Hydrogen effect on dislocation nucleation in a ferritic alloy Fe-15Cr as observed per nanoindentation

Gaspard Vincent 1, 2, 3 Guillaume Kermouche 1, 2, 4 David Delafosse 1, 2, 3 Afrooz Barnoush 5
1 SMS-ENSMSE - Centre Science des Matériaux et des Structures
2 LGF-ENSMSE - Laboratoire Georges Friedel
3 MPI-ENSMSE - Département Mécanique physique et interfaces
4 PMM-ENSMSE- Département Physique et Mécanique des Matériaux
5 IPM - Department of Engineering Design and Materials
Abstract : Hydrogen effects on dislocation nucleation in polycrystalline ferritic Fe-15Cr binary alloy were investigated using in situ electrochemical nanoindentation. Linear elastic finite element calculations taking account of the cubic symmetry of BCC crystals were made to extract the resolved shear stresses on the different slip systems of the indented grains. It is shown that the resolved shear stresses corresponding to the experimentally measured pop-in loads are compatible with homogeneous dislocation nucleation. The resolved shear stress necessary to nucleate dislocations from defect-free crystals was estimated at mu/12-mu/13 without hydrogen. Cathodically charged hydrogen reduces the shear strength of the crystal by 8.5%-19.8%, thus promoting dislocation multiplication. (C) 2014 Elsevier B.V. All rights reserved.
Keywords : HYDROGEN/DEFORMATION INTERACTION DISSOLVED HYDROGEN SHEAR MODULUS FLOW-STRESS ALPHA-IRON DENSITY SINGLE-CRYSTALS ELECTROCHEMICAL NANOINDENTATION MECHANICAL-PROPERTIES HIGH-PURITY IRON Nanoindentation Dislocation nucleation Crystal anisotropy Hydrogen
Type de document :
Article dans une revue
Materials Science and Engineering: A, Elsevier, 2014, 604, pp.86-91. 〈10.1016/j.msea.2014.02.041〉
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https://hal-emse.ccsd.cnrs.fr/emse-01145530
Contributeur : Géraldine Fournier-Moulin <>
Soumis le : vendredi 24 avril 2015 - 14:53:19
Dernière modification le : mercredi 24 octobre 2018 - 01:00:50

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Gaspard Vincent, Guillaume Kermouche, David Delafosse, Afrooz Barnoush. Hydrogen effect on dislocation nucleation in a ferritic alloy Fe-15Cr as observed per nanoindentation. Materials Science and Engineering: A, Elsevier, 2014, 604, pp.86-91. 〈10.1016/j.msea.2014.02.041〉. 〈emse-01145530〉

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