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@ARTICLE{Kalfhaus:861218,
      author       = {Kalfhaus, T. and Schneider, M. and Ruttert, B. and Sebold,
                      D. and Hammerschmidt, T. and Frenzel, J. and Drautz, R. and
                      Theisen, W. and Eggeler, G. and Guillon, O. and Vassen, R.},
      title        = {{R}epair of {N}i-based single-crystal superalloys using
                      vacuum plasma spray},
      journal      = {Materials and design},
      volume       = {168},
      issn         = {0264-1275},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2019-01739},
      pages        = {107656 -},
      year         = {2019},
      abstract     = {Turbine blades in aviation engines and land based
                      gas-turbines are exposed to extreme environments. They
                      suffer damage accumulation associated with creep, oxidation
                      and fatigue loading. Therefore, advanced repair methods are
                      of special interest for the gas-turbine industry. In this
                      study, CMSX-4 powder is sprayed by Vacuum Plasma Spray (VPS)
                      on single-crystalline substrates with similar compositions.
                      The influence of the substrate temperature is investigated
                      altering the temperature of the heating stage between
                      850 °C to 1000 °C. Different spray parameters were
                      explored to identify their influence on the microstructure.
                      Hot isostatic pressing (HIP) featuring fast quenching rates
                      was used to minimize porosity and to allow for well-defined
                      heat-treatments of the coatings. The microstructure was
                      analysed by orientation imaging scanning electron microscopy
                      (SEM), using electron backscatter diffraction (EBSD). The
                      effects of different processing parameters were analysed
                      regarding their influence on porosity and grain size. The
                      results show that optimized HIP heat-treatments can lead to
                      dense coatings with optimum γ/γ′ microstructure. The
                      interface between the coating and the substrate is oxide
                      free and shows good mechanical integrity. The formation of
                      fine crystalline regions as a result of fast cooling was
                      observed at the single-crystal surface, which resulted in
                      grain growth during heat-treatment in orientations
                      determined by the crystallography of the substrate.},
      cin          = {IEK-1 / JARA-ENERGY},
      ddc          = {690},
      cid          = {I:(DE-Juel1)IEK-1-20101013 / $I:(DE-82)080011_20140620$},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113)},
      pid          = {G:(DE-HGF)POF3-113},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000460664500014},
      doi          = {10.1016/j.matdes.2019.107656},
      url          = {https://juser.fz-juelich.de/record/861218},
}