Abstract
Elliptical cross-sectioned spiral equal-channel extrusion is newly developed sever plastic deformation technique that can be used for processing of cylindrical components. In the present study, numerical and experimental investigations were made to identify optimal setting of process parameters i.e. torsion angle, elliptical rotation transitional length and elliptical length ratio attaining minimum punch force and maximum effective strain. Firstly, the process was numerically simulated by using DEFORM software. Then, 15 series of simulation runs was implemented based on central composite design incorporating three-factors and three-levels. Response surface methodology was used here to correlate relationship between factors and responses. In order to find optimum solution regarding maximum strain and minimum punch force, desirability approach was used. The optimization results showed that for achieving maximum strain (that is most desirable during severe plastic deformation), settings of 120° torsion angle, 9 mm channel length and 1.45 elliptical length ratio was required. From the results obtained through experiments, it was found that performing three-passes ECSEE under optimal combination of factors resulted in about 30% enhancement in values of ultimate tensile strength and hardness.
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