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Microstructures and Nanomechanical Properties of Additively Manufactured Metallic Stents
Enzoh Langi1, Liguo Zhao2,*
1 Mechanical Department, School of Engineering, The Copperbelt University, Jambo Drive, Kitwe, BS8 1TH, Zambia
2 College of Energy and Power Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing, 210016, China
* Corresponding Author: Liguo Zhao. Email:
The International Conference on Computational & Experimental Engineering and Sciences 2023, 25(3), 1-1. https://doi.org/10.32604/icces.2023.010163
Abstract
Additive manufacturing emerges as an innovative technology to fabricate medical stents used to treat
blocked arteries. However, there is a lack of study of underlying microstructure and mechanical properties
of additively manufactured stent. In this work, additively manufactured 316L stainless steel stent was
investigated, with electrochemical polishing being used to improve the surface finish. Microstructural
characterisation was carried out using optical microscopy, scanning electron microscopy, and electron
backscatter diffraction. The hardness and elastic modulus were measured using Berkovich nanoindentation,
with an emphasis on the effect of grain orientation. In addition, spherical nanoindentation was used to
obtain indentation stress-strain curves based on load-displacement responses. The results showed that
electrochemical polishing was effective in reducing the average surface roughness, although not reaching
the level of commercial stent. The additively manufactured stent demonstrated a hierarchical grain
microstructure with columnar grains and cellular sub-grains, as opposed to equiaxed fine grains and twins
in commercial stent. The hardness and modulus of additively manufactured stent were higher than those of
the commercial one. The grains close to the (111) orientation exhibited the highest hardness and elastic
modulus followed by (101) and (001) orientations. The indentation stress-strain curves, yield strength, and
hardening behaviour of additively manufactured stent were similar to those of commercial stent. This work
provides a helpful understanding of the microstructure and properties of additively manufactured stent and
outlines the technical barriers in the development of additive technology for innovative manufacturing of
stent.
Keywords
Cite This Article
APA Style
Langi, E., Zhao, L. (2023). Microstructures and nanomechanical properties of additively manufactured metallic stents. The International Conference on Computational & Experimental Engineering and Sciences, 25(3), 1-1. https://doi.org/10.32604/icces.2023.010163
Vancouver Style
Langi E, Zhao L. Microstructures and nanomechanical properties of additively manufactured metallic stents. Int Conf Comput Exp Eng Sciences . 2023;25(3):1-1 https://doi.org/10.32604/icces.2023.010163
IEEE Style
E. Langi and L. Zhao, "Microstructures and Nanomechanical Properties of Additively Manufactured Metallic Stents," Int. Conf. Comput. Exp. Eng. Sciences , vol. 25, no. 3, pp. 1-1. 2023. https://doi.org/10.32604/icces.2023.010163