Residual stress formation in selective laser melted parts of Alloy 718

  • Additive manufacturing (AM) by selective laser melting (SLM) offers ample scope for producing geometrically complex parts as compared to the traditional subtractive manufacturing strategies. However, the residual stresses which develop during the process can limit the application of SLM parts because they can reduce the load bearing capacity as well as induce unwanted distortion depending on the boundary conditions specified in manufacturing. This study aims at the characterization of residual stresses in SLM parts by using different measurement techniques. The material used is the nickel based super Alloy 718. Microstructure as well as surface and bulk residual stresses were characterised. For residual stress analysis X-ray, synchrotron and neutron diffraction were applied. The results show different residual stress states dependent on the penetration depth in the sample offered by the different measurement techniques. Samples of Alloy 718 manufactured by SLM process can show highAdditive manufacturing (AM) by selective laser melting (SLM) offers ample scope for producing geometrically complex parts as compared to the traditional subtractive manufacturing strategies. However, the residual stresses which develop during the process can limit the application of SLM parts because they can reduce the load bearing capacity as well as induce unwanted distortion depending on the boundary conditions specified in manufacturing. This study aims at the characterization of residual stresses in SLM parts by using different measurement techniques. The material used is the nickel based super Alloy 718. Microstructure as well as surface and bulk residual stresses were characterised. For residual stress analysis X-ray, synchrotron and neutron diffraction were applied. The results show different residual stress states dependent on the penetration depth in the sample offered by the different measurement techniques. Samples of Alloy 718 manufactured by SLM process can show high tensile residual stresses in the surface as high as the yield strength of the wrought alloy. Residual stresses in the bulk show considerably lower stress values.zeige mehrzeige weniger

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Metadaten
Autor*innen:Arne KrommORCiD
Koautor*innen:Sandra Cabeza, Tatiana Mishurova, Tobias Thiede, Naresh Nadammal, Giovanni Bruno, Pedro Dolabella Portella
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2017
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
Freie Schlagwörter:Additive Manufacturing; Residual stresses; Selective Laser Melting
Veranstaltung:1st International Congress on Welding, Additive Manufacturing and associated non-destructive testing - ICWAM
Veranstaltungsort:Metz, France
Beginndatum der Veranstaltung:17.05.2017
Enddatum der Veranstaltung:19.05.2017
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:24.05.2017
Referierte Publikation:Nein
Eingeladener Vortrag:Nein
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