Effect of cerium on the as-cast microstructure of a hypereutectic high chromium cast iron

The effect of cerium element on the as-cast microstructure of a hypereutectic high chromium cast iron (HCCI) containing 4.0 wt.% C and 20.0 wt.% Cr was studied by means of optical microscopy (OM), scanning electron microscopy (SEM) and energy dispersive X-ray spectrometry (EDS). The results indicate that the primary M7C3 carbides are refined and spheroidized with the addition of suitable amount of cerium. Ce2O2S is found in the primary carbide. The mechanism of Cerium modification on microstructure of the alloy is also discussed. (c) 2008 Elsevier B.V. All rights reserved.