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<p>Ti-6Al-4V titanium alloy is a crucial structural material in various industries due to its excellent specific strength, corrosion resistance, and high-temperature stability. However, welding processes can create weak regions in the joints. This study examines the laser surface remelting (LSR) effects on argon arc weld metal using XRD, TEM, hardness, tensile, and dynamic compression testing. Results show LSR significantly refines weld metal grains and transforms residual <i>β</i> phase into acicular <i>α</i>′ martensite. Surface hardness increased from 350 to 400&#xa0;HV<sub>0.1</sub>. Compared to as-welded specimens, LSR enhanced yield strength and ultimate tensile strength by ~ 13% and ~ 12%, respectively. Ultimate compressive strength rose from 1025 to 1234&#xa0;MPa, while impact energy absorption increased from 106.1 to 138.5&#xa0;MJ/m<sup>3</sup>. Grain refinement along with the formation of <i>α</i>′-Ti martensite containing nano-twin structures is identified as the key strengthening mechanism. These findings indicate that LSR is an effective method for improving the performance of Ti-6Al-4V weld metal, offering valuable insights for industrial applications.</p>

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Microstructure and Mechanical Properties of Ti-6Al-4V Titanium Alloy Weld Metal Improved by Laser Surface Remelting

  • 期刊论文

  • 发表日期：

    2026年3月28日

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  • Jingyuan Tan,
  • Qi Wu,
  • Xiaoyang Huang,
  • Bingfeng Wang

摘要

Ti-6Al-4V titanium alloy is a crucial structural material in various industries due to its excellent specific strength, corrosion resistance, and high-temperature stability. However, welding processes can create weak regions in the joints. This study examines the laser surface remelting (LSR) effects on argon arc weld metal using XRD, TEM, hardness, tensile, and dynamic compression testing. Results show LSR significantly refines weld metal grains and transforms residual β phase into acicular α′ martensite. Surface hardness increased from 350 to 400 HV0.1. Compared to as-welded specimens, LSR enhanced yield strength and ultimate tensile strength by ~ 13% and ~ 12%, respectively. Ultimate compressive strength rose from 1025 to 1234 MPa, while impact energy absorption increased from 106.1 to 138.5 MJ/m3. Grain refinement along with the formation of α′-Ti martensite containing nano-twin structures is identified as the key strengthening mechanism. These findings indicate that LSR is an effective method for improving the performance of Ti-6Al-4V weld metal, offering valuable insights for industrial applications.