Abstract
AISI 420 stainless steel was nitrided at low temperatures and anodic potential in a plasma atmosphere of ammonia (NH3) assisted by hollow cathode discharge. The specimens were placed on a worktable connected to the wall of vacuum chamber that was earthed (0 V) and used as anode of glow discharge. Plasma nitriding was carried out at a temperature ranging from 390 to 510 °C for 4 h in NH3 atmosphere. The thickness of white layer was in a range of 6 to 40 μm. The surface hardness reached to 1250 ± 72 HV0.05 for the specimen nitrided at 510 °C for 4 h. Both corrosion and wear resistance of AISI 420 stainless steel were simultaneously improved after plasma nitriding at 450 °C for 4 h.
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