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Metals 2017, 7(2), 64; doi:10.3390/met7020064

Investigation on Porosity and Microhardness of 316L Stainless Steel Fabricated by Selective Laser Melting

1
Materials Research Group, Faculty of Engineering and the Environment, University of Southampton, Southampton SO17 1BJ, UK
2
VIS X-Ray Imaging Centre, Faculty of Engineering and The Environment, University of Southampton, Southampton SO17 1 BJ, UK
*
Author to whom correspondence should be addressed.
Received: 5 January 2017 / Accepted: 15 February 2017 / Published: 20 February 2017
(This article belongs to the Special Issue 3D Printing of Metals)
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Abstract

This study investigates the porosity and microhardness of 316L stainless steel samples fabricated by selective laser melting (SLM). The porosity content was measured using the Archimedes method and the advanced X-ray computed tomography (XCT) scan. High densification level (≥99%) with a low average porosity content (~0.82%) were obtained from the Archimedes method. The highest porosity content in the XCT-scanned sample was ~0.61. However, the pores in the SLM samples for both cases (optical microscopy and XCT) were not uniformly distributed. The higher average microhardness values in the SLM samples compared to the wrought manufactured counterpart are attributed to the fine microstructures from the localised melting and rapid solidification rate of the SLM process. View Full-Text
Keywords: porosity; microhardness; Selective Laser Melting (SLM); advanced X-ray computed tomography (XCT) porosity; microhardness; Selective Laser Melting (SLM); advanced X-ray computed tomography (XCT)
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Yusuf, S.M.; Chen, Y.; Boardman, R.; Yang, S.; Gao, N. Investigation on Porosity and Microhardness of 316L Stainless Steel Fabricated by Selective Laser Melting. Metals 2017, 7, 64.

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