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<p>The present study systematically investigated the concurrent evolution of microstructure, mechanical properties, and thermophysical characteristics of 0.82C eutectoid pearlitic steel during multi-pass wire drawing. Multi-pass wire drawing of pearlitic steel resulted in a simultaneous increase in strength, ductility, and thermal conductivity (<i>k</i>) up to nominal drawing strain (<i>ε</i><sub>N</sub>) of 0.22. Tensile strength increased with <i>ε</i><sub>N</sub> due to interlamellar spacing refinement and strain hardening, while reduction of area (RA) initially improved up to <i>ε</i><sub>N</sub> of 1.4 and then declined at higher <i>ε</i><sub>N</sub>. Anisotropic behavior in thermal diffusivity (<i>α</i>) and <i>k</i> was observed depending on specimen orientation; the <i>α</i> and <i>k</i> along the longitudinal direction (<i>α</i><sub>L</sub> and <i>k</i><sub>L</sub>) of drawn wire were higher those along across the radial direction (<i>α</i><sub>R</sub> and <i>k</i><sub>R</sub>) over the all drawing strain range. <i>k</i><sub>L</sub> increased with <i>ε</i><sub>N</sub> due to grain elongation and &lt; 110 &gt; texture development, but decreased beyond <i>ε</i><sub>N</sub> of 0.22 as dislocation scattering became dominant. In contrast, <i>α</i><sub>R</sub> and <i>k</i><sub>R</sub> decreased monotonically with <i>ε</i><sub>N</sub> due to grain contraction and increased dislocation density in the radial direction of a wire. Microstructural evolution and literature review confirmed that grain elongation, structure alignment, and developed &lt; 110 &gt; texture during wire drawing are the key factors in enhancing both RA and <i>k</i><sub>L</sub> with <i>ε</i><sub>N</sub>. These findings offer new insights for optimizing cold wire drawing of pearlitic steel by balancing mechanical and thermal properties.</p>

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Simultaneous enhancement of strength, ductility, and thermal conductivity in eutectoid pearlitic steel by wire drawing

  • 期刊论文

  • 发表日期：

    2025年11月14日

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  • Sangbum Woo,
  • Yeo-Jun An,
  • Joong-Ki Hwang

摘要

The present study systematically investigated the concurrent evolution of microstructure, mechanical properties, and thermophysical characteristics of 0.82C eutectoid pearlitic steel during multi-pass wire drawing. Multi-pass wire drawing of pearlitic steel resulted in a simultaneous increase in strength, ductility, and thermal conductivity (k) up to nominal drawing strain (εN) of 0.22. Tensile strength increased with εN due to interlamellar spacing refinement and strain hardening, while reduction of area (RA) initially improved up to εN of 1.4 and then declined at higher εN. Anisotropic behavior in thermal diffusivity (α) and k was observed depending on specimen orientation; the α and k along the longitudinal direction (αL and kL) of drawn wire were higher those along across the radial direction (αR and kR) over the all drawing strain range. kL increased with εN due to grain elongation and < 110 > texture development, but decreased beyond εN of 0.22 as dislocation scattering became dominant. In contrast, αR and kR decreased monotonically with εN due to grain contraction and increased dislocation density in the radial direction of a wire. Microstructural evolution and literature review confirmed that grain elongation, structure alignment, and developed < 110 > texture during wire drawing are the key factors in enhancing both RA and kL with εN. These findings offer new insights for optimizing cold wire drawing of pearlitic steel by balancing mechanical and thermal properties.