MICROSTRUCTURE AND PROPERTIES DEGRADATION OF P/T 91, 92 STEELS WELDMENTS IN CREEP CONDITIONS

  • Ladislav Falat Institute of Materials Research Slovak Academy of Sciences
  • Viera Homolova Institute of Materials Research Slovak Academy of Sciences
  • Jan Kepic Institute of Materials Research Slovak Academy of Sciences
  • Milan Svoboda Institute of Physics of Materials, Academy of Sciences of Czech Republic
  • Anna Vyrostkova Institute of Materials Research Slovak Academy of Sciences

Abstract


Abstract

     The studies were performed on dissimilar ferritic/austenitic weldments between 9Cr tempered martensitic steels of the grades either P/T 91 or 92 and unstabilised AISI316H austenitic steel. The welded joints were fabricated using the fusion welding by tungsten inert gas (TIG) method with Ni-based filler metal. Microstructural analyses were performed using light and electron microscopy. Microstructural gradient in HAZ regions of 9Cr steels remained preserved during creep exposure. All weldments fractured by the type IV failure within their fine-grained intercritical HAZ regions. The most remarkable microstructural change during creep was the precipitation of intermetallic Laves phase. Experimentally determined phases of the samples after creep exposure are in good agreement with equilibrium thermodynamic calculations.

Published
2014/02/10
How to Cite
Falat, L., Homolova, V., Kepic, J., Svoboda, M., & Vyrostkova, A. (2012). MICROSTRUCTURE AND PROPERTIES DEGRADATION OF P/T 91, 92 STEELS WELDMENTS IN CREEP CONDITIONS. Journal of Mining and Metallurgy, Section B: Metallurgy, 48(3), 461. Retrieved from https://aseestant.ceon.rs/index.php/jmm/article/view/2188
Issue
Vol. 48 No. 3 (2012)
Section
Original Scientific Paper

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