Performance analysis on welded joints made of TC4/TA17 dissimilar titanium alloys

Wang, Fang; Sun, Zhongzhou; Liu, Zirui; Hai, Minna; Wu, Yu; Zhang, Jinfei; Luo, Ruilong

doi:10.1016/j.oceaneng.2024.116758

Cited by 4 publications

(1 citation statement)

References 15 publications

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“…Our team preliminarily analyzed the microstructure and properties of tungsten inert gas (TIG)-welded Ti-4Al-2V [22]. Wang et al investigated the performance of different forms of dissimilar Ti-4Al-2V/Ti-6Al-4V welded joints [23]. Moreover, the influence of the welded pores on the fatigue behavior of Ti-4Al-2V at different temperatures was investigated by Liu et al [24].…”

Section: Introductionmentioning

confidence: 99%

Microstructure, Variant Selection, and Mechanical Properties of Laser-Welded Ti-4Al-2V Joints

Zhu,

Lu,

Zhang

et al. 2024

Metals

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Laser welding of the near α-phase titanium alloy Ti-4Al-2V, used for complex components in the nuclear industry, has been rarely reported. In this study, butt weld joints made of Ti-4Al-2V alloy plates under different parameters, including the laser power, the welding speed, and the defocus distance, were manufactured and analyzed. The results showed that adjusting the combination of 4.2 kW of laser power, a 20 mm/s welding speed, and a −2 mm defocus distance could achieve a penetration depth exceeding 6 mm. Porosity defects were prone to forming in the middle and bottom parts of the fusion zone, due to rapid cooling. The microstructure of the fusion zone was mainly needle-like α martensite, which precipitated in the form of specific clusters. The interior of a cluster was composed of three types of variants with <11−20>/60° phase interfaces to achieve the lower boundary’s energy. Affected by the microstructure and welding defects, the strength of the weld joint was basically similar under different welding conditions, namely about 720 MPa, slightly higher than that of the base metal, while the rupture elongation at breaking decreased by more than 50%. The micro-Vickers hardness of the weld joints was about 50–60 HV higher than that of the base metal, while the impact toughness was about 40 KJ, almost half that of the base metal. This research lays a solid foundation for the engineering application of laser welding of Ti-4Al-2V alloys.

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Section: Introductionmentioning

confidence: 99%