Abstract
The effect of spray-cooling on heat-checking revealed that a water-based release agent has a stronger effect in the crack extension stage than an oil-based release agent has. On the basis of the mode II mechanism of fracture mechanics explaining the crack initiation and propagation of heat-checking, the influence of the intensity of the cooling-spray was investigated through a casting-solidification simulation and an FEM elastic-plastic stress analysis. The surface strain analysis of the die for a flat shape part revealed that the initiated crack widens with repeated thermal expansion and contraction. The water-based release agent shows larger strain-amplitude at the die surface than the oil-based release agent shows, and thus is liable to cause heat-checking.
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