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Mechanical Properties of AlSi10Mg Processed by Laser Powder Bed Fusion at Elevated Temperature

  • Even W. HovigEmail author
  • Amin S. Azar
  • Mohammed Mhamdi
  • Knut Sørby
Conference paper
  • 420 Downloads
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

AlSi10Mg processed by laser powder bed fusion is expected to have remarkable mechanical properties due to the dominant cellular microstructure. Nevertheless, the as-processed material is known to contain significant residual stresses, as well as a textured microstructure resulting in anisotropic mechanical properties. To mitigate these problems, a retrofitted heating system was used to elevate the process temperature to 200 °C. The characterization results show low levels of porosity, anisotropy, and residual stress. Furthermore, the effect of three heat treatment conditions (as-built, stress relief, and T6) on the tensile properties was investigated. For this purpose, 14 tensile samples were built in seven different orientations. Digital image correlation was used to understand the deformation mechanism for each heat treatment condition. It was observed that the as-built material has comparable properties to the stress relieved condition, while T6 heat treatment resulted in increased ductility. Based on the results, LPBF processing of AlSi10Mg at elevated temperature can potentially eliminate the need for post-process stress relief heat treatment.

Keywords

Powder bed fusion Laser melting Additive manufacturing Residual stress Tensile properties Anisotropy Digital image correlation 

Notes

Acknowledgements

The authors acknowledge funding from the Research Council of Norway (grant no. 248243, the MKRAM project) and SINTEF’s strategic project on additive manufacturing, SIP-LAMINA.

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Copyright information

© The Minerals, Metals & Materials Society 2020

Authors and Affiliations

  • Even W. Hovig
    • 1
    Email author
  • Amin S. Azar
    • 2
  • Mohammed Mhamdi
    • 2
  • Knut Sørby
    • 1
  1. 1.Norwegian University of Science and TechnologyTrondheimNorway
  2. 2.SINTEF IndustryOsloNorway

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