Hardening by Torsion and Process Modelling

This work describes an experimental study and simulation of the process of hardening by torsion in combination with heat treatment for workpieces with round cross section using in ANSYS Workbench. Hardening by torsion creates compressive stresses on the workpiece surface and simultaneously leads to strain hardening by the dislocation mechanism. The formed stress-strain state is favorable for coils of cylindrical springs as it reduces the stress on the surface of the coils from an external load. In contrast to the process of hardening by patenting, torsional deformation does not reduce the diameter of the workpiece and hardening over the cross section is distributed in accordance with the amount of torque. The hardening mechanism examined in this work can be applied to torsion rods, thus replacing shot peening and roller burnishing.

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