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← HistoryWhich outcome arises when a thin section of inferior historically cast iron cools unevenly?
A)Increased material tensile strength
B)Formation of white cast iron
C)Extensive internal stress cracking✓
D)Improved corrosion resistance develops
💡 Explanation
Extensive internal stress cracking is the consequence caused by differential contraction, because faster cooling introduces higher stress through thermal gradients. The mechanism is transient thermoelasticity; therefore cracking increases the risk, rather than developing martensite formation or improved strength.
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