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Usinabilité d'alliages Cuivre-Béryllium : influence de la microstructure

Abstract : The document presented hereby study the relationship existing between machining and materials behaviors, especially from a microstructure's perspective. The main purpose of this study is to understand the variability of cutting process of copper-beryllium alloys with improved machining capabilities, despite the fact that their macroscopic mechanical properties are even. After a description of those alloys and the characterization methods used in the present work, the machining of different materials are presented. The stresses and temperatures reached during orthogonal cutting are recorded and will describe the machinability. Experimental results of machining alloys which are in different metallurgical states are then presented. Those results will help the implementation of an analytical model of chips formation. The influence of machining process on work pieces and chips produced by orthogonal cutting of copper-beryllium alloys are then completed by a study of model materials developed in this work. Those alloys presenting well defined microstructure still possess the same hardness despite different thermo-mechanical treatments including mechanical deformation and ageing. A very detailed microstructure analysis of those model materials shows the influence of initial microstructure on their machinability. Diffusion mechanisms are put in light thanks to the information delivered by the analytical model (interaction time, transit time and temperature obtained through the different shear bands). Those assisted diffusion mechanisms explain the material behaviour during the orthogonal cutting. At last, better ways of material forming are exposed in order to have simultaneously excellent mechanical properties and excellent machinability for copper-beryllium alloys
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Submitted on : Wednesday, April 10, 2019 - 9:12:30 AM
Last modification on : Friday, August 5, 2022 - 2:54:00 PM


  • HAL Id : tel-02094851, version 1


Alban De Saever. Usinabilité d'alliages Cuivre-Béryllium : influence de la microstructure. Matériaux. Université de Lorraine, 2016. Français. ⟨NNT : 2016LORR0352⟩. ⟨tel-02094851⟩



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