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← HistoryWhich outcome occurs when early cast iron plowshares experience rapid, repeated mechanical stress?
A)Grain size remains stable
B)Elastic deformation improves strength
C)Brittleness increases via cold working✓
D)Corrosion resistance intrinsically improves
💡 Explanation
Repeated impacts induce dislocations that hinder the movement of iron atoms, causing work hardening. The increased dislocation density raises the hardness, but brittleness increases, therefore the material is more susceptible to fracture, rather than enhancing properties.
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