Solid morphology and viscosity of semi-solid castiron were investigated using the dual cylinder method in which theinner cylinder is rotated within the crucible. The appearance of liq-uid and solid was examined for a broad range of solid fractions.Structures of dendrite and solid network were produced at highcooling rate, and agglomerated structures formed at low rotationspeed, resulting in a large change of the apparent viscosity of semi-solid cast iron with the change of the cooling rate and rotationspeed. The measured apparent viscosity of semisolid cast iron ispredicted reasonably using the model proposed by Hirai, et al.. Atthe higher solid fraction, the structure was observed to be denser insolid particles in outer region than in the inner one in the crucible.The non-uniform solid distribution was considered to be due to thecentrifugal effect produced by cylinder rotation.
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