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<p>This work investigates acicular ferrite (AF) transformation through morphological evolution analysis, kinetic studies, and cooling rate effects using laser scanning confocal microscopy, thermal simulation, and electron backscattered diffraction experiments. The results demonstrate that AF transformation follows a continuous nucleation model and one-dimensional growth model, leading to the development of a new AF kinetic equation. The study quantitatively analyzes cooling rate effects (6.3–19.4 K/s) on the kinetic constant and qualitatively examines its impact on nucleation constant, nucleation number density, and overall AF growth rate. Key findings include: (i) kinetic constant shows quadratic dependence on cooling rate, (ii) nucleation constant and nucleation number density increase with cooling rate, and (iii) overall AF grain growth rate shows no pronounced dependence on cooling rate. These results confirm that higher cooling rates promote finer AF grain formation. Building on this kinetic understanding, the work predicts and verifies prior austenite grain size (PAGS) effect on AF transformation that decreasing PAGS is beneficial to obtain fine AF grains. The comprehensive findings significantly advance fundamental knowledge of AF transformation kinetics.</p>

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Effect of fast cooling rate on acicular ferrite kinetics in high-strength low-alloy steel

  • 期刊论文

  • 发表日期：

    2026年6月29日

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  • Chun-long Jiang,
  • Xuan-wei Lei,
  • Kai-ming Wu,
  • Chao-bin Lai

摘要

This work investigates acicular ferrite (AF) transformation through morphological evolution analysis, kinetic studies, and cooling rate effects using laser scanning confocal microscopy, thermal simulation, and electron backscattered diffraction experiments. The results demonstrate that AF transformation follows a continuous nucleation model and one-dimensional growth model, leading to the development of a new AF kinetic equation. The study quantitatively analyzes cooling rate effects (6.3–19.4 K/s) on the kinetic constant and qualitatively examines its impact on nucleation constant, nucleation number density, and overall AF growth rate. Key findings include: (i) kinetic constant shows quadratic dependence on cooling rate, (ii) nucleation constant and nucleation number density increase with cooling rate, and (iii) overall AF grain growth rate shows no pronounced dependence on cooling rate. These results confirm that higher cooling rates promote finer AF grain formation. Building on this kinetic understanding, the work predicts and verifies prior austenite grain size (PAGS) effect on AF transformation that decreasing PAGS is beneficial to obtain fine AF grains. The comprehensive findings significantly advance fundamental knowledge of AF transformation kinetics.