Causes of Failure of Weld Joint During Long Time Creep Testing

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47718684%3A_____%2F10%3A%230000431" target="_blank" >RIV/47718684:_____/10:#0000431 - isvavai.cz</a>
Result on the web
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DOI - Digital Object Identifier
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Result language
angličtina
Original language name
Causes of Failure of Weld Joint During Long Time Creep Testing
Original language description
The trial weld joint made of P91 steel was prepared using GTAW & SMAW method. Creep testing of smooth cross-weld samples was carried out at a temperature range from 525°C to 625°C and under stresses from 40 MPa to 240 MPa. Fracture occurred in HAZ and inthe WM near the fussion line, if high stresses were applied at 525 °C. Cracks propagated through the central part of the WM after low loading at 625 °C. All other fractures were located in the fine grained HAZ; type IV cracking occurred. Failure in theHAZ is caused with fine grained polygonal ferritic structure with a high density of coarse chromium carbides and Laves phase at grain and subgrain boundaries and relatively low density of intragranular vanadium nitride. At 625 °C growth of Laves phase occurs especially in the weld metal and causes depletion of solid solution. After creep exposure for about 30,000hrs this process resulted in a significant softening of ferritic matrix and occurrence of a ductile fracture in WM (type I frac
Czech name
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Czech description
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Publication year
2010
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection
Proc. of 19th International Metallurgical and Materials Conference METAL 2010
ISBN
978-80-87294-17-8
ISSN
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e-ISSN
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Number of pages
6
Pages from-to
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Publisher name
Tanger, spol. s r.o., Ostrava
Place of publication
Ostrava
Event location
Rožnov pod Radhoštěm
Event date
Jan 1, 2010
Type of event by nationality
WRD - Celosvětová akce
UT code for WoS article
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