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The physical structure of a crystalline material is largely determined by the method of cooling and precipitation of the molten metal.
During the pouring process, metal in contact with the ingot walls rapidly cools and forms either a columnar structure, or possibly a "chill zone" of equiaxed dendrites , depending upon the liquid being cooled and the cooling rate of the mold.
For a top-poured ingot, as the liquid cools within the mold, differential volume effects cause the top of the liquid to recede leaving a curved surface at the mold top which may eventually be required to be machined from the ingot.
The rate of front advancement controls the time that dendrites or nuclei have to form in the solidification region. The width of the mushy zone in an alloy may be controlled by tuning the heat transfer properties of the mold, or adjusting the liquid melt alloy compositions.
Continuous casting methods for ingot processing also exist, whereby a stationary front of solidification is formed by the continual take-off of cooled solid material, and the addition of molten liquid to the casting process.
Approximately 70 percent of aluminium ingots in the U. A total of 5 percent of ingots must be scrapped because of stress induced cracks and butt deformation.
Ancient copper oxhide ingot from Zakros, Crete. The ingot is shaped in the form of an animal skin, a typical shape of copper ingots from these times.
Molds for Chinese sycee , a form of silver and gold ingots used as currency under the empire. Pig iron ingot from Norrhyttan, Dalarna , Sweden.
Plano-convex ingots are widely distributed archaeological artifacts which are studied to provide information on the history of metallurgy. From Wikipedia, the free encyclopedia.
Overview of Recycled Copper. Brass world publishing co. Retrieved 24 February Review of American chemical research. C; Wulff, John John Wiley and Sons.
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