Corrosion Behavior of Heat-Treated AlSi10Mg Manufactured by Laser Powder Bed Fusion
Autor: | Marina Cabrini, Flaviana Calignano, Paolo Fino, Sergio Lorenzi, Massimo Lorusso, Diego Manfredi, Cristian Testa, Tommaso Pastore |
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Jazyk: | angličtina |
Rok vydání: | 2018 |
Předmět: |
additive manufacturing
Laser Powder Bed Fusion intergranular corrosion heat treatments AlSi10Mg Technology Electrical engineering. Electronics. Nuclear engineering TK1-9971 Engineering (General). Civil engineering (General) TA1-2040 Microscopy QH201-278.5 Descriptive and experimental mechanics QC120-168.85 |
Zdroj: | Materials, Vol 11, Iss 7, p 1051 (2018) |
Druh dokumentu: | article |
ISSN: | 1996-1944 |
DOI: | 10.3390/ma11071051 |
Popis: | 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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