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Multiaxial high cycle fatigue damage mechanisms associated with the different microstructural heterogeneities of cast aluminium alloys

Mechanismes d'endommagement en fatigue multiaxiale à grand nombre de cycles associés aux différentes hétérogénéités microstructurales des alliages d'aluminium de fonderie

Type
Articles dans des revues avec comité de lecture
Author
LE, Viet Duc
164351 Institut de Mécanique et d'Ingénierie de Bordeaux [I2M]
7736 PSA Peugeot - Citroën [PSA]
206863 Laboratoire des Arts et Métiers ParisTech d'Angers - Procédés Matériaux Durabilité [LAMPA - PMD]
MOREL, Franck
109675 Laboratoire Arts et Métiers ParisTech d'Angers [LAMPA]
SAINTIER, Nicolas
164351 Institut de Mécanique et d'Ingénierie de Bordeaux [I2M]
BELLETT, Daniel
109675 Laboratoire Arts et Métiers ParisTech d'Angers [LAMPA]
OSMOND, Pierre
7736 PSA Peugeot - Citroën [PSA]

URI
http://hdl.handle.net/10985/10857
DOI
10.1016/j.msea.2015.10.026
Date
2016
Journal
Materials Science and Engineering: A

Abstract

This article is dedicated to the high cycle fatigue (HCF) behaviour of cast Al-Si alloys. In particular, three similar alloys with different microstructural characteristics are investigated. The result of an experimental campaign are presented, in order to characterise the fatigue behaviour, and more specifically the fatigue damage mechanisms related to the different microstructural heterogeneities (i.e. casting porosity, dendrite size, SDAS, non-metallic inclusions and silicon particles), observed under different multiaxial loading conditions: pure tension, plane bending, pure torsion and combined tension-torsion with a load ratio R=-1. It is shown that casting porosity has a very detrimental influence on the uniaxial and combined tension-torsion fatigue strengths. However, a much lower influence is observed for the torsional fatigue strength. For the porosity-free alloy, it is observed that the formation of persistent slip bands (PSB) in the aluminium matrix is the major fatigue crack initiation mechanism regardless of the loading modes, at a load ratio of R=-1. It is also shown that the aluminium matrix has a large role in the formation of PSB and that the Si particles facilitate the formation of PSB.

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  • Institut de Mécanique et d’Ingénierie de Bordeaux (I2M)
  • Laboratoire Angevin de Mécanique, Procédés et InnovAtion (LAMPA)

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