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← HistoryWhich consequence arises from thermal shock during rapid quenching of freshly cast bronze cannons?
A)Controlled precipitation hardening increases strength
B)Uniform microstructure eliminates impurities
C)Internal stresses induce cracking failures✓
D)Improved ductility eases barrel rifling
💡 Explanation
Rapid cooling causes differential contraction, leading to thermal stress concentration—the mechanism called thermal stress—within the cannon's material. Therefore, cracking is the outcome because tensile stresses exceed material strength rather than beneficially altering material properties.
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