Microstructural Stability of P23/P91 Dissimilar Welds during Creep at 500°C

Lucie Střílková; Jan Holešinský; Anastasia Maslova; Zdeněk Kuboň; Vlastimil Vodárek

doi:10.4028/www.scientific.net/MSF.782.319

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HomeMaterials Science ForumMaterials Science Forum Vol. 782Microstructural Stability of P23/P91 Dissimilar...

Microstructural Stability of P23/P91 Dissimilar Welds during Creep at 500°C

Abstract:

This paper deals with microstructural stability of P23/P91 dissimilar welds during long-term creep exposure at 500°C. Detailed TEM investigations on minor phase evolution were performed on specimens after long-term creep exposure. Microstructural changes in the decarburized layer of the P23 steel were studied using EBSD and TEM. Experimental data on minor phase evolution were compared to the results of thermodynamic (Thermocalc) and kinetic (Dictra) simulations. Evolution of minor phases in the P23/P91 welds during creep at 500°C was in a good agreement with results of microstructural modelling. Partial decarburization of the P23 occurred at the expense of dissolving M₇C₃ phase. Microstructure of the partly decarburized zone in the P23 steel remained bainitic in all specimens investigated. In spite of the partial decarburization in the P23 steel during longterm creep exposure at 500°C, creep failures occurred in the ICHAZ of the P23 steel.

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Periodical:

Materials Science Forum (Volume 782)

Pages:

319-324

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.782.319

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Online since:

April 2014

Authors:

Lucie Střílková, Jan Holešinský, Anastasia Maslova, Zdeněk Kuboň, Vlastimil Vodárek

Keywords:

Dissimilar P23/P91 Welds, EBSD, Microstructural Modelling, Microstructural Stability, TEM

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References

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