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← HistoryWhich outcome occurs when crucible cast iron cools relatively quickly?
A)White cast iron forms✓
B)Graphite nodules precipitate freely
C)Austenite grain boundary sliding occurs
D)Ductile iron forms predictably
💡 Explanation
White cast iron forms because rapid cooling promotes cementite's (iron carbide, Fe3C) formation via rapid solidification, suppressing graphite precipitation due to limited diffusion during solidification. This produces a hard, brittle material, rather than a softer, graphitic structure.
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