Impact des conditions d'usinage sur la zone du matériau affectée par le procédé

Abstract

Machining processes can introduce residual stresses at the surface of machined workpieces and can odify the microstructure and texture in a volume close to the surface. Such changes are important when controlling the behaviour of these workpieces during the workpiece lifetime. It is thus necessary to quantify residual stresses and texture components and to determine the machining-induced microstructure to understand and predict the behaviour of modified surfaces. In this study, particular attention was paid to pure copper considered as a modelling system. The influence of the nose radius, the cutting speed and the lubricant on the surface stress field and the surface texture was quantified by means of XRD techniques. The microstructural modifications at the specimen surface and in depth were evaluated using scanning electron microscopy. The electrochemical behaviour of modified surfaces were studied from local measurements using the electrochemical microcell technique. © AFM, EDP Sciences 2007.