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← ScienceWhich risk increases when molten metal cools unevenly during solidification?
A)Formation of crystalline microstructures
B)Increased metal corrosion resistance
C)Elevated residual stress concentration✓
D)Improved material ductility under load
💡 Explanation
Increased residual stress results because volumetric changes caused by phase transitions coupled with thermal contraction generate internal strain. This uneven solidification creates stress concentration, therefore leading to premature failure rather than superior ductility or corrosion resistance.
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