Acoustic emission during fatigue crack propagation in a micro-alloyed steel and welds

被引：75
|
作者：
Han, Zhiyuan [1 ]
Luo, Hongyun [1 ]
Cao, Jingwei [1 ]
Wang, Hongwei [1 ]
机构：
[1] Beihang Univ, Key Lab Aerosp Mat & Performance, Minist Educ, Sch Mat Sci & Engn, Beijing, Peoples R China
来源：
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2011年 / 528卷 / 25-26期
关键词：
Acoustic emission; Fatigue; Weld; AE source mechanisms; MICROSTRUCTURE; PREDICTION; TI-6AL-4V; BEHAVIOR; GROWTH;
D O I：
10.1016/j.msea.2011.06.065
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The acoustic emission (AE) behaviors and source mechanisms during fatigue crack propagation in the base metal and weld of Q345 steel were investigated in this study. The fatigue properties and acoustic emission characteristics were analyzed based on the micro-structural and fractographic observations. The source mechanisms of acoustic emission for the three stages during fatigue were proposed, which were crack initiation, plastic activities ahead of the crack tip, and shearing of ligaments between micro-voids and micro-cracks respectively. The effects of the micro-structure and peak load on acoustic emission during fatigue crack propagation were also discussed in this study. The results showed that the acoustic emission was more sensitive to the changes in the fracture mode and could be used to monitor the fatigue damage developed in structures. (C) 2011 Elsevier B.V. All rights reserved.
引用
收藏
页码：7751 / 7756
页数：6
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