IMPROVING THE OPERATIONAL PROPERTIES OF CENTRIFUGAL CAST ROLLS WITH A WORKING LAYER OF CHROMIUM CAST IRON WITH MICROSTRUCTURE ASSESSMENT BY COMPUTER VISION

Abstract

Based on the performed studies, it was found that the main criteria describing the quality and wear resistance of a roll with working layer of chromium cast iron are: proportion of residual austenite; degree of structure dispersion; chemical composition (ratios Cr/C, Ni/(Cr/C) and Cr/Ni); carbide phase; mechanical properties; voltage level regulated by heat treatment according to Hc. To predict operational resistance, it is advisable to use models establishing the relationship between chemical composition, ratio of structural components, conditions of working layer formation, heat treatment parameters, mechanical and operational properties.