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<p>This study established a fluid-solid coupling model involving the melt pool and rolls and systematically investigated the asymmetric heat transfer characteristics of the TSTRC process. The results indicate that the geometric asymmetry leads to a significantly worse cooling efficiency of the upper roll compared to the lower roll. When the cooling water velocity of the lower roll is set at 0.5&#xa0;m/s, increasing the cooling water velocity of the upper roll to 1.55&#xa0;m/s for steel rolls and 1.26&#xa0;m/s for Cu rolls can achieve a balanced cooling capacity, with the average roll surface temperatures being 431&#xa0;°C and 262&#xa0;°C, respectively. When the roll speed increases from 20 to 40&#xa0;m/min, increasing the cooling water velocity of the upper roll to 1.81 and 1.42&#xa0;m/s, respectively, can maintain a balanced cooling capacity with the lower roll’s velocity of 0.5&#xa0;m/s, with the roll surface temperatures being 402&#xa0;°C and 453&#xa0;°C, respectively. Microscopic analysis reveals that the grain size difference between the upper and lower roll sides reaches 70.6&#xa0;<i>μ</i>m before cooling balance is achieved, and a cast strip with uniformly distributed grains in the thickness direction is obtained after the cooling balance is established.</p>

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Study on Asymmetric Heat Transfer in the Top Side-Pouring Twin-Roll Casting Process

  • 期刊论文

  • 发表日期：

    2025年7月28日

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  • Wenhao Fan,
  • Cheng Zhou,
  • Tianliang Jiang,
  • Langkazhimei Songxi

摘要

This study established a fluid-solid coupling model involving the melt pool and rolls and systematically investigated the asymmetric heat transfer characteristics of the TSTRC process. The results indicate that the geometric asymmetry leads to a significantly worse cooling efficiency of the upper roll compared to the lower roll. When the cooling water velocity of the lower roll is set at 0.5 m/s, increasing the cooling water velocity of the upper roll to 1.55 m/s for steel rolls and 1.26 m/s for Cu rolls can achieve a balanced cooling capacity, with the average roll surface temperatures being 431 °C and 262 °C, respectively. When the roll speed increases from 20 to 40 m/min, increasing the cooling water velocity of the upper roll to 1.81 and 1.42 m/s, respectively, can maintain a balanced cooling capacity with the lower roll’s velocity of 0.5 m/s, with the roll surface temperatures being 402 °C and 453 °C, respectively. Microscopic analysis reveals that the grain size difference between the upper and lower roll sides reaches 70.6 μm before cooling balance is achieved, and a cast strip with uniformly distributed grains in the thickness direction is obtained after the cooling balance is established.