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<p>To address the issues of slow nitriding rate and thin nitrided layer associated with single ion nitriding, this study employed ultrasonic surface rolling processing (USRP) as a pretreatment for plasma nitriding of H13 steel. By combining techniques such as electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), X-ray diffraction (XRD), electron probe microanalysis (EPMA), and microhardness testing, the influence of USRP on the enhanced nitriding mechanism and strengthening effects of H13 steel was investigated. The results indicate that USRP treatment constructs a multidimensional crystal defect network primarily composed of dislocation lines and grain boundaries. This network promotes the adsorption and diffusion of nitrogen atoms. It also reduces the hindrance of vermicular microstructures to nitrogen diffusion. Compared with single nitriding, the nitrided layer thickness of the USRP + PN specimen increased from 131.92 to 161.98&#xa0;μm, representing a 22.8% improvement. The surface nitrogen concentration increased from 2.9 to 3.8 at.%, and the content of strengthening phases (<i>γ</i>′-Fe₄N and <i>ε</i>-Fe₂<sub>−</sub>₃N) was significantly enhanced. The surface microhardness of the USRP + PN specimen was 10.1% higher than that of the PN specimen, attributed to the synergistic effects of work hardening, nitride precipitation, and solid solution strengthening. This study provides theoretical support for the application of USRP pretreatment in enhancing plasma nitriding of H13 steel and for understanding the synergistic strengthening mechanisms involved.</p>

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Study on the enhanced nitriding mechanism of H13 steel facilitated by ultrasonic surface rolling pretreatment

  • 期刊论文

  • 发表日期：

    2026年3月27日

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  • Tong Chen,
  • Dianxiu Xia,
  • Shouren Wang,
  • Yanlan Sun,
  • Jian Zhang,
  • Peidun Chen,
  • Xintao Zhang,
  • Lin Cui,
  • Mingxin Yang

摘要

To address the issues of slow nitriding rate and thin nitrided layer associated with single ion nitriding, this study employed ultrasonic surface rolling processing (USRP) as a pretreatment for plasma nitriding of H13 steel. By combining techniques such as electron backscatter diffraction (EBSD), transmission electron microscopy (TEM), X-ray diffraction (XRD), electron probe microanalysis (EPMA), and microhardness testing, the influence of USRP on the enhanced nitriding mechanism and strengthening effects of H13 steel was investigated. The results indicate that USRP treatment constructs a multidimensional crystal defect network primarily composed of dislocation lines and grain boundaries. This network promotes the adsorption and diffusion of nitrogen atoms. It also reduces the hindrance of vermicular microstructures to nitrogen diffusion. Compared with single nitriding, the nitrided layer thickness of the USRP + PN specimen increased from 131.92 to 161.98 μm, representing a 22.8% improvement. The surface nitrogen concentration increased from 2.9 to 3.8 at.%, and the content of strengthening phases (γ′-Fe₄N and ε-Fe₂−₃N) was significantly enhanced. The surface microhardness of the USRP + PN specimen was 10.1% higher than that of the PN specimen, attributed to the synergistic effects of work hardening, nitride precipitation, and solid solution strengthening. This study provides theoretical support for the application of USRP pretreatment in enhancing plasma nitriding of H13 steel and for understanding the synergistic strengthening mechanisms involved.