5A06铝合金焊接接头裂纹失效分析
张红霞, 刘晓晴, 闫志峰, 王文先, 李永莲
太原理工大学 材料科学与工程学院,太原 030024
Failure Analysis of 5A06 Aluminum Alloy Welding Joint Crack
ZHANG Hong-xia, LIU Xiao-qing, YAN Zhi-feng, WANG Wen-xian, LI Yong-lian
College of Materials Science and Engineering, Taiyuan University of Technology, Taiyuan 030024, China
摘要 针对5A06铝合金焊缝附近出现的裂纹进行了分析。5A06铝合金母材、焊缝及热影响区组织分析结果表明,材料成型后的组织不均匀,并且存在夹杂物,晶内和晶界有析出相出现。采用光学显微镜对裂纹的扩展特征进行分析,结果表明,裂纹在材料边缘夹杂物处启裂,以沿晶的特征进行扩展。采用SEM对断口进行微观和宏观分析,断口中存在二次裂纹,断口为脆性断裂。
关键词 ：
5A06铝合金 ,
二次裂纹 ,
脆性断裂 ,
沿晶断裂
Abstract ：The cracks near 5A06 aluminum alloy welding joint are analyzed. The metallurgical structure of base metal, welding joint and heat-affected zone are analyzed and the results indicate that organization is uneven and there is inclusion in the aluminum alloy, the precipitates are found in grain inner and boundary. The crack propagation character are analyzed and the results indicate that the crack originates from the inclusion of the specimen edge, and crack propagation along the grain boundary. Micro-fracture and macro fracture are analyzed by SEM and found that there are secondary cracks in the fracture, and the fracture was brittle fracture.
Key words ：
5A06 aluminum alloy
secondary crack
brittle fracture
intergranular fracture
收稿日期: 2012-04-01
出版日期: 2013-03-20
基金资助: 国家自然科学基金项目(51175364)
作者简介 : 张红霞(1968-),女,博士,副教授,主要从事焊接结构失效及安全评定,材料连接及界面行为研究,联系地址:太原市迎泽西大街79号,太原理工大学材料科学与工程学院(030024),E-mail:hongxzhang@163.com
引用本文:
张红霞, 刘晓晴, 闫志峰, 王文先, 李永莲. 5A06铝合金焊接接头裂纹失效分析[J]. 材料工程, 2013, 0(3): 27-31,37.
链接本文:
http://jme.biam.ac.cn/CN/10.3969/j.issn.1001-4381.2013.03.006
或
http://jme.biam.ac.cn/CN/Y2013/V0/I3/27
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