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<p>TC4ELI titanium alloy has the characteristics of high strength, good toughness, and excellent corrosion resistance and is widely used in aerospace and marine vessels. This article explores the metal inert gas welding of TC4ELI titanium alloy plates with a thickness of 12.5&#xa0;mm. After welding, titanium alloys will generate significant residual stresses and coarse microstructures. To solve such problems, ultrasonic impact is used to regulate the microstructure, residual stress, and mechanical properties of welded joints. The microstructure evolution and fracture mechanism of the welded joint were analyzed by OM, SEM, XRD, EDS, and EBSD. The residual stress distribution of the welded joint was tested using blind-hole method. The mechanical properties of the welded joint were analyzed through tensile, impact, and microhardness tests. The mechanism of UIT on the microstructure evolution and residual stress of welded joints was elucidated. The results showed that UIT increased the maximum surface microhardness at the center of the weld by 9.5%, the impact toughness by 17%, and the heat-affected zone by 23%. However, its impact on tensile strength can be ignored, with only a 1% increase. Microstructure analysis shows that high-frequency vibration energy induces dislocation accumulation and macroscopic twinning, leading to dislocation entanglement and subsequent formation of dislocation cells and walls. Eventually, these subgrain boundaries evolved into fine grain boundaries.</p>

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Effects of Ultrasonic Impact Treatment on Microstructural Evolution and Mechanical Properties of TC4ELI Titanium Alloy MIG-Welded Joints

  • 期刊论文

  • 发表日期：

    2026年1月26日

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  • Guangfu Wu,
  • Xuetian Ding,
  • Deyang Zhang,
  • Jun Wang,
  • Juan Fu,
  • Yong Zhao,
  • Feiyun Wang

摘要

TC4ELI titanium alloy has the characteristics of high strength, good toughness, and excellent corrosion resistance and is widely used in aerospace and marine vessels. This article explores the metal inert gas welding of TC4ELI titanium alloy plates with a thickness of 12.5 mm. After welding, titanium alloys will generate significant residual stresses and coarse microstructures. To solve such problems, ultrasonic impact is used to regulate the microstructure, residual stress, and mechanical properties of welded joints. The microstructure evolution and fracture mechanism of the welded joint were analyzed by OM, SEM, XRD, EDS, and EBSD. The residual stress distribution of the welded joint was tested using blind-hole method. The mechanical properties of the welded joint were analyzed through tensile, impact, and microhardness tests. The mechanism of UIT on the microstructure evolution and residual stress of welded joints was elucidated. The results showed that UIT increased the maximum surface microhardness at the center of the weld by 9.5%, the impact toughness by 17%, and the heat-affected zone by 23%. However, its impact on tensile strength can be ignored, with only a 1% increase. Microstructure analysis shows that high-frequency vibration energy induces dislocation accumulation and macroscopic twinning, leading to dislocation entanglement and subsequent formation of dislocation cells and walls. Eventually, these subgrain boundaries evolved into fine grain boundaries.