High-Frequency Ultrasonic Impact Treatment Effect on Fatigue Properties of TC4 Titanium Alloy Laser Wire Filling-Welded Joints
This study aimed to improve the fatigue properties of TC4 titanium alloy laser-filled wire welded joints. To this end, the highfrequency ultrasonic impact technology (UIT) was used to implement post-weld impact treatment on the welded part. Nondestructive testing of the phase composition, microstruc...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Polish Academy of Sciences
2025-06-01
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| Series: | Archives of Metallurgy and Materials |
| Subjects: | |
| Online Access: | https://journals.pan.pl/Content/135493/AMM-2025-2-03-Jialei%20Zhao.pdf |
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| Summary: | This study aimed to improve the fatigue properties of TC4 titanium alloy laser-filled wire welded joints. To this end, the highfrequency ultrasonic impact technology (UIT) was used to implement post-weld impact treatment on the welded part. Nondestructive testing of the phase composition, microstructure, microhardness, static and cyclic tensile properties, and fracture morphology before and after UIT were conducted and comparatively analyzed. The results show that the high-frequency UIT refines surface grains without affecting the weld phase composition, which is still dominated by the martensitic α' phase and does not form the ω phase. Due to plastic slip-induced strain-hardening, the microhardness of the weld surface layer is about 12% higher than before the UIT and about 40% higher than that of the base metal. Before UIT, long and thick cracks at static tensile fracture extend on the specimen surface; after UIT, the static tensile fracture surface is fine and smooth, and tiny cracks expand in the interior. The fatigue limit of the laser wire filling welding (LWFW) in the TC4 titanium alloy joint increased by about 29.4% after UIT. After high-frequency ultrasonic impact, cracks expand in the joint; the fatigue band spacing becomes smaller, and dimples are denser and deeper, while the fatigue limit load increases, effectively improving the fatigue resistance of the TC4 titanium alloy laser wire-filling welded joint. |
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| ISSN: | 2300-1909 |