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← ScienceWhich consequence typically results when quenching steel from austenite?
A)Martensite formation increases, promotes brittleness✓
B)Retained austenite raises impact toughness
C)Ferrite content increases, lowers hardness
D)Cementite precipitation toughens grain boundaries
💡 Explanation
Rapid cooling transforms austenite to martensite via diffusionless transformation, increasing hardness but also susceptibility to cracking because the new, distorted crystal structure created by martensite causes brittleness rather than maintaining phase ductility.
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