Abstract
BY adding magnesium to cast iron in such a way that a few hundredths of a per cent are retained in solution it is possible to suppress the stable eutectic reaction, and in iron so treated the metastable reaction occurs instead, resulting in castings which contain large amounts of iron carbide. Addition (after the magnesium has been dissolved) of about 0.5 per cent of ferro-silicon (containing 80 per cent silicon) favours occurrence of the stable eutectic reaction during subsequent solidification, and spheroidal-graphite particles are so produced1. The ferro-silicon alloy inoculates the stable eutectic.
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References
Brit. Pat. 630,070.
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GITTUS, J. Promoting the Stable Eutectic Reaction in Magnesium-treated Iron Castings by Vibration during Solidification. Nature 181, 1004–1005 (1958). https://doi.org/10.1038/1811004b0
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DOI: https://doi.org/10.1038/1811004b0
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