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《Electroplating & Finishing》 2015-07
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Study on necking fracture of brass-coated steel wire produced by heat diffusion electroplating during wet drawing

QIAN Qing-sheng;Technology Center of Jiangsu Xingda Steel Tyre Cord Co., Ltd.;  
To find out the cause of necking fracture during wet drawing of brass-plated steel wires, their microstructures and coating's phases in cases of normal and abnormal wet drawing were studied by scanning electron microscope, energy-dispersive spectrometer, and X-ray diffractometer, and their mechanical properties were tested by tensile testing machine. The results showed that the microstructures of both brass-plated steel wires are pseudo-eutectoid pearlite, no abnormal proeutectoid ferrite or spherical cementite are found, and there is no distinctive difference in mechanical properties between them. The mass fraction of β-brass phase is up to 24% in the coating of the brass-plated steel wire abnormally wet drawn, which is 6 times as large as that in the coating of normally drawn steel wire. The excessive mass fraction of hard and fragile β-brass phase in the coating is the key factor that leads to necking fracture, while the microstructure and mechanical properties of brass-plated steel wire are fine. The wire fracture rate is reduced from 5.0 times per ton to 0.1 time per ton during wet drawing by redoing heat diffusion treatment of the abnormal steel wire at a specified temperature.
【CateGory Index】: TQ153;TG142.15
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