期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：300
期号：4
页码：1-7
DOI：10.1088/1755-1315/300/4/042017
出版社：IOP Publishing
摘要：In a power plant, the bellows of the lower part of the expansion joint for pumping and heating of the NO.8 turbo-generator unit breaked, and the internal guide plate was teared along the welding seam. Through observation of macroscopic morphology, hardness analysis, metallographic examination, energy spectrum analysis and other means, the corrugated pipe material itself unqualified performance, stress corrosion cracking, corrosion and other reasons were eliminated. According to the micro-characteristics of fatigue fracture and the service environment of the bellows, it is concluded that the main reason of break is the fatigue cracking of the bellows under the impact of the air flow and vibration.
