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@PHDTHESIS{Mikulova:40411,
      author       = {Mikulova, Lena},
      title        = {{B}ruchmechanische {U}ntersuchungen an {W}erkstoffen für
                      {D}ampfkraftwerke mit {F}rischdampftemperaturen zwischen 550
                      und 650°{C}},
      volume       = {37},
      school       = {RWTH Aachen},
      type         = {Dr. (FH)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-40411},
      isbn         = {3-89336-391-2},
      series       = {Schriften des Forschungszentrums Jülich. Reihe
                      Energietechnik/Energy Technology},
      pages        = {149 S.},
      year         = {2005},
      note         = {Record converted from VDB: 12.11.2012; RWTH Aachen, Diss.,
                      2005},
      abstract     = {The higher steam temperatures and pressures in advanced
                      supercritical steam turbines require the use of steels with
                      improved creep rupture strength. The tempered martensitic
                      steel P92 is a creep resistant material used for the
                      production of components for live steam with operating
                      temperature 550-630°C. For the application of these steels
                      is essentially necessary to know the impact of different
                      test atmospheres and temperatures on the crack growth rate.
                      In the present work, the influence of atmosphere (air,
                      vacuum, simulated live steam), proof-temperature, hold time,
                      thermal exposure on the crack growth has been studied at
                      temperatures between 500 and 600°C. The influence of
                      proof-temperature and atmosphere has been reflected on
                      micrographs of fracture surface. SEM-micrographs of the
                      principal crack and also optical micrographs coming from the
                      cross sections perpendicular to the plane of a crack
                      propagation (secondary cracks) show changes in the character
                      of a crack propagation dependent of the loading cycle and
                      temperature. By fatigue crack growth tests has been
                      enhancement of crack growth due to the aggressive atmosphere
                      (air) noted. The fatigue crack growth rates in air are at
                      least one order of magnitude faster than those in vacuum
                      (inert atmosphere). The effects of air, vacuum, simulated
                      live steam on creep crack growth of P92 was also studied. A
                      hold time leads to a higher crack growth rate compared with
                      pure creep crack growth tests. The results from crack growth
                      tests demonstrated, that steam oxidation plays a important
                      role among the three factor, creep crack growth, fatigue
                      crack growth and oxidation, in crack growth of these steel
                      in superheated steam. In this work was also effect of
                      side-grooves on the local stress and crack growth rate
                      experimentally examined.},
      cin          = {IWV-2},
      ddc          = {620},
      cid          = {I:(DE-Juel1)VDB2},
      pnm          = {Werkstoffsysteme für Kraftwerke},
      pid          = {G:(DE-Juel1)FUEK248},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/40411},
}