Which outcome resulted when iron impurities weakened early cast iron plows used in Chinese agriculture?

💡 Explanation

Premature blade chipping occurred because graphitic formation via graphitization weakened the cast iron microstructure; therefore, the blades fractured before reaching design lifespan rather than achieving intended hardness because high silicon content promoted graphite.

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• Which result occurred when early Chinese military used insufficiently purified saltpeter in gunpowder production?
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