Prediction and Analysis of Microstructure and Mechanical Properties After Equal Channel Angular Pressing of EN 47 Spring Steel

In this paper, ECAP process under room temperature conditions was carried out on EN47 spring steel and its properties were analyzed. Spring steel is corrosion resistant, and it exhibits high tensile strength and has high formability. Because of its desirable properties, it finds application in automotive and industrial suspension applications. The effects on microstructural and mechanical properties are analyzed in this study. Severe plastic deformation causes refinement of the grain structure, and it has been observed after the process. The ECAP was performed at different corner angles φ = 120° and 150° with the radius of curvature ψ = 20° through route A. The microstructural and mechanical properties were analyzed. After the pass, the values of hardness and tensile strength were measured for the different angles. After processing the sample, more columnar structures were observed in 120°, and uniformly distributed grains with equiaxed and less columnar structures were observed in 150°. This is mainly due to the occurrence of grain strengthening effect at the corner angles.