2019 Volume 91 Issue 6 Pages 349-355
Multi-component white cast iron containing Cr, Mo, V and W has been widely popularized as roll material for hot rolling mills because of its excellent wear resistance. This wear resistance is required as a primary performance of the rolling mill rolls. The influence of chemical composition, metallurgical and mechanical properties on hot wear characteristics were investigated changing the C, Cr, Mo, W, and V contents in the basic alloy with Fe-2%C-5%V-5%Cr- 5%Mo-%W-5%Co. The microstructure of eutectic MC and M2C carbides and martensite matrix was obtained in wide regions with carbon-balance (Cbal) of 0±1%. In these areas, hardness was over 600HV. Wear resistance is basically greater in cast irons with high hardness. The wear decreased as the hardness increased, and the correlation with wear resistance was found to be strong in the matrix hardness. On the other hand, the correlation between the amount of eutectic carbides and wear was small. As for the mechanical properties, the influence of compression proof strength and fracture toughness on the wear resistance was relatively strong.
