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Laser metal deposition and selective laser melting of Fe–28 at.% Al

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Abstract

The iron aluminide Fe3Al has been successfully processed by selective laser melting (SLM) and laser metal deposition (LMD). Process parameters have been determined by which defect free and dense (>99.5%) samples were produced. However, due to the low thermal conductivity of Fe3Al, preheating the substrate to 200 °C was necessary to prevent cracking during cooling. Microstructural characterization by electron backscatter diffraction (EBSD) showed that in spite of the high cooling rates large elongated grains grew in the building direction, more distinctive for SLM than for LMD. These grains show a continuous change in the crystallographic orientation. Evaluation of the compressive flow stress showed that the anisotropic microstructure results in anisotropic mechanical properties, depending whether the samples are loaded in building direction or perpendicular to it. The alloy shows a very high strength up to 600 °C and–concerning the coarse microstructure–becomes ductile already at low temperatures.

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ACKNOWLEDGMENTS

The authors would like to thank Mr. G. Bialkowski for EDM preparation of the samples and for performing the compression tests, Mr. B. Breitbach for XRD analysis, Mrs. I. Wossack for EPMA, Mr. D. Kurz for wet chemical analysis and Dr. F. Stein for DTA analysis. Powders used for this work were supplied by NANOVAL GmbH & Co. KG. Financial support from the German Ministry of Education and Research (BMBF) under grants 03X3574E/F is gratefully acknowledged.

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Authors and Affiliations

  1. Additive Manufacturing and Functional Layers, Fraunhofer Institute for Laser Technology ILT, Aachen, 52074, Germany

    Gesa Rolink, Sabrina Vogt & Andreas Weisheit

  2. Structure and Nano-/Micromechanics of Materials, Max-Planck-Institut für Eisenforschung GmbH MPIE, Düsseldorf, 40237, Germany

    Lucia Senčekova & Martin Palm

  3. Chair for Laser Technology, RWTH Aachen, Aachen, 52074, Germany

    Reinhart Poprawe

Authors
  1. Sabrina Vogt
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  2. Lucia Senčekova
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  3. Andreas Weisheit
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  4. Reinhart Poprawe
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  5. Martin Palm
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Correspondence to Gesa Rolink.

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Rolink, G., Vogt, S., Senčekova, L. et al. Laser metal deposition and selective laser melting of Fe–28 at.% Al. Journal of Materials Research 29, 2036–2043 (2014). https://doi.org/10.1557/jmr.2014.131

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  • DOI: https://doi.org/10.1557/jmr.2014.131

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