Simulation of the Accumulative Roll-Bonding process through warm torsion test

Abstract

The objective of this work was simulating the process of severe plastic deformation, specifically the Accumulative Roll-Bonding process (ARB) in low carbon steel, by warm torsion test, using the typical ARB process parameters. The torsion test was performed at 500 °C, using a total equivalent strain of 4.0, with increment of 0.8 per pass and keeping the constant strain rate of 0.1 s−1, as well as intermediate strains of 0.8, 1.6, 2.4 and 3.2. Along with the reduction of the average grain size there was an increase in the hardness of 43%. Torsion test was performed until failure, increasing the yield stress by about 380 MPa. After processing, the average grains size with 0.93 μm were obtained showing that the torsion test is an efficient tool for simulating ARB process. Keywords: Torsion test, Severe plastic deformation, Accumulative Roll-Bonding, Ultrafine grain