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<p>In this study, a powder pool coupled activating TIG welding (PPCA-TIG) technique was employed to fabricate TiN/TiB-reinforced cladding layers on the Ti-6Al-4V surface. The BN addition amounts were varied (0, 3, 6, and 9&#xa0;g/min) to regulate microstructure, friction, wear resistance, and corrosion behavior. Results indicate that increasing BN causes dispersed TiN particles and acicular TiB particles to precipitate gradually in the cladding layer. This significantly refines and strengthens the phase structure. Regarding tribological properties, the acicular morphology of TiB and the high hardness of TiN significantly enhance wear resistance. With a BN addition of 9&#xa0;g/min, the sample exhibits markedly lower friction-and-wear weight loss than the BN-free sample. For corrosion resistance, a BN addition of 6&#xa0;g/min achieves optimal passivation film integrity, with minimum corrosion current density and maximum polarization resistance. When BN reaches 9&#xa0;g/min, passivation film integrity decreases, and localized corrosion susceptibility increases. This degrades corrosion resistance due to continuous TiB distribution at grain boundaries and partial surface exposure. This study demonstrates that BN addition regulates both the friction and wear, as well as the corrosion resistance, of the TC4 alloy. Optimal corrosion resistance occurs at 6&#xa0;g/min, while friction and wear perform best at 9&#xa0;g/min. The second-phase type primarily determines the performance of the Ti-6Al-4V cladding layer.</p>

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Effect of BN Addition on Microstructure and Properties of Ti-6Al-4V Arc Cladding Layer

  • 期刊论文

  • 发表日期：

    2026年1月26日

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  • Hewen Gao,
  • Zhenggang He,
  • Jiankang Huang,
  • Yong Huang,
  • Chenghao Xu,
  • Xinyue Wang,
  • Chen Dong

摘要

In this study, a powder pool coupled activating TIG welding (PPCA-TIG) technique was employed to fabricate TiN/TiB-reinforced cladding layers on the Ti-6Al-4V surface. The BN addition amounts were varied (0, 3, 6, and 9 g/min) to regulate microstructure, friction, wear resistance, and corrosion behavior. Results indicate that increasing BN causes dispersed TiN particles and acicular TiB particles to precipitate gradually in the cladding layer. This significantly refines and strengthens the phase structure. Regarding tribological properties, the acicular morphology of TiB and the high hardness of TiN significantly enhance wear resistance. With a BN addition of 9 g/min, the sample exhibits markedly lower friction-and-wear weight loss than the BN-free sample. For corrosion resistance, a BN addition of 6 g/min achieves optimal passivation film integrity, with minimum corrosion current density and maximum polarization resistance. When BN reaches 9 g/min, passivation film integrity decreases, and localized corrosion susceptibility increases. This degrades corrosion resistance due to continuous TiB distribution at grain boundaries and partial surface exposure. This study demonstrates that BN addition regulates both the friction and wear, as well as the corrosion resistance, of the TC4 alloy. Optimal corrosion resistance occurs at 6 g/min, while friction and wear perform best at 9 g/min. The second-phase type primarily determines the performance of the Ti-6Al-4V cladding layer.