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Porosity, Element Loss, and Strength Model on Softening Behavior of Hybrid Laser Arc Welded Al-Zn-Mg-Cu Alloy with Synchrotron Radiation Analysis | |
Wu, S. C.; Yu, X.; Zuo, R. Z.; Zhang, W. H.; Xie, H. L.; Jiang, J. Z. | |
2013 | |
Source Publication | WELDING JOURNAL
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ISSN | 0043-2296 |
Volume | 92Issue:3Pages:64s-71s |
Abstract | The severe strength loss of hybrid welded Al-Zn-Mg-Cu alloy joints such as 7075-T6 has been characterized using high-resolution synchrotron radiation X-rays and theoretical modeling. To elucidate the physical causes of this static strength change, the distribution of strengthening elements such as Zn and Cu and the three-dimensional gas porosity were mapped. The interesting findings included the following: 1) Hybrid welds only reach approximately 53% of the ultimate tensile strength of the base phase, and the lowest strength is situated in the central fusion zone; 2) because of the excessive evaporation of elemental Zn and the significant inverse segregation of elemental Cu in cenral fusion welds, the major strengthening elements gather near the heat-affected zone; 3) the elastic modulus of hybrid welds is slightly larger than that of their base alloys, probably as a result of the inhomogeneity in their chemical composition, microstructure, geometry, and residual stress; 4) the pore size ranges from below 0.01 mu m to approximately 107 mu m, and it is modeled by the Schwartz-Saltykov method to reveal its damaging effects on the static strength; 5) a strength model of 7075-T6 welded butt joints is established to correlate with the elastic modulus, porosity, and heat inputs, and it coincides well with the computational and experimental results; and 6) in principle, the porosity has little influence on the static strength of hybrid welds, and the modified strengthening structure markedly dominates the overall mechanical properties. |
Indexed By | SCI |
Language | 英语 |
Funding Project | 应物所项目组 |
Document Type | 期刊论文 |
Identifier | http://ir.sinap.ac.cn/handle/331007/13857 |
Collection | 中科院上海应用物理研究所2011-2020年 |
Recommended Citation GB/T 7714 | Wu, S. C.,Yu, X.,Zuo, R. Z.,et al. Porosity, Element Loss, and Strength Model on Softening Behavior of Hybrid Laser Arc Welded Al-Zn-Mg-Cu Alloy with Synchrotron Radiation Analysis[J]. WELDING JOURNAL,2013,92(3):64s-71s. |
APA | Wu, S. C.,Yu, X.,Zuo, R. Z.,Zhang, W. H.,Xie, H. L.,&Jiang, J. Z..(2013).Porosity, Element Loss, and Strength Model on Softening Behavior of Hybrid Laser Arc Welded Al-Zn-Mg-Cu Alloy with Synchrotron Radiation Analysis.WELDING JOURNAL,92(3),64s-71s. |
MLA | Wu, S. C.,et al."Porosity, Element Loss, and Strength Model on Softening Behavior of Hybrid Laser Arc Welded Al-Zn-Mg-Cu Alloy with Synchrotron Radiation Analysis".WELDING JOURNAL 92.3(2013):64s-71s. |
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