When gunpowder crossbow technology was evolving, which risk increased in the creation of cast iron crossbow trigger mechanisms?

💡 Explanation

Rapid cooling of cast iron crossbow triggers lead to increased thermal stress because differential contraction creates micro-fractures during solidification. Therefore, embrittlement risk is higher, rather than manganese depletion or silicon phases that pertain to composition control during preparation.

• Which outcome resulted from differential cooling during early Chinese cast iron crossbow trigger production?
• Which consequence resulted from carbon levels exceeding threshold in early iron smelting?
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• Which optical consequence affected early camera obscura image quality derived from a single, uncoated plano-convex lens?
• Which mechanical risk increased along Roman roads when spring thaw saturates the ground supporting the via strata?