Abstract
The development of gas nitriding and the systematic expansion of its scope of application in practice means that the issue of the production of nitrided layers on steels is still in the center of interest of industry and research centers from both a cognitive and application point of view. Research mainly focuses on determining the relationship between the construction of the nitrided layer and its production parameters. The condition of full control of the nitriding process effect is the control of the nitrogen availability of the nitriding atmosphere, which depends on the value of the nitrogen potential (Np) and the degree of ammonia dissociation (α). Shaping of these parameters is carried out by controlling and regulating the composition of the inlet atmosphere. Control and regulation of the inlet atmosphere composition is important in controlling the nitrogen availability of the nitriding atmosphere and, consequently, the kinetics of nitrided layer thickness increase. The article describes models for changing the composition of the three-component and two-component inlet atmosphere. Two variants of controlling and regulating the nitrogen potential are discussed: the composition of the two-component inlet atmosphere, dissociated ammonia-ammonia and the temperature function in the heating stage of the charge.
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