电焊机2017，Vol.47Issue(10)：58-62,5.DOI:10.7512/j.issn.1001-2303.2017.10.12
焊接气孔缺陷对A7N01铝合金焊接接头腐蚀疲劳性能的影响
Influence of welding pore defect on corrosion fatigue property of welded joint of A7N01 aluminum alloy
王新 1周强 2徐晓龙2
作者信息
- 1. 中车青岛四方机车车辆股份有限公司,山东青岛266111
- 2. 西南交通大学材料科学与工程学院,四川成都610031
- 折叠
摘要
Abstract
The welded joints of A7N01 aluminum alloy with different weld porosities are prepared in environment with different humidity.The influence of pores defect on corrosion fatigue property of the welded joints is studied by the conditional corrosion fatigue strength test and the fracture morphology observation.The results show that the average porosity increases from 0.07％ to 0.16％ when the humidity enhances to 70％,and the conditional corrosion fatigue strength decreases from 110 MPa to 100 MPa.Pore defects obviously affect the corrosion fatigue property of welded joints of A7N01 aluminum alloy.The pores in welds will cause serious gap effect and stress concentration,which lead to the priority initiation of cracks near the pores.The cracks form mixed fracture morphology,which propagates along the crystal and fragile fatigue strips under the collective effect of stress and corrosion medium.关键词
A7N01铝合金/焊接接头/气孔/腐蚀疲劳Key words
A7N01 aluminum alloy/welded joint/pore/corrosion fatigue分类
矿业与冶金引用本文复制引用
王新,周强,徐晓龙..焊接气孔缺陷对A7N01铝合金焊接接头腐蚀疲劳性能的影响[J].电焊机,2017,47(10):58-62,5.
