Crack Analysis in Welds of Boiler Tubes Made of T24 Steel
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47718684%3A_____%2F25%3A10002953" target="_blank" >RIV/47718684:_____/25:10002953 - isvavai.cz</a>
Result on the web
<a href="https://www.scientific.net/MSF.1166.31" target="_blank" >https://www.scientific.net/MSF.1166.31</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.4028/p-9HzbjV" target="_blank" >10.4028/p-9HzbjV</a>
Alternative languages
Result language
angličtina
Original language name
Crack Analysis in Welds of Boiler Tubes Made of T24 Steel
Original language description
The paper deals with the material analysis of cracks in welded joints of tubes made of T/P24 steel of membrane wall panels of superheater from a boiler of a thermal power plant operating in supercritical conditions of inlet steam. A total of ten cracks were evaluated, mainly from longitudinal assembly welds tube - flag. Using light microscopy and scanning electron microscopy, the macrostructure and microstructure of cross-sections of the tubes were observed, HV1 hardness profiles were measured and fractographic analysis of fracture surfaces of cracks was performed. Cracks are initiated on the outer surface of tubes, dominantly on the heated side of the boiler at the interface of the weld metal and the coarse-grained zone of the heat-affected zone of the base material of the tube. They grow more or less in straight course towards the inner surface of the tube. The initiation area is characterized by very coarse prior austenitic grain and secondary hardening leading to hardnesses of around 400 HV1.The cracks were probably formed by several mechanisms – relaxation cracking and fatigue. Theformation of the crack was influenced by a combination of several negative factors: suboptimalwelding process leading to defects in welds, unfavorable microstructure state associated with highhardness, high level of residual stresses and stresses induced by temperature changes duringshutdowns and start-up of boiler.
Czech name
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Czech description
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Classification
Type
J<sub>ost</sub> - Miscellaneous article in a specialist periodical
CEP classification
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OECD FORD branch
20501 - Materials engineering
Result continuities
Project
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Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2025
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Materials Science Forum
ISSN
1662-9752
e-ISSN
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Volume of the periodical
2025
Issue of the periodical within the volume
1166
Country of publishing house
CH - SWITZERLAND
Number of pages
7
Pages from-to
31-37
UT code for WoS article
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EID of the result in the Scopus database
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