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Which consequence follows when early Chinese iron-casting production experienced incomplete fusion?

A)Microstructure leads to brittle failures
B)Surface oxidation reduces strength
C)Hardness increases unexpectedly tenfold
D)Improved corrosion protection occurred rapidly

💡 Explanation

Brittle failures occur because incomplete fusion during casting results in internal porosity, a form of void formation, weakens the metal's structure; therefore the material fractures under stress, rather than exhibiting ductile behavior.

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