Journal Published Online: 10 May 2018
Volume 7, Issue 4

Residual Stress in Selective Laser Melted Inconel 718: Influence of the Removal from Base Plate and Deposition Hatch Length

CODEN: MPCACD

Abstract

The residual stress distribution in IN718 elongated prisms produced by selective laser melting was studied by means of neutron (bulk) and laboratory X-ray (surface) diffraction. Two deposition hatch lengths were considered. A horizontal plane near the top surface (perpendicular to the building direction) and a vertical plane near the lateral surface (parallel to the building direction) were investigated. Samples both in as-built (AB) condition and removed from the base plate (RE) were characterized. While surface stress fields seem constant for the AB condition, X-ray diffraction shows stress gradients along the hatch direction in the RE condition. The stress profiles correlate with the distortion maps obtained by tactile probe measurements. Neutron diffraction shows bulk stress gradients for all principal components along the main sample directions. We correlate the observed stress patterns with the hatch length, i.e., with its effect on temperature gradients and heat flow. The bulk stress gradients partially disappear after removal from the base plate.

Author Information

Thiede, Tobias
Bundesanstalt für Materialforschung und –prüfung (BAM), Berlin, Germany
Cabeza, Sandra
Bundesanstalt für Materialforschung und –prüfung (BAM), Berlin, Germany Institut Laue-Langevin, Grenoble, France
Mishurova, Tatiana
Bundesanstalt für Materialforschung und –prüfung (BAM), Berlin, Germany
Nadammal, Naresh
Bundesanstalt für Materialforschung und –prüfung (BAM), Berlin, Germany
Kromm, Arne
Bundesanstalt für Materialforschung und –prüfung (BAM), Berlin, Germany
Bode, Johannes
Bundesanstalt für Materialforschung und –prüfung (BAM), Berlin, Germany
Haberland, Christoph
Siemens AG, Power and Gas, Berlin, Germany
Bruno, Giovanni
Bundesanstalt für Materialforschung und –prüfung (BAM), Berlin, Germany University of Potsdam, Institute of Physics and Astronomy, Potsdam, Germany
Pages: 19
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Stock #: MPC20170119
ISSN: 2379-1365
DOI: 10.1520/MPC20170119