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Open AccessArticle

Microstructure and Selective Corrosion of Alloy 625 Obtained by Means of Laser Powder Bed Fusion

1
Consorzio INSTM, via G. Giusti, 9, 50121 Firenze, Italy
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University of Bergamo, Department of Engineering and Applied Sciences, Viale Marconi 5, 24044 Dalmine, Italy
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OMB Valves SpA, Via Europa, 7, 24069 Cenate Sotto, Italy
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Department of Applied Science and Technology, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
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Center for Sustainable Futures [email protected], Istituto Italiano di Tecnologia, Via Livorno 60, 10144 Torino, Italy
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Department of Management and Production Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Torino, Italy
*
Author to whom correspondence should be addressed.
Materials 2019, 12(11), 1742; https://doi.org/10.3390/ma12111742
Received: 8 April 2019 / Revised: 24 May 2019 / Accepted: 27 May 2019 / Published: 29 May 2019
(This article belongs to the Special Issue Corrosion and Protection of Materials)
The effect of microstructure on the susceptibility to selective corrosion of Alloy 625 produced by laser powder bed fusion (LPBF) process was investigated through intergranular corrosion tests according to ASTM G28 standard. The effect of heat treatment on selective corrosion susceptibility was also evaluated. The behavior was compared to commercial hot-worked, heat treated Grade 1 Alloy 625. The morphology of attack after boiling ferric sulfate-sulfuric acid test according to ASTM G28 standard is less penetrating for LPBF 625 alloy compared to hot-worked and heat-treated alloy both in as-built condition and after heat treatment. The different attack morphology can be ascribed to the oversaturation of the alloying elements in the nickel austenitic matrix obtained due to the very high cooling rate. On as-built specimens, a shallow selective attack of the border of the melt pools was observed, which disappeared after the heat treatment. The results confirmed similar intergranular corrosion susceptibility, but different corrosion morphologies were detected. The results are discussed in relation to the unique microstructures of LPBF manufactured alloys. View Full-Text
Keywords: additive manufacturing; corrosion; alloy 625; selective corrosion; oil and gas; materials qualification additive manufacturing; corrosion; alloy 625; selective corrosion; oil and gas; materials qualification
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MDPI and ACS Style

Cabrini, M.; Lorenzi, S.; Testa, C.; Brevi, F.; Biamino, S.; Fino, P.; Manfredi, D.; Marchese, G.; Calignano, F.; Pastore, T. Microstructure and Selective Corrosion of Alloy 625 Obtained by Means of Laser Powder Bed Fusion. Materials 2019, 12, 1742.

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