Abstract
Batch of dropper wires in the power supply system of a subway line fractured in the past several years. The dropper wires are made of soft stainless steel wire (Grade 304) with a diameter of 3.0 mm. The subway line in which the dropper wires often fractured is built near the sea. In this work, failure mechanism of the fractured dropper wires was explored based on the macro- and micro-examinations. Several technologies including scanning electron microscopy and energy-dispersive x-ray spectroscopy were utilized to reveal the mechanism. The failure mechanism of the dropper wires is considered as fatigue fracture. Its chemical composition and mechanical properties meet the standard of 304 stainless steel. The microstructure of the failed dropper wires is normal. Influence of the corrosive environment promotes the initiation of the fatigue cracks.
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