Laves-phase evolution during aging in 9Cr-1.8W-0.5Mo-VNb steel for USC power plants

Article English OPEN
Wang, Xue ; Xu, Qiang ; Yu, Shu-min ; Hu, Lei ; Liu, Hong ; Ren, Yao-yao (2015)

Long term precipitation and coarsening of Laves-phase in tungsten strengthened 9% Cr steel under thermal aging at 923 K was investigated and reported in this paper. It experimentally measured the evolution of mean particle size, the number density, the volume fraction of Laves-phase precipitates, the partition coefficients of W and Mo in the matrix, as well as the change of hardness. Its main conclusions were: 1) Laves-phase nucleates and grows rapidly on grain boundaries and lath boundaries within the first 1500 h of aging time; 2) The two stages characteristics and kinetics of Laves-phase nucleation and growth which were determined experimentally; 3) The coarsening of Laves-phase is much faster than that of M23C6 carbides; 4) The precipitation of Laves-phase produces a pronounced matrix depletion of W and Mo atoms; and 5) The precipitated Laves-phase gives rise to weaker precipitation strengthening in comparison with M23C6 carbides, and causes the loss of hardness due to the depletion of Mo and W from the solid solution. This paper contributes to the knowledge of kinetics of Laves-phase precipitation and coarsening, providing the essential information for comparative investigation of creep damage mechanisms. This paper also contributes to the understanding the creep damage broadly.
  • References (4)

    [1]Bugge J.,Kjaer Sven,Blum R., Energy 2006;31:1437-45.

    [2]Sheng Q., Liu H G., Electric Power Constrcution (China). 2010: 31: 71 [3]Muramatasa K., in :Viswanathan R, Nutting J (Eds), Proceedings of the Advanced Heat Resistant Steels for Power Generation, The University Press, Cambridge, 1998, P. 543.

    [4]Yoshizawa M., Igarashi M., Moriguchi K., Iseda A., Armaki H G, Maruyama K., Mater. Sci. Eng. A 2009 ;510-511 :162-168.

    [5]Hosoi Y., Wade N., Kunimitsu S., Urita T., J Nucl. Mater. 1986 ;461 :141-3.

  • Metrics
    views in OpenAIRE
    views in local repository
    downloads in local repository

    The information is available from the following content providers:

    From Number Of Views Number Of Downloads
    University of Huddersfield Repository - IRUS-UK 0 21
Share - Bookmark