Which risk increased during mass-production of Qin dynasty crossbow trigger mechanisms?

💡 Explanation

Rapid production required quicker, lower quality cast iron processing leading to insufficient carbon removal; therefore, metallurgical iron embrittlement cracking became more likely, because increased carbon content reduces grain boundary toughness rather than creep or corrosion.

• When early Chinese iron bridges experienced sag under load, which mechanism critically delayed their structural failure versus similar timber spans?
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• Which effect resulted from slash-and-burn agriculture failing in deforested Mayan lowlands around 800 AD?
• Which distortion increases when projecting celestial coordinates onto a flat astrolabe plate at high latitudes?
• Which consequence resulted from timber bridge supports being consumed by persistent moisture for centuries during the Viking age?
• Which effect limited long section road construction in pre-Roman Europe before 300 BC?