Abstract
The influence of plasma hardening on the processes of hardening of heavily loaded and, therefore, high-wear parts of the working bodies of soil-cutting machines has been studied. It is shown that during surface plasma hardening of a plow share made of 65G structural steel, a gradient-layered (mixed) structure is formed in a hardened zone 0.8 mm thick, consisting of a finely dispersed mixture of fine-grained austenite decomposition products with varying microhardness in the range of 760-395 HV. It has been established that the formation of a finely dispersed configuration and the features of its formation after surface plasma treatment are explained by ultra-high heating and cooling rates, which are unattainable with traditional heat treatment methods. During plasma treatment of parts, metastable structures with high strength and wear resistance are formed. The result of hardening the plow share by plasma hardening in the form of a modified layer with a finely dispersed configuration is obtained, an increase in the wear resistance of the plow share is observed compared to serial parts subjected to traditional heat treatment and a significant reduction in the cost of the hardening process due to the use of an economical, sufficiently productive surface plasma hardening technology
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