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<p>Based on the classical nucleation and growth theory (CNGT), this study proposes a precipitation kinetic model capable of characterizing the precipitation kinetics of Ti(C,N) after high-temperature deformation. The model integrates experimental data on dislocation density variations under different deformation conditions to predict the size evolution of Ti(C,N) during cooling. Building on this, by combining principles of precipitate growth, coarsening kinetics, and the pinning effect, the model calculates the softening fraction trend of microalloyed steel, determining the temperature and deformation conditions under which Ti(C,N) inhibits softening during the reduction process. Finally, through double-pass compression experiments, TEM microstructure characterization, and statistical analysis, it is confirmed that the model's predictions of precipitate size evolution and softening fraction align well with experimental results.</p>

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Strain-Induced Precipitation and Softening Behavior of Ti-Microalloyed Steel Under Heavy Reduction at the Solidification End of Continuous Casting Slab

  • 期刊论文

  • 发表日期：

    2025年5月24日

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  • Shaoyuan Shi,
  • Cheng Ji,
  • Miaoyong Zhu

摘要

Based on the classical nucleation and growth theory (CNGT), this study proposes a precipitation kinetic model capable of characterizing the precipitation kinetics of Ti(C,N) after high-temperature deformation. The model integrates experimental data on dislocation density variations under different deformation conditions to predict the size evolution of Ti(C,N) during cooling. Building on this, by combining principles of precipitate growth, coarsening kinetics, and the pinning effect, the model calculates the softening fraction trend of microalloyed steel, determining the temperature and deformation conditions under which Ti(C,N) inhibits softening during the reduction process. Finally, through double-pass compression experiments, TEM microstructure characterization, and statistical analysis, it is confirmed that the model's predictions of precipitate size evolution and softening fraction align well with experimental results.