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Oxidation-Assisted Cracking at 650 °C in Superalloy 718 Manufactured by Laser Beam Melting: Effect of Temperature and Strain Rate

Pancou, Alexandre and Andrieu, Eric and Votié, Arnaud Oxidation-Assisted Cracking at 650 °C in Superalloy 718 Manufactured by Laser Beam Melting: Effect of Temperature and Strain Rate. (2018) In: Proceedings of the 9th International Symposium on Superalloy 718 & Derivatives: Energy, Aerospace, and Industrial Applications. (The Minerals, Metals & Materials Series book series (MMMS)). Springer International Publishing, 711-733. ISBN 978-3-319-89479-9

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Official URL: https://doi.org/10.1007/978-3-319-89480-5_47

Abstract

Additive manufacturing of complex parts in superalloy 718 by Laser Beam Melting (LBM, also referred to Selective Laser Melting, SLM) is currently under the evaluation by the aerospace industry, due to the opportunity to combine alloy 718 excellent properties and versatility of use, with the benefits and increasing maturity of LBM technology. In this work, the interactions between fracture modes and deformation modes for LBM-manufactured 718 were studied at 20, 450 and 650 °C. Vertical and horizontal tensile specimens were fabricated, then heat-treated with two sets of standard solution-aging treatments, before being tested in air over a range of strain rate from 8 × 10–5 to 3 × 10−2 s−1. Results of these tests showed evidence of a coupling effect between oxidation and mechanical loading, resulting in oxidation-assisted cracking of LBM 718 alloy for the same temperature and strain rate conditions than conventionally-manufactured alloy 718. Also, in spite of consisting of fundamentally different microstructures, relationships between fracture modes and deformation modes for laser beam melted 718 were found to be surprisingly consistent with the ones previously established for conventional 718. These results suggests that microstructure parameters such as grain size and morphology, or phase distribution are not involved at the first order in the mechanisms controlling these interactions. To further describe these phenomena, the interactions between solute elements, mobile dislocations and interfaces must be considered.

Item Type:Book Section
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > FusiA (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UT3 (FRANCE)
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Deposited On:28 Jan 2019 13:00

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