Dynamic Recrystallization Critical Conditions of Hydrogenation Reactor Heavy Cylinder Manufactured with Alloy Steel
The true stress-true strain curves of hydrogenation reactor heavy cylinder manufactured with 2.25Cr1Mo0.25V alloy steel were achieved by a series of isothermal compression test on Gleeble-3500 thermal simulator at 1000-1200 ℃under the strain rate of 0.001-1s-1.Based on the experimental data of stress-strain,the critical conditions of dynamic recrystallization were researched by the computation of the work hardening rate θ and characteristics of the inflection point of lnθ-e curves.The quantitative relationship between deformation condition and critical strain was obtained by introducing Zener-Hollomon parameters.The results indicate that the critical strain becomes smaller with the strain rate decreasing and temperature increasing and the predicting model of the critical strain can be written as: ec=1.716×10-3Z 0.216 18.