Improvement in fatigue properties of 2024-T351 aluminum alloy subjected to cryogenic treatment and laser peening
Autor: | Feng Aixin, Sun Yunhui, Shu Huang, Jing Li, Sheng Jie, Meng Xiankai, Jianzhong Zhou, Suqiang Xu, Haifeng Zhang |
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Rok vydání: | 2018 |
Předmět: |
010302 applied physics
Materials science Scanning electron microscope Laser peening Alloy 02 engineering and technology Surfaces and Interfaces General Chemistry engineering.material 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences Indentation hardness Surfaces Coatings and Films Residual stress 0103 physical sciences Ultimate tensile strength Materials Chemistry engineering Cryogenic treatment Composite material 0210 nano-technology |
Zdroj: | Surface and Coatings Technology. 345:31-39 |
ISSN: | 0257-8972 |
DOI: | 10.1016/j.surfcoat.2018.03.088 |
Popis: | The aim of this study was to investigate the effects of Cryogenic Treatment (CT) and Laser Peening (LP) on the fatigue properties of 2024-T351 aluminum alloy. The measurements of tensile properties and microhardness were carried out, and the residual stress tests were also conducted through x-ray diffraction (XRD) technology. Examination of microstructure was executed by Scanning Electron Microscopy (SEM) and Transmission Electron Microscopy (TEM) observations. Fatigue tests were conducted and the fatigue fracture morphologies were also analyzed by SEM. Experimental results found that both CT and LP could enhance the fatigue properties of 2024-T351 aluminum alloy. The process of CT prior to LP could provide a higher fatigue life compared with single CT or LP process. After CT prior to LP, the fatigue life of the treated specimen was 28,077 cycles under gradient loading, which obtained an increase of 4640 cycles compared to the untreated specimen. Meanwhile, compared with single CT and LP, CT prior to LP could produce finer grains, more precipitated second phases, higher density dislocation and compressive residual stresses. Beneficial microstructure evolution and compressive residual stress induced by CT prior to LP were considered to be the main factors that contribute to the improvement of the fatigue properties. |
Databáze: | OpenAIRE |
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