首页|Analysis of failed electron beam welds in ethylene cracking tubes
Analysis of failed electron beam welds in ethylene cracking tubes
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NSTL
Elsevier
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.
Electron beam weldEthylene cracking tubesCrackingNiobium-depletion
Kaishu Guan、Qiangqi Wang
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The Key Laboratory of Safety Science of Pressurized System, Ministry of Education, East China University of Science and Technology, Shanghai 200237, China
NSTL
Elsevier
