Dynamic restoration of 24% chromium ferritic steels

Kinetics of ferrite dynamic recrystallization with 24% chromium steels was studied by means of laboratory tests. Recrystallization was studied in a temperature range of 1173 to 1573 K at deformation rates to 5×10¹ s^–1. The kinetics of ferrite dynamic recrystallization was evaluated by means of a parametric equation dependent on the Zener-Hollomon parameter. The results proved that in using the recrystallization activation energyQ _RD= = 273·9 k J mol^–1 the constants of the parametric equation, determined earlier for austenite, are valid for ferrite as well. In addition, the dependence of the grarn size on deformation stress and on carbonitride stabilization was assessed.