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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,apeak(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 0.086mass% V.
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. Sensile 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, apeak (increasing first and then decreasing) 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 i s low. 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 0.086mass% V.