Analysis of failed electron beam welds in ethylene cracking tubes
Source abstract
Abstract
Abstract 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.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Hydrogen embrittlement and corrosion behaviors in metals · Electron and X-Ray Spectroscopy Techniques · Corrosion Behavior and Inhibition
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (25)
Show source-provided references
1. Criteria for the evaluation of damage and remaining life in reformer furnace tubes10.1016/0308-0161(95)00098-4 ↗
2. Analysis of failed reformer tubes10.1016/S1350-6307(02)00029-8 ↗
3. Analysis of failed ethylene cracking tubes10.1016/j.engfailanal.2004.03.012 ↗
4. Failure of reform tube of an ammonia plant10.1016/S1350-6307(01)00039-5 ↗
5. Evaluation of creep–fatigue damage interaction in HK 40 alloy10.1115/1.2919322 ↗
6. Damage assessment and maintenance strategy of hydrogen reformer furnace tubes10.1016/S1350-6307(98)00042-9 ↗
7. Assessment of damage and life prediction of austenitic stainless steel under high temperature creep–fatigue interaction condition10.1016/S0921-5093(01)01118-2 ↗
8. A metallographic study of aging in a cast heat-resisting alloy10.1016/S1044-5803(00)00047-4 ↗
9. Microstructure of HK40 alloy after high temperature service in oxidizing/carburizing environment
10. Failure Investigation of a Furnace Tube Support10.1007/s11668-008-9191-0 ↗
11. Sigma-phase formation in nitronic 50 and nitronic 50 w stainless steels10.1007/BF00551317 ↗
12. Sigma-phase formation upon solidification rate in heat-resistant steels10.4028/www.scientific.net/MSF.426-432.1301 ↗
13. Effect of aging at 700°C on precipitation and toughness of AISI 321 and AISI 347 austenitic stainless steel welds10.1016/j.nucengdes.2005.06.006 ↗
14. Control of the electron beam active zone position in electron beam welding processes10.1016/j.vacuum.2003.11.004 ↗
15. Introduction into the electron beam welding of austenitic 321-type stainless steel10.1016/S0924-0136(97)00485-8 ↗
16. Influence of microstructure and composition on mechanical properties of some AlSl 300 series weld metals10.1179/imr.1993.38.1.25 ↗
17. Harries DR. Physical metallurgy of Fe–Cr–Ni austenitic steels. Mechanical behaviour and nuclear applications of stainless steel at elevated temperatures. In: Proceedings of the international conference. The metals society. London; 1982. p. 1–15.
18. The precipitation characteristics of 20% Cr/25% Ni–Nb stabilized stainless steel10.1016/0001-6160(88)90105-8 ↗
19. Effect of minor niobium addition on microstructure of a nickel-base directionally solidified superalloy10.1016/j.msea.2007.06.041 ↗
20. Niobium in centrifugally cast tubes for petrochemical applications
21. The role of niobium in wrought superalloys
22. Effects of Si content on the microstructure of modified-HP austenitic steels10.1016/1044-5803(93)90071-3 ↗
23. Microstructural factors that determine the weldability of a high Cr-high Si HK 40 alloy10.1016/S0254-0584(00)00265-0 ↗
24. Effect of weld solidification mode on tensile properties of aluminum weld metal
25. Improvement of mechanical properties of Inconel 718 electron beam welds—influence of welding techniques and postweld heat treatment10.1007/s00170-008-1751-7 ↗