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← ScienceWhich outcome results when molten steel cools unevenly during casting?
A)Residual stress increases tensile strength
B)Grain boundary segregation will be maximized
C)Work hardening uniformly strengthens volume
D)Dendritic growth leads to micro-segregation✓
💡 Explanation
Dendritic growth occurs because directional solidification leads to uneven solute distribution at the solid-liquid interface during the phase change. This causes micro-segregation during local solidification, therefore compositional variations, rather than uniform hardening as the heat extraction happens at varying rates.
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