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Influence of alloying elements on the properties of diffusion layers
The paper is devoted to a research focused on the influence of alloying elements on the properties of diffusion layers created on selected low-carbon, low-alloyed steels equivalent to 18CrNiMo7-6, 15NiCr13, 17Ni4CrMo (i.e. CSN 41 6220, CSN 41 6426, CSN 41 6720). For a creation of the surface layers plasma nitriding (PN) and nitriding in gaseous atmosphere (GN) were utilized. The aim of the research is to find a dependence between hardness of the surface layers and an amount of the alloying elements contained in the steels. For the reason the following methods were selected for the experiment. The chemical composition was confirmed by utilizing optical emission spectrometer Tasman Q4. The surface morphology was observed with analytical scanning electron microscope TESCAN MIRA 4th generation. The microstructure of the steels was observed by utilizing Opto digital microscope DSX500i. The same instrument was also utilized for an observation and thickness measurement of the compound layer. The microhardness measurements were performed on universal microhardness tester LM247 AT LECO. The experimental results show the dependence between hardness of the diffusion layers upon content of carbides-creating and nitrides-creating alloying elements.
