Effect of ultrasonic peening on fatigue performance of aluminum alloy FSW joints with root defects

ZHAN Rui; WANG Dongpo; DENG Caiyan; CUI Lei; GUAN Wei; LIANG Hang

doi:10.12073/j.hjxb.20201220001

TRANSACTIONS OF THE CHINA WELDING INSTITUTION > 2021 > 42(6): 7-12. > DOI: 10.12073/j.hjxb.20201220001

ZHAN Rui, WANG Dongpo, DENG Caiyan, CUI Lei, GUAN Wei, LIANG Hang. Effect of ultrasonic peening on fatigue performance of aluminum alloy FSW joints with root defects[J]. TRANSACTIONS OF THE CHINA WELDING INSTITUTION, 2021, 42(6): 7-12. DOI: 10.12073/j.hjxb.20201220001

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Effect of ultrasonic peening on fatigue performance of aluminum alloy FSW joints with root defects

ZHAN Rui^1,,
WANG Dongpo^{1, 2, ,},
DENG Caiyan^{1, 2},
CUI Lei^{1, 2},
GUAN Wei¹,
LIANG Hang¹

1.
Tianjin University, Tianjin, 300072, China
2.
Tianjin Key Laboratory of Advanced Joining Technology, Tianjin, 300072, China

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Received Date: December 19, 2020
Available Online: August 16, 2021

Graphical Abstract

Abstract

Abstract

Four-point bending fatigue tests were carried out to investigate the effects of ultrasonic impact treatment (UIT), ultrasonic peening (UP) and UIT + UP on the fatigue properties of aluminum alloy FSW joints with root “kissing bonding” defects, and the mechanism of the fatigue performance improvement was explored by analyzing the defect morphologies, microhardness values and residual stress distributions of the samples before and after treatments. Compared with the result that the fatigue strength of FSW joints treated by ultrasonic impact treatment at the root is improved only under 2 × 10⁶ cycles, the results show that UP and UIT + UP can significantly improve the high-cycle fatigue performance, and the fatigue strength is increased by 13% and 40% respectively, corresponding to 2 × 10⁶ cycles. UIT combined with UP cannot only form the compact work hardening layer at the root defects of the FSW joint, increase the microhardness, but also introduce the wider compressive residual stress region near the weld root by UP, eliminate the fold defects probably caused by UIT, significantly improving the fatigue performance.
- ultrasonic impact treatment,
- FSW,
- root kissing bonding defect,
- fatigue performance,
- residual stress

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References

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