Vliv obsahu uhlíku na aktivační energii při tváření za tepla a kinetiku dynamické rekrystalizace nelegovaných ocelí

Abstract

This work is focused on the influence of carbon content on activation energy during hot forming and kinetics of dynamic recrystallization of unalloyed steels. The research is based on a comparison and analysis of the stress curves measured by the uniaxial pressure isothermal tests using the HDS-20 Universal Simulator. The strain rate was in the range of 0.05 - 20 s-1, the logarithmic (true) deformation was 1. It was found that with increasing carbon content in the steel, the activation energy decreases. It was confirmed that steels with a higher carbon content showed a greater maximum deformation resistance for a given Zener-Hollomon parameter. It was found that steel with the highest carbon content (0.733 wt.%) Showed lower peak deformation at high Zener-Hollomon parameters, unlike low carbon steel.