期刊
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
卷 20, 期 1, 页码 11-19出版社
TAYLOR & FRANCIS LTD
DOI: 10.1179/1362171814Y.0000000249
关键词
Gas porosity; Fatigue crack and damage; Aluminium alloy; Synchrotron radiation X-ray micro tomography; Hybrid laser welding
资金
- Large Scientific Facilities Joint Basic Research Foundation of China
- China Postdoctoral Science Foundation [2013M 531980]
- China High-speed Railway Joint Basic Research Key Project [U1234208]
- Fundamental Research Fund for the Central Universities [2682013CX030]
The interaction between the pores and the fatigue damage in 7075-T6 joints was characterised via high resolution synchrotron radiation X-ray microcomputed tomography. The spatial distribution and growth behaviour of the pores were investigated and quantified. The gas porosity inside 7075-T6 hybrid welds was found to play a significant role in the fatigue crack nucleation and propagation process. The volume fraction and the total number of pores increased slightly with increasing number of fatigue cycles, which provides a key indicator for the damage evolution. Experimental results indicate that the micropores grew and distorted during fatigue cyclic loading, eventually resulting in fatigue cracks. Under cyclic loads, the maximum micropore is usually not a favourable site, in terms of physical suitability, for fatigue crack initiation and propagation, and the diameter of the cracked pores is in the range of 10-100 mu m.
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