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Microstructure and Corrosion Characteristics of Selective Laser-Melted 316L Stainless Steel: The Impact of Process-Induced Porosities

  • Solidification Defects in Additive Manufactured Materials
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Abstract

The microstructure and corrosion susceptibility of selective laser-melted (SLM) 316L stainless steel on planes aligned and perpendicular to the building direction in aqueous 3.5 wt.% NaCl solution were investigated and compared with their conventionally wrought counterpart. Cyclic potentiodynamic polarization results confirmed a superior pitting resistance and a reduced rate of metastable pitting for the SLM-fabricated samples regardless of the sample’s orientation compared to the wrought alloy. Although the process-induced porosities in the SLM samples did not affect the corrosion and pitting potentials of the alloy at the initial immersion time, they likely contributed to the reduced re-passivation potential of the surface. Furthermore, at longer immersion times, the electrochemical impedance spectroscopy and immersion testing results confirmed a more detrimental impact of the process-induced porosities on lowering the electrochemical stability of the SLM-316L surface perpendicular to the building direction, where larger size and higher density of crevice-like porosities were detected.

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Acknowledgments

The authors are grateful for support of the Natural Sciences and Engineering Research Council of Canada (NSERC) [Grant #RGPIN-2017-04368] for sponsoring this work. M.M. would like to thank NSERC [Grant #RGPIN-2016-04221], New Brunswick Innovation Foundation (NBIF) [Grant #RIF 2018-005], and Atlantic Canada Opportunity Agency (ACOA)-Atlantic Innovation Fund (AIF) [Project #210414].

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Authors and Affiliations

  1. Faculty of Engineering and Applied Science, Memorial University of Newfoundland, St. John’s, NL, Canada

    M. Kazemipour & A. M. Nasiri

  2. Marine Additive Manufacturing Centre of Excellence (MAMCE), University of New Brunswick, Fredericton, NB, Canada

    M. Mohammadi

  3. Applied Research & Innovation, Nova Scotia Community College, Dartmouth, NS, Canada

    E. Mfoumou

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  1. M. Kazemipour
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  2. M. Mohammadi
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  3. E. Mfoumou
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  4. A. M. Nasiri
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Kazemipour, M., Mohammadi, M., Mfoumou, E. et al. Microstructure and Corrosion Characteristics of Selective Laser-Melted 316L Stainless Steel: The Impact of Process-Induced Porosities. JOM 71, 3230–3240 (2019). https://doi.org/10.1007/s11837-019-03647-w

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  • DOI: https://doi.org/10.1007/s11837-019-03647-w

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