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Effect of V and N on Microstructures and Properties of Grade-70 Tire Cord Steel during cold Drawing

Journal of Iron and Steel Research International 2015年第2期22卷 171-178页

作者： Hong-yu LIU Bao-yi WAN Xiao-yu ZENG Chong LIN Hong-jun WANG College of Science Wuhan University of Science and Technology Hubei Province Key Laboratory of Systems Science in Metallurgical Process Department of Physics and Astronomy Clemson University

Commercial grade-70 tire cord steel was microalloyed with V and N to explore the possibility of substitu- ting V for C and the effect of V and N on cementite dissolution during cold drawing process. Tensile strength, elon- gation 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 pha- ses. 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.

关键词： tire cord steel cold-drawn wire cementite dissolution vanadium nitrogen

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