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| Effect of V and N on Microstructures and Properties of Grade-70 Tire Cord Steel during Cold Drawing |
| Hong-yu LIU1,2,Bao-yi WAN1,Xiao-yu ZENG3,Chong LIN1,Hong-jun WANG1 |
1. College of Science,Wuhan University of Science and Technology, Wuhan 430065, Hubei, China
2. Hubei Province Key Laboratory of Systems Science in Metallurgical Process, Wuhan 430065, Hubei, China
3. Department of Physics and Astronomy, Clemson University, Clemson 29634, South Carolina, USA |
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Abstract Commercial grade-70 tire cord steel was microalloyed with V and N to explore the possibility of substituting V for C and the effect of V and N on cementite dissolution during cold drawing process. Tensile strength, elongation and torsion laps of cold-drawn wires were determined. Microstructures of secondary phases were studied by transmission electron microscopy (TEM) and energy dispersive spectroscopy (EDS). Saturation magnetization was measured by using a vibrating sample magnetometer (VSM) to evaluate cementite dissolution during cold drawing process. Experimental results showed that with the increase of V content, tensile strength increased, elongation slightly decreased, and the torsion laps of the cold-drawn wires decreased. Results also showed that with the increase of N content, a peak (increasing first and then decreasing) appeared in the tensile strength graph, and an increase of elongation and a decrease of torsion laps of the cold-drawn wires occured. N is soluble in ferrite when its content is low. The increase in the content of N to 82��10-6 will result in the precipitation of the V-containing secondary phases. Also, cementite tended to be stable during cold drawing process with the increase of V and N contents. Grade-80 tire cord steel can be replaced by grade-70 tire cord steel microalloyed with 0. 086 mass% V.
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Received: 21 November 2013
Published: 02 February 2015
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Corresponding Authors:
Hong-Yu Liu
E-mail: liuhongyu@wust.edu.cn
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2015, Vol. 22 
