Ultrasonic irradiation induced the microstructure refinement and texture evolution of Ti–6Al–4V TIG weld seam

ABSTRACT

A comparison of the U-TIG with the TIG showed that weld grain diameter obtained by U-TIG was refined. In the weld surface, the maximum grain size of U-TIG was decreased by 400 µm. In the weld cross-section, the maximum grain size of U-TIG (70∼80 µm) was decreased by more than three times. The texture intensity of the weld seam in the TIG was significantly greater than that of the weld seam in the U-TIG due to that the microstructure of the weld seam in the U-TIG was improved. In the U-TIG, the ultrasound cavitation and acoustic streaming were generated in the weld pool by the ultrasonic irradiation which was the main causes of the significant refinement of the weld grain and the reduction of texture intensity.

KEYWORDS:

• Ultrasonic
• tungsten-electrode inert gas welding
• Ti–6Al–4V
• weld seam
• grain refinement
• texture

Disclosure statement

No potential conflict of interest was reported by the authors.

ORCID

Xiaoyu Cai http://orcid.org/0000-0001-9532-6537

Additional information

Funding

The National Science Foundation of China [grant number 51675130] financially supports this study. This work was also supported by the Key Program of the National Natural Science Foundation of China [grant number 51435004].