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@ARTICLE{Fritton:571004,
      author       = {Fritton, Massimo and Kümmel, Frank and Kirchmayer, Andreas
                      and Stark, Andreas and Hafez Haghighat, Masood and Gehrmann,
                      Bodo and Neumeier, Steffen and Gilles, Ralph},
      title        = {{I}nvestigation of the {H}ot {D}eformation {B}ehavior in
                      {VDM}® {A}lloy 780 by {I}n {S}itu {H}igh-{E}nergy {X}-{R}ay
                      {D}iffraction},
      journal      = {Metallurgical and materials transactions / A},
      volume       = {54},
      number       = {5},
      issn         = {0026-086x},
      address      = {Boston},
      publisher    = {Springer},
      reportid     = {PUBDB-2023-00731},
      pages        = {2037 - 2051},
      year         = {2023},
      abstract     = {Ni-based superalloys are indispensable for applications in
                      demanding environments, such as the heavily stressed
                      rotating discs in the hot sections of modern gas turbines or
                      jet engines. In this paper, the microstructure evolution
                      during hot deformation to mimic the forging process was
                      investigated in the polycrystalline VDM® Alloy 780 via in
                      situ X-ray diffraction at temperatures of 950, 1000, and
                      1050 °C. For the tested temperatures, the hot forming led
                      to subgrain formation, the built-up of a texture by rotation
                      of the matrix grains into preferred orientations, and
                      dynamic recrystallization. The influence of the deformation
                      was analyzed depending on the direction of the lattice plane
                      normals to the load direction, for the first five
                      γ-reflections in the diffraction pattern. During uniaxial
                      compressive deformation intensity, maxima develop in the
                      loading direction solely for the γ-(220) reflections, while
                      intensity minima develop for the other reflections which
                      correspond to the formation of a <110> fiber texture. In
                      the transverse direction, all γ-reflections except the
                      (220) have an increased intensity at the maximum specimen
                      strain of 20 pct. Directly after the hot forming, three
                      different cooling rates of 10, 100, and 1000 °C/min and
                      their influence on the microstructure were investigated. The
                      fast and medium cooling rates lead to low recrystallized
                      fractions and a largely preserved deformation texture,
                      whereas the low cooling rate leads to a high recrystallized
                      fraction and a slight remaining texture. Additionally, the
                      diffraction data are complemented by electron microscopy
                      measurements.},
      month         = {Sep},
      date          = {2022-09-19},
      organization  = {4th European Symposium on Superalloys
                       and their Applications, Bamberg
                       (Germany), 19 Sep 2022 - 22 Sep 2022},
      cin          = {DOOR ; HAS-User / TUM / Hereon},
      ddc          = {530},
      cid          = {I:(DE-H253)HAS-User-20120731 / I:(DE-588b)36241-4 /
                      I:(DE-H253)Hereon-20210428},
      pnm          = {6G3 - PETRA III (DESY) (POF4-6G3)},
      pid          = {G:(DE-HGF)POF4-6G3},
      experiment   = {EXP:(DE-H253)P-P07-20150101 /
                      EXP:(DE-H253)Nanolab-03-20150101},
      typ          = {PUB:(DE-HGF)8 / PUB:(DE-HGF)16},
      UT           = {WOS:000916906000001},
      doi          = {10.1007/s11661-022-06942-5},
      url          = {https://bib-pubdb1.desy.de/record/571004},
}