Determination of quantity and localization of liquid in the semi-solid state using both 3D X-ray microtomography and 2D techniques for steel thixoforming
TypeArticles dans des revues avec comité de lecture
The distribution of liquid at the semi solid state is one of the most important parameters for steel thixoforging. It has a great influence on the viscosity of the material, on the flows and finally on the final shape and mechanical properties of the thixoforged parts. Both ex situ and in situ 3D X-ray microtomography characterizations have been carried out to determine the quantity and localization of liquid at high temperature of M2 steel slugs. Microtomography was first performed ex situ at room temperature on samples heated and quenched from semi-solid state. The specimens were also scanned in situ directly at high temperature. The obtained results have been compared to 2D observations using EDS technique in SEM on heated and quenched specimens. They showed a good correlation making both approaches very efficient for the study of the liquid zones at the semi-solid state.
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Effets des échanges thermiques sur l'écoulement de l'alliage semi-solide mis en forme par thixoextrusion BECKER, Eric; GU, Guochao; LANGLOIS, Laurent; PESCI, Raphaël; BIGOT, Régis (Association Française de Mécanique, 2011)Le comportement d’un alliage mis en forme à l’état semi-solide n’est toujours pas bien compris. Afin d’établir l'influence de différents paramètres sur l'écoulement de la matière, un processus de thixoextrusion expérimental ...
GU, Guochao; PESCI, Raphaël; LANGLOIS, Laurent; BECKER, Eric; BIGOT, Régis (Elsevier, 2015)The microstructure investigation and flow behavior during thixoforging of M2 steel parts were investigated. Partial remelting was performed at processing temperatures ranging from 1290 ◦C to 1340 ◦C corresponding to a ...
GU, Guochao; BECKER, Eric; LANGLOIS, Laurent; PESCI, Raphaël; BIGOT, Régis (Wiley-VCH Verlag GmbH, 2011)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 ...
In Situ Microstructure Observation Of Steel Grades In The Semi-Solid State For Thixoforging Process By Using Confoncal Laser Scanning Microscopy GU, Guochao; PESCI, Raphaël; BECKER, Eric; LANGLOIS, Laurent; BIGOT, Régis (Trans Tech Publications, Switzerland, 2015)The microstructure plays a crucial role for steel semi-solid forming process, and particularly for the steel thixoforging process, since it determines the thixotropic flow behavior of materials in the semi-solid state. ...
Application of X-ray Microtomography to Quantify the Liquid Fraction of M2 Steel for Semi-solid Forming process GU, Guochao; PESCI, Raphaël; BECKER, Eric; LANGLOIS, Laurent; BIGOT, Régis (Trans Tech Publications/ Ricardo Alves de Sousa and Robertt Valente, 2013)Thixoforging, one variant of semi-solid metal processing in which the metallic alloys are processed at low liquid fraction (0.1< Fl < 0.3), is used to produce complex parts with high mechanical properties. Steel thixoforging ...