Abstract
This work discussed the effects of different scanning speeds (800, 1083, 1200 and 1400 mm/s) on the microstructure of 316L stainless steel manufactured by selective laser melting (SLM) and the related corrosion behavior. Results showed that there were more voids with faster scanning speeds, and there were oxide powder and non-melt silicon inside the defects. The SLM 316L exhibited a full gamma austenite phase filled with sub-grains, and the average grain size of SLM-1083 mm/s 316L was approximately 42 μm, three times larger than that of the quenched 316L. The pitting potentials for the SLM 316L were all approximately 300 mV higher than that of the quenched due to the modification of inclusions in SLM, but the corrosion rate for the SLM 316L was faster, which was attributed to the voids and unstable passive film. The number of pitting sites increased with the scanning speed, and the pits occurred preferentially at the voids in SLM 316L.
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Acknowledgments
This work was supported by Shanghai Materials Genome Institute No.5 (Project No. 16DZ2260605), Shanghai Sailing Program (Project Number 17YF1405400) and the project to strengthen industrial development at the grass-roots level (Project No. TC160A310/19).
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Ni, X., Kong, D., Wu, W. et al. Corrosion Behavior of 316L Stainless Steel Fabricated by Selective Laser Melting Under Different Scanning Speeds. J. of Materi Eng and Perform 27, 3667–3677 (2018). https://doi.org/10.1007/s11665-018-3446-z
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DOI: https://doi.org/10.1007/s11665-018-3446-z