Corrosion Behavior of Heat-Treated AlSi10Mg Manufactured by Laser Powder Bed Fusion
by
Marina Cabrini 1,2,*
, Flaviana Calignano 3, Paolo Fino 4,5, Sergio Lorenzi 1,2, Massimo Lorusso 5, Diego Manfredi 5, Cristian Testa 1,2 and Tommaso Pastore 1,2
, Flaviana Calignano 3, Paolo Fino 4,5, Sergio Lorenzi 1,2, Massimo Lorusso 5, Diego Manfredi 5, Cristian Testa 1,2 and Tommaso Pastore 1,2
1
Department of Engineering and Applied Sciences, University of Bergamo, 24044 Dalmine, Italy
2
INSTM Unità di Ricerca Bergamo, Dalmine, 24044, Italy
3
Department of Management and Production Engineering, Politecnico di Torino, 10129 Torino, Italy
4
Department of Applied Science and Technology, Politecnico di Torino, 10129 Torino, Italy
5
Center for Sustainable Future Technologies [email protected], Istituto Italiano di Tecnologia (IIT), 10129 Torino, Italy
*
Author to whom correspondence should be addressed.
Materials 2018, 11(7), 1051; https://doi.org/10.3390/ma11071051
Received: 24 April 2018 / Revised: 13 June 2018 / Accepted: 13 June 2018 / Published: 21 June 2018
(This article belongs to the Special Issue Laser Materials Processing)
This experimental work is aimed at studying the effect of microstructural modifications induced by post-processing heat treatments on the corrosion behavior of silicon-aluminum alloys produced by means of laser powder bed fusion (LPBF). The manufacturing technique leads to microstructures characterized by the presence of melt pools, which are quite different compared to casting alloys. In this study, the behavior of an AlSi10Mg alloy was evaluated by means of intergranular corrosion tests according to ISO 11846 standard on heat-treated samples ranging from 200 to 500 °C as well as on untreated samples. We found that temperatures above 200 °C reduced microhardness of the alloy, and different corrosion morphologies occurred due to the modification of both size and distribution of silicon precipitates. Selective penetrating attacks occurred at melt pool borders. The intergranular corrosion phenomena were less intense for as-produced specimens without heat treatments compared to the heat-treated specimens at 200 and 300 °C. General corrosion morphologies were noticed for specimens heat treated at temperatures exceeding 400 °C.
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Keywords:
additive manufacturing; Laser Powder Bed Fusion; intergranular corrosion; heat treatments; AlSi10Mg
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MDPI and ACS Style
Cabrini, M.; Calignano, F.; Fino, P.; Lorenzi, S.; Lorusso, M.; Manfredi, D.; Testa, C.; Pastore, T. Corrosion Behavior of Heat-Treated AlSi10Mg Manufactured by Laser Powder Bed Fusion. Materials 2018, 11, 1051.
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