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← HistoryDuring the late Han Dynasty, which outcome resulted from an increased phosphorus content during early cast iron production?
A)Reduced material tensile strength✓
B)Improved mold casting precision
C)Enhanced corrosion resistance outdoors
D)Higher operational melting temperature
💡 Explanation
Higher phosphorus created iron with greater brittleness because phosphorus segregates to grain boundaries, driving increased Grain Boundary Embrittlement, therefore weakening crystalline bonds; cast iron had reduced tensile capabilities rather than enhanced malleability.
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