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<p>The hot compression experiments were performed to thoroughly explore the effect of the cooling rate on the microstructural characteristics and mechanical properties of hypereutectoid pearlite steel. The results showed that the lamellar spacing of pearlite was refined by 15% and the pearlite colony and nodule sizes also became finer, which was attributed to the increasing of the cooling rate. As a result, the yield strength of the experimental steel was increased from 713 to 751&#xa0;MPa since the cooling rate enhanced from 5 to 20&#xa0;°C/s. Moreover, the strengthening mechanisms subjected with different cooling rate were established, with the consist of grain refining, dislocation, solid solution and precipitation strengthening contributions. The grain refining strengthening played a main role in hypereutectoid pearlite steels, and it contributed about 75% strength. This study provided a theoretical reference for cooling process in Stelmor line.</p>

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Effects of Cooling Rate in Stelmor Line on Microstructure and Mechanical Performance of Hypereutectoid Wire Rods

  • 期刊论文

  • 发表日期：

    2026年3月11日

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  • Zixuan Zhu,
  • Jincheng Li,
  • Chaolei Zhang,
  • Xiaokun Pan,
  • Shuize Wang,
  • Guilin Wu,
  • Junheng Gao,
  • Honghui Wu,
  • Haitao Zhao,
  • Xinping Mao

摘要

The hot compression experiments were performed to thoroughly explore the effect of the cooling rate on the microstructural characteristics and mechanical properties of hypereutectoid pearlite steel. The results showed that the lamellar spacing of pearlite was refined by 15% and the pearlite colony and nodule sizes also became finer, which was attributed to the increasing of the cooling rate. As a result, the yield strength of the experimental steel was increased from 713 to 751 MPa since the cooling rate enhanced from 5 to 20 °C/s. Moreover, the strengthening mechanisms subjected with different cooling rate were established, with the consist of grain refining, dislocation, solid solution and precipitation strengthening contributions. The grain refining strengthening played a main role in hypereutectoid pearlite steels, and it contributed about 75% strength. This study provided a theoretical reference for cooling process in Stelmor line.