A COMPLETE STUDY OF EQUAL CHANNEL ANGULAR EXTRUSION PROCESS, A PROMISING METHOD FOR PRODUCTION OF NANOSTRUCTURED MATERIALS

摘要

Equal channel angular extrusion (ECAE) is denned as a deformation process that produces intense and uniform plastic deformation caused by simple shear of the material and it is being investigated as an effective method for forming nanostructured materials. This paper presents a thorough study of the ECAE via finite element. A two dimensional model consisting of a stainless steel billet and the die system was constructed. The effect of the most significant parameters, namely, angle of extrusion, temperature, and friction on the extruded final product was investigated. The stresses, axial strains, shear strains, and principal strains as a function of extrusion time for nine different models, at three different sections (top, bottom and middle of the billet), and eleven equally spaced points per section are presented. The deformations patterns are different when moving from top to bottom and when moving from center to circumference of the billet. Also all the variables studied, extrusion angle, temperature and friction have a significant effect on the final extruded product.