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X-Ray Determination of Cerium in Nodular Iron

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The production of nodular cast iron normally requires the addition of small quantities of inoculants to the iron melt in order to induce nodularization of the graphite. Inoculants commonly used are magnesium, and combinations of magnesium and rare earths. A common form of rare-earth additive is commercial Misch-metal alloy which contains primarily cerium with lesser amounts of lanthanum, dysprosium, and samarium. The cerium, in particular, is thought to have a profound effect on nodule formation. These inoculants are usually added in sufficient quantity to result in a retained concentration of cerium in the range of 0.01% to 0.1% of the melt. The melter's objective is to use the minimum amount of relatively expensive inoculant required to obtain the optimum metallurgical structure. Therefore, an accurate control of the final cerium content is essential.

Document Type: Short Communication


Affiliations: 1: Manufacturing Services Laboratory, Ford Motor Company, Dearborn, Michigan 2: Scientific Research Staff, Ford Motor Company, Dearborn, Michigan

Publication date: July 1, 1968

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