Abstract:

The process of subjecting to severe plastic deformation enables the formation of ultra-fine grains in order to enhance the mechanical properties of the material. Equal Channel Angular Pressing (ECAP), which is one of the methods of extreme plastic deformation, is a technique that allows the improvement of mechanical properties by subjecting the material to shear stresses without any change in the material cross-section. The improvement of mechanical properties in materials through this method is dependent on both the process parameters and the optimization of these parameters. In particular, the die angles are of critical importance during the passage of the material through the channel. These angles directly influence the applied force and the amount of deformation that will occur. Predicting the deformation that may occur in the material prior to the start of the experimental process is crucial for the proper progression of the process. In this study, the channel angle, outer corner angle, and inner corner radius value, which are among the most influential parameters on grain size, have been taken into account. The channel angle (Φ) has been set to 900 and 1200, the outer corner angle (ψ) to 00 and 200, and the inner corner radius values to 0, 2, 4, 6, 8, and 10 mm. The contact between the die and the sample is assumed to be frictionless, and the amount of deformation undergone by the sample has been determined, and the required force value has been calculated. According to the obtained data, the highest stress value was observed in the model with Φ=900, ψ=200, and r=0 mm. Increasing the channel angle reduces the force value while also decreasing the amount of deformation. Increasing the inner corner radius value results in significant changes in stress values for the Φ=900 channel angle, but no significant changes were observed for the Φ=1200 channel angle.

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