AFS Library

METALLURGY OF CAST IRON AS RELATED TO THE MELTING PROCESS

19731023
Journal: Available as Modern Casting Tech. Report No. 7313, $3.00
Author: W.H. Moore

An effort is made to show that graphite contained in the metallic charge materials has an effect on chill value and on nucleation as expressed by the eutectic cell count. A sharp distinction is drawn between cupola melting, where this graphite is controlled by the selection of the original charge material and electric melting, where graphite nucleating effect i controlled by manipulating of the superheat temperature of the bath. It is demonstrated that the chill value in electric melting can change very rapidly, so that close control of superheat temperature becomes mandatory. Electric melting involves sufficient superheat to dissolve all graphite and eliminate its nucleating effect, but, at the same time, insufficient superheat to result in severe chill increase.



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