Abstract
A detailed study of magnesium distribution in the microstructure of spheroidal graphite iron was conducted using a Computer Aided Micro Analyzer (CMA). The results showed that magnesium segregated in a halo-like form at the site between the eutectic graphite core and the secondary graphite ring in graphite nodules. The graphite ring was in the form of a three- dimensional graphite shell. The halo-like distribution was concluded to be the trace of a magnesium gas bubble. In this study, the Site Theory has been used as one means of interpreting the data. According to the Site Theory, a magnesium gas bubble in liquid iron functions as the site for the nucleation and growth of spheroidal graphite. Other interpretations of the presented data are welcomed.
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