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The paper presents the results of the effect of deformation parameters on the hot-deformation behavior of the newly developed multi-phase steel assigned for production of forged machine parts. Continuous and interrupted compression tests of the samples after the given deformation were carried out with the use of the Gleeble 3800 thermomechanical simulator. The samples were tested in the temperature range from 900°C to 1100°C at the rate of 0.1s-1 and 1s-1. Basing on the analysis of the form and the course of curves obtained in the compression test, it was found that in the studied range of parameters of hot plastic deformation, the decrease of strain hardening of studied steel is caused by the process of dynamic recrystallization. This is also confirmed by calculation results of activation energy of plastic deformation process. Executed hot compression tests will contribute to establishing conditions of forging of newly developed multi-phase steel with the method of thermo-mechanical treatment.
Keywords: Multi-phase steel, hot plastic deformation, dynamic recrystallization, thermo-mechanical treatment© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.