Document Type : Research Article
Department of Mechanical Engineering, Engineering faculty, Razi University, Kermanshah, Iran
The main idea of the present work is to provide an analytical approach for the analysis of mating surface stretch during successive equal channel angular pressing(ECAP) of core/shell bimetallic materials. Furthermore, the novel relationships between maximum stretches induced in each ECAP pass with the numbers of passes and the yield strength of ECAPed bimetallic are presented. To evaluate established relations, the tensile test is performed on steel cores of the copper/steel bimetallic samples subjected to consecutive ECAP process up to three passes with route BC, which rotates the samples by +〖90〗^oaround the longitudinal axis between each ECAP pass. The results indicated that, for a given ECAP die, the maximum stretch is a linear function of pass number of deformation with ECAP. The values of the angular position corresponding to extreme values of stretch increased as the number of pass deformations with route BC increased. Also, the value of the minimum stretch could be increased beyond a threshold value in ECAP with route B by increasing the number of pass deformation. After N passes deformation by the ECAP method, the yield strength of bimetallic samples can also be determined by estimating the maximum stretch using an established predictive model.