Abstract
The properties of nodular ductile cast iron are strongly influenced by morphology, size and distribution of graphite particles. Nodular ductile irons have spheroidal graphites in the as-cast state. In this work, these nodules are characterized by means of light optical microscopy (LOM) and electron microscopy (EM). Experimental data are represented by LOM. Metallography is processed to obtain an image where the graphite nodules are clearly distinguished from the similar inclusions which make doubts in microstructure characterization; this is formed by completely unconventional procedures. EM was used to show more clear aspects of granular graphite in cast irons. These data can provide a valid support towards a more confident quality control in the ductile iron production.
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