Which risk increases during repetitive firing if early Chinese crossbow trigger mechanisms, cast from brittle grey cast iron, were improperly heat treated?

💡 Explanation

Excessive hardness causes increased risk of sear failure by brittle fracture because the pearlitic or iron carbide microstructure concentrates stress, therefore tooth shear is most likely, rather than corrosion or string fraying common in less brittle components.

• Which issue accelerated surface cracking within Mughal-era pietra dura?
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