Study of effect of lanthanum oxide on kinetics, morphology and properties of borated layers obtained by liquid method on different carbon content steels

Abstract

Studies were carried out of the structure and properties of borated layers obtained on steels with different carbon contents by liquid electrolysis-free boriding in a melt with the addition of lanthanum oxide. It has been shown that the presence of lanthanum oxide additives makes it possible to increase the depth and reduce the microhardness values of borated layers. The microhardness values of the boride layers were 1650—1750 HV0,1, the microhardness values of the transition layer were about 650—750 HV0,1. Electron microscopy studies have revealed that lanthanum oxide additives can affect the morphology of borated layers. The energy dispersive analysis and the distribution maps of alloying elements showed that some of the alloying elements are concentrated in the transition layer.