Effect of a superficial nanostructured layer on the mechanical properties of metallic parts

Abstract : Surface Mechanical Attrition Treatment (SMAT) is a severe plastic deformation process derived from shot peening. It induces a grain refinement down to the nanometer scale in the top surface of the treated metallic specimens, whereas the average grain size of the bulk of the sample remains in the micrometer range. From a mechanical point of view, this treatment leads to a considerable enhancement of the yield strength, the ultimate strength and the fatigue life of the SMA-treated materials. These improvements can be explained by the modification of the roughness, the superficial hardness and the generation of compressive residual stresses below the surface induced by the process. Besides, SMAT can be coupled to co-rolling to generate nanostructured multilayer composite structures with even more enhanced mechanical properties.
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Submitted on : Tuesday, September 3, 2019 - 11:18:04 AM
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Delphine Retraint. Effect of a superficial nanostructured layer on the mechanical properties of metallic parts. Matériaux & Techniques, EDP Sciences, 2011, 99 (1), pp.101-104. ⟨10.1051/mattech/2011008⟩. ⟨hal-02276935⟩

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