Which mechanism caused early cast iron Chinese crossbow triggers to fail faster than later bronze versions?

💡 Explanation

Grain boundary carbide precipitation embrittles cast iron because carbon diffuses along grain boundaries and forms brittle carbides, therefore triggers failed readily under stress, rather than the gradual wear of homogenous bronze.

• Which structural weakness increased the risk of collapse of a Roman castrum wall segment during prolonged siege?
• Which consequence results from inaccurate approximations during medieval Islamic hydraulic system design?
• Which consequence arises when the Byzantine purple dye production faces scarcity of murex snails?
• Which consequence results when intensive chinampa cultivation reduces topsoil's salinity?
• Which agricultural risk increased as chinampa farming intensified within the Aztec Triple Alliance?
• Which innovation followed algorithmic design applied to irrigation systems during the Islamic Golden Age?