科研之友
微信
新浪微博
Facebook
分享链接
摘要
The occurrence of cracks at the electron beam (EB) welds of ethylene tubes in radiant chambers after 1-2 years in service has led to serious concerns. Failure analysis of the sample using optical microscopy, scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS) clearly reveals a centerline with dendritic crystals and blocky precipitates present at the welds, where the cracks occurred. Niobium-depletion at the EB weld centerline is mainly responsible for the carbide precipitates and cracks. Operation processes such as frequent start-stop cycling accelerated the cracks.
- 出版日期2011-7
- 单位华东理工大学
