Oxidation resistance of the 316L manufactured by cold-rolled and selective laser melting in CO2 and air

The high-temperature oxidation behavior of 316L manufactured by cold-rolled and selective laser melting in CO2 and air was investigated. Scanning electron microscopy, X-ray diffraction, and energy disperse spectroscopy were employed to characterize the oxidation products on investigated 316L. Results showed that oxidation kinetics of all samples followed a parabolic law from 600 & DEG;C to 900 & DEG;C. At 700 & DEG;C, cold-rolled 316L exposed a better oxidation resistance, while selective laser melting 316L was more resistant to oxidation at 600 & DEG;C, 800 & DEG;C and 900 & DEG;C. The above oxidation behavior may be caused by the recrystallization of cold-rolled 316L and high density of grain boundaries in selective laser melting 316L.