Process for the production of semi-solidified metal composition
AssigneeRheo-Technology, Ltd.
InventorsMasazumi Hirai, Katsuhiro Takebayashi, Ryuji Yamaguchi, Yasuo Fujikawa
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Abstract
Semi-solidified metal compositions are stably produced by pouring molten metal into a cooling agitation vessel, agitating it while cooling to produce a slurry of semi-solidified metal composition at a solid-liquid coexistent state and discharging out the semi-solidified metal composition from a discharge port of the vessel. In this case, the cooling agitation is carried out so that a relation of fraction solid, solidification rate and shear rate satisfies the following equation (1) .eta.=a/2(1/f.sub.s -1/f.sub.scr).ltoreq.10 (1).
Claims5
A process for stably producing semi-solidified metal compositions by pouring molten metal into a cooling agitation vessel, agitating it while cooling to produce a slurry of semi-solidified metal composition at a solid-liquid coexistent state and discharging out the semi-solidified metal composition from a discharge port of the vessel, characterized in that the cooling agitation is carried out so that a relation of fraction solid, solidification rate and shear rate satisfies the following equation (1)
- .eta.=a/2(1/f.sub.s -1/f.sub.scr).ltoreq.10 (1)
- wherein .eta. is an indication value of fluidity, a=35000.R.sup.0.5..gamma..sup.-1.7, f.sub.s is fraction solid of the slurry of semi-solidified metal composition, f.sub.scr >f.sub.s, f.sub.scr =0.65-1.4.R.sup.1/3..gamma..sup.-1/3, R is an average solidification rate in the solidification of molten metal below solidification starting temperature (liquidus temperature) (%.s.sup.-1) and .gamma. is a shear rate (s.sup.-1).
Dependencies are inferred from the claim text.