C - Chemistry – Metallurgy – 22 – C
Patent
C - Chemistry, Metallurgy
22
C
75/1, 53/342
C22C 1/00 (2006.01)
Patent
CA 1083854
ABSTRACT OF THE DISCLOSURE A metal composition characterized by greater than about 65 weight percent degenerate denritic or nodular primary discrete solid particles suspended in a secondary phase having a lower melting point than the primary particles and which secondary phase can be solid or liquid. The method involves raising the temperature of a metal alloy to a value at which the alloy is largely or completely in the molten state. The melt is then subjected to vigorous agitation in an apparatus having an inner surface contacting the liquid-primary solid composition that is not wet by the composition and the heat is extracted to increase the portion of the mixture is in solid degenerate dendrite or nodular form greater than about sixty-five percent while continuing the agitation. The upper limit of primary solids depends upon the size of the primary solids and the composition and is reached when the liquid phase ceases to be continuous so that the primary solids no longer slide along their boundaries and wherein there is sufficient fusion of the primary solids to each other which prevents the solids from sliding along their boundaries when the composition is subjected to shear forces. Apparent viscosity of the liquid-solid mixture is continuously monitored and the measurement is used to control the residence time of the liquid-solid mixture in the agitation zone wherein heat is extracted. During agitation, pressure differential in the agitation zone can be utilized to augment maintenance of the con- tinuous flow of the metal composition through the agitation zone. At this juncture, the temperature of the liquid-solid composition can be reduced to cause complete solidification thereof or it can be cast or formed directly. The solidified composition can be stored and later it can be brought again to the liquid-solid mixture and then recast or formed, e.g. forging, pressing, extruding or rolling.
287218
Flemings Merton C.
Reik Rodney G.
Young Kenneth P.
George H. Riches And Associates
Massachusetts Institute Of Technology
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