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← ScienceWhich outcome occurs when rapid cooling induces crystallization while quenching molten steel?
A)Increased martensite formation and hardness✓
B)Austenite grains coarsen significantly
C)Cementite precipitation is accelerated
D)Ferrite phase transformation stops entirely
💡 Explanation
Rapid cooling bypasses equilibrium phase transformations; *diffusionless transformation* directly forms martensite contributing to drastically increase hardness because carbon atoms are trapped inhibiting dislocation movements, therefore higher hardness rather than equilibrium product development, in contrast of slow cooling.
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