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<p>In this work, a multi-scale numerical model combining macro-scale 3D heat transfer and micro-scale solute microsegregation and TiN precipitation was developed to predict the precipitation behavior of TiN in a continuously cast Ti-alloyed steel slab. A statistical analysis was conducted to determine the number density distribution and the size distribution in the cross-section of the slab. The comparison between the simulation results and the experimental results validates that the model is sufficiently accurate to predict the size distribution of the TiN precipitation in the continuously cast slab. Meanwhile, the results show that the microsegregation is the primary impetus for the TiN precipitation, and the relatively low concentration of N is the restrictive factor for the thermodynamics and kinetics of the TiN precipitation. On the centerline of the cross-section, from 0 to 98.0 mm below the broad surface, the average size of the TiN precipitation gradually increases with the increasing depth, and the predicted maximum average size of the TiN precipitation is 4.57 <i>μ</i>m at 98.0 mm. When it comes to 98.0 to 115.0 mm, the average size of the TiN precipitation gradually decreases with the increasing depth, and the predicted average size of the TiN precipitation is 2.86 <i>μ</i>m at the core of the studied slab. Further numerical analysis indicates that the coarsening time, which is directly affected by the dynamic cooling rate during the TiN precipitation process, is one of the key factors to determine the TiN size distribution in the continuously cast slab of the Ti-alloyed steel.</p>

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Investigation on TiN Precipitation in Continuously Cast Slab of Ti-Alloyed Steel Via Multi-scale Simulation and Experimental Statistical Analysis

  • 期刊论文

  • 发表日期：

    2025年5月29日

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  • Haoyu Lu,
  • Sen Luo,
  • Guorong Wu,
  • Xin Xie,
  • Xiaotao Ma,
  • Yinchang Jiang,
  • Weiling Wang,
  • Miaoyong Zhu

摘要

In this work, a multi-scale numerical model combining macro-scale 3D heat transfer and micro-scale solute microsegregation and TiN precipitation was developed to predict the precipitation behavior of TiN in a continuously cast Ti-alloyed steel slab. A statistical analysis was conducted to determine the number density distribution and the size distribution in the cross-section of the slab. The comparison between the simulation results and the experimental results validates that the model is sufficiently accurate to predict the size distribution of the TiN precipitation in the continuously cast slab. Meanwhile, the results show that the microsegregation is the primary impetus for the TiN precipitation, and the relatively low concentration of N is the restrictive factor for the thermodynamics and kinetics of the TiN precipitation. On the centerline of the cross-section, from 0 to 98.0 mm below the broad surface, the average size of the TiN precipitation gradually increases with the increasing depth, and the predicted maximum average size of the TiN precipitation is 4.57 μm at 98.0 mm. When it comes to 98.0 to 115.0 mm, the average size of the TiN precipitation gradually decreases with the increasing depth, and the predicted average size of the TiN precipitation is 2.86 μm at the core of the studied slab. Further numerical analysis indicates that the coarsening time, which is directly affected by the dynamic cooling rate during the TiN precipitation process, is one of the key factors to determine the TiN size distribution in the continuously cast slab of the Ti-alloyed steel.