Some Investigations on the Cerium-treated Cast Iron

概要

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The effects of the addition of cerium on the macro- and microstructure of hypoeutectic and eutectic cast iron have been investigated and further, some experiments, were carried out to produce the high strength and rapid-malleable cast iron containing high silicon by the addition of cerium. The results obtained were as follows : (1) With the increase of the cerium content, the structure of cast iron changed from a grey iron to a white iron passing through an inverse chilled iron. When the composition of cast iron was fixed, the amount of cerium necessary to get white cast iron from a deoxidized melt was less than that from an oxidized melt. (2) It was verified that white cast ironization with the addition of cerium was not caused by its alloying such as in the case of manganese or chromium, in which they form special carbides, but by the supercooling of melt accompanied with strong deoxidation by cerium. (3) The mechanical properties of cerium-treated rapid malleable cast iron having the high silicon contents are higher than those of the commercial black heart malleable cast iron, and by controlling the amount of cerium, carbon and silicon in cast iron, the castings of a larger section than the maximum size which has been applied to ordinary malleable cast iron can be made.
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