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Effects of laser shock peening on fatigue crack growth rate and fracture properties of AA2524 aluminum alloy

激光喷丸对AA2524铝合金疲劳和断裂性能的影响

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Abstract

In order to prolong the service life of aircraft skin made from AA2524, the effects of laser shock peening (LSP) on fatigue crack growth (FCG) rate and fracture toughness (Kc) of AA2524 were investigated. Multiple LSP treatment was performed on compact tension (CT) specimen from single side and double sides. The surface integrity was measured with Vickers hardness tester, X-ray diffractometer and confocal laser scanning microscope, respectively. FCG rate test and fracture toughness test under plane stress were carried out after LSP treatment. The microstructure features of cross-sections were observed with scanning electron microscope. The results showed that the micro-hardness and residual stress of CT specimens were increased dramatically after LSP treatment. Compared to the base metal (BM), the fatigue life was prolonged by 2.4 times and fracture toughness was increased by 22% after multiple LSP.

摘要

为延长机身蒙皮材料服役寿命对AA2524铝合金进行激光喷丸处理, 研究激光喷丸对AA2524铝合金疲劳和断裂性能的影响. 对紧凑拉伸(CT)试样经不同的喷丸次数和单面/双面激光喷丸后采用显微硬度计、 X射线残余应力仪和超景深显微镜进行表面完整性测量, 激光喷丸后开展疲劳裂纹扩展试验(FCG)和断裂韧性实验(Kc), 采用扫描电镜对断口微观组织进行观测. 结果表明: 经激光喷丸处理后, CT试样的显微硬度和残余应力均显著提高; 与母材(BM)相比, 单面激光喷丸3次后试样疲劳寿命延长了2.4倍, 断裂韧性提高了22%.

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Authors and Affiliations

  1. School of Electrical and Mechanical Engineering, Central South University, Changsha, 410083, China

    Song-bai Li  (李松柏), Xiang Li  (李湘), Wei Liang  (梁伟), Yi-lun Liu  (刘义伦) & Hong-zhi Yan  (严宏志)

  2. School of Mechatronics Engineering, Changsha University, Changsha, 410022, China

    Chi Liu  (刘驰)

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  1. Song-bai Li  (李松柏)
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  2. Xiang Li  (李湘)
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  3. Wei Liang  (梁伟)
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  4. Yi-lun Liu  (刘义伦)
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  5. Hong-zhi Yan  (严宏志)
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  6. Chi Liu  (刘驰)
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Contributions

The overarching research goals were developed by LI Song-bai and LIU Yi-lun. The initial draft of the manuscript was written by LI Xiang. LI Xiang and LIANG Wei measured the experiment data and analyzed the measured data. YAN Hong-zhi and LIU Chi provided the support of finance. LI Song-bai and LI Xiang replied to reviewer’s comments and revised the final version.

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Correspondence to Song-bai Li  (李松柏).

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All the authors declare that they have no conflict of interest.

Additional information

Foundation item: Project(52075552) supported by the National Natural Science Foundation of China; Project(kq2007085) supported by Changsha Municipal Natural Science Foundation, China

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Li, Sb., Li, X., Liang, W. et al. Effects of laser shock peening on fatigue crack growth rate and fracture properties of AA2524 aluminum alloy. J. Cent. South Univ. 29, 848–859 (2022). https://doi.org/10.1007/s11771-022-4966-0

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  • DOI: https://doi.org/10.1007/s11771-022-4966-0

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