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Which mechanism MOST significantly impacted the longevity of cast iron agricultural tools from 18th-century Rotherham?

A)Cementation controlled carbon content
B)Annealing prevented crack propagation
C)Hot dipping altered surface hardness
D)Quenching increased material strength

💡 Explanation

Controlling carbon content via Cementation influenced the iron's hardness and brittleness due to reduced formation of iron carbide precipitation at grain boundaries. It decreased brittleness and increased strength; therefore tools lasted longer, rather than failing under stress from being too carburized.

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