Exposure of FeCrAl Overlay Welds on Superheater Tubes: Influence of Local Environment on Degradation

Two experimental FeCrAl alloy overlay welds on tube shields were exposed in the superheater of a full-size waste fired boiler for 6 months. The tube shields were in different tube lines and positions within the superheater chamber to investigate possible heterogeneities in the exposure environment....

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Bibliographic Details
Published inJournal of failure analysis and prevention Vol. 22; no. 1; pp. 400 - 408
Main Authors Valiente Bermejo, M. A., Magniez, L., Jonasson, A., Selin, S., Frodigh, M., Hurtig, K., Stridh, L-E., Karlsson, L.
Format Journal Article
LanguageEnglish
Published New York Springer US 01.02.2022
Springer Nature B.V
Subjects
Boiler
Chambers
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Corrosion and Coatings
Corrosion rate
Erosion rates
Erosion-corrosion
Exposure
FeCrAl alloys
Ferrous alloys
Inspection
Materials Science
Materials selection
Overlay welding
Production Technology
Produktionsteknik
Quality Control
Reliability
Safety and Risk
Shields
Solid Mechanics
Superheater
Superheaters
Technical Article > -Peer-Reviewed
Tribology
Tubes
Boiler
Superheater
FeCrAl alloys
Overlay welding
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Summary:Two experimental FeCrAl alloy overlay welds on tube shields were exposed in the superheater of a full-size waste fired boiler for 6 months. The tube shields were in different tube lines and positions within the superheater chamber to investigate possible heterogeneities in the exposure environment. The visual inspection of the exposed tube shields and the corrosion-erosion rates calculated from the analysis of cross-sections showed that the mid-length roof location experienced the most aggressive environment. The compositional differences between the two experimental alloys were not found to be determinant in their performance under these specific exposure conditions. It was concluded that erosion had a decisive influence on the results. The identification of local differences within the superheater chamber is important when deciding on the material selection for the different areas and locations to be protected. The output of this study is therefore interesting for further design consideration of superheaters as well as for future planning of exposures.
ISSN:1547-7029
1864-1245
1728-5674
1864-1245
DOI:10.1007/s11668-022-01337-5