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Improving the mechanical strength of dental applications and lattice structures SLM processed

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journal contribution
posted on 23.03.2021, 10:15 by C Cosma, J Kessler, A Gebhardt, Ian Campbell, N Balc
© 2020 by the authors. To manufacture custom medical parts or scaffolds with reduced defects and high mechanical characteristics, new research on optimizing the selective laser melting(SLM) parameters are needed. In this work, a biocompatible powder, 316L stainless steel, is characterized to understand the particle size, distribution, shape and flowability. Examination revealed that the 316L particles are smooth, nearly spherical, their mean diameter is 39.09 μm and just 10% of them hold a diameter less than 21.18 μm. SLM parameters under consideration include laser power up to 200 W, 250-1500 mm/s scanning speed, 80 μm hatch spacing, 35 μm layer thickness and a preheated platform. The effect of these on processability is evaluated. More than 100 samples are SLM-manufactured with different process parameters. The tensile results show that is possible to raise the ultimate tensile strength up to 840 MPa, adapting the SLM parameters for a stable processability, avoiding the technological defects caused by residual stress. Correlating with other recent studies on SLM technology, the tensile strength is 20% improved. To validate the SLM parameters and conditions established, complex bioengineering applications such as dental bridges and macro-porous grafts are SLM-processed, demonstrating the potential to manufacture medical products with increased mechanical resistance made of 316L.

Funding

DiCoMI project funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No. 778068

Human Capital Operational Programme agreement POCU/380/6/13/123927 financed from the European Social Fund (contract no. 56437/24.07.2019)

History

School

  • Design and Creative Arts

Department

  • Design

Published in

Materials

Volume

13

Issue

4

Publisher

MDPI

Version

VoR (Version of Record)

Rights holder

© The authors

Publisher statement

This is an Open Access Article. It is published by MDPI 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

15/02/2020

Publication date

2020-02-18

Copyright date

2020

ISSN

1996-1944

Language

en

Depositor

Prof Ian Campbell. Deposit date: 18 March 2021

Article number

905