Abstract
The plasma nitriding behaviors of nanocrystalline surface induced by surface mechanical attrition (SMA) and of conventional coarse-grained surface in 1Cr18Ni9Ti stainless steel were compared. Microstructure features of various sections in the surface layer, from the matrix to the nitriding surface, were systematically characterized by XRD, SEM and TEM. The thickness of compound layer and hardness distribution in the treated surface layer were investigated by means of metallographic observation and microhardness measurement. The subsequent nitriding kinetics of the treated steel with the nanostructured surface layer were greatly enhanced, the nitriding thickness was deeper than that of the conventional surface and the nitriding temperature could be as low as 300°C, which is much lower than conventional nitriding temperature.
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