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TMS 2020 149th Annual Meeting & Exhibition Supplemental Proceedings pp 341–351Cite as

Critical Quenching Rates After Solution Annealing: Peculiarities of Aluminum–Silicon Alloys Fabricated by Laser Powder-Bed Fusion

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Part of the book series: The Minerals, Metals & Materials Series ((MMMS))

Abstract

Hot isostatic pressing is commonly used to reduce the porosity of (sand-)cast age-hardenable Al-alloys in order to meet the high quality requirements defined by aircraft and automotive industries. In order to establish additive manufacturing methods, such as laser powder-bed fusion (L-PBF), hot isostatic pressing can be utilized to reduce the anisotropic mechanical properties in as-built condition and at the same time eliminate porosity. For the cast aluminum alloy A356, a gas pressure of 75 MPa during hot isostatic pressing lowers the critical cooling rate required to achieve an oversaturated solid solution to about 1 K/s, which is significantly lower than the required quenchingrate at atmospheric pressure (2–4 K/s). Thus, an oversaturated state of dissolved magnesium and silicon atoms within the aluminum matrix of cast alloys can easily be achieved in modern hot isostatic presses, thereby avoiding the necessity of a separate solution annealing step. In this work, we applied hot isostatic pressing followed by rapid quenching and direct aging to age-hardenable aluminum alloys processed by both sand casting and laser powder-bed fusion. It was shown that the proposed process of direct aging could be utilized for post-heat treatment of additively manufactured age-hardenable aluminum alloys to open up new fields of applications, for which components have to possess a high fatigue resistance.

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Authors and Affiliations

  1. TUM Department of Mechanical Engineering, Institute of Materials Science and Mechanics of Materials, Technical University of Munich, Garching bei München, Germany

    S. Hafenstein, L. Hitzler & E. Werner

  2. Faculty of Mechanical Engineering, Esslingen University of Applied Sciences, Esslingen, Germany

    E. Sert & A. Öchsner

  3. Faculty of Mechanical Engineering and Materials Science, Aalen University of Applied Sciences, Aalen, Germany

    M. Merkel

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  1. S. Hafenstein
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  2. L. Hitzler
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  4. A. Öchsner
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  5. M. Merkel
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  6. E. Werner
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Correspondence to L. Hitzler .

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    Hafenstein, S., Hitzler, L., Sert, E., Öchsner, A., Merkel, M., Werner, E. (2020). Critical Quenching Rates After Solution Annealing: Peculiarities of Aluminum–Silicon Alloys Fabricated by Laser Powder-Bed Fusion. In: TMS 2020 149th Annual Meeting & Exhibition Supplemental Proceedings. The Minerals, Metals & Materials Series. Springer, Cham. https://doi.org/10.1007/978-3-030-36296-6_32

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