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Heat Treatments and Critical Quenching Rates in Additively Manufactured Al–Si–Mg Alloys

Leonhard Hitzler, Stephan Hafenstein

2020enadditive manufacturingaluminum alloysheat treatmentlaser processingmicrostructure

Abstract

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Laser powder-bed fusion (LPBF) has significantly gained in importance and has become one of the major fabrication techniques within metal additive manufacturing. The fast cooling rates achieved in LPBF due to a relatively small melt pool on a much larger component or substrate, acting as heat sink, result in fine-grained microstructures and high oversaturation of alloying elements in the α-aluminum. Al–Si–Mg alloys thus can be effectively precipitation hardened. Moreover, the solidified material undergoes an intrinsic heat treatment, whilst the layers above are irradiated and the elevated temperature in the built chamber starts the clustering process of alloying elements directly after a scan track is fabricated. These silicon–magnesium clusters were observed with atom probe tomography in as-built samples. Similar beneficial clustering behavior at higher temperatures is known from the direct-aging approach in cast samples, whereby the artificial aging is performed immediately after solution annealing and quenching. Transferring this approach to LPBF samples as a possible post-heat treatment revealed that even after direct aging, the outstanding hardness of the as-built condition could, at best, be met, but for most instances it was significantly lower.

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Cite This Work

@article{6fcd4631-64e7-4339-a893-9de9a9daed0c,
  title={Heat Treatments and Critical Quenching Rates in Additively Manufactured Al–Si–Mg Alloys},
  author={Leonhard Hitzler and Stephan Hafenstein},
  year={2020},
  language={en}
}
TY  - JOUR
TI  - Heat Treatments and Critical Quenching Rates in Additively Manufactured Al–Si–Mg Alloys
AU  - Leonhard Hitzler
AU  - Stephan Hafenstein
PY  - 2020
LA  - en
ER  -

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