Abstract
Bidirectional impact of the undercooling during eutectic solidification of hypoeutectic grey iron on the number of eutectic cells under different cooling rates and nucleation conditions was studied. The causes of this experimental phenomenon were explained by melt heterogeneous nucleation theory combined with the features of actual measured cooling curves. By deeply revealing the physical connotation of solidification undercooling, the undercooling nature and its impact on the solidification parameters were discussed with a wider view of phase transformation driving force and resistance. This discussion not only gives a reasonable explanation to the specific experimental phenomena in more depth, but also applies to a wide range of analysis.
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