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<p>In this study, TA15 titanium alloy plates were welded through laser beam welding (LBW). The effects of welding parameters on the microstructure and mechanical properties of welding joints were studied. The experimental results showed that the microstructure distribution of the heat-affected zone (HAZ) was not uniform, which was divided into two parts: far from the fusion zone and near the fusion zone. The distribution of acicular α′ martensite in the fusion zone (FZ) is in the form of a net basket within the β columnar crystals. When the laser power was 4300 W, the tensile strength of the welding joint reached a maximum value of 980&#xa0;MPa, which was about 96.2% of the TA15 titanium alloy. The microhardness of FZ was the highest compared with base metal (BM) and HAZ. The orientation of α′ martensite in the HAZ in the XO direction was consistent with the {0001} crystallographic orientation. The crystal orientation angle was mainly concentrated at 60° and 90°.</p>

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Microstructure and Mechanical Properties of Laser Welding Joints of 5 mm-Thick TA15 Titanium Alloy Plates

  • 期刊论文

  • 发表日期：

    2025年9月24日

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  • Guowei Li,
  • Yinshuang Wang,
  • Yahong Liang,
  • Xinyu Liu,
  • Wencai Xu,
  • Dawei Yang

摘要

In this study, TA15 titanium alloy plates were welded through laser beam welding (LBW). The effects of welding parameters on the microstructure and mechanical properties of welding joints were studied. The experimental results showed that the microstructure distribution of the heat-affected zone (HAZ) was not uniform, which was divided into two parts: far from the fusion zone and near the fusion zone. The distribution of acicular α′ martensite in the fusion zone (FZ) is in the form of a net basket within the β columnar crystals. When the laser power was 4300 W, the tensile strength of the welding joint reached a maximum value of 980 MPa, which was about 96.2% of the TA15 titanium alloy. The microhardness of FZ was the highest compared with base metal (BM) and HAZ. The orientation of α′ martensite in the HAZ in the XO direction was consistent with the {0001} crystallographic orientation. The crystal orientation angle was mainly concentrated at 60° and 90°.