obtained resul s showed that a c nter of th elective laser melted (SLMed) tube had a columnar and coarse grain microstructure, with high-angle grain boundaries. The EDS analysis confirmed that the composition of the SLMed tube were similar to those of commercial stent, but with some differences in weight fractions of alloy elements. © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of International Conference on Stents: Materials, Mechanics and Manufacturing ICS3M 2019. International Conference on Stents: Materials, Mechanics and Manufacturing ICS3M 2019 Characterisation of Additively Manufactured Metallic Stents Enzoh Langi a , Anuj Bisht a , Vadim V. Silberschmidt a , Pablo D. Ruiz a , Felix Vogt b , Lucas Mailto c , Lukas Masseling c , Liguo Zhao a 0F * a Wolfson School of Mechanical, Electrical and Manufacturing Engineering, Loughborough University, Epinal Way, Loughborough, LE11 3TU, UK b Department of Cardiology, University Hospital Aachen, Pauwelsstrasse 30, 52074 Aachen, Germany c Fraunhofer-Institut für Lasertechnik ILT, Steinbachstr. 15, 52074 Aachen, Germany Abstract This paper focuses on microstructural characterisation of metallic stents produced with additive manufacturing, a promising technique to deliver patient-specific stents. A 316L stainless steel tube, manufactured by selective laser melting (SLM), and a 316L stainless steel stent were investigated. Specimens were prepared for microstructural studies through sectioning, mounting, grinding and metallurgical polishing procedures. Microstructures were examined employing a JEOL 7100F scanning electron microscope, with simultaneous elemental analysis using energy dispersive x-ray spectroscopy (EDS) and orientation analysis with electron backscatter diffraction. The obtained results showed that a center of the selective laser melted (SLMed) tube had a columnar and coarse grain microstructure, with high-angle grain boundaries. The EDS analysis confirmed that the composition of the SLMed tube were similar to those of commercial stent, but with some differences in weight fractions of alloy elements. International Conference on Stents: Materials, Mechanics and Manufacturing ICS3M 2019 Characterisation of Additively Manufactured Metallic Stents Enzoh Langi a , Anuj Bisht a , Vadim V. Silberschmidt a , Pablo D. Ruiz a , Felix Vogt b , Lucas Mailto c , Lukas Masseling c , Liguo Zhao a 0F * a Wolfson School of Mechanical, Electrical and Ma ufacturing Engineering, Loughborough University, Epinal Way, Loughborough, LE11 3TU, UK b Department of Cardiology, University Hospital Aachen, Pauwelsstrasse 30, 52074 Aachen, Germany c Fraunhofer-Institut für Lasertechnik ILT, Steinbachstr. 15, 52074 Aachen, Germany Keywords: Metallic stents; Additive manufacturing; Selective laser melting; Microstructure; Patient specific

Keywords: Metallic stents; Additive manufacturing; Selective laser melting; Microstructure; Patient specific

* Corresponding author. Tel.: +44(0) 1509 227799. E-mail address: L.Zhao@lboro.ac.uk * Corresponding author. Tel.: +44(0) 1509 227799. E mail address: L.Zhao@lboro.ac.uk

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of International Conference on Stents: Materials, Mechanics and Manufacturing ICS3M 2019. 2452-3216 © 2019 The Authors. Published b Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of International Conference on Stents: Materials, Mechanics and Manufacturing ICS3M 2019.

2452-3216  2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0/) Selection and peer-review under responsibility of International Conference on Stents: Materials, Mechanics and Manufacturing ICS3M 2019. 10.1016/j.prostr.2019.07.008