Abstract
In this experiment, post-oxidizing treatments were implemented on AISI 316L stainless steel which was plasma nitrocarburized previously at various temperatures. Plasma nitrocarburizing was performed on AISI 316L stainless steel at various temperatures (400℃, 450℃, 500℃) with a gas mixture of O_2 and H_2. After treatment, the behavior of the duplex layer was investigated by optical microscopy, X-ray diffraction, scanning electron microscopy and micro-hardness testing. A Potentiodynamic polarization test was also used to evaluate the corrosion esistance of the samples. The X-ray diffraction confirmed the development of a Cr_2N, γ_N phase and magnetite (Fe3O4) phase under plasma nitrocarburizing and post-oxidizing processes. Additionally, it was found that the thickness and surface hardness increased with an increasing nitrocarburizing temperature. The experiment revealed that 316L stainless steel had better hardness and excellent corrosion resistance than the bare sample, when both the nitrocarburizing and oxidizing treatment temperatures were 400℃.
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