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← HistoryWhich outcome occurs when early cast iron cannons experience rapid firing?
A)Formation of thermal stress cracks✓
B)Reduced muzzle velocity achieved
C)Increased misfire incidence rate
D)Premature rifling groove degradation
💡 Explanation
Thermal stress cracks appear in cast iron cannons under rapid firing because non-ideal cooling causes rapid temperature gradients, intensifying thermal stress within the metal. This exceeds the yield strength, therefore cracks propagate rather than the other options influencing immediate performance.
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