Créé le : 01/07/2014
Cristina Revilla-Gomez, Jean-Yves Buffière, Catherine Verdu, Loïc Daflon, Catherine Peyrac, Fabien Lefebvre - 01/05/2013 - RC : SF2M Journée de Printemps 2013…
To understand in detail the effect of hammer peening on fatigue resistance of high strength welded steel S690, investigations have been carried out. Cyclic four points bending tests have been performed on butt weld samples. Microstructural modifications induced by hammering and their subsequent influence on fatigue life have been studied using residual stresses analyses by X-ray diffraction, microhardness tests, Field Emission Scanning Electron Microscope (FESEM) and Electron Back Scattering Diffraction (EBSD). It is shown that hammering induces beneficial compressive residual stresses (increase of the fatigue life by a factor 2.3). In the hammered area, an ultra-fine grain microstructure is observed, which could be a key factor for explaining the improvement of the fatigue life of the material.
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