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Microstructure Characterization of a Dissimilar 14MoV6-3/T91 Weld after Long-Term Service Exposure at 580°C

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Abstract:

Applications of advanced heat resistant ferritic steels in boiler repairs require detailed information on the creep behaviour of welds made of various combinations of steels. The paper deals with the results of hardness and microstructure characterization of a dissimilar circumferential weld of 14MoV6-3 and P91 tubes after about 10 years of service exposure in a boiler operated at 580 °C and steam pressure of 10.3 MPa. The P91 tube (f38x4 mm) was welded to the 14MoV6-3 tube (f38x6.3 mm) using the GTAW (141) technology. Bőhler-FOX IN 9-IG (3Cr0.5Mo0.3V) wires were applied as a filler material. Microhardness evaluation after long-term service exposure revealed two carburized zones, values in these zones did not exceed 350 HV0.5. The slowdown of recrystallization in partially decarburized areas of the 14MoV6-3 and the WM suppressed the formation of soft ferritic bands along fusion lines. This phenomenon is related to the high thermodynamic stability of V(C,N) particles in vanadium-bearing low alloy heat resistant ferritic steels at temperatures below 600 °C.

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Periodical:

Key Engineering Materials (Volume 1046)

Pages:

27-33

DOI:

https://doi.org/10.4028/p-N5Ea4h

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Online since:

March 2026

Authors:

Vlastimil Vodárek*, Renáta Palupčíková, Petra Váňová

Keywords:

Degradation, Dissimilar Ferritic Welds, Hardness, Microstructural Stability, Precipitation

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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References

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