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<p>To enhance the wear resistance and crack resistance of 20CrMnTi gear steel, this study employed atmospheric plasma spraying (APS) technology to prepare BN (5, 10, 15wt.%)-FeMoCrBSi-TiO<sub>2</sub> iron-based amorphous composite coatings. The microstructure, elemental distribution, and phase composition of the coatings were characterized using field emission scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and x-ray diffraction (XRD). Microhardness and nanoindentation hardness were measured using a micro-Vickers hardness tester and a nanoindenter, respectively. Crack propagation behavior in the substrate was simulated using the extended finite element method (XFEM) based on ABAQUS finite element software. Results indicate: The coating consists of Fe-Cr solid solution, BN phase, and amorphous phase; amorphous content significantly increases with BN content up to 15 wt.%; and the 10 wt.% BN coating exhibits the most pronounced grain refinement. Cross-sectional analysis revealed the lowest porosity in the 10 wt.% BN coating and the most uniform element distribution in the 15 wt.% BN coating. Microhardness increased linearly with BN content (reaching 688.4 HV in the 15 wt.% BN coating), attributed to BN’s dispersion strengthening and Cr-rich phase densification effects. XFEM simulations confirmed the coating’s ability to effectively deflect crack paths and inhibit crack propagation in the substrate. This study reveals the synergistic optimization mechanism of BN doping for wear resistance and crack resistance in iron-based amorphous coatings, providing theoretical support for surface strengthening of gear steels.</p>

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Study on the Properties of BN-Doped Iron-Based Amorphous Composite Coatings and Crack Propagation in the Matrix

  • 期刊论文

  • 发表日期：

    2026年3月31日

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  • Xinsheng Wang,
  • Daohuan Qi,
  • Lingang Wang,
  • Zhengji Cheng,
  • Yudong Zhong,
  • Yanpei Liu

摘要

To enhance the wear resistance and crack resistance of 20CrMnTi gear steel, this study employed atmospheric plasma spraying (APS) technology to prepare BN (5, 10, 15wt.%)-FeMoCrBSi-TiO2 iron-based amorphous composite coatings. The microstructure, elemental distribution, and phase composition of the coatings were characterized using field emission scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), and x-ray diffraction (XRD). Microhardness and nanoindentation hardness were measured using a micro-Vickers hardness tester and a nanoindenter, respectively. Crack propagation behavior in the substrate was simulated using the extended finite element method (XFEM) based on ABAQUS finite element software. Results indicate: The coating consists of Fe-Cr solid solution, BN phase, and amorphous phase; amorphous content significantly increases with BN content up to 15 wt.%; and the 10 wt.% BN coating exhibits the most pronounced grain refinement. Cross-sectional analysis revealed the lowest porosity in the 10 wt.% BN coating and the most uniform element distribution in the 15 wt.% BN coating. Microhardness increased linearly with BN content (reaching 688.4 HV in the 15 wt.% BN coating), attributed to BN’s dispersion strengthening and Cr-rich phase densification effects. XFEM simulations confirmed the coating’s ability to effectively deflect crack paths and inhibit crack propagation in the substrate. This study reveals the synergistic optimization mechanism of BN doping for wear resistance and crack resistance in iron-based amorphous coatings, providing theoretical support for surface strengthening of gear steels.