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<p>Fast multiple rotation rolling (FMRR) technique was applied to create a nanostructure layer on the surface of steel 45. Then, the FMRR samples were plasma nitrided at a temperature as low as 480 °C with the duration of 4&#xa0;h, 6&#xa0;h, and 8&#xa0;h. The mechanical and corrosion behavior was also investigated. The deformation layer and the microstructure of the top surface layer of the FMRR samples and nitrided samples were characterized by optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and x-ray diffraction (XRD). The results indicated that FMRR can cause plastic deformation with the depth of approximately 100um in the top surface of steel 45. A nanostructured layer, with an average grain size of about 40&#xa0;nm, was obtained in the top surface layer. High-density dislocations, amorphous phase, and twins were observed in the top surface layer of FMRR samples. A bright compound layer, with the depth of about 4&#xa0;µm, 6&#xa0;µm, and 8&#xa0;µm, was observed in the top surface layer of FMRR samples after plasma nitriding which was composed of Fe<sub>3</sub>N, Fe<sub>4</sub>N, and Fe<sub>24</sub>N<sub>11</sub>. The microhardness and the corrosion resistance of the substrate were significantly improved.</p>

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Effect of Surface Nanocrystallization Induced by Fast Multiple Rotation Rolling on Nitriding for Steel 45 under Ultra-low Temperature

  • 期刊论文

  • 发表日期：

    2026年4月9日

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  • Xiao-jie Yang,
  • Qun-jie Xu,
  • Xing Wei,
  • Shuai Wang,
  • Na-na Liu,
  • Ting-lin Fu,
  • Xing-dong Yuan

摘要

Fast multiple rotation rolling (FMRR) technique was applied to create a nanostructure layer on the surface of steel 45. Then, the FMRR samples were plasma nitrided at a temperature as low as 480 °C with the duration of 4 h, 6 h, and 8 h. The mechanical and corrosion behavior was also investigated. The deformation layer and the microstructure of the top surface layer of the FMRR samples and nitrided samples were characterized by optical microscopy (OM), scanning electron microscopy (SEM), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HRTEM), and x-ray diffraction (XRD). The results indicated that FMRR can cause plastic deformation with the depth of approximately 100um in the top surface of steel 45. A nanostructured layer, with an average grain size of about 40 nm, was obtained in the top surface layer. High-density dislocations, amorphous phase, and twins were observed in the top surface layer of FMRR samples. A bright compound layer, with the depth of about 4 µm, 6 µm, and 8 µm, was observed in the top surface layer of FMRR samples after plasma nitriding which was composed of Fe3N, Fe4N, and Fe24N11. The microhardness and the corrosion resistance of the substrate were significantly improved.