Influence of precipitation on dislocation substructure and creep properties of P91 steel weld joints

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F47718684%3A_____%2F10%3A%230000435" target="_blank" >RIV/47718684:_____/10:#0000435 - 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
Influence of precipitation on dislocation substructure and creep properties of P91 steel weld joints
Original language description
Two trial weld joints were prepared using the GTAW and SMAW method and they underwent creep testing at temperatures from 525°C to 625°C. The longest time to rupture was 45,811 hrs. Two main processes occurred during creep exposures: recovery and precipitation of secondary phases. A slight coarsening of M23C6 carbide, precipitation of Laves phase and Z-phase were observed after long tests at high temperatures. Some differences in microstructure and creep failure were found in individual zones of weldments. After long exposure at temperatures up to 600°C fractures occurred in the fine grain heat affected zone as a result of a low density of fine vanadium nitride and a high density of coarse particles at grain and subgrain boundaries. At 625°C growth of Laves phase caused a softening of the ferritic matrix and crack propagation in the weld metal.
Czech name
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Czech description
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Type
J<sub>x</sub> - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
JG - Metallurgy, metal materials
OECD FORD branch
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Publication year
2010
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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