Processes for producing fine grained metal compositions...

C - Chemistry – Metallurgy – 22 – C

Patent

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C22C 1/00 (2006.01) B21C 23/00 (2006.01)

Patent

CA 2375916

There are provided a continuous frictional extrusion process for continuously producing a deformed fine grain solid metal composition suitable for semi- solid forming. The process is featured by a large range of product dimension and by precise control of the process parameter, such as total deformation, extrusion temperature and speed. The total deformation is controlled to be larger than a Mises effective strain of 2.3 to obtain a deformed fine grain structure with enough distortion energy stored, having a grain size less than 30 µm and a subgrain size less than 2 µm. A method combining the continuous extrusion process of preparing semi-solid raw material with semi- solid forming of shaped articles is also disclosed.

La présente invention concerne un processus d'extrusion granulaire continu permettant de produire en continu une composition métallique solide de grains fins déformés convenant au formage de semi-solides. Ce processus est caractérisé par une grande gamme de dimensions des produits et par un contrôle précis des paramètres du processus, tels que la déformation totale, la température d'extrusion et la vitesse. La déformation totale est contrôlée de sorte qu'elle soit supérieure à une contrainte effective de Mises de 2,3 afin d'obtenir une structure de grains fins déformée avec suffisamment d'énergie de distorsion stockée, présentant un calibre de grain inférieur à 30 µm et un calibre de subdivision de grain inférieur à 2 µm. L'invention concerne aussi un procédé qui associe le processus d'extrusion continu de préparation de matériau brut semi-solide au formage à l'état semi-solide d'articles moulés.

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