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← TechnologyWhich outcome occurs when residual stress exceeds tolerance during centrifugal casting?
A)Mechanical cracking emerges locally✓
B)Increased grain size is observed
C)Improved dimensional stability results
D)Dendritic arm spacing increases marginally
💡 Explanation
Mechanical cracking appears locally because the **stress corrosion cracking** mechanism initiates at grain boundaries when residual tensile stress interacts with a corrosive foundry environment; therefore, cracking appears rather than dimensional stability because yielding cannot relieve the high stress fast enough.
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