Abstract
The effect of heat treatment on the corrosion property of selective laser melted (SLM) 304L stainless steel (SS304L) was investigated by adjusting the oxygen-rich nanoparticles and the microstructure. A significant improvement in the pitting resistance of SLM SS304L was found after the 1100 °C heat treatment. The heat treatment eliminated the melt pool boundaries, reduced the defect density and promoted the formation of uniform and dispersed oxygen-rich nanoparticles. In addition, the Cr2O3 content in the passive film increased after the heat treatment. These factors enhanced the stability of the passive film and improved the corrosion resistance of SLM SS304L.
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