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1 2010

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Structure and properties of surface layers of selected constructional steels after sulfonitriding

Lesz S., Kalinowska-Ozgowicz E., Gołombek K., Kleczka M.

Archives of Materials Science and Engineering

2010

Vol. 42, nr 1

21-28

Purpose: The main aim of the paper was to investigate the structure and properties of the surface layers of the C45, 42CrS4, 42CrMoS4 steels after sulfonitriding at a temperature of 540 and 570°C. The thickness of zones occurring in the sulphonitric layer was defined just as their chemical and phase composition and microhardness. Moreover, abrasion resistance in the zones of sulfonitrided layers was investigated. Design/methodology/approach: The following experimental techniques were used: light microscopy (LM), scanning electron microscopy (SEM), X-ray diffraction (XRD) method, Vickers microhardness, abrasion tests. Findings: Changes of microhardness in the zones of sulfonitrided layers have been presented. It has been stated that the surface layers of steels C45, 41CrS4 and 42CrMoS4 after gas sulfonitriding at 570°C are composed of four zones which are: external zone of sulfides with grain-like structure, zone of nitride phases with compound structure and with round sulfides precipitates, zone of nitride phases with diversified structure depending on chemical composition of the steel base of hardness 262 HV for steel 41CrS4 and 330 HV for steel 42CrMoS4, zone of nitride phases in the form of elongated precipitates in matrix of C45 steel or diffusion zone of micro-hardness 500-700 HV at the distance of 100-110 mm from the surface of 41CrS4 and 42CrMoS4 steels. Research limitations/implications: Impossibility of microhardness measurement in the external zone of the sulfonitrided layer. Practical implications: Sulfonitriding is a process of termochemical treatment used for vehicle and device parts on a large scale. Originality/value: Varied morphology of zones of the upper layers revealed by the method of scanning electron microscopy.