Failure Analysis of Cracked Reducer Flange

被引：3

作者：

Habib, Khaled ^{[1
]}

机构：

[1] KISR, Mat Sci Lab, Dept Adv Syst, POB 24885, Safat 13109, Kuwait

来源：

JOURNAL OF FAILURE ANALYSIS AND PREVENTION | 2010年 / 10卷 / 06期

关键词：

Reducer flange; Pitting corrosion; Stress corrosion cracking; Metallographic examination; X-ray; Scanning electron microscopy; Fracture roughness; Stress intensity factor;

D O I：

10.1007/s11668-010-9389-9

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

A cracked reducer flange was analyzed for the cause of the failure. The flange was carefully cut to obtain samples for metallographic, X-ray, and scanning electron microscopy (SEM) Examinations. The examinations revealed that the introduction of chloride ions in the operational service led to pitting corrosion in the inner surface of the flange. Chloride ion inclusions were probably the result of chemical contaminations, i.e., cleaning chemicals' contamination during shutdown of the operation. The introduction of corrosion pits caused unexpected load stress intensification and cracking of the flange. Consequently, stress corrosion cracking emanated from the pits under the influence of chloride attack and operational pressure. Then the cracks propagated in a transgranular manner, in the radial direction of the flange, until the final failure occurred.

引用

页码：480 / 485

页数：6