Thixoforming of Steel: New Tools Conception to Analyse Thermal Exchanges and Strain Rate Effects

Pierre Cezard (1) , Régis Bigot (1) , Eric Becker (1) , Stéphane Mathieu (1) , Jean-Christophe Pierret (2) , Ahmed Rassili (2)

1 LCFC - Laboratoire de Conception Fabrication Commande
2 Université de Liège

Through different papers [1,2], authors shown that the influence of thermal exchangeswas a first order parameter on the semi-solid steel behaviour, and certainly for every semi-solid metallic materials. These thermal exchanges hide other parameters effect like, for example, the strain rate influence. This paper tries to determine the influence of these two parameters by using a new extrusion device on a hydraulic press. This new tools conception annihilated the influence of the decrease of the punch speed before stopping and permitted to have a constant speed during the experiment. This work also deals with the homogeneous flow during thixoforming of steel and shows the importance to couple initial temperature of the slug with punch speed. This paper presents different conditions which permitted to have a homogeneous flow by keeping a low load.

Mots clés: Tools conception; Semi-solid; Thixoforming of steel; Thermal effects; Strain rate

Domaines: Génie des procédés; Mécanique des fluides [physics.class-ph]

Pierre Cezard, Régis Bigot, Eric Becker, Stéphane Mathieu, Jean-Christophe Pierret, et al.. Thixoforming of Steel: New Tools Conception to Analyse Thermal Exchanges and Strain Rate Effects. 10th ESAFORM Conference on Material Forming, Apr 2007, Zaragoza, Spain. pp.1155-1160, ⟨10.1063/1.2729670⟩. ⟨hal-01090480⟩