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    Volume 7, Issue 4 (May 2018)

    Special Issue Paper

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

    (Received 28 July 2017; accepted 23 October 2017)

    Published Online: 10 May 2018

    CODEN: MPCACD

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    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,

    Cabeza, Sandra
    Bundesanstalt für Materialforschung und –prüfung (BAM), Berlin,

    Institut Laue-Langevin, Grenoble,

    Mishurova, Tatiana
    Bundesanstalt für Materialforschung und –prüfung (BAM), Berlin,

    Nadammal, Naresh
    Bundesanstalt für Materialforschung und –prüfung (BAM), Berlin,

    Kromm, Arne
    Bundesanstalt für Materialforschung und –prüfung (BAM), Berlin,

    Bode, Johannes
    Bundesanstalt für Materialforschung und –prüfung (BAM), Berlin,

    Haberland, Christoph
    Siemens AG, Power and Gas, Berlin,

    Bruno, Giovanni
    Bundesanstalt für Materialforschung und –prüfung (BAM), Berlin,

    University of Potsdam, Institute of Physics and Astronomy, Potsdam,


    Stock #: MPC20170119

    ISSN:2379-1365

    DOI: 10.1520/MPC20170119

    Author
    Title Residual Stress in Selective Laser Melted Inconel 718: Influence of the Removal from Base Plate and Deposition Hatch Length
    Symposium ,
    Committee E28