Alloy and process for producing and casting ductile and compacte

Details Alloy and process for producing and casting ductile and compacte Alloy and process for producing and casting ductile and compacte

1982-09-15

1984-07-10

Rosenberg, Peter D.

Specialized metallurgical processes, compositions for use therei

Processes

Free metal or alloy reductant contains magnesium

75 53, 75123R, 75123K, 75123L, C22C 3308

Patent

active

044591543

ABSTRACT:
This invention relates to a new and unique alloy composition and to the method of treating molten cast iron with such alloy to produce ductile and compacted graphite cast irons. The alloy is a predominately iron alloy having the essential elements by weight of from about 0.1 to about 10% silicon, from about 0.5 to about 4.0% magnesium, from about 0.1 to about 10.0% nickel and optionally from about 0.1 to about 2.0% cerium, and/or other rare earth elements. The alloy may comprise from about 0.1 to about 10.0% silicon, from about 0.5 to about 4.0% magnesium, from about 0.1 to about 10.0% nickel, optionally from about 0.1 to about 2.0% cerium and/or other rare earth elements, from about 0.5 to about 6.5% carbon and the balance iron. Small amounts of calcium, barium or stronium and trace elements customarily found in conventional raw materials used in producing the alloy may also be present. The characteristics of the alloy make it possible to establish a ready supply of treated molten iron in the foundry in holding vessels with a selected chemical composition at a given temperature. It also makes possible semicontinuous and continuous casting of ductile and compacted graphite cast irons.

REFERENCES:
patent: 3421887 (1969-01-01), Kusaku
patent: 4147533 (1979-04-01), Flinn
patent: 4246026 (1981-01-01), Stefanescu
Trojan & Flinn, "A New Method for Determination of Liquid-Liquid Equilibrium as Applied to One F-C-Si-Mg System", T. Am. Soc. Metals, vol. 54, No. 3 (1961).
Guichelaar et al., "A New Technique for Vapor Pressure Measurement Applied to the Fe-Si-Mg System", Metallurgical Trans., vol. 2, No. 12, pp. 3305-3313 (12/1971).
Guichelaar, "Equilibrium Immiscibility Relations in the Fe-Mg-Si Ternary Liquid System", (U. Mich. Ph.D. dissert. 1969).
Trojan, "Liquid-Liquid Equilibria & Thermodynamic Data for the Fe-C-Si-Mg System", (U. Mich. 1961).
Clark & McCluhan, "Influence of Mg Content on the Nodularizing Efficiency of Mg-FeSi Alloys", Trans. Am. Foundrymens Soc., pp. 442-445, vol. 73 (1965).
Trojan and Flinn, "Fundamentals of Mg Addition to Ductile Iron", Trans. of the Society of Automotive Engineers, vol. 73 (1965).

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