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Enhancing corrosion resistance of additive manufactured 316L stainless steel in a physiological environment by remelting strategy for biomedical implants applications

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Abstract

316L stainless steel (SS) biomedical implants produced via selective laser melting (SLM) represent an innovative approach in additive manufacturing. However, a significant challenge associated with these implants is their susceptibility to corrosion, which can lead to complications such as inflammation, pain, and the need for repeated surgical interventions. This study aims to address this issue by employing a remelting strategy within the SLM process to enhance the corrosion resistance of the implants. This study investigated the influence of three laser power levels(150 W, 200 W, and 250 W) on the properties of remelted samples. Some characteristics of the additively manufactured components, including surface roughness, microhardness, porosity, and corrosion rate, were systematically analyzed. The results indicated that remelting at 150 W effectively reduced surface roughness, decreasing the mean value from 12.82 µm (control sample) to 10.32 µm. Further increases in laser power resulted in additional reductions in surface roughness. Microhardness was significantly improved by remelting, although variations in laser power had a minimal impact on this property. Porosity analysis demonstrated a marked reduction in both the number and size of pores following remelting. Corrosion resistance assessments revealed that remelting enhances corrosion resistance, with the corrosion rate of the control sample recorded at 76.8 µm/year, while the sample treated with a laser power of 250 W exhibited the lowest corrosion rate of 48.51 µm/year. These findings confirm that remelting strategies in SLM can effectively improve the long-term performance of 316L stainless steel implants by enhancing their corrosion resistance.

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  1. Department of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran

    Daniyal Sayadi, Sajjad Rajabi, Seyyed Mohammad Nikouei & Mohsen Khajehzadeh

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  1. Daniyal Sayadi
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  2. Sajjad Rajabi
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Sayadi, D., Rajabi, S., Nikouei, S.M. et al. Enhancing corrosion resistance of additive manufactured 316L stainless steel in a physiological environment by remelting strategy for biomedical implants applications. Int J Adv Manuf Technol (2025). https://doi.org/10.1007/s00170-025-16799-8

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