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← HistoryWhich outcome occurs when early Chinese cast iron rapidly cools?
A)Internal stresses promote cracking✓
B)Ductility noticeably improves instead
C)Uniform grain-size distribution results
D)Carbon preferentially forms graphite
💡 Explanation
Internal stresses cause cracking because differential cooling yields uneven contraction, placing some areas in tension rather than uniform shrinkage. Therefore, brittle failure occurs, rather than enhanced ductility or controlled grain size which would reduce internal stresses.
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