The austenite dynamic recrystallization process of V-Ti microalloying non-quenching- tempering steel 38MnVS (/% : 0.42C

0.76Si

1.33Mn

0.011S

0.013P

0.10V

0.02Ti) has been studied. The effect of deformation temperature (950-1150 °C ) and strain rate (0.1-10 s

-1

) on austenite dynamic recrystallization of steel 38MnVS is studied by Gleeble-3800 thermal simulation test machine

and the function related Zener-Hollomon parameter

dynamic recrystallization size model and dynamic recrystallization diagram are established. Results show that the higher deformation temperature and the lower strain rate

the smaller critical driving force to occur dynamic crystallization and the easier to carry out dynamic recrystallization: the activation energy Q

d

for dynamic crystallization of microalloying non-quenchine-tempe- ring steel 38MnVS is 275.453 kJ/

mol.