Fatigue crack initiation behaviors throughout friction stir welded joints in AA7075-T6 in ultrasonic fatigue

被引：31
|
作者：
He, Chao [1 ,2 ]
Liu, Yongjie [1 ]
Dong, Jiangfeng [1 ]
Wang, Qingyuan [1 ]
Wagner, Daniele [2 ]
Bathias, Claude [2 ]
机构：
[1] Sichuan Univ, Minist Educ, Key Lab Energy Engn Safety & Disaster Mech, Chengdu 610065, Peoples R China
[2] Univ Paris Quest Nanterre, LEME Lab, F-92410 Ville Davray, France
来源：
INTERNATIONAL JOURNAL OF FATIGUE | 2015年 / 81卷
基金：
中国国家自然科学基金;
关键词：
Very high cycle fatigue; Friction stir welding; Aluminum alloy; Fatigue crack initiation; HIGH-CYCLE FATIGUE; HIGH-STRENGTH STEELS; S-N CURVE; ALUMINUM-ALLOY; GIGACYCLE FATIGUE; MECHANICAL-PROPERTIES; WELDING PARAMETERS; GROWTH; MICROSTRUCTURE; TENSILE;
D O I：
10.1016/j.ijfatigue.2015.07.012
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
This paper presents the results of experimental investigation on fatigue behaviors of friction stir welded joints in AA7075-T6 with ultrasonic fatigue test system (20 kHz). Two kinds of particles, Fe-rich intermetallic compounds and Mg2Si-based particles, governed the fatigue crack initiation. The plastic deformation and recrystallization during welding process led to the changes in particle size and micro crack occurrence between thermo-mechanically affected zone (TMAZ) and nugget zone (NZ). Therefore, the fatigue crack initiation sites leaned to be located at the TMAZ in short fatigue life, or at the NZ in very high cycle fatigue regime. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：171 / 178
页数：8
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