Effect of ultrasonic rolling on the fatigue performance of laser-welded TC4 titanium alloy joints

IF 2.2 3区工程技术 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY International Journal of Fracture Pub Date : 2024-04-29 DOI:10.1007/s10704-024-00783-6

Cong Jiahui, Gao Jiayuan, Zhou Song, Zhang Zhichao, Wang Jiahao, Wang Naijing

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Abstract

To improve the fatigue performance of laser-welded TC4 titanium alloy joints, ultrasonic rolling processing (USRP) is employed herein. Multiple passes of USRP (viz., one, three, and five) are conducted using an ultrasonic rolling device. Results reveal that USRP considerably improves the fatigue limit and life of the welded joints. At room temperature, the fatigue strength of the weldment increases by 2.04–4.58% and the corrosion fatigue life increases by 1.72–2.88 times. In addition, to reveal its strengthening mechanism, the effects of USRP on the surface morphology, microstructure, surface residual stress, and microhardness of the laser-welded TC4 titanium alloy joints are investigated. USRP leads to a shift in the crack initiation point to the subsurface and formation of a hardened layer with high residual stress on the surface via the application of considerable static pressure input and multiple passes. Consequently, fatigue striations become narrower and denser. Compared to the traditional weld surface treatment, USRP substantially improves the surface quality and fatigue performance of laser-welded TC4 titanium alloy joints.

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超声波滚压对激光焊接 TC4 钛合金接头疲劳性能的影响

为了提高激光焊接 TC4 钛合金接头的疲劳性能，本文采用了超声波滚压处理（USRP）。使用超声波滚压装置进行了多次 USRP（即一次、三次和五次）。结果表明，超声波滚压处理大大提高了焊接接头的疲劳极限和寿命。在室温下，焊接件的疲劳强度提高了 2.04-4.58%，腐蚀疲劳寿命提高了 1.72-2.88 倍。此外，为了揭示其强化机制，研究了 USRP 对激光焊接 TC4 钛合金接头的表面形态、微观结构、表面残余应力和显微硬度的影响。通过大量静压输入和多次焊接，USRP 导致裂纹起始点向次表面移动，并在表面形成具有高残余应力的硬化层。因此，疲劳条纹变得更窄、更密集。与传统的焊接表面处理相比，USRP 能显著改善激光焊接 TC4 钛合金接头的表面质量和疲劳性能。

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来源期刊

International Journal of Fracture 物理-材料科学：综合

CiteScore

4.80

自引率

8.00%

发文量

审稿时长

13.5 months

期刊介绍： The International Journal of Fracture is an outlet for original analytical, numerical and experimental contributions which provide improved understanding of the mechanisms of micro and macro fracture in all materials, and their engineering implications. The Journal is pleased to receive papers from engineers and scientists working in various aspects of fracture. Contributions emphasizing empirical correlations, unanalyzed experimental results or routine numerical computations, while representing important necessary aspects of certain fatigue, strength, and fracture analyses, will normally be discouraged; occasional review papers in these as well as other areas are welcomed. Innovative and in-depth engineering applications of fracture theory are also encouraged. In addition, the Journal welcomes, for rapid publication, Brief Notes in Fracture and Micromechanics which serve the Journal''s Objective. Brief Notes include: Brief presentation of a new idea, concept or method; new experimental observations or methods of significance; short notes of quality that do not amount to full length papers; discussion of previously published work in the Journal, and Brief Notes Errata.