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<p>A metallurgical model for austenite coarsening in the coarse-grained heat-affected zone (CGHAZ) containing titanium nitride (TiN) precipitation was studied. Unlike traditional methods estimating pinning capability based on the precipitation size after welding, a proposed dissolution and coarsening model was applied to study the changes in TiN precipitation size and the associated pinning forces. The transmission electron microscope was used to analyze the size distribution of TiN particles before and after the welding thermal cycle. The size distribution showed a log-normal distribution before the thermal cycle. The prediction of post-thermal cycle size distributions&#xa0;with the&#xa0;proposed model was in agreement with the experimental results. Considering the short holding time at high temperature during welding, the thermodynamic stability conditions required for limiting grain size model cannot be achieved. A simple kinetic model for the prediction of austenite grain size in CGHAZ was established. Finally, the predicted austenite grain sizes agree better with experimental results than the conventional approach.</p>

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Prediction model for austenite grain size in CGHAZ of TiN-containing steel: considering minimum pinning force and austenite coarsening dynamics

  • 期刊论文

  • 发表日期：

    2025年5月4日

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  • Jun-jie Hao,
  • Chao Wang,
  • Hua Duan,
  • Zhu Yan,
  • Guo Yuan,
  • Guo-dong Wang

摘要

A metallurgical model for austenite coarsening in the coarse-grained heat-affected zone (CGHAZ) containing titanium nitride (TiN) precipitation was studied. Unlike traditional methods estimating pinning capability based on the precipitation size after welding, a proposed dissolution and coarsening model was applied to study the changes in TiN precipitation size and the associated pinning forces. The transmission electron microscope was used to analyze the size distribution of TiN particles before and after the welding thermal cycle. The size distribution showed a log-normal distribution before the thermal cycle. The prediction of post-thermal cycle size distributions with the proposed model was in agreement with the experimental results. Considering the short holding time at high temperature during welding, the thermodynamic stability conditions required for limiting grain size model cannot be achieved. A simple kinetic model for the prediction of austenite grain size in CGHAZ was established. Finally, the predicted austenite grain sizes agree better with experimental results than the conventional approach.