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← TechnologyWhich dimensional effect results when a sand casting mold experiences uneven volumetric thermal contraction?
A)Permanent shape distortion occurs✓
B)Uniform hardness remains unchanged
C)Microscopic cracks heal rapidly
D)Dendritic growth is unaffected
💡 Explanation
Casting shrinkage induces stress; where uneven cooling alters density via differing solidification paths. This causes permanent deformation because plastic deformation occurs where stress exceeds the material yield strength, therefore distortion, rather than uniform properties or microstructure healing.
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