Variation of the surface hardness of plow-and-tine movable operating parts of tilling machines being in service
DOI:
https://doi.org/10.31548/bio2020.01.011Keywords:
Hardness, Surface, Movable operating part, Tilling machineAbstract
Physical and mechanical properties of friction surfaces are subject to changes in the process of wear, thus providing for probable increase or decrease in the wear rate. The study of laws governing the wear induced changes of the physical and mechanical properties of the surface layers will allow to work out the recommendations for improvement of the machine part wear resistance.
The purpose of the study was to determine the effect of the soil environment characteristics on the variation of the surface hardness tilling machine movable operating parts in service. Hardness measurements were performed using the T-UD-2 ultrasonic hardness meter under ASTM A1038-19.
Because of wear of the surfaces of the plow-and-tine movable operating parts of tilling machines being in service, the surface hardness increases by 1,61…21,42 %, which is explained by the self-strain-hardening process taking place due to interaction with the abrasive soil particles that have a higher hardness. A note should be made of a more significant increase of the micro-hardness on the surface of the movable operating parts of plows, i.e. by 7,44…21,42 % compared to 1,61…5,2 %, whereby the same is increased in the tines. The build-up of the specific pressure in the abrasive material-to-surface contact area and increase of the abrasive consolidation degree lead to an increase of the surface hardness of the tilling machine movable operating parts. An increase in surface hardness has been observed in the process of wear of the plow-and-tine movable operating parts of tilling machines, which can be explained by strain-hardening of the surface layer. The strain-hardening effect occurs due to the high speed of the plastic strain exceeding the speed of thermal processes on the friction surface since the said tribosystem is of open type.
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