Abstract
The task of increasing the service life of agricultural machinery by hardening the surfaces of its working parts has always been relevant. Currently, this problem is most successfully solved with the use of plasma technologies. In this paper, we present the results of some studies on the vibrating plasma treatment of the surface layer of samples made of steel 65G. (Research purpose) The research purpose is determining the possibilities of vibrating plasma methods for hardening the working parts of agricultural machinery and studying the physical and mechanical properties and structural changes in the surface layer of these products. (Materials and methods) Four samples of 65G steel were taken for research: the initial one; a sample with electric spark treatment; a sample with vibrating arc treatment with a single-rod electrode; a sample with vibrating arc treatment with a three-rod electrode. The morphology of the surface, the elemental composition of the samples and the microstructure of the coatings were studied using electron and metallographic microscopes. (Results and discussion) It has been shown that electric spark treatment in some modes increases the hardness of the surface of the material by more than four times. Vibrating arc treatment with a copper graphite electrode allows carburization of the surface layer of the material; the hardened layer has a hardness of more than three times the hardness of the base. (Conclusions) The results of the study are consistent with the results of studies by other authors on electric spark and vibrating arc discharges. The surface layer formed during the processing of the part with vibrating plasma is a new composite structure. Hardening of the base material along the depth of the part during electric spark processing occurs by 0.5-1.0 millimeters, during vibrating arc processing - up to 3-4 millimeters.
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