Which structural consequence results when inadequately heat-treating wrought iron chains used in suspension bridges?

💡 Explanation

When wrought iron is not adequately heat-treated, the grain structure remains coarse, resulting in elevated ductile-brittle transition temperature because impurities remain segregated at grain boundaries, causing brittle fracture at lower temperatures. Therefore, brittle failure increases at lower temperatures, rather than corrosion, tensile strength reduction, or creep which involve different thermal processes.

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