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← ScienceWhich risk increases when molten steel exits a blast furnace?
A)Rapid phase change embrittles surface✓
B)Sulfur contamination decreases impact toughness
C)Increased carbon induces brittle fracture
D)Hydrogen weakens steel grain boundaries
💡 Explanation
The rapid cooling causes **martensitic transformation**, which increases the steel's hardness, but also embrittles it because the crystal structure changes rapidly. Therefore, a quench leads to surface cracking, rather than embrittlement from elemental contaminants at lower levels.
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