PSI - Issue 33

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2021) 000–000

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ScienceDirect

Procedia Structural Integrity 33 (2021) 189–197

26th International Conference on Fracture and Structural Integrity Influence of aluminum casting alloys chemical composition on the interaction with a 304L stainless steel insert

Paolo Ferro a *, Alberto Fabrizi a , Franco Bonollo a , Filippo Berto b a University of Padova, Department of Engineering and Management, Stradella S. Nicola 3, 36100, Vicenza, Italy b NTNU, Department of Engineering Design and Materials, Richard Birkelands vei 2b, 7491, Trondheim, Norway

© 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the IGF ExCo Abstract The microstructure and mechanical properties of specimens made out of two different aluminum casting alloys, AlSi7Mg and AlSi9Cu, reinforced with a stainless-steel AISI 304 wire mesh and obtained by gravity casting were investigated. Specimens were observed by optical and scanning electron microscope in both as-cast and solution heat treated conditions with the aim to investigate the effect of matrix chemical compositions on the steel-matrix bonding. No intermetallic phases were observed at the interface in the as-cast conditions. However, a higher fraction of lack-of-filling defects as well as lack-of-bonding areas were detected in the AlSi7Mg alloy. The solution heat treatment induced the precipitation of different thick and brittle intermetallic layers, which compositions depend on aluminum alloy, in the areas where a metallurgical bonding formed during casting. Despite a little improvement of the elongation at fracture induced by silicon particle spheroidization caused by the heat treatment, the brittle fracture at the interface during tensile tests didn’t allow the reinforcement to work in both the aluminum matrixes. Finally, basing on the obtained results, improvements are suggested that take into account both the preconditioning of the reinforcement surface and its geometry. © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo Keywords: Al/Fe bimetallic castings; interface; intermetallic compounds; microstructure; mechanical properties

* Corresponding author. Tel.: +39 0444 998743; fax: +39 0444 998888. E-mail address: paolo.ferro@unipd.it

2452-3216 © 2021 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo

2452-3216 © 2021 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the IGF ExCo 10.1016/j.prostr.2021.10.023