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Microstructure Evolution and Material Flow of Steel in Semi-solid Forming Process

Communication avec acte
Author
GU, Guochao
ccBECKER, Eric
ccPESCI, Raphaël
178323 Laboratoire d'Etude des Microstructures et de Mécanique des Matériaux [LEM3]
107452 Laboratoire de Conception Fabrication Commande [LCFC]
ccLANGLOIS, Laurent

URI
http://hdl.handle.net/10985/8954
Date
2011

Abstract

The present study aims to identify and characterize the development of microstructure and deformation characteristics of steel grades in semi-solid state which is affected by the change in morphologies of microstructure at high temperature. Thixoextrusion tests with different combinations of forming temperature and forming speed were performed. It was identified that several process parameters, such as initial billet and die temperatures or forming speed, affect thermal exchanges thereby influencing the microstructure evolution and material flow. Furthermore, 2D and 3D microstructure characterization was performed on the same sample which was partial remelted and quenched. Reconstructed 3D images were compared with the ones obtained with a Scanning Electron Microscope and an Energy Dispersive Spectrometry system. The good agreement between 2D SEM observations and 3D X-ray microtomography results makes these two techniques efficient to characterize steels in the semi-solid state.

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