Abstract
D.C. plasma nitriding (PN) of AISI4140 steel catalyzed by pre-oxidation was investigated primarily. The pre-oxidation was carried out in air prior to plasma nitriding. The results revealed that pre-oxidation had significant catalysis effect on plasma nitriding, the maximum compound layer thickness of 15μm was obtained after nitriding at 500°C for 4h under the optimum pre-oxidation (PO) condition of 300°C and 30min, which was two times thicker than that without pre-oxidation. The possible catalysis mechanism is due to the formation of a uniform nano-iron oxide particle along with some nanocracks and nanopores on the surface, which has the highest SFE.
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