Which consequence resulted when the composition of early Chinese cast iron armour lacked sufficient manganese?

💡 Explanation

Brittle fracture risk increased because iron carbide destabilization occurred due to inadequate manganese inhibiting sulfur's effects, triggering intergranular weakness. Therefore, force concentrated at grain boundaries, rather than distributed throughout the metal, resulted catastrophic material failure.

• Which outcome resulted from Aztec chinampa construction limiting aquatic foraging grounds?
• Which environmental benefit accrued when the chinampa cultivation system expanded in Tenochtitlan's construction?
• Which mechanism explains the increased accuracy of Islamic astronomical observations after introduction of trigonometry?
• Which structural failure increases in timber-framed windmills when grain dust accumulates excessively inside the mill housing?
• Which outcome follows when Roman road aggregate undergoes repeated freeze-thaw cycles?
• Which increased risk accompanied Harrison's chronometers aboard ships?