Deformation behavior of supermartensitic stainless steel in hot compression tests

The deformation behavior of supermartensitic stainless steel 02Cr13Ni4Mo was investigated through compression test using Gleeble-3800 thermo-mechanical simulator within the temperature range of 900-1200 °C and strain rate range of 0,01-10 s-1. The results showed that the flow stress increases with the drop in the temperature and increasing strain rate. Flow stress of supermartensitic steel exceeds the flow stress of martensitic steel 20Cr13 for same regimes of deformation. Critical strain required to start dynamic recrystallization has similar values for supermartensitic and martensitic steel. The activation energy of hot deformation of supermartensitic steel (442 kJ/mole) is slightly higher than that of martensitic steel (430 kJ/mole). Apparently, this difference is due to a decrease in the carbon content and addition of molybdenum in the supermartensitic steel, which dramatically increases the activation energy of self-diffusion of γ-iron.