TECHNOLOGICAL ASPECTS CONCERNING SEVERE PLASTIC DEFORMATION BY EQUAL CHANNEL ANGULAR PRESSING

摘要

The paper presents some considerations regarding Severe Plastic Deformation (SPD) with reference to the Equal Channel Angular Pressing (ECAP). The properties of the materials obtained depend on the plastic deformation behavior during ECAP, which is governed mainly by the die geometry, the material itself and the processing conditions. As the mechanical properties of the severely deformed material are directly related to the deformation history, understanding the phenomena associated with strain and forces development in the ECAP process becomes important. A comparative study of the forces in the process of severe plastic deformation is analyzed by using two type of dies with 120° and 90° between channels. It is also presented a method to determine the friction in the first channel.