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1 Journal of Achievements in Materials and Manufacturing Engineering

1 2015

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Ductility improvement of high carbon steel by alternate wire drawing method

Nagashima H., Yoshida K.

Journal of Achievements in Materials and Manufacturing Engineering

2015

Vol. 70, nr 1

29--35

Purpose: High carbon steel wires have been widely used in industrial products such as bridge cables and steel cords for automotive tires due to their high mechanical strength and high fatigue characteristics. The wires are expected to have higher strength and smaller diameter in the future. Wire drawing is carried out to measure up to these requirements. However, after the processing, tensile strength increases, but ductility decreases due to the shear deformation on the wire surface. This research focuses on increasing the ductility for high carbon steel wires for production. Design/methodology/approach: As a process for obtaining wires with high strength, high ductility, and high fatigue strength, “alternate drawing” is proposed. Alternate drawing is a wire drawing process where the direction of the material flow is changed every few passes. Findings: And tensile test, torsion test, FEM analysis, and bending test were carried out to investigate the effect on alternate drawing on the ductility of the drawn wire. And then the results were compared with those of wires processed by conventional drawing. It is revealed that mechanical properties of wires processed by alternate drawing have been improved by the decrease of additional shear- strain accumulation on the wire surface portion. Research limitations/implications: This research is focused on the improvement of ductility, so in it the future we hope to achieve even lower drawing diameters and make finer wires. Practical implications: These fine high carbon steel wires could be used for making steel cord for vehicle tires, production of springs and production of steel ropes for industrial purposes. Originality/value: This paper is based on a previous research from Tokai University’s Yoshida Laboratory, but all the experiments and results were conducted by me.