Fatigue behavior and life prediction of A7N01 aluminium alloy welded joint

被引：16
作者：
Liu Xue-song [1 ]
Zhang Liang [1 ]
Wang Lin-sen [1 ,2 ]
Wu Shuang-hui [1 ]
Fang Hong-yuan [1 ]
机构：
[1] Harbin Inst Technol, State Key Lab Adv Welding & Joining, Harbin 150001, Peoples R China
[2] Dongfang Boiler Grp Co Ltd, Welding Proc Sect, Zigong 643001, Peoples R China
来源：
TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2012年 / 22卷 / 12期
关键词：
aluminium alloy; A7N01 aluminum alloy; welded joint; crack initiation; fatigue; fatigue life; life prediction; CRACK GROWTH-BEHAVIOR; ZN-MG ALLOY; MECHANICAL-PROPERTIES; AGING TREATMENT;
D O I：
10.1016/S1003-6326(11)61552-5
中图分类号：
TF [冶金工业];
学科分类号：
0806 ;
摘要：
Fatigue characteristics of A7N01 aluminium alloy welded joint were investigated and a fatigue crack initiation life-based model was proposed. The difference of fatigue crack initiation life among base metal, weld metal and heat affected zone (HAZ) is slight. Furthermore, the ratio of fatigue crack initiation life (N-i) to fatigue life to failure(N-f) is a material dependent parameter, 26.32%, 40.21% and 60.67% for base metal, HAZ and weld metal, respectively. Total fatigue life predicted using the presented model is in good agreement with the experimental data and that using Basquin's model. The observation results of fatigue fracture surfaces, using scanning electron microscope (SEM), demonstrate that fatigue crack initiates from smooth surface due to welding process for weld metal, blowhole in HAZ causes fatigue crack initiation, and the crushed second phase particles play an important part in fatigue crack initiation in base metal.
引用
收藏
页码：2930 / 2936
页数：7
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