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<p>To reveal the influence mechanism of Nb/Ti microalloying on the mechanical property of ferritic stainless steel, the grain size, phase composition, microhardness, mechanical properties and fracture morphology are characterized and analyzed for ferritic stainless steel with single addition of Ti stabilizing element and composite addition of Nb and Ti stabilizing elements. The influence mechanism of Ti and Nb stabilizing elements is elucidated on microstructure and mechanical properties of ferritic stainless steel. Results indicate that the grains are bigger (20–60&#xa0;µm) for ferritic stainless steel containing 0.09 wt.% Ti (F-Ti-ss). The average grain size is about 43.9&#xa0;µm. Meanwhile, there are many granular TiN precipitates with big size. For ferritic stainless steel with Nb and Ti stabilizing elements (F-Nb-Ti-ss), the grains are small (8–22&#xa0;µm), and average grain size is about 17.3&#xa0;µm. There are a few granular TiN precipitates with small size. Furthermore, many nanoscale (Fe, Cr, Nb)C phases precipitate at grain boundary, which plays a role in refining grain size. Compared with mechanical properties of F-Ti-ss (506&#xa0;MPa and 28.2%), both the ultimate tensile strength and elongation are improved for F-Nb-Ti-ss (573&#xa0;MPa and 30.5%). The ultimate tensile strength is increased by 13.2%. The main reason is that grains are obviously refined and a large number of nanoscale phases precipitate at grain boundary for F-Nb-Ti-ss. Therefore, strengthening effect is obvious and grain deformation is more uniform during tensile test.</p>

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Precipitation behavior of TiN and mechanical properties of ferritic stainless steel under coupling effect of Nb and Ti elements

  • 期刊论文

  • 发表日期：

    2026年2月9日

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  • Yang-Li Liu,
  • Yu Zhang,
  • Hao Fu,
  • Shuo Dang,
  • Zhu Cao,
  • Muhammad-Abubaker Khan,
  • Jing-Yuan Li

摘要

To reveal the influence mechanism of Nb/Ti microalloying on the mechanical property of ferritic stainless steel, the grain size, phase composition, microhardness, mechanical properties and fracture morphology are characterized and analyzed for ferritic stainless steel with single addition of Ti stabilizing element and composite addition of Nb and Ti stabilizing elements. The influence mechanism of Ti and Nb stabilizing elements is elucidated on microstructure and mechanical properties of ferritic stainless steel. Results indicate that the grains are bigger (20–60 µm) for ferritic stainless steel containing 0.09 wt.% Ti (F-Ti-ss). The average grain size is about 43.9 µm. Meanwhile, there are many granular TiN precipitates with big size. For ferritic stainless steel with Nb and Ti stabilizing elements (F-Nb-Ti-ss), the grains are small (8–22 µm), and average grain size is about 17.3 µm. There are a few granular TiN precipitates with small size. Furthermore, many nanoscale (Fe, Cr, Nb)C phases precipitate at grain boundary, which plays a role in refining grain size. Compared with mechanical properties of F-Ti-ss (506 MPa and 28.2%), both the ultimate tensile strength and elongation are improved for F-Nb-Ti-ss (573 MPa and 30.5%). The ultimate tensile strength is increased by 13.2%. The main reason is that grains are obviously refined and a large number of nanoscale phases precipitate at grain boundary for F-Nb-Ti-ss. Therefore, strengthening effect is obvious and grain deformation is more uniform during tensile test.