Abstract
UNS S31803 duplex stainless steel (DSS) was nitrided using the active screen plasma nitriding (ASPN) technique at temperature ranging from 400 to 450°C. Microstructures and corrosion properties of the untreated substrate and AS plasma nitrided specimens were analyzed by means of X-ray diffractometry, scanning electron microscopy, microhardness measurement, anodic polarization test, and wear test using a ring-on-disc tester. The result shows that ASPN specimen surface nitrided at 420°C consisted of a dual phase nitrided layer of nitrogen expanded austenite (γN or S-phase) and expanded ferrite (αN), which considerably improved the hardness, wear, and corrosion property of the UNS S31803 duplex stainless steel. For ASPN specimens nitrided at 435°C or 450°C, precipitated nitrides of Fe3N, Fe4N and chromium nitride (CrN) appeared in the nitrided layer. The results showed that the wear and corrosion resistance of the specimen nitrided at 420°C for 10 h were exceedingly improved, and the specimen exhibited the least wear mass loss and corrosion current density.
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