WEAR RESISTANCE OF EUTECTIC COATINGS OF THE Fe-Mn-C-B SYSTEM ALLOYED WITH Si, Ni, AND Cr

We analyze the wear resistance, structures, and compositions of eutectic coatings of the Fe-Mn-C-B system alloyed with Si, Ni, and Cr and obtained on 45 steel by the methods of electric-arc and plasma spraying performed by using eutectic powder wires. The process of wear of eutectic coatings is accompanied by the intense diffusion processes leading to segregation and, hence, to the increase in the C, B, and Si contents on the friction surface. Boron and silicon form nonstoichiometric oxides in the actual contact spots. Carbon is in the free state. As a result, the friction coefficient decreases and, therefore, the wear resistance of eutectic alloys increases.