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Materials 2017, 10(4), 348; doi:10.3390/ma10040348

An Assessment of Subsurface Residual Stress Analysis in SLM Ti-6Al-4V

1
Bundesanstalt für Materialforschung und-prüfung (BAM; Federal Institute for Materials Research and Testing), Unter den Eichen 87, 12205 Berlin, Germany
2
Institute of Materials Research, German Aerospace Center (DLR; Deutsches Zentrum für Luft-und Raumfahrt), Linder Höhe, 51147 Cologne, Germany
3
Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner Platz 1, 14109 Berlin, Germany
4
Institute of Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Straße 24/25, 14476 Potsdam, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: J. Paulo Davim
Received: 3 February 2017 / Revised: 17 March 2017 / Accepted: 22 March 2017 / Published: 27 March 2017
(This article belongs to the Special Issue Metals for Additive Manufacturing)
View Full-Text   |   Download PDF [5290 KB, uploaded 7 April 2017]   |  

Abstract

Ti-6Al-4V bridges were additively fabricated by selective laser melting (SLM) under different scanning speed conditions, to compare the effect of process energy density on the residual stress state. Subsurface lattice strain characterization was conducted by means of synchrotron diffraction in energy dispersive mode. High tensile strain gradients were found at the frontal surface for samples in an as-built condition. The geometry of the samples promotes increasing strains towards the pillar of the bridges. We observed that the higher the laser energy density during fabrication, the lower the lattice strains. A relief of lattice strains takes place after heat treatment. View Full-Text
Keywords: selective laser melting; additive manufacturing; heat treatment; Ti-6Al-4V; synchrotron X-ray diffraction; residual stress selective laser melting; additive manufacturing; heat treatment; Ti-6Al-4V; synchrotron X-ray diffraction; residual stress
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Mishurova, T.; Cabeza, S.; Artzt, K.; Haubrich, J.; Klaus, M.; Genzel, C.; Requena, G.; Bruno, G. An Assessment of Subsurface Residual Stress Analysis in SLM Ti-6Al-4V. Materials 2017, 10, 348.

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