After pouring the molten metal into the mould cavity, it is allowed to freeze and cool before the casting in taken out. The solidification process is extremely important since it dictates the structure of the cast metal and hence controls the properties of the casting.
The cooling curve of a metal depicted that the liquid metal cools quickly to the freezing point and then remains at a constant temperature until the metal loses its heat of fusion and solidifies completely. Further cooling occurs only after the solidification process is complete.
In casting, the temperature of the molten metal reaches freezing point first at the mould walls and then the solidification front moves towards the center through the liquid metal.
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