Investigation of contact-induced near-surface materials transformations using nanomechanical testing.
October 1-6, 2017
Mechanical surface treatments, such as shot peening – burnishing – deep rolling, are known for their efficiency to improve resistance to abrasive wear and local fatigue crack propagation. They are based on repeated contact loadings that create large plastic strains in the near-surface leading to compressive residual stress field and local grain refinement (Tribologically Tranformed Surfaces, Fig1). A significant gradient of mechanical properties over 100 µm is usually observed. This paper aims to present a methodology based on nanomechanical testing –i.e. micropillar compression, nanoindentation - and EBSD measurements to explain microstructure changes induced by such treatments. This methodology is applied to various cases ranging from severe shot peening (Fig1) to sliding friction contacts (Fig2).
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Guillaume Kermouche, Gaylord Guillonneau, Richard Chromik, and Johann Michler, "Investigation of contact-induced near-surface materials transformations using nanomechanical testing." in "Nanomechanical Testing in Materials Research and Development VI", Karsten Durst, Technical University of Darmstadt, Germany Eds, ECI Symposium Series, (2017). http://dc.engconfintl.org/nanomechtest_vi/81