Effets des échanges thermiques sur l'écoulement de l'alliage semi-solide mis en forme par thixoextrusion
TypeCommunications avec actes
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 a été réalisé sur un acier. Les effets de la température initiale du lopin et de l’outillage, de la vitesse de mise en forme et de la présence d'une couche de Ceraspray® à l'interface de l'outil et du lopin ont été étudiés par des expériences et confrontés à la simulation.Semi-solid processing is an innovative technology for near net-shape production of components, where the metallic alloys are processed in the semi-solid state. Taking advantage of the thixotropic behavior of alloys in the semi-solid state, significant progress has been made in semi-solid processing. However, the consequences of such behavior on the flow during thixoforming are still not completely understood. To explore and better understand the influence of the different parameters on material flow during thixoextrusion process, thixoextrusion experiments were performed using the low carbon steel C38. The billet was partially melted at high solid fraction. Effects of various process parameters including the initial billet temperature, the temperature of die, the punch speed during process and the presence of a Ceraspray layer at the interface of tool and billet were investigated through experiments and simulation. After analyzing the results thus obtained, it was identified that the aforementioned parameters mainly affect thermal exchanges between die and part. Furthermore, the thermal effects can affect the material flow which is composed of various distinct zones.
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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 ...
BECKER, Eric; GU, Guochao; LANGLOIS, Laurent; PESCI, Raphaël; BIGOT, Régis (AIP, 2010)Semi-solid processing is an innovative technology for near net-shape production of components, where the metallic alloys are processed in the semi-solid state. Taking advantage of the thixotropic behavior of alloys in the ...