| Many studies on the solidification process of cast iron were reported, but the studios on the melting morphology of cast iron are rare. Therefore, in this work the melting has been done by rapid melting method and melting morphology has been examined, according to graphite shape in cast iron. The main results are summarized as follows: 1. In white cast iron of Fe-C-Si system, melt appears first along the interface between temper carbon and austenite matrix, after the minute temper carbon which was decomposed from Fe₃C diffuses to austenite to eutectic composition. 2. In either hypo or hyper-eutectic gray cast iron, it is observed that the melt appears first at the boundary of eutectic cell. In case of the eutectic gray cast iron, the vicinity of all graphites melts at the same time. 3. In rapidly heated and water quenched specimen of hypereutectic gray cast iron, the crystallization of fine graphites near kish graphite leads to the conclusion that kish graphite does not dissolve easily. 4. In case of nodular cast iron, the boundary between austenite shell and austenite matrix melts first and nodular graphite dissolves very slowly. |
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