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<p>The microstructural evolution of ferrite and the cementite phase individually and in the pearlitic colonies occurs due to the wire drawing process. Thinning happens in favorably oriented pearlitic colonies with lamellae aligned along the wire axis, forming a&#xa0;fibrous structure. In contrast, the unfavorable colonies with lamellae oriented perpendicular to the wire axis undergo bending and kinking in aligning themselves with the wire axis. The mean random interlamellar spacing (mean <i>S</i>) of the transformed pearlite subjected to prior cold working decreases compared to the undeformed sample after heat treatment involving austenitization followed by isothermal pearlite transformation. However, no further refinement in mean <i>S</i> occurs in transformed pearlite above the drawing strain of 0.46. The pre-cold-drawn samples isothermally transformed back to pearlite after austenitization and show lower hardness than the undeformed ones subjected to the same heat treatment despite having lower mean spacing. The mean <i>S</i> decreases with an increase in the austenitization temperature of the near eutectoid steel with a&#xa0;fully pearlitic microstructure, which increases hardness. However, no significant change was observed in mean <i>S</i> value and hardness for the highest degree of pre-cold-drawn isothermally transformed pearlite with increased austenitization temperature.</p>

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Effect of Austenitization Treatment on Transformed Pearlite Microstructure of Cold Drawn Near Eutectoid Steel

  • 期刊论文

  • 发表日期：

    2025年5月29日

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  • Ipsa Tripathy,
  • Shiv Brat Singh

摘要

The microstructural evolution of ferrite and the cementite phase individually and in the pearlitic colonies occurs due to the wire drawing process. Thinning happens in favorably oriented pearlitic colonies with lamellae aligned along the wire axis, forming a fibrous structure. In contrast, the unfavorable colonies with lamellae oriented perpendicular to the wire axis undergo bending and kinking in aligning themselves with the wire axis. The mean random interlamellar spacing (mean S) of the transformed pearlite subjected to prior cold working decreases compared to the undeformed sample after heat treatment involving austenitization followed by isothermal pearlite transformation. However, no further refinement in mean S occurs in transformed pearlite above the drawing strain of 0.46. The pre-cold-drawn samples isothermally transformed back to pearlite after austenitization and show lower hardness than the undeformed ones subjected to the same heat treatment despite having lower mean spacing. The mean S decreases with an increase in the austenitization temperature of the near eutectoid steel with a fully pearlitic microstructure, which increases hardness. However, no significant change was observed in mean S value and hardness for the highest degree of pre-cold-drawn isothermally transformed pearlite with increased austenitization temperature.