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@PHDTHESIS{Fan:792517,
      author       = {Fan, Xiuru},
      othercontributors = {Schwaiger, Ruth and Krupp, Ulrich},
      title        = {{O}ptimization of laves phase strengthened high performance
                      ferritic stainless steels},
      school       = {Rheinisch-Westfälische Technische Hochschule Aachen},
      type         = {Dissertation},
      address      = {Aachen},
      reportid     = {RWTH-2020-06177},
      pages        = {1 Online-Ressource (IX, 143 Seiten) : Illustrationen,
                      Diagramme},
      year         = {2020},
      note         = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
                      University; Dissertation, Rheinisch-Westfälische Technische
                      Hochschule Aachen, 2020},
      abstract     = {This research aims at the development and optimization of
                      High Performance Fully Ferritic (HiperFer) stainless steel.
                      HiperFer steels were designed for the application in the
                      next generation of ultra-supercritical thermal power
                      conversion systems, with the steam working atmosphere at
                      high temperature. Optimization of the newly designed
                      HiperFer alloys via chemical composition adjustment and
                      thermal / thermomechanical processing was investigated，
                      and potential practical applications of HiperFer alloy were
                      discussed. Microstructure and mechanical properties of
                      HiperFer steels are highly influenced by alloying
                      composition and thermal / thermomechanical treatment. In
                      addition, the thermomechanical treatment window of HiperFer
                      alloys is influenced by the chemical composition.
                      Thermomechanical treatment including thermal and combined
                      thermal - mechanical treatment is an advanced approach to
                      optimize the properties of this type of steels.
                      Recrystallization, precipitation treatment and mechanical
                      deformation during the forming process highly influence the
                      microstructure of HiperFer and thus the resulting mechanical
                      properties. The interrelations between chemical composition
                      and the resulting thermomechanical treatment windows are
                      complex. For this reason, particle nucleation and growth,
                      size and density of particles, as well as the influence of
                      different chemical compositions on the thermomechanical
                      treatment window were investigated. To widen the scope of
                      potential practical applications of HiperFer, further
                      adjustments of chemical composition were implemented. The
                      impact of changes in thermomechanical treatment parameters
                      on microstructure and mechanical properties was investigated
                      in detail, by thermomechanical treatment simulation in
                      laboratory scale and accompanying microstructure
                      characterization on various length scales. This provided a
                      systemic view of the impact of different treatment
                      parameters on microstructure evolution and mechanical
                      properties. Furthermore, the impact of alloying elements in
                      interrelation with processing parameters was analyzed, and
                      finally the influence of chemical composition on the
                      resulting thermomechanical processing window was
                      investigated. The results contribute to optimization of the
                      HiperFer steels in various instances: First, modified
                      alloying compositions have been derived to increase
                      mechanical strength, which provide a broader range of
                      potential applications; Second, process parameters can now
                      be estimated based on the chemical composition, which saves
                      a large amount of experimental work and supports the
                      transfer to industrial processing; Third, combining
                      thermodynamics and processing recursive optimization of both
                      composition and processing according to desired mechanical
                      properties will become possible by implementing the
                      experimental data from this research into modelling tools.},
      cin          = {522110 / 520000},
      ddc          = {620},
      cid          = {$I:(DE-82)522110_20180901$ / $I:(DE-82)520000_20140620$},
      typ          = {PUB:(DE-HGF)11},
      doi          = {10.18154/RWTH-2020-06177},
      url          = {https://publications.rwth-aachen.de/record/792517},
}