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@PHDTHESIS{Witzel:463044,
      author       = {Witzel, Johannes},
      othercontributors = {Poprawe, Reinhard and Reisgen, Uwe},
      title        = {{Q}ualifizierung des {L}aserstrahl-{A}uftragschweißens zur
                      generativen {F}ertigung von {L}uftfahrtkomponenten},
      school       = {Zugl.: Aachen, Techn. Hochsch.},
      type         = {Dissertation},
      address      = {Aachen},
      publisher    = {Shaker},
      reportid     = {RWTH-2015-00837},
      isbn         = {978-3-8440-3470-7},
      series       = {Berichte aus der Lasertechnik},
      pages        = {XII, 109, XXXIV S. : Ill., graph. Darst.},
      year         = {2015},
      note         = {Auch veröffentlicht auf dem Publikationsserver der RWTH
                      Aachen University.; Zugl.: Aachen, Techn. Hochsch., Diss.,
                      2014},
      abstract     = {The continued drive for increased efficiency, design
                      complexity and reduced costs, especially in the area of jet
                      engine components, demands the use of highly flexible and
                      innovative production technologies such as Additive
                      Manufacturing (AM). The high cost to manufacture a Blade
                      Integrated Disk (BLISK) used in jet engines is a primary
                      factor creating a growing need for advanced production
                      procedures, a need which addresses the problem of
                      insufficient productivity of AM processes. In the present
                      work I have developed procedural fundamentals to
                      significantly increase the productivity for Laser Metal
                      Deposition (LMD) focusing on powder additive material and
                      the nickel-base super alloy Inconel 718. This work considers
                      three aspects that have an impact on productivity: the
                      build-up rate (short process time), the quality of the
                      deposit (high reliability and less scrap) and a near-net
                      shape build-up (less post machining). High deposition rates
                      require a precise adjustment of the energy intensity in the
                      laser beam spot and, thus, controlled solidification
                      conditions in order to prevent defects such as pores,
                      bonding defects or segregations that can accumulate and form
                      hot cracks. Increased quality of the deposited material
                      requires a material model capable of describing the
                      interdependency of mechanical properties and microstructure
                      of the deposited material. And finally, near-net shape
                      build-up demands an innovative method that is capable of
                      varying the track width during the LMD process. Within the
                      present work, a jet engine component (blade integrated disk,
                      BLISK) is additively manufactured using the LMD process and
                      utilizing high build-up rates as well as a NC-controlled
                      zoom optics.},
      cin          = {418710},
      ddc          = {620},
      cid          = {$I:(DE-82)418710_20140620$},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      urn          = {urn:nbn:de:hbz:82-rwth-2015-008378},
      url          = {https://publications.rwth-aachen.de/record/463044},
}