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.

• Within Mughal-era pietra dura inlay at the Taj Mahal, which outcome occurred due to differential thermal expansion?
• Which outcome resulted from masonry quality in pre-Roman Mycenae?
• Which outcome arises from inaccurate keying of stones during early Inca ashlar masonry construction?
• Which consequence results when ancient Chinese iron-casting temperatures are excessively low?
• Which risk increases when facing stones with sedimentary layering for load-bearing courses during Inca building projects?
• Which material degradation process reduced longevity for exterior Mughal 'pietra dura'?