It is difficult to cool thick castings fast enough to solidify the melt as white cast iron all the way through.
3.
This hard, brittle compound dominates the mechanical properties of white cast irons, rendering them hard, but unresistant to shock.
4.
Either white cast iron or refined iron is then placed in hearth of the furnace, a process known as " charging ".
5.
However, rapid cooling can be used to solidify a shell of white cast iron, after which the remainder cools more slowly to form a core of grey cast iron.
6.
The broken surface of a white cast iron is full of fine facets of the broken iron-carbide, a very pale, silvery, shiny material, hence the appellation.
7.
Unless the raw material used is white cast iron, the pig iron or other raw product of the puddling first had to be refined into refined iron, or finers metal.
8.
Cort's process ( as patented ) only worked for white cast iron, not desiliconise the metal, leaving a white brittle metal, known as'finers metal '.
9.
Henry Cort's original puddling process only worked where the raw material was white cast iron, rather than the grey pig iron that was the usual raw material for finery forges.
10.
The alloy constituents affect its colour when fractured : white cast iron has carbide impurities which allow cracks to pass straight through; ductile cast iron has spherical graphite " nodules " which stop the crack from further progressing.
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