AccScience Publishing / IJB / Volume 10 / Issue 1 / DOI: 10.36922/ijb.1416
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RESEARCH ARTICLE

Corrosion behavior of selective laser melting-manufactured bio-applicable 316L stainless steel in ionized simulated body fluid

Radim Kocich1,2* Lenka Kunčická2,3 Marek Benč1 Adam Weiser3 Gergely Németh4
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1 VŠB-Technical University of Ostrava, Faculty of Materials Science and Technology, 17. Listopadu 15, 70833 Ostrava 8, Czech Republic
2 Brno University of Technology, Faculty of Mechanical Engineering, Technická 2896-2, 60200 Brno, Czech Republic
3 Institute of Physics of Materials, Czech Academy of Sciences, Žižkova 22, 61662 Brno, Czech Republic
4 Nuclear Physics Institute, Czech Academy of Sciences, Husinec - Rez 130, 25068 Rez, Czech Republic
IJB 2024, 10(1), 1416 https://doi.org/10.36922/ijb.1416
Submitted: 30 July 2023 | Accepted: 7 September 2023 | Published: 5 January 2024
(This article belongs to the Special Issue 3D Bioprinting for Materials and Application)
© 2024 by the Author(s). This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution 4.0 International License ( https://creativecommons.org/licenses/by/4.0/ )
Abstract

Additive manufacturing (AM) is gaining increasing popularity in various fields, including biomedical engineering. Although AM enables fabrication of tailored components with complex geometries, the manufactured parts typically feature several internal issues, such as unpredictable distribution of residual stress and printing defects. However, these issues can be reduced or eliminated by post-processing via thermomechanical treatment. The study investigated the effects of combinations of AM and post-processing by the intensive plastic deformation method of rotary swaging (variable swaging ratios) on microstructures, residual stress, and corrosion behaviors of AISI 316L stainless steel workpieces; the corrosion tests were performed in an ionized simulated body fluid. The results showed that the gradual swaging process favorably refined the grains and homogenized the grain size. The imposed swaging ratio also directly influenced the development of substructure and dislocations density. A high density of dislocations positively affected the corrosion resistance, whereas annihilation of dislocations and formation of subgrains had a negative effect on the corrosion behavior. The first few swaging passes homogenized the distribution of residual stress within the workpiece and acted toward imparting a predominantly compressive stress state, which also favorably influenced the corrosion behavior. Lastly, the presence of the {111}||swaging direction texture fiber (of a high intensity) increased the resistance to pitting corrosion. Overall, the most favorable corrosion behavior was acquired for the AM sample subjected to the swaging ratio of 0.8, exhibiting a strong fiber texture and a high density of dislocations.

Keywords
Additive manufacturing
Rotary swaging
316L stainless steel
Electrochemical corrosion
Microstructure
Residual stress
Funding
The work was supported by VŠB–Technical University of Ostrava (project number SP2023/022) and Brno University of Technology (project number FSI-S-23-8231). GN also acknowledges the support by the MEYS infrastructural project LM2023057. Neutron diffraction measurements were carried out at the CANAM infrastructure of the NPI CAS Rez. The employment of the CICRR infrastructure supported by MEYS project LM2023041 is acknowledged.
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Conflict of interest
The authors declare no conflicts of interest.
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International Journal of Bioprinting, Electronic ISSN: 2424-8002 Print ISSN: 2424-7723, Published by AccScience Publishing