Abstract
Effects of casting variables on structures and tensile properties of ceramic shell mold castings were studied using plate-shaped specimens. Structures and tensile properties were almost uniquely correlated to the effective moduli of the castings calculated from their edge effect distances. As for effects of test piece sampling positions, there was a sharp drop in tensile strength elongation and reduction of area at the border between the edge effect zone and the defect zone, with a gradual increase towards the riser effect zone. When the effective moduli of the castings were increased by the effects of such casting variables as pouring temperature or ceramic fiber covering, the castings were prone to show more uniform tensile properties throughout, and to show slightly lower tensile properties in the sound zones. There was no difference in tensile properties between the edge effect zones and the riser effect zones.
