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

0582301 - ÚFM 2025 RIV SG eng J - Journal Article
Kocich, R. - Kunčická, Lenka - Benc, M. - Weiser, Adam - Németh, Gergely
Corrosion behavior of selective laser melting- manufactured bio-applicable 316L stainless steel in ionized simulated body fluid.
International Journal of Bioprinting. Roč. 10, č. 1 (2024), s. 339-356. ISSN 2424-7723. E-ISSN 2424-8002
R&D Projects: GA MŠMT LM2023057
Research Infrastructure: CICRR - 90241
Institutional support: RVO:68081723 ; RVO:61389005
Keywords : pitting corrosion * mechanical-properties * heat-treatment * residual-stress * nuclear-fusion * microstructure * technology * texture * metals * design * Additive manufacturing * Rotary swaging * 316L stainless steel * Electro-chemical corrosion * Microstructure * Residual stress
OECD category: Materials engineering; Materials engineering (UJF-V)
Impact factor: 8.4, year: 2022
Method of publishing: Open access
https://accscience.com/journal/IJB/10/1/10.36922/ijb.1416

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 postprocessing 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.
Permanent Link: https://hdl.handle.net/11104/0352929