Steel Thixoforging: Heat Exchange Impact on the Mechanical and Metallurgical Features of Thixoforged Samples
TypeArticles dans des revues avec comité de lecture
Steel thixoforging process combines the advantages of performing parts having highly complex shapes and good mechanical properties. These advantages result from the shear thinning flow behaviour of semi-solids due to microstructure changes during the material deformation. Many parameters such as steel grade, raw speed, slug temperature, tool temperature influence the steel thixoforging process. In this work, we are interested in analysing the influence of thermal conditions as well as ram speed on the flow behaviour and the microstructure of the final parts. To do so, thixo-extrusion tests on a high speed hydraulic press were performed on C38 steels using different ram speeds and different temperatures for the tools. The temperature is measured in the die close to the tool-material interface during the whole process. Correlations between the temperature measurements, the flow profile and the microstructure are discussed. Using the Finite Element code Forge2005, these thixo-extrusion tests are simulated. Using an inverse method, some parameters used in the thermal exchange modelling are identified by successive comparisons between calculated and measured temperatures within the die.
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BECKER, Eric; BIGOT, Régis; LANGLOIS, Laurent; FAVIER, Véronique; PIERRET, Jean-Christophe; CEZARD, Pierre (Springer Link, 2008)Since always, Industry minimizes manufacturing process plan and increases mechanical behaviour. In this topic, the thixoforging process offers important perspectives especially steel thixoforging. It is on the way of ...
BECKER, Eric; BIGOT, Régis; LANGLOIS, Laurent; FAVIER, Véronique; PIERRET, Jean-Christophe; CEZARD, Pierre (2008)Since always, Industry minimizes manufacturing process plan and increases mechanical behaviour. In this topic, the thixoforging process offers important perspectives especially steel thixoforging. It is on the way of ...
Impact of experimental conditions on material response during forming of steel in semi-solid state BECKER, Eric; FAVIER, Véronique; BIGOT, Régis; CEZARD, Pierre; LANGLOIS, Laurent (Elsevier, 2010)Semi-solid forming is an effective near-net-shape forming process to produce components with complex geometry and in fewer forming steps. It benefits from the complex thixotropic behaviour of semi-solids. However, the ...
CEZARD, Pierre; BIGOT, Régis; BECKER, Eric; MATHIEU, Stéphane; PIERRET, Jean-Christophe; RASSILI, Ahmed (E. Cueto and F. Chinesta, 2007)Through different papers [1,2], authors shown that the influence of thermal exchanges was a first order parameter on the semi-solid steel behaviour, and certainly for every semi-solid metallic materials. These thermal ...
BECKER, Eric; CEZARD, Pierre; MATHIEU, Stéphane; BIGOT, Régis; LANGLOIS, Laurent (Association Française de Mécanique, 2007)Analyse l’influence de la vitesse du coulisseau et de la température du lopin (fraction liquide) sur le comportement de l’acier à l’état semi-solide en utilisant un nouvel outillage de filage direct monté sur une presse ...