PSI - Issue 23

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Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Structural Integrity Procedia 00 (2019) 000 – 000

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Procedia Structural Integrity 23 (2019) 33–38

© 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers © 201 9 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. Seconda y rec cled Al alloys are in the focus of industry bec use they possess a tremendous potenti l for cost and energy savings. However, they are inevitably contaminated with a certain amount of iron fro whi h several ria ts of brittle inte metallic inclusions are formed. Tensile and fatigue t sts w re performed with specimens contai in v ryi g amounts of iron, and subseque t h gh resolution CT-analysis was performed in order to iden ify critical defect configur tions. It was ound that ther is cert in critical am unt of iron, b l w whi h the tensile strengt and the ductility are aff cted in a minor way, if an approp iate he t treatm nt is perf rmed. High resolution computer tomography show th t this is r lated to t fact that the most da g rous platelet- like ß -inclusions are partly dissolved in the heat treatment process. Fatigue strength, on the other hand, is influenced by two effects: First, the porosity is increases with increas ng iron content, as the iron-plat let are formed at highe temperatures and hinder ma rial flow in the c sting process. Second, iron inclusions can be found in the casting skin and act as crack initiators, if the iron content exceeds a certain level. © 201 9 The Authors. Published by Elsevier B.V. This is an open access article under h CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 9th International Conference on Materials Structure and Micromechanics of Fracture On the role of Fe-content on the damage behavior of an Al-Si-Cu alloy I. Bacaicoa 1 , M. Luetje 1 , F. Zeismann 1 , A. Geisert 2 , M. Fehlbier 2 , A. Brueckner-Foit 1 * 9th International Conference on Materials Structure and Micromechanics of Fracture On the role of Fe-content on the damage behavior of an Al-Si-Cu alloy I. Bacaicoa 1 , M. Luetje 1 , F. Zeismann 1 , A. Geisert 2 , M. Fehlbier 2 , A. Brueckner-Foit 1 * 1 Institute for Materials E gineering, University of Kassel, Moenchebe g tr. 25 2Chair of Foundry Technology, University of Kassel, Kurt-Wolters-Strasse 3, D-34109, Kassel, Germany 1 Institute for Materials Engineering, University of Kassel, Moenchebergstr. 3, D-34125, Kassel, Germany 2Chair of Foundry Technology, University of Kassel, Kurt-Wolters-Strasse 3, D-34109, Kassel, Germany Abstract Abstract Secondary recycled Al alloys are in the focus of industry because they possess a tremendous potential for cost and energy savings. However, they are inevitably contaminated with a certain amount of iron from which several variants of brittle intermetallic inclusions are formed. Tensile and fatigue tests were performed with specimens containing varying amounts of iron, and subsequent high resolution CT-analysis was performed in order to identify critical defect configurations. It was found that there is a certain critical amount of iron, below which the tensile strength and the ductility are affected in a minor way, if an appropriate heat treatment is performed. High resolution computer tomography shows that this is related to the fact that the most dangerous platelet- like ß -inclusions are partly dissolved in the heat treatment process. Fatigue strength, on the other hand, is influenced by two effects: First, the porosity is increases with increasing iron content, as the iron-platelets are formed at higher temperatures and hinder material flow in the casting process. Second, iron inclusions can be found in the casting skin and act as crack initiators, if the iron content exceeds a certain level.

Keywords: Al-Si-Cu; Fe-content; damage; fatigue Keywords: Al-Si-Cu; Fe-content; damage; fatigue

* Corresponding author. Tel.: +49-561-804-3680; fax: +49-561-804-3650. E-mail address: a.brueckner-foit@uni-kassel.de * Correspon ing author. Tel.: +49-561-804-3680; fax: +49-561-804-3650. E-mail address: a.brueckner-foit@uni-kassel.de

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the IC MSMF organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an ope acces article under CC BY-NC-ND lic nse (http://creativecommon org/licenses/by-nc-nd/4.0/)

Peer-review under responsibility of the scientific committee of the IC MSMF organizers.

2452-3216 © 2019 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of the scientific committee of the ICMSMF organizers 10.1016/j.prostr.2020.01.059