Scholarlink

<p>TiN inclusions precipitated during the solidification of Ti-microalloyed high-strength steels tend to grow to large sizes and are therefore difficult to dissolve during subsequent rolling and heat treatment. In this study, TiN precipitation and diffusion-controlled growth during solidification were quantitatively predicted using a numerical model coupling solute microsegregation with inclusion growth kinetics. Based on thermodynamic calculations using FactSage, the equilibrium partition coefficients of solute elements and the solubility product of TiN were calculated and incorporated into the model. The results demonstrate that the use of dynamic partition coefficients improves the accuracy of predicting solute enrichment in the interdendritic liquid during the late stage of solidification. Moreover, the model employing a thermodynamically optimized TiN solubility product provides more reliable predictions of TiN precipitation than traditional empirical approaches. Alloying elements exhibit distinct effects on TiN evolution: increasing Ti content mainly advances the onset of TiN precipitation but has a limited influence on the final inclusion size, whereas increasing N content significantly promotes TiN growth. The cooling rate is identified as the dominant kinetic factor controlling TiN size, with the maximum TiN size increasing from approximately 1 to 2 <i>μ</i>m to 13 to 17 <i>μ</i>m as the cooling rate decreases from 50 to 0.5&#xa0;°C&#xa0;s<sup>−1</sup>.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Modeling the Precipitation and Growth of TiN Inclusions During Solidification of Ti-Microalloyed High-Strength Steels

  • 期刊论文

  • 发表日期：

    2026年5月22日

查看全文
  • Haoyu Wang,
  • Pan Gao,
  • Wenjun Ma,
  • Mingyu Ma,
  • Lixia Hao,
  • Tao Li,
  • Min Tan

摘要

TiN inclusions precipitated during the solidification of Ti-microalloyed high-strength steels tend to grow to large sizes and are therefore difficult to dissolve during subsequent rolling and heat treatment. In this study, TiN precipitation and diffusion-controlled growth during solidification were quantitatively predicted using a numerical model coupling solute microsegregation with inclusion growth kinetics. Based on thermodynamic calculations using FactSage, the equilibrium partition coefficients of solute elements and the solubility product of TiN were calculated and incorporated into the model. The results demonstrate that the use of dynamic partition coefficients improves the accuracy of predicting solute enrichment in the interdendritic liquid during the late stage of solidification. Moreover, the model employing a thermodynamically optimized TiN solubility product provides more reliable predictions of TiN precipitation than traditional empirical approaches. Alloying elements exhibit distinct effects on TiN evolution: increasing Ti content mainly advances the onset of TiN precipitation but has a limited influence on the final inclusion size, whereas increasing N content significantly promotes TiN growth. The cooling rate is identified as the dominant kinetic factor controlling TiN size, with the maximum TiN size increasing from approximately 1 to 2 μm to 13 to 17 μm as the cooling rate decreases from 50 to 0.5 °C s−1.