Microstructure investigation and flow behavior during thixoextrusion of M2 steel grade
TypeArticles dans des revues avec comité de lecture
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 liquid fraction range between 10% and 30% (according to differential scanning calorimetry measurements and quantitative image analyses). A conventional microstructure for thixoforming process was obtained: spherical solid grains surrounded by liquid phase. The microstructure across the heated billets was relatively homogeneous with bigger grain size near the surface. Successful thixoextrusion for producing parts was finally achieved at processing temperatures. By investigating the microstructure and load-displacement curves, different mechanisms in various forming stages were proposed.
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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; 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 ...