Influence of Process Routes on Strain Homogeneity During Equal Channel Angular Pressing
Equal channel angular pressing(ECAP) is regarded as one of the most promising process of fabricating bulk ultra-fine grain materials.The effective strain in the billet was analyzed by rigid plastic finite element method during multipass equal channel angular press with different routes.The results show that the effective strain at the bottom part of the middle main deformation zone is low after 1 pass ECAP.The effective strain becomes more inhomogeneous after multipass ECAP by route A,and the difference of effective strain between the bottom and top surface part increases.The effective strain at the top and bottom surface part is lower,and the center part is higher after multipass ECAP by route C.The effective stain distribution is more homogeneous after ECAP by route BC than other routes,and the difference at the high effective strain zone is low,and the fraction of the high effective strain zone is bigger.The simulation results can instruct the technology establishment during equal channel angular press.