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Efeito da Pre Inoculação com SiC

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may be summarized as follows:
1. Residual magnesium level and calculated magnesium recovery are much higher in those heats utilizing SiC as
furnace additions. With the same 4.5-lb (1.8%) FeSiMg-masteralloy additions, the SiC heats averaged 21% higher residual
magnesium (0.032% vs 0.039%). Those heats produced with SiC, but using reduced FeSiMg-masteralloy additions (1.6%
masteralloy) still resulted in higher residual magnesium then in heats using FeSi75 pre-inoculant and standard FeSiMg
masteralloy additions. The latest opens the possibility to reduce consumption of FeSiMg masteralloy.
2. Heats, pre-inoculated with SiC and treated with lower FeSiMg-masteralloy additions, showed high castability and
lowest percentage of iron carbides. Trial heats using SiC and standard FeSiMg-masteralloy additions exhibited the greatest
amount of iron carbides due to the considerably higher residual Mg levels. Thin wall ductile iron plates pre-inoculated with
SiC and treated with reduced addition of FeSiMg-masteralloy always showed the highest nodule count
3. These experiments confirmed previous works indicating the important role of residual magnesium on as-cast
structure and castability of ductile iron.
REFERENCES
1 T. Benecke, A. T. Ta, G. Kahr, W. D. Schubert, and B. Lux “Dissolution behavior and pre-inoculation effect of SiC in
gray cast iron melts” Elektroschemelzwerk Kempeten GmbH., Munchen, Germany (1987)
2. T. Benecke, S. Venkateswaran, W. D. Schubert, and B. Lux “The investigation of the influence of silicon carbide in
production of ductile iron” Elektroschemelzwerk Kempeten GmbH., Grefrath plan, Austria, (1993)
3. S. Venkateswaran, J. Wilfing, W. D. Schubert, B. Lux, and T. Benecke “Influence of SiC and FeSi75 additions on the
microstructure, cooling curve and shrinkage porosity of ductile iron” Paper presented at the Fourth International
Symposium on the Physical Metallurgy of Cast Iron, Tokyo (1989)
4. Y.S. Lerner, T. Frush, “Counter-Gravity Casting of Thin Wall Ductile Iron”, Proceedings of The Ductile Iron Society’s
1998 Keith D. Millis Symposium on Ductile Iron,SC, Hilton Head, pp.313-446. (1998)
5. Ductile iron. Molten metal. Processing American Foundrymen’s Society, Inc Des Plaines, Illinois USA (1986)
6. Ductile iron. Production. QIT – Fer et Titane Inc., Canada, pp 10-11. (1992)
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