Effects of the heat treatment on the microstructure and corrosion behavior of 316 L stainless steel manufactured by Laser Powder Bed Fusion
Additively manufactured AISI 316 L stainless steel samples were heat treated at temperatures from 400 ◦C to 1100 ◦C, and the corrosion behavior in chloride environments was electrochemically studied. Heat treatments at 400 ◦C and 650 ◦C increased the grain size and the treatment at 1100 ◦C formed MnCr2O4 inclusions. Also, these postprocessing techniques reduce the hardness and increased the porosity. Heat treatment at 400 ◦C increased the polarization resistance and maintained the pitting corrosion mechanisms of the additively manufactured samples. Heat treatments at higher temperatures reduced the polarization resistance but changed the corrosion resistance mechanisms.
This work was supported by the Ministerio de Economía y Competitividad of Spain (Project RTI2018–096391-B-C31, PID2021–123891OB-I00, PID2021–124341OB-C21) and Comunidad de Madrid (Project S2018/NMT-4411). We acknowledge the National Fusion Laboratory of CIEMAT for the sample preparation. We also acknowledge the Electronic Microscopy National Center of the Complutense University of Madrid for the use of their JEOL 300 F microscope.
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