Assessment of mechanical property gradients after impact-based surface treatment: application to pure alpha-iron

David Tumbajoy-Spinel 1, 2, 3 Sylvie Descartes 4 Jean-Michel Bergheau 5 Victor Lacaille 6, 5 G Guillonneau 7, 5 Johann Michler 7 Guillaume Kermouche 1, 3, 2
1 PMM-ENSMSE- Département Physique et Mécanique des Matériaux
2 SMS-ENSMSE - Centre Science des Matériaux et des Structures
3 LGF-ENSMSE - UMR 5307 - Laboratoire Georges Friedel
4 LaMCoS - Laboratoire de Mécanique des Contacts et des Structures [Villeurbanne]
5 LTDS - Laboratoire de Tribologie et Dynamique des Systèmes
6 WINOA
7 EMPA - Swiss Federal Laboratories for Materials Science and Technology [Thun]
Abstract : Mechanical surface treatments are known for their ability to improve material resistance to abrasive wear and local fatigue crack microstructure of the home-made crack propagation. These treatments are based on repeated contact loadings which create large plastic strains in the near-surface that can induce a local grain refinement. In this case, a significant increase in the near-surface local mechanical properties is thus usually observed. In this paper, nano-mechanical tests are used to quantify the mechanical property gradient in the near-surface of a purity-controlled alpha-iron after an impact-based treatment. A methodology based on the combination of two different techniques is proposed: nano-indentation and in-situ micro-pillar compression. The resulting in-depth mechanical properties gradient is compared to the average grain size measured by EBSD. A positive relationship with the well-known Hall-Fetch effect is observed. (C) 2016 Elsevier B.V. All rights reserved.
Keywords : GRAIN-SIZE ATTRITION TREATMENT STAINLESS-STEEL Nano-indentation In situ micro-pillar compression Mechanical property gradient Mechanical surface treatment Tribologically Transformed Surface (TTS) Iron SEVERE PLASTIC-DEFORMATION HALL-PETCH RELATIONSHIP STACKING-FAULT ENERGY NANOCRYSTALLINE MATERIALS INDENTATION EXPERIMENTS DISLOCATION DENSITY SHARP INDENTATION
Type de document :
Article dans une revue
Materials Science and Engineering: A, Elsevier, 2016, 667 (189-198 ), 〈10.1016/j.msea.2016.04.059 〉
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https://hal-emse.ccsd.cnrs.fr/emse-01505794
Contributeur : Géraldine Fournier-Moulin <>
Soumis le : mardi 11 avril 2017 - 18:04:23
Dernière modification le : mardi 17 juillet 2018 - 11:00:14

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David Tumbajoy-Spinel, Sylvie Descartes, Jean-Michel Bergheau, Victor Lacaille, G Guillonneau, et al.. Assessment of mechanical property gradients after impact-based surface treatment: application to pure alpha-iron. Materials Science and Engineering: A, Elsevier, 2016, 667 (189-198 ), 〈10.1016/j.msea.2016.04.059 〉. 〈emse-01505794〉

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