Stress corrosion cracking of cabinet of 7003 aluminum alloy

被引：0
作者：
Zhang, Shu-Fang [1 ]
Wang, Xiao-Min [2 ]
Chen, Hui [1 ]
Liao, Xiao-Yao [2 ]
机构：
[1] Research Center of Sichuan Advanced Welding and Surface Engineering, Southwest Jiaotong University, Chengdu
[2] College of Life Science and Engineering, Southwest Jiaotong University, Chengdu
来源：
Cailiao Gongcheng/Journal of Materials Engineering | 2015年 / 43卷 / 07期
关键词：
7003 aluminum alloy; Cleavage step; Intergranular crack; River pattern; Stress corrosion cracking;
D O I：
10.11868/j.issn.1001-4381.2015.07.018
中图分类号：
学科分类号：
摘要：
Cracks, discovered on the edge of 7003 Al-alloy cabinet of the high speed train was analyzed by means of optical microscope, scanning electric microscope (SEM) and electronic differential system (EDS). It is found that cracks with many branches propagated along the grain boundaries, the fracture is sugar candy pattern, and capillary and chicken claw cracks are on the grain plane. The crack is stress corrosion crack (SCC) induced by the hydrogen embrittlement. The SCC sensitivity of 7003 Al-alloy was evaluated by slow strain rate test (SSRT) and constant displacement test. The result of SSRT shows that the sensitivity index of 7003 Al-alloy is 0.2. Its fracture is mixture fracture of transgranular and intergranular in 3.5% NaCl solution. There are many second cracks, cleavage steps and river patterns on the transgranular fracture. The result of constant displacement test indicates that the cracks propagate to 700 μm after corrosion for 28 days, and tongue protrusions and grooves occur in the stress corrosion zone. The 7003 Al-alloy is obviously sensitive to the SCC. ©, 2015, Beijing Institute of Aeronautical Materials (BIAM). All right reserved.
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页码：105 / 112
页数：7
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