Use of Thermocycling Deformation for Raising the Operating Properties of Low-Carbon Steel

The effect of thermocycling deformation and subsequent heat treatment on the microstructure and mechanical properties of low-carbon steels 10kp, St3ps and 20 is studied in cast condition and after rolling. Metallographic analysis of the steels is performed using an optical microscope at a magnification of x140 and x500. The microhardness of the structural components is measured. The mechanical properties of the steels are determined in tensile tests. It is shown that after the thermocycling treatment above the temperature Ac-3 all the structural components are refined. The strength of the forgings after the thermocycling treatment, quenching and low tempering increases by a factor of 1.7 - 2.4 at a satisfactory level of ductility.