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Hot isostatic pressing of laser powder bed fusion AlSi10Mg: parameter identification and mechanical properties

  • Metal Additive Manufacturing
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Abstract

The fatigue crack initiation of as built (AB) laser powder bed fusion (LPBF) AlSi10Mg is highly affected by the presence of large porosities inherent to the process. Hot isostatic pressing (HIP) is a potential means of reduction of this detrimental porosity. Classic high temperature HIP treatments at about 500 °C and 100 MPa pressure lead to significant strength loss that is partially recovered after additional solution and ageing heat treatments, i.e. overall a three-step treatment. In this work, a 350 °C HIP treatment performed under a higher pressure of 300 MPa for 2 h has been identified as a promising post-treatment for LPBF AlSi10Mg using finite element method simulations of the HIP process. This treatment is shown to suppress these large porosities and lead to higher fracture strain and total fatigue life than after the classic three-step treatment (HIP + two steps of heat treatment). Both HIP treatments also present higher fracture strain compared to the AB material. Thus, this new 350 °C HIP treatment efficiently removes the need for post-treatments after HIP. The 350 °C at 300 MPa HIP treatment improves the yield strength weighted fatigue resistance compared to the AB material but not the absolute fatigue life.

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Acknowledgements

The authors acknowledge the support of Guillaume Contzen, Azziz Hocini and Nathan Wiertz.

Funding

JGSM acknowledges the support of the Fonds de la recherche scientifique–FNRS (FRIA grant), Belgium. This research has also been funded (from January 2017) by the European research council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement n°716678). This research work has also been supported from January 2019 by the WALInnov LongLifeAM project, convention n°1810016, funded by the service public de Wallonie économie emploi recherche (SPW-EER).

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Authors and Affiliations

  1. Institute of Mechanics, Materials and Civil Engineering, IMAP, Université catholique de Louvain, 1348, Louvain la Neuve, Belgium

    Juan Guillermo Santos Macías, Grzegorz Pyka, Camille van der Rest, Laurence Ryelandt & Aude Simar

  2. Department of Mechanics, School of Aerospace Engineering, Huazhong University of Science and Technology, Wuhan, China

    Lv Zhao

  3. CNRS, UPR 3407, Laboratoire des Sciences des Procédés et des Matériaux, Université Sorbonne Paris Nord, 93430, Villetaneuse, France

    David Tingaud & Brigitte Bacroix

Authors
  1. Juan Guillermo Santos Macías
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  2. Lv Zhao
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  3. David Tingaud
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  4. Brigitte Bacroix
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  6. Camille van der Rest
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  7. Laurence Ryelandt
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  8. Aude Simar
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Correspondence to Aude Simar.

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Santos Macías, J.G., Zhao, L., Tingaud, D. et al. Hot isostatic pressing of laser powder bed fusion AlSi10Mg: parameter identification and mechanical properties. J Mater Sci 57, 9726–9740 (2022). https://doi.org/10.1007/s10853-022-07027-9

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  • DOI: https://doi.org/10.1007/s10853-022-07027-9

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