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<p>A novel powder-feed underwater laser metal deposition (ULMD) technology was developed for the in situ repair of the damaged components in an underwater environment. In this research, the Ti6Al4V block was fabricated by the powder-feed ULMD process in an underwater environment. A developed drainage device was used to generate a local dry cavity to realize the interaction between the laser and materials. The morphology features, microstructure, and mechanical properties of the ULMD block sample were investigated. The results show that the ULMD-produced Ti6Al4V presents a continuous and uniform surface, and no pores or incomplete fusion defects are observed in the deposited parts. The acicular α′ martensite within the columnar prior-β grains is formed due to the rapid cooling rate caused by water and gas flow. The tensile test demonstrates the ULMD sample has a higher strength and lower elongation compared with in-air LMD or wrought material.</p>

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Microstructure and properties of powder-feed underwater laser metal deposition of Ti6Al4V titanium alloy

  • 期刊论文

  • 发表日期：

    2025年12月12日

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  • Jinchao Zhang,
  • Xiaofeng Wan,
  • Jiaqi Li,
  • Jincan Cui,
  • Boyong Su,
  • Qingqing Zhu,
  • Qingsong Ding,
  • Yuhang Sun

摘要

A novel powder-feed underwater laser metal deposition (ULMD) technology was developed for the in situ repair of the damaged components in an underwater environment. In this research, the Ti6Al4V block was fabricated by the powder-feed ULMD process in an underwater environment. A developed drainage device was used to generate a local dry cavity to realize the interaction between the laser and materials. The morphology features, microstructure, and mechanical properties of the ULMD block sample were investigated. The results show that the ULMD-produced Ti6Al4V presents a continuous and uniform surface, and no pores or incomplete fusion defects are observed in the deposited parts. The acicular α′ martensite within the columnar prior-β grains is formed due to the rapid cooling rate caused by water and gas flow. The tensile test demonstrates the ULMD sample has a higher strength and lower elongation compared with in-air LMD or wrought material.