The capability of the molten metal to fill mold is called fluidity; it consists of two basic factor: (1)characteristics of the molten metal, and (2)casting parameters. The following characteristics of molten metal influence fluidity:
a.viscosity
b.surface tension
c.inclusion
d.solidification pattern of the alloy
The following casting parameters influence fluidity and also influence the fluid flow and thermal characteristics of the system:
a.mold design
b.mold material and its surface characteristics
c.degree of superheat
d.rate of pouring
e.heat transfer