Abstract: Buck of ultra-fine grain (submicrostructured or nanostructured materials) materials could be acquired by equal channel angular pressing (ECAP) with enough deformation. The node mapping method is used shifting previous effective strain to next initialization nodes position, realize simulation of equal channel angular multi-pass pressing process with finite element analysis. Finite element analysis is carried out to investigate different die angles of equal channel angular multi-pass pressing, the distribution rules of the cross section of specimen cumulate effective strain is acquired. These results present optimization process for ECAP’s die design and processing routes to refine grain of specimen.

Key words: Equal channel angular pressing, Finite element analysis, Node mapping method, Ultra-fine grains