Abstract
One of the most effective methods of manufacturing CV graphite cast iron is that using the process with treatment by an additive containing titanium (CG alloy). Differing from the conventional graphite spheroidizers or rare earth metals, this alloy contains considerable amount of magnesium, calcium, and silicon, besides titanium. In this study, CV graphite cast iron structure treated with this alloy was investigated, and the precipitation behavior of CV graphite during the eutectic reaction was clarified. Eutectic and eutectoid reactions of CV graphitization by this alloy were similar to those with single addition of equivalent amount of titanium and/or silicon. For the composition range of iron with CV graphite structure, the cooling curve exhibited two plateaus for eutectic reaction. The first was related to the precipitation of spheroidal graphite and the second was to that of CV graphite. The size of CV graphite appears to be on the extension of flake graphite refinement, but there is a great disparity between the two structures.
