The dynamic recrystallization of 10 mm strip of Nb-Ti microalloying low-carbon steel (/% : 0.06C
0.22Si
1.80Mn
0.03Nb
0.15Ti
≤0.007N
≤0.002S) in single pass compression with strain rate 0.1-20.0 s
-1
total deformation 75% at 850 -1100℃ has been tested and studied by using Gleeble 1500 hot simulator. Based on true stress- true strain curves combined work-hardening rate curve it is obtained that the dynamic recrystallization critical strain is 0.4-0.7 and the complete recrystallization strain is 1.1-1.4. The hot deformation activation energy of steel is 618.225 kJ/mol. And based on the Zener-Hollomon equation and dynamic recrystallization status diagram by tested results
it is obtained the dynamic model of recrystallization of test steel by using Johnson-Mehl-Avrami (JMA) equation method to get the r
eal value of recrystallization volume fraction and by using Epsilon-P model to regress on the test data.