THE TEXTURE EVOLUTION AT THE CENTER OF PEARLITIC STEEL WIRE DURING DRAWING AND ITS INFLUENCE ON THE MECHANICAL PROPERTIES
ZHAO Tianzhang1, SONG Hongwu1, ZHANG Guangliang2, CHENG Ming1, ZHANG Shihong1()
1 Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016 2 Taizhou University, Taizhou 318000
Cite this article:
ZHAO Tianzhang, SONG Hongwu, ZHANG Guangliang, CHENG Ming, ZHANG Shihong. THE TEXTURE EVOLUTION AT THE CENTER OF PEARLITIC STEEL WIRE DURING DRAWING AND ITS INFLUENCE ON THE MECHANICAL PROPERTIES. Acta Metall Sin, 2014, 50(6): 667-673.
The cold drawing pearlitic steel wires are widely used in industry such as the automobile tire and ropes. And it possesses an ultra high strength, almost the highest in all the steel products. So many investigations are focused on the hardening mechanisms of pearlitic steel wire during cold drawing, including the microstructure fining, texture evolution and cementite dissolution. In this study, the electron backscatter diffraction (EBSD) and the visco-plastic self-consistent (VPSC) model are used to investigate the texture evolution law at the center of wire during the drawing, as well as its influences on the mechanical behaviors. The EBSD results show that the as-received wires after dry drawing and quenching have a little <110> fiber texture along the drawing direction. And with wet drawing strain increasing, the intense of <110> fiber texture increases apparently. The calculations using VPSC have a good agreement with the EBSD results, which indicate that VPSC can successfully predict the texture category and its evolution law in pearlitic steel wire during drawing. The predictions show that the <110> fiber texture is gradually generated at the center of wire with strain increasing and exhibit the path of individual orientation in the inverse pole figures during the drawing. The orientations at the line linking <113> and <012> seem stable. The orientations located at the line linking <001> and <111> prefer to turn to the stable orientations and then turn to <110>. The other orientations turn to <110> directly. The volume of <110> orientations within 15 degrees of drawing direction increases with strain increasing and get saturation finally. The tensile yield stress of the wire center increases with the initial volume of <110> fiber texture increasing.
Fund: Supported by NV Bekaert SA (Belgium), National Natural Science Foundation of China (No.51034009) and Strategic Cooperation Project between Guangdong Province and Chinese Academy of Sciences (No.2012B091100251)
Fig.1 Sketch of the position for EBSD (a) and the real measurement area for as-received wire (b)
Condition
Diameter / mm
Area reduction / %
Strain
As-received
0.82
-
-
3 passes
0.61
45
0.59
5 passes
0.52
60
0.91
Table 1 Steel wire samples in experiment
Fig.2 Strain-stress curve of the steel wire and the micro-hardening curve used in visco-plastic self-consistent (VPSC) model
Fig.3 Inverse pole figures of steel wire center before (a) and after 3 passes (b) and 5 passes (c) drawings
Fig.4 Inverse pole figures predicted by VPSC under equivalent strains of 0 (a), 0.3 (b), 0.6 (c), 0.9 (d), 1.2 (e), and movement path of the individual orientation (f)
Fig.5 Evolution of the volume fraction of <110> fiber texture in drawing direction and its increasing rate with strain increasing
Fig.6 Fig.6 Influence of the <110> fiber texture on mechanical properties of steel wire
(a) evolution of yield locus in π plane with strain
(b) tensile curves with different volume of the initial <110> fiber textures
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