Etude de la co-forgeabilité d'u multi-matériau : application à un coupe d'acier

Abstract : The multi-material forging is a forming process allowing, simultaneously, the welding and shaping of multi-material parts with the right material at the right place. The purpose of the presented work is to identify the necessary conditions to obtain a metallurgical bond during forming between two different grades of steel. First, the state of the art allowed the identification of the physical phenomena occurring during multi-material forging and the determination of the key parameters of the bonding which are the contact pressure and the surface expansion at the both sides of the interface. The mechanisms to establish metallurgical bond by forging are based on the breaking and the dispersion of the oxide layer at the interface then the extrusion of the soft material through the voids generated between the oxide fragments. Second, the characterization methodology of this work is presented. It consists of three “simple” forming tests leading to different interface conditions (contact pressure and surface expansion). The first simulations allow the design of the experimental plan for each test. The comparison between simulations and experiments allows the identification of physical parameters of the simulation. Then, the contact pressure and the surface expansion of the identified simulations are used to analyze the metallographic structure and the bonding at the interface.The developed work confirms the major effect of the contact pressure and the surface expansion on the establishment of a metallurgical bond during multi-material forming. The size and the shape of the oxide particles seem to depend on the thermomechanical path at the interface.
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Submitted on : Monday, March 18, 2019 - 11:56:09 AM
Last modification on : Tuesday, May 28, 2019 - 3:40:08 PM
Long-term archiving on : Wednesday, June 19, 2019 - 2:00:09 PM

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  • HAL Id : tel-02070878, version 1

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Mohammed Enaim. Etude de la co-forgeabilité d'u multi-matériau : application à un coupe d'acier. Autre. Ecole nationale supérieure d'arts et métiers - ENSAM, 2019. Français. ⟨NNT : 2019ENAM0002⟩. ⟨tel-02070878⟩

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