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Serrano Munoz, Itziar [Author]; Mishurova, Tatiana [Author]; Thiede, Tobias [Author]; Sprengel, Maximilian [Author]; Kromm, Arne [Author]; Nadammal, Naresh [Author]; Nolze, Gert [Author]; Saliwan Neumann, Romeo [Author]; Evans, Alexander [Author]; Bruno, Giovanni [Author]

The residual stress in as‑built Laser Powder Bed Fusion IN718 alloy as a consequence of the scanning strategy induced microstructure

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  • Media type: E-Article
  • Title: The residual stress in as‑built Laser Powder Bed Fusion IN718 alloy as a consequence of the scanning strategy induced microstructure
  • Contributor: Serrano Munoz, Itziar [Author]; Mishurova, Tatiana [Author]; Thiede, Tobias [Author]; Sprengel, Maximilian [Author]; Kromm, Arne [Author]; Nadammal, Naresh [Author]; Nolze, Gert [Author]; Saliwan Neumann, Romeo [Author]; Evans, Alexander [Author]; Bruno, Giovanni [Author]
  • imprint: BAM-Publica - Publikationsserver der Bundesanstalt für Materialforschung und -prüfung (BAM), 2020
  • Language: English
  • DOI: https://doi.org/10.1038/s41598-020-71112-9
  • Origination:
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  • Description: The effect of two types of scanning strategies on the grain structure and build-up of Residual Stress (RS) has been investigated in an as-built IN718 alloy produced by Laser Powder Bed Fusion (LPBF). The RS state has been investigated by X-ray diffraction techniques. The microstructural characterization was performed principally by Electron Backscatter Diffraction (EBSD), where the application of a post-measurement refinement technique enables small misorientations (< 2°) to be resolved. Kernel average misorientation (KAM) distributions indicate that preferably oriented columnar grains contain higher levels of misorientation, when compared to elongated grains with lower texture. The KAM distributions combined with X-ray diffraction stress maps infer that the increased misorientation is induced via plastic deformation driven by the thermal stresses, acting to self-relieve stress. The possibility of obtaining lower RS states in the build direction as a consequence of the influence of the microstructure should be considered when envisaging scanning strategies aimed at the mitigation of RS.
  • Access State: Open Access