The article deals with porosity of compound layers after gas and plasma nitriding. Experiments are focused on using of gas and plasma nitriding processes for surface treatment. Nitriding technologies were applied to steels C 35 (sample A1) and steel 34CrNiMo6 (sample A6), which were subsequently evaluated by electron microscopy, GDOES, XRD and microhardness methods. The results of measurement showed characteristics of chemical composition of alloying elements in core of material and in created nitrided layer after chemical-heat treatment process. Main task was to compare the porosity after plasma and gas nitriding and finally prepare the documentation of pores from surface and from cross sectional structure. Plasma and gas nitriding process were applied for increasing of surface hardness of material in depth and improve mechanical and tribological properties. Mechanical and tribological properties of tested material were significantly increased.Keywords: Gas nitriding; plasma nitriding; alloying elements; nitrided layer; porosity
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