Failure analysis of the brass tubes in a lubricating oil cooler

被引：14
|
作者：
Qu, S. [1 ]
Yao, G. [1 ]
Tian, J. F. [1 ]
Zhang, Z. F. [1 ]
机构：
[1] Chinese Acad Sci, Inst Met Res, Shenyang Natl Lab Mat Sci, Shenyang 110016, Peoples R China
来源：
ENGINEERING FAILURE ANALYSIS | 2011年 / 18卷 / 08期
关键词：
Lubricating oil cooler; Brass tubes; Pit; Dezincification; Stress corrosion cracking (SCC);
D O I：
10.1016/j.engfailanal.2011.07.018
中图分类号：
TH [机械、仪表工业];
学科分类号：
0802 ;
摘要：
Failure analysis was carried out on leaked brass tubes of a lubricating oil cooler. Direct evidences of dezincification and stress corrosion cracking (SCC) were observed by scanning electron microscope (SEM) and energy dispersive spectroscopic (EDS) analysis. It is found that there are many small pits distributed on the fracture surface and EDS analysis revealed the occurrence of dezincification in the small pits. SCC was observed on the cross-sectional plane of the fracture by SEM. Ammonia test has proved the existence of residual stress in the as-received tubes. It is determined that the brass tubes have been suffered from the coaction between dezincification and SCC. (C) 2011 Elsevier Ltd. All rights reserved.
引用
收藏
页码：2232 / 2239
页数：8
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