期刊
INTERNATIONAL JOURNAL OF FATIGUE
卷 91, 期 -, 页码 1-10出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ijfatigue.2016.05.017
关键词
Fatigue crack propagation rate; Residual stress; Hybrid laser welding; Laser shock processing; Synchrotron radiation X-ray micro-tomography
资金
- Self-developed Research Project of the State Key Lab. of Traction Power [2015TPL_T07, TPL1505]
The fatigue behavior of laser hybrid welded 7000 series aluminum alloys with high Zn was investigated by electron backscattered diffraction, transmission electron microscopy, energy-dispersive spectroscopy, basic mechanical tests, fatigue cracking rate, synchrotron radiation X-ray computed micro-tomography, high-cycle fatigue and residual stress-based fatigue crack growth simulation. The results show that hybrid laser welding process leads to essential changes of microstructure and micro-hardness. It has also been found that the fatigue performance of grinded laser shock treated joints is significantly improved compared with that of as-received welded joints. Besides, hybrid laser welded joints present slightly higher fatigue crack propagation rate than base metal under load ratios of R = 0.1 and 0.3, which can be intrinsically attributed to the higher crackability of weld and inner porosity in terms of grain disorientation and three-dimensional gas pores. Based on finite element modeling, a new fatigue crack propagation life model is established by incorporating weld residual stress, and the predictions are in good agreement with experimental results under different welding parameters. (C) 2016 Elsevier Ltd. All rights reserved.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据