A New Look At Nodulizing Ductile Iron With Yttrium and Mischmetal Additives.
82D Casting Cong & Expo Am Foundrymen's Soc Detroit Mich 4/78 86(78-60):18 pages
The Bureau of Mines, U.S. Department of the Interior, investigated the potential of using ferroyttrium and mischmetal as low-flaring and fuming agents for nodulizing ductile iron. Three experimental ferroyttrium alloys of varying composition and purity were evaluated in induction-melted heats. Mischmetal and mischmetal silicide of commercial or experimental origin were also assessed. With appropriate processing conditions, 1-inch keel-block castings exhibiting over 65,000 psi tensile strength, 45,000 psi yield strength, and 15 to 20 pct elongation can be produced with either yttrium or mischmetal, although the latter is preferred from a cost standpoint and the lesser sensitivity to the precise amount added and inoculation requirements.
Issue of Publication
82D Casting Cong. & Expo., Am. Foundrymen's Soc., Detroit, Mich, 4/78, V 86, No 78-60, Pp 249-66