% IMPORTANT: The following is UTF-8 encoded.  This means that in the presence
% of non-ASCII characters, it will not work with BibTeX 0.99 or older.
% Instead, you should use an up-to-date BibTeX implementation like “bibtex8” or
% “biber”.

@PHDTHESIS{AsensioJimenez:133849,
      author       = {Asensio-Jimenez, Cristina},
      title        = {{E}ffect of {C}omposition, {M}icrostructure and {C}omponent
                      {T}hickness on the {O}xidation {B}ehaviour of {L}aves
                      {P}hase {S}trengthened {I}nterconnect {S}teel for {S}olid
                      {O}xide {F}uel {C}ells ({SOFC})},
      volume       = {204},
      school       = {RWTH Aachen},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2013-02240},
      isbn         = {978-3-89336-935-5},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {210 S.},
      year         = {2014},
      note         = {RWTH Aachen, Diss., 2013},
      abstract     = {The high-Cr, Laves phase strengthened ferritic steel,
                      Crofer 22 H, has recently been proposed as construction
                      material for interconnects in solid oxide fuel cells (SOFC).
                      Aim of the present investigation was to get more insight in
                      the details of SOFC relevant properties, mostly oxidation
                      behaviour and oxide electronic conductivity, in simulated
                      SOFC service environments as a function of temperature, with
                      main emphasis on themost commonly used operating temperature
                      800 °C. The present studies of Crofer 22 H, showed that the
                      consumption of chromium from the alloy as a result of
                      chromia surface scale formation ends up in formation of a
                      subsurface layer in which the Laves phase is depleted. In
                      parallel, formation of a thin zone near the scale/steel
                      interface occurs in which the Laves phase is enriched.
                      Modeling revealed that this depletion/enrichment process can
                      be explained by the influence of chromium concentration on
                      the niobium activity in the alloy matrix. Moreover,
                      experiments with solution annealed and pre-aged materials
                      showed that the subsurface phasetransformation processes are
                      at least partially affected by preferential Laves-phase
                      nucleation at the scale/steel interface. Experimental
                      results and theoretical considerations show that the
                      specimen/componentthickness dependence of the oxidation rate
                      is related to relaxation of oxide growth stress by creep of
                      the metallic substrate. Due to poor intrinsic creep
                      resistance, thin Crofer 22 APU specimens exhibit enhanced
                      oxidation rates in air at 800 °C. For the more creep
                      resistant steel Crofer 22 H this only occurs after Laves
                      phase coarsening which results in a substantial decrease in
                      intrinsic creep strength of the alloy. The resistance of
                      thethinnest samples against substantial creep deformation
                      then becomes gradually too small to prevent substantial
                      relaxation of oxide growth stress, leading to enhanced
                      oxidation rates. However, in anode gas hardly any
                      specimen/component thickness dependence of the oxidation
                      rate was found, which is believed to be related to a
                      different oxide scale composition and microstructure.},
      keywords     = {Dissertation (GND)},
      cin          = {IEK-2},
      cid          = {I:(DE-Juel1)IEK-2-20101013},
      pnm          = {123 - Fuel Cells (POF2-123)},
      pid          = {G:(DE-HGF)POF2-123},
      typ          = {PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/133849},
}