Fatigue crack growth under large scale yielding condition in a cast automotive aluminum alloy

Sébastien Dézécot 1, 2, 3 Matthieu Rambaudon 2 Alain Köster 2 Fabien Szmytka 3, 4 Vincent Maurel 2 Jean-Yves Buffiere 1
1 MATEIS - Matériaux, ingénierie et science [Villeurbanne]
2 MAT - Centre des Matériaux
3 PSA - PSA Peugeot - Citroën
4 Univ. Paris-Saclay, ENSTA ParisTech - École Nationale Supérieure de Techniques Avancées
Abstract : Low Cycle Fatigue crack growth tests have been performed at 250 °C in order to study fatigue crack growth under large scale yielding conditions in a material widely used at high temperature by the automotive industry for cylinder head applications. The studied material was a cast aluminum alloy AlSi7Cu3Mg (close to A319) produced by Lost Foam Casting. Two different microstructures were investigated: one containing large natural pores and another where pores have been removed by Hot Isostatic Pressing (HIP). Fatigue Crack Growth Rates (FCGR) have been measured by in situ surface optical microscopy for different loading conditions all inducing generalized plasticity and compared to assess the influence of pores on the FCGR. In situ observations coupled to post mortem analysis revealed strong crack interactions with both pores and large hard particles on specimen surfaces and in the bulk. FCGR ranging between and  m/cycle appear to be mainly sensitive to applied strain amplitudes. Although pores promoted secondary crack initiations and crack coalescences, they seemed to have a limited effect on steady-state FCGR which has been analytically modeled using energy densities.
Keywords : High temperature Large scale yielding Fatigue crack growth Low Cycle Fatigue Cast aluminum alloy
Type de document :
Article dans une revue
Materials Science and Engineering: A, Elsevier, 2019, 743, pp.87-97
Liste complète des métadonnées
https://hal-mines-paristech.archives-ouvertes.fr/hal-01955803
Contributeur : Odile Adam <>
Soumis le : vendredi 14 décembre 2018 - 15:59:24
Dernière modification le : vendredi 11 janvier 2019 - 15:09:05

Identifiants

  • HAL Id : hal-01955803, version 1

Collections

ENSMP | ENSMP_MAT | PARISTECH | PSL | UNIV-LYON1 | INSA-LYON | UNIV-PARIS-SACLAY | ENSTA

Citation

Sébastien Dézécot, Matthieu Rambaudon, Alain Köster, Fabien Szmytka, Vincent Maurel, et al.. Fatigue crack growth under large scale yielding condition in a cast automotive aluminum alloy. Materials Science and Engineering: A, Elsevier, 2019, 743, pp.87-97. 〈hal-01955803〉

Exporter

BibTeX TEI DC DCterms EndNote

Partager

Métriques

Consultations de la notice

39

Contact

support.ccsd.cnrs.fr
hal.support@ccsd.cnrs.fr
Logo CCSD