Multicyclic deformation of steel 20 on physical modeling complex Gleeble 3500 with 4 treatment regimes was conducted. 1 - compression, 2 - tension-compression, 3 - 20 cycles of tension-compression from 1100 to 870 oC, 4 - 20 cycles of isothermal tension-compression at 870 oC. True strain during treatment with 1st and 2nd regimes was ε = 0,4 and with 3rd and 4th regimes was ε = 8. Influence of thermo mechanical treatment on dynamic recrystallization process and complex of mechanical and microstructure steel 20 parameters formation was investigated. It was found that the true stress does not depend on the loading scheme, compression or tension, and depends on the the strain. It was established that the thermal deformation processing mode determines the mutual relation of the hardening and softening processes. Thus, the treatment with the 3rd regime led to a continuous stress increase, while the treatment with the 4th regime led to continuous stress decrease. This is due to the predominance of the softening processes speed such as dynamic recovery and dynamic recrystallization processes over the strain hardening. It is shown that multicyclic deformation leads to oriented structure formation in the steel.

Gleeble 3500, dynamic recrystallization, thermo mechanical treatment, carbon steel, Gleeble 3500, multicyclic treatment, true stress, electron microscopy, softening, true strain, dynamic recovery.