6/1/2023 0 Comments Cast metal cooling![]() On further solidification, crystals grow with their axes perpendicular to the mould and these are columnar in shape (Fig. ![]() The crystals near the mould walls are small and equiaxed (i.e. So the crystals start to grow from the mould walls and the process continues as more heat is lost, with crystals growing inwards until the whole of the metal has solidified. It is provided by the walls of the mould, which provide sites around which crystals can grow initially and subsequently, by the solidified particles and the metal itself. Since, solidification requires energy to produce a crystalline structure, some super cooling (cooling below the freezing point) is required before the liquid starts to solidify. is essential to predict, how the casting will solidify and thus avoid casting defects like seams, gas porosity, hot tears etc. A thorough understanding of the mechanism of solidification, the rate of heat loss from the material to the mould etc.
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