extrusion operation necessity 1

[MetalEng]

some aluminium supplier, for using DC-cast billets in forging industry,use from an preliminary extrusion operation.Why?

 

[TVP]

The preliminary extrusion operation refines the grain size (makes it smaller) and removes many of the other defects inherent in cast structures (variable grain size & orientation, porosity, etc.). Smaller, more homogeneous grains result in higher formability and reduced cracking during forming.

 

[MetalEng]

Dear TVP,
COULD YOU PLEASE,GIVE ME SOME INFORMATION,REGARDING TO AS-FORGED & AS-EXTRUDED PROPERTIES OF 6082 WROUGHT AL ALLOYS,AS WELL AS ABOUT ITS MICROSTRUCTURE ?THANKS IN ADV.