Thermodynamic and kinetic modelling: creep resistant materials

  • Hald J
  • Korcakova L
  • Danielsen H
 et al. 
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The use of thermodynamic and kinetic modelling of microstructure
evolution in materials exposed to high temperatures in power plants is
demonstrated with two examples. Precipitate stability in martensitic 9 -
12% Cr steels is modelled including equilibrium phase stability, growth
of Laves phase particles and coarsening of MX, M23C6 and Laves phase
particles. The modelling provided new insight into the long term
stability of new steels. Modelling of the detrimental precipitation of Z
phase Cr( V, Nb) N is described, which points to new approaches in alloy
development for higher temperatures. Predictions of interdiffusion
between a MCrAlY coating and an IN738 bulk alloy by multicomponent
diffusion calculations provide a highly versatile tool for life
assessment of service exposed gas turbine components as well as for the
development of improved coatings.

Author-supplied keywords

  • 12
  • 9
  • coarsening
  • cr steels
  • in738
  • interdiffusion
  • mcraly coating
  • microstructure modelling
  • precipitate growth
  • z phase

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  • J. Hald

  • L. Korcakova

  • H. K. Danielsen

  • K. V. Dahl

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