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THERMAL BEHAVIOR OF METALLIC MOLDS WITH LONG FREEZING RANGE ALLOYS

3508
Journal: Transactions of the American Foundrymen's Society V 72 P 65-72, 1964 (8 p)
Author: Panchanathan, V, Seshadri, M R and Ramachandran, A

The thermal behavior of cast iron and anodized aluminum molds during solidification of aluminum- 4.5 per cent copper and aluminum-10 per cent magnesium, long freezing range alloy, test castings have been studied. It is found that: a) For the casting and mold wall thickness considered (1) test castings solidify akin to a skin forming alloy, (2) the solidification constant increases with the increase in the mold wall thickness and (3) solidification time of test castings is approximately proportional to square of volume/surface area ratio. b) In general, start of air gap formation takes place earlier in cast iron mold compared to anodized aluminum. c) The maximum interface temperature attained in a just and over sufficient mold is dependent upon (1) start of air gap formation, and (2) percentage of solids formed prior to air gap formation. d) The maximum interface temperature attained in an under sufficient mold is primarily influenced by the start of air gap formation time. e) Heat capacity effect on the interface temperature is reflected upon only at later stages of freezing.



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