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Ad Hoc Heat Treatments for Selective Laser Melted Alsi10mg Alloy Aimed at Stress-Relieving and Enhancing Mechanical Performances

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Abstract

The response of an AlSi10Mg alloy produced by selective laser melting (SLM) to specifically designed heat treatments is explored. Thermal phenomena of the rapidly solidified material were studied by differential scanning calorimetry (DSC), and the results have been used to define specific post-processing thermal treatment temperatures. In detail, three heat treatments were studied: two innovative ones, able to selectively trigger (1) Mg2Si precipitation and (2) the rupture and spheroidization of the silicon network, and (3) a T5-like aging were applied for different times and their effects on mechanical properties were studied. The first and the second heat treatments were selected by combining DSC analysis and aging curves for the optimization of the temperature and duration. And these were more deeply investigated in terms of microstructural evolution and of residual stresses. The optimized thermal treatments for SLM-built AlSi10Mg are recommended as valid alternatives to the usually applied T6 or high-temperature stress release treatments.

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Acknowledgements

The authors would like to thank Giordano Carcano from CNR ICMATE and Simone Galli from Politecnico di Milano for their assistance and support in the experiments. The authors would like to acknowledge Accordo Quadro CNR/Regione Lombardia n. 3866 at 17/07/2015 FHfFC for financial support.

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Authors and Affiliations

  1. CNR ICMATE; National Research Council, Institute of Condensed Matter Chemistry and Technologies for Energy, Unit of Lecco, via Previati 1/e, 23900, Lecco, Italy

    J. Fiocchi, C. A. Biffi & A. Tuissi

  2. Department of Mechanical Engineering, Politecnico di Milano, via La Masa 1, 20156, Milan, Italy

    C. Colombo & L. M. Vergani

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  1. J. Fiocchi
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  2. C. A. Biffi
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  3. C. Colombo
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  4. L. M. Vergani
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  5. A. Tuissi
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Correspondence to C. A. Biffi.

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Fiocchi, J., Biffi, C.A., Colombo, C. et al. Ad Hoc Heat Treatments for Selective Laser Melted Alsi10mg Alloy Aimed at Stress-Relieving and Enhancing Mechanical Performances. JOM 72, 1118–1127 (2020). https://doi.org/10.1007/s11837-019-03973-z

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  • DOI: https://doi.org/10.1007/s11837-019-03973-z

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