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<p>This study investigates the effects of varying vanadium–nitrogen (V-N) content on precipitation behavior, microstructural evolution, and mechanical properties during the rolling process of the austenitic zone in hot-rolled high-strength steel. Results indicated that an appropriate V-N content promoted strain-induced precipitation of V(C,N), refined the prior austenite grain, and significantly enhanced strength. At lower V-N contents, although nucleation rates were higher and precipitation times shorter, the total precipitate volume remained insufficient, making grain refinement through recrystallization control challenging. Increasing nitrogen content facilitated V(C,N) precipitation at higher temperatures, forming dispersed particles predominantly ranging from 5 to 40&#xa0;nm in size. Analysis of precipitation kinetics further indicated that both increased deformation stored energy (DSE) and elevated nitrogen content effectively promoted V(C,N) nucleation and growth. This shifted both the precipitation–temperature–time (PTT) curve and the nucleation–rate–time (NrT) curve toward higher temperatures and shorter durations. This research provides a basis for optimizing the composition and processing of V-N microalloyed steels to achieve grain refinement strengthening and enhanced performance.</p>

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Microstructure and Second Phase Precipitation Behavior of V-N Microalloyed High-Strength Steel during Hot Rolling

  • 期刊论文

  • 发表日期：

    2026年5月29日

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  • Kangfeng Zhu,
  • Xuegang Xiong,
  • Xinjun Sun,
  • Caifu Yang

摘要

This study investigates the effects of varying vanadium–nitrogen (V-N) content on precipitation behavior, microstructural evolution, and mechanical properties during the rolling process of the austenitic zone in hot-rolled high-strength steel. Results indicated that an appropriate V-N content promoted strain-induced precipitation of V(C,N), refined the prior austenite grain, and significantly enhanced strength. At lower V-N contents, although nucleation rates were higher and precipitation times shorter, the total precipitate volume remained insufficient, making grain refinement through recrystallization control challenging. Increasing nitrogen content facilitated V(C,N) precipitation at higher temperatures, forming dispersed particles predominantly ranging from 5 to 40 nm in size. Analysis of precipitation kinetics further indicated that both increased deformation stored energy (DSE) and elevated nitrogen content effectively promoted V(C,N) nucleation and growth. This shifted both the precipitation–temperature–time (PTT) curve and the nucleation–rate–time (NrT) curve toward higher temperatures and shorter durations. This research provides a basis for optimizing the composition and processing of V-N microalloyed steels to achieve grain refinement strengthening and enhanced performance.