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The aerospace industry finds Ti-6Al-4V to be a suitable material due to its higher specific strength. Nevertheless, the limited mechanical and surface properties restrict its potential use in crucial components. The objective of the present investigation was to enhance the microstructural and mechanical characteristics of Ti-6Al-4V, through the application of a thin metal matrix composite (MMC) coating. The coating was fabricated using the laser cladding technique, with Ti as the matrix and boron carbide (B4C) as the reinforcement material. The weight percentage of B4C was varied to investigate its impact on the MMC coating. The dissociation of B4C and subsequent synthesis of titanium carbide (TiC) occurred due to the observed affinity between titanium and carbon when exposed to a high-energy laser beam. In order to reduce the dissociation of B4C and facilitate the formation of in situ TiC, carbon nanotubes (CNTs) were included into the composite powder layer. The Raman spectroscopy revealed a rise in the number of defects within carbon nanotubes (CNTs) subsequent to deposition. The increase in defects strongly suggested the existence of unbound carbon within the molten pool, which subsequently reacted with titanium (Ti) to generate TiC. The microstructural and microhardness findings revealed the presence of in situ-generated TiC and intact B4C within the CNT-included clad layer. Furthermore, it was observed that the hardness of the coating increased as a result of CNT addition. Phase analysis and elemental mapping were conducted to get insight into the reaction mechanism of the cladding zone.

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Effect of Addition of CNT in Mitigating Dissociation of B4C and In Situ Formation of TiC on Ti64 Substrate During Laser Cladding Process to Achieve Hard Condensed Coating

  • 会议论文

  • 发表日期：

    2026年

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  • Mohammad Shahid Raza,
  • Prasenjit Patra,
  • Partha Saha

摘要

The aerospace industry finds Ti-6Al-4V to be a suitable material due to its higher specific strength. Nevertheless, the limited mechanical and surface properties restrict its potential use in crucial components. The objective of the present investigation was to enhance the microstructural and mechanical characteristics of Ti-6Al-4V, through the application of a thin metal matrix composite (MMC) coating. The coating was fabricated using the laser cladding technique, with Ti as the matrix and boron carbide (B4C) as the reinforcement material. The weight percentage of B4C was varied to investigate its impact on the MMC coating. The dissociation of B4C and subsequent synthesis of titanium carbide (TiC) occurred due to the observed affinity between titanium and carbon when exposed to a high-energy laser beam. In order to reduce the dissociation of B4C and facilitate the formation of in situ TiC, carbon nanotubes (CNTs) were included into the composite powder layer. The Raman spectroscopy revealed a rise in the number of defects within carbon nanotubes (CNTs) subsequent to deposition. The increase in defects strongly suggested the existence of unbound carbon within the molten pool, which subsequently reacted with titanium (Ti) to generate TiC. The microstructural and microhardness findings revealed the presence of in situ-generated TiC and intact B4C within the CNT-included clad layer. Furthermore, it was observed that the hardness of the coating increased as a result of CNT addition. Phase analysis and elemental mapping were conducted to get insight into the reaction mechanism of the cladding zone.