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1 Archives of Foundry Engineering

1 2009

1 Górny M.

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Mechanism of silicon influence on chills in ductile iron

100%

Górny M.

2009

tom Vol. 9, iss. 1

147-150

In the present work an analytical expression that combines the susceptibility of liquid cast iron to solidify according to the Fe-C-X metastable system (also known as the chilling tendency of cast iron, CT) is proposed. A relationship between CT and several factors has been developed. In particular the CT is related to the critical wall thickness (Scr), below which the chill is formed. Theoretical calculations of Scr were made and then compared with experimental outcome for ductile iron melts. The predictions of the theoretical analysis are in rather good agreement with the experimental data.The results can be used as a guide for a better understanding of the effect of technological variables such as the melt chemistry, the holding time and temperature, the spheroidizing and inoculation practice, the resulting nodule count and the type of mold material and pouring temperature, on the resultant chill of the ductile iron.