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<p>Titanium alloys are promising materials for marine engineering equipment and infrastructures due to their low density, high strength and excellent corrosion resistance. However, stress corrosion has been regarded as one of the most significant threats for titanium alloys, which may lead to cracking and serious failure. Welding is the most important method for the fabrication and combination of large titanium alloy structures and components, and the stress corrosion susceptibility of the welded joint differs substantially from the base metals. This work investigated the stress corrosion behaviors of the gas tungsten arc welded (GTAW) joint of TC4 titanium alloy by comparing the electrochemical and microstructural characteristics and also the crack propagation behaviors of base metal (BM), heat-affected zone (HAZ) and weld metal (WM). The <i>K</i><sub><i>ISCC</i></sub> value followed the order WM &gt; HAZ &gt; BM. The corrosion resistance assessed via electrochemical impedance spectroscopy (EIS) was the highest at WM and lowest at BM, correlated well with the quality of the passive film assessed by Mott–Schottky measurements. The microstructure has been found to influence the crack propagation in the view of microstructural uniformity and texture strength. The typical equiaxed structure of BM favored the crack propagation, while the typical lamellar structure and the acicular martensite phases in WM inhibited crack propagation and caused deflection of the crack path.</p>

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Stress corrosion in the gas tungsten arc welded (GTAW) joint of TC4 titanium alloys in NaCl solution—in electrochemical and microstructural aspects

  • 期刊论文

  • 发表日期：

    2026年3月2日

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  • Xiangyu Tong,
  • Weichen Xu,
  • Youqiang Wang,
  • Xiutong Wang,
  • Wolfgang Sand,
  • Jizhou Duan

摘要

Titanium alloys are promising materials for marine engineering equipment and infrastructures due to their low density, high strength and excellent corrosion resistance. However, stress corrosion has been regarded as one of the most significant threats for titanium alloys, which may lead to cracking and serious failure. Welding is the most important method for the fabrication and combination of large titanium alloy structures and components, and the stress corrosion susceptibility of the welded joint differs substantially from the base metals. This work investigated the stress corrosion behaviors of the gas tungsten arc welded (GTAW) joint of TC4 titanium alloy by comparing the electrochemical and microstructural characteristics and also the crack propagation behaviors of base metal (BM), heat-affected zone (HAZ) and weld metal (WM). The KISCC value followed the order WM > HAZ > BM. The corrosion resistance assessed via electrochemical impedance spectroscopy (EIS) was the highest at WM and lowest at BM, correlated well with the quality of the passive film assessed by Mott–Schottky measurements. The microstructure has been found to influence the crack propagation in the view of microstructural uniformity and texture strength. The typical equiaxed structure of BM favored the crack propagation, while the typical lamellar structure and the acicular martensite phases in WM inhibited crack propagation and caused deflection of the crack path.