Investigation of the effective parameters in severe plastic deformation of strip type samples

In this study equal channel multi angular pressing (ECMAP) process as one of the most effective severe plastic deformation (SPD) techniques in producing ultrafine grained AL5754 alloy has investigated using combined Taguchi-Grey method. Response parameters of Taguchi were obtained using Deform2D software. Due to the number of investigated factors, Taguchi L27 orthogonal array were selected. Process parameters and die geometrical parameters considered as input parameters and the plastic strain of final strip, the strain inhomogeneity of the final strip and the process force were selected as objective parameters. Then, input parameters values of optimum condition were extracted which the objective of the optimization was minimizing both process force and strain inhomogeneity and maximizing the equivalent plastic strain. Moreover, using the regression analysis, first order relation among input parameters and objectives were obtained. Then, with the aim of specifying the effectiveness of each input variable on objective parameters, analysis of variance (ANOVA) was employed. The results revealed that, three parameters namely friction coefficient (Fc), die channel angle (Φ1) and die corner curvature angle (Ψ2) are the most effective parameters, respectively.