OATAO - Open Archive Toulouse Archive Ouverte Open Access Week

Multiaxial fatigue analysis of a high performance Nickel-based superalloy

Selva, Pierre and Lorrain, Bernard and Alexis, Joël and Seror, Alexandre and Longuet, Arnaud and Mary, Clément and Denard, Fabrice Multiaxial fatigue analysis of a high performance Nickel-based superalloy. (2015) International Journal of Chemical, Molecular, Nuclear, Materials and Metallurgical Engineering, 9 (4). 544-549.

[img]
Preview
(Document in English)

PDF (Author's version) - Requires a PDF viewer such as GSview, Xpdf or Adobe Acrobat Reader
3MB

Abstract

Abstract—Over the past four decades, the fatigue behavior of nickel-based alloys has been widely studied. However, in recent years, significant advances in the fabrication process 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 so as 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. The aim of this presentation is first to provide an in-depth description of both the experimental set-up and protocol: the multiaxial testing machine, the specific design of the cruciform specimen and performances of the DIC code are introduced. Second, results for sixteen specimens related to different load ratios are presented. Crack detection, strain amplitude and number of cycles to crack initiation vs. triaxial stress ratio for each loading case are given. Third, 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
HAL Id:hal-02134675
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:Université de Toulouse > Institut National Polytechnique de Toulouse - Toulouse INP (FRANCE)
Other partners > SAFRAN (FRANCE)
Laboratory name:
Statistics:download
Deposited On:10 May 2019 10:55

Repository Staff Only: item control page