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Microstructural Features Controlling the Variability in Low-Cycle Fatigue Properties of Alloy Inconel 718DA at Intermediate Temperature

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Abstract

The low-cycle fatigue behavior of two direct-aged versions of the nickel-based superalloy Inconel 718 (IN718DA) was examined in the low-strain amplitude regime at intermediate temperature. High variability in fatigue life was observed, and abnormally short lifetimes were systematically observed to be due to crack initiation at (sub)-surface non-metallic inclusions. However, crack initiation within (sub)-surface non-metallic inclusions did not necessarily lead to short fatigue life. The macro- to micro-mechanical mechanisms of deformation and damage have been examined by means of detailed microstructural characterization, tensile and fatigue mechanical tests, and in situ tensile testing. The initial stages of crack micro-propagation from cracked non-metallic particles into the surrounding metallic matrix occupies a large fraction of the fatigue life and requires extensive local plastic straining in the matrix adjacent to the cracked inclusions. Differences in microstructure that influence local plastic straining, i.e., the δ-phase content and the grain size, coupled with the presence of non-metallic inclusions at the high end of the size distribution contribute strongly to the fatigue life variability.

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Acknowledgments

The authors are particularly grateful to Snecma-SAFRAN group for providing the material and for financial support. The authors would like to thank Anne-Laure Gorge, engineer in the Department of Physics and Mechanics of Materials Department at the Institut Pprime, for fruitful discussions and technical help in conducting several experiments.

Author information

Author notes

  1. Damien Texier (Postdoctoral Fellow)

    Present address: Mechanical Engineering Department, Ecole de Technologie Supérieure, 1100 Rue Notre-Dame Ouest, Montreal, QC, H3C 1K3, Canada

  2. Ana Casanova Gómez (PhD Student)

    Present address: Department of Materials Science and Metallurgy, University of Cambridge, 27 Charles Babbage Road, Cambridge, CB3 0FS, UK

Authors and Affiliations

  1. Institut Pprime - UPR CNRS 3346 - ISAE-ENSMA, Téléport 2, 1 avenue Clément Ader, BP 40109, 86961, Futuroscope-Chasseneuil Cedex, France

    Damien Texier (Postdoctoral Fellow), Ana Casanova Gómez (PhD Student), Patrick Villechaise (Director of Research (French National Centre for Scientific Research) & Jonathan Cormier (Associate Professor)

  2. Materials Department, University of California Santa Barbara, Santa Barbara, CA, 93106, USA

    Damien Texier (Postdoctoral Fellow) & Tresa M. Pollock (ALCOA Professor of Materials)

  3. Mechanics of Materials, Snecma – SAFRAN Group, Site de Villaroche, Rond-Point René Ravaud, 77550, Moissy-Cramayel, France

    Stéphane Pierret (Engineer)

  4. Materials & Process, Safran SA, SafranTech, SAFRAN Center of R&T, 78114, Magny-les-Hameaux, France

    Jean-Michel Franchet (Engineer)

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  1. Damien Texier
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  2. Ana Casanova Gómez
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  3. Stéphane Pierret
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Correspondence to Damien Texier or Jonathan Cormier.

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Manuscript submitted July 27, 2015.

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Texier, D., Gómez, A.C., Pierret, S. et al. Microstructural Features Controlling the Variability in Low-Cycle Fatigue Properties of Alloy Inconel 718DA at Intermediate Temperature. Metall Mater Trans A 47, 1096–1109 (2016). https://doi.org/10.1007/s11661-015-3291-8

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  • DOI: https://doi.org/10.1007/s11661-015-3291-8

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