Which consequence resulted when ancient Chinese crossbow triggers contained elevated sulfur impurities during their cast iron production?

💡 Explanation

Hydrogen embrittlement increased because the elevated sulfur content in cast iron promoted the diffusion of atomic hydrogen at the grain boundaries. Therefore, the trigger material weakened severely due to stress cracks, rather than corrosion or string failure which would not occur due to sulfur related material defects.

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• Which limitation resulted from early cast iron crossbow trigger mechanisms?
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