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← ScienceWhich outcome occurs when cooling molten steel too rapidly?
A)Undesirable martensite phase transformation occurs✓
B)Austenite grains become excessively large
C)Dendritic growth is completely suppressed
D)Equilibrium phases shift towards ferrite
💡 Explanation
Rapid conduction quenches the steel before pearlite formation; shear stress causes diffusionless Martensite transformation to occur, because carbon atoms are trapped. Therefore, Martensite happens rather than bainite, and this requires specific high-cooling-rate conditions.
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