Microstructure and properties of monotectic Cr—Cu cast irons

AbstractA metal quasi-composite, containing copper inclusions within a chromium cast iron matrix was investigated. The dispersion of Cu particles was produced directly from the melt by cooling through the miscibility gap. The effect of casting parameters (pouring temperature and cooling rate) on the size and distribution of Cu particles has been studied using optical metallography, SEM, and TEM. It has been shown that Cu particles are responsible for improved machineability and wear resistance of Cr cast irons with 10 -12 wt-%Cu, since Cu particles break up the network of primary carbides and also act as a solid lubricant.