INOCULATION OF NODULAR IRON WITH YTTRIUM SILICIDE NODULIZING AGENT.
Abstract
Although pure metallic yttrium is an effective nodulizing agent for making nodular cast iron, it is too costly for use in production. In the present investigation tests were made using a commercially available yttrium silicide, in which the cost of yttrium is much lower than for the pure metal. Laboratory size induction heats of iron were treated with varying amounts of the silicide by introducing it into the metal stream as the molten iron was tapped out into a ladle. After a standard post-inoculation treatment test bar molds were poured. Satisfactory mechanical properties of 55,000 psi yield strength, 72,000 psi tensile strength and 18% elongation were obtained with silicide additions containing yttrium equal to 0.20% of the charge weight. Raising the tap-out temperature improved the tensile and yield strength but lowered the ductility. Nickel additions also increased strength and hardness at the expense of ductility. Yttrium, like magnesium, showed a tendency to fade or slowly lose its nodulizing effect as the iron is held in the molten condition after treatment. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Apr 01, 1966
- Accession Number
- AD0635466
Entities
People
- Wade C. Wurtz