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Low cycle biaxial fatigue behavior of direct aged Nickel-based 718 superalloy

Selva, Pierre and Lorrain, Bernard and Alexis, Joël and Seror, Alexandre and Longuet, Arnaud and Mary, Caroline and Denard, Fabrice Low cycle biaxial fatigue behavior of direct aged Nickel-based 718 superalloy. (2016) International Journal of Engineering Research and Applications, 6 (3). 1-8. ISSN 2248-9622

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Official URL: http://www.ijera.com/pages/v6no3(v6).html

Abstract

In recent years, significant advances in the fabrication process of nickel-base supperalloy leading to grain size reduction have been made in order to improve fatigue properties of aircraft turbine discs. Indeed, a change in particle size affects the initiation mode of fatigue cracks as well as the fatigue life of the material. The present study aims to investigate the fatigue behavior of a newly developed nickel-based superalloy under biaxial-planar loading. Low Cycle Fatigue (LCF) tests are performed at different stress ratios to study the influence of the multiaxial stress state on the fatigue life of the material. Full-field displacement and strain measurements as well as crack initiation detection are obtained using Digital Image Correlation (DIC) techniques. Results related to different load ratios are presented and an appropriate biaxial lifetime prediction is given. Crack detection, strain amplitude and number of cycles to crack initiation vs. triaxial stress ratio for each loading case are mentionned. From fractographic investigations by scanning electron microscopy it is found that the mechanism of fatigue crack initiation does not depend on the triaxial stress ratio and that most fatigue cracks initiate from subsurface carbides.

Item Type:Article
Additional Information:Thanks to IJERA editor. The definitive version is available at http://www.ijera.com/. The original PDF of the article can be found at : http://www.ijera.com/papers/Vol6_issue3/Part%20-%206/A0603060108.pdf
HAL Id:hal-01449174
Audience (journal):International peer-reviewed journal
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Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Other partners > Société nationale d'étude et de constructions de moteurs d'avion - SNECMA (FRANCE)
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Deposited On:12 Dec 2016 13:47

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