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Intergranular oxidation of Ni-base alloy 718 with a focus on additive manufacturing

Sanviemvongsak, Tom and Monceau, Daniel and Desgranges, Clara and Macquaire, Bruno Intergranular oxidation of Ni-base alloy 718 with a focus on additive manufacturing. (2020) Corrosion Science, 170. 108684-108699. ISSN 0010-938X

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Official URL: https://doi.org/10.1016/j.corsci.2020.108684

Abstract

The intergranular oxidation in air at 850 °C of alloy 718 produced by laser beam melting and electron beam melting was compared to that of the wrought alloy. Quantitative analyses revealed that the amount of grain boundary oxidation was similar for these alloys. However, the additively manufactured ones presented deeper and thicker oxides at grain boundaries, due to grain size heterogeneity and to a smaller number of special boundaries. Results show that intergranular oxidation kinetics follows Wagner’s theory on internal oxidation considering not only O diffusion at the intergranular oxide/metal interfaces but also Al and Ti diffusion in the bulk.

Item Type:Article
HAL Id:hal-03033081
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
Other partners > SAFRAN (FRANCE)
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Deposited On:09 Oct 2020 09:17

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