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TEM Study of High-Temperature Precipitation of Delta Phase in Inconel 718 Alloy

Dehmas, Moukrane and Lacaze, Jacques and Niang, Aliou and Viguier, Bernard TEM Study of High-Temperature Precipitation of Delta Phase in Inconel 718 Alloy. (2011) Advances in Materials Science and Engineering , vol. 2011 (Id 940634). pp. 1-9. ISSN 1687-8434

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Official URL: http://dx.doi.org/10.1155/2011/940634

Abstract

Inconel 718 is widely used because of its ability to retain strength at up to 650◦C for long periods of time through coherent metastable γ” Ni3Nb precipitation associated with a smaller volume fraction of γ’ Ni3Al precipitates. At very long ageing times at service temperature, γ” decomposes to the stable Ni3Nb δ phase. This latter phase is also present above the γ” solvus and is used for grain control during forging of alloy 718.While most works available on δ precipitation have been performed at temperatures below the γ” solvus, it appeared of interest to also investigate the case where δ phase precipitates directly fromthe fccmatrix free of γ’’precipitates. This was studied by X-ray diffraction and transmission electron microscopy (TEM). TEM observations confirmed the presence of rotation-ordered domains in δ plates, and some unexpected contrast could be explained by double diffraction due to overlapping phases.

Item Type:Article
Additional Information:Thanks to Hindawi Publishing Corporation editor. The original version is available at http://www.hindawi.com/journals/amse/ The original PDF of the article can be found at Advances in Materials Science and Engineering website: http://www.hindawi.com/journals/amse/2011/940634/
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > Ecole Nationale Supérieure des Mines de Nancy - ENSMN (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Other partners > Université Paul-Verlaine - Metz (FRANCE)
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Deposited By:Denis Faragou

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