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

David Tumbajoy-Spinel; Sylvie Descartes; Jean-Michel Bergheau; Victor Lacaille; Gaylord Guillonneau; Johann Michler; Guillaume Kermouche

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} Gaylord 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 - 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.

Keywords : SHARP INDENTATION DISLOCATION DENSITY ATTRITION TREATMENT STACKING-FAULT ENERGY GRAIN-SIZE HALL-PETCH RELATIONSHIP SEVERE PLASTIC-DEFORMATION Iron Tribologically Transformed Surface Mechanical surface treatment Mechanical property gradient In situ micro-pillar compression Nano-indentation STAINLESS-STEEL INDENTATION EXPERIMENTS NANOCRYSTALLINE MATERIALS

Document type :

Journal articles

Domain :

Engineering Sciences [physics] / Materials

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https://hal-emse.ccsd.cnrs.fr/emse-01505794
Contributor : Géraldine Fournier-Moulin <>
Submitted on : Tuesday, November 20, 2018 - 12:41:55 AM
Last modification on : Friday, May 10, 2019 - 3:49:58 PM

tumbajoyspinel2016.pdf

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