The behavior of dynamic recrystallization of alloy tool steel SKS51 (/% : 0.78C
0.20Si
0.40Mn
1.5Ni
0.30Cr) in single pass hot compression test with strain rate 0.1 ~ 10 s
-1
at 850-1 000 ℃ is studied by using Gleeble-1500 thermo-mechanical simulator. Results show that the dynamic recrystallization of steel SKS51 more easily occurs with lower strain rate at higher deformation temperature ; by regression analysis the deformation activation energy and stress exponent of dynamic recrystallization of steel are respectively 336. 97 kJ/mol and 4.26