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Role of Direct Aging and Solution Treatment on Hardness, Microstructure and Residual Stress of the A357 (AlSi7Mg0.6) Alloy Produced by Powder Bed Fusion

LAVINIA TONELLI, ERICA LIVERANI

2021enaluminumadditive manufacturinghardnessmicrostructureresidual stress

Abstract

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Applying additive manufacturing (AM) technologies to the fabrication of aluminum automotive components may result in improved vehicle light weighting. This study investigates the effect of different heat treatments on the microstructure, hardness, and residual stress of the A357 (AlSi7Mg0.6) heat-treatable alloy produced by laser-based powder bed fusion (LPBF). Two major issues were addressed: relieving the internal residual stress from the process and strengthening the alloy with customized heat treatments. Stress-relief annealing, direct aging of the as-built alloy, and a redesigned T6 treatment, consisting of a shortened high-temperature solution treatment followed by artificial aging, were examined. Comparable hardness values were achieved with optimized direct aging and T6 treatments, but complete relief of the residual stress was only obtained with T6. Microstructural analyses indicated that different phenomena were involved in the direct aging and T6 treatment due to the supersaturated solid solution. However, this study highlights the need for customized heat treatment protocols to effectively optimize mechanical properties in AM aluminum alloys.

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Cite This Work

@article{81d8debc-2e41-4b88-b8ec-5dc7f181ec03,
  title={Role of Direct Aging and Solution Treatment on Hardness, Microstructure and Residual Stress of the A357 (AlSi7Mg0.6) Alloy Produced by Powder Bed Fusion},
  author={LAVINIA TONELLI and ERICA LIVERANI},
  year={2021},
  language={en}
}
TY  - JOUR
TI  - Role of Direct Aging and Solution Treatment on Hardness, Microstructure and Residual Stress of the A357 (AlSi7Mg0.6) Alloy Produced by Powder Bed Fusion
AU  - LAVINIA TONELLI
AU  - ERICA LIVERANI
PY  - 2021
LA  - en
ER  -

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