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

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.
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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
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David Tumbajoy-Spinel, Sylvie Descartes, Jean-Michel Bergheau, Victor Lacaille, Gaylord 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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