EFFECT OF HOT DEFORMATION REGIME ON RECRYSTALLIZATION OF 20CrMoH ALLOY STEEL
The thermal deformation behavior of 20CrMoH alloy steel at the deformation rate of 1 s-1at the deformation temperature of 900～1 050 ℃ with the reduction of 20％(quick cool immediately after deformation),20％+20％(quick cool immediately after deformation、keep 60 s at the deformation temperature then cooled immediately)and 65％(quick cool immediately after deformation)was studied by Gleeble-3500 thermal simulation tester.It was found that with the increase of deformation,the recovery recrystallization increases obviously.And the grains grow up in different degrees.With the increase of deformation,the degree of recrystallization increases obviously.The material did not complete dynamic recrystallization even at 1 000 ℃ when the deformation was 20％.When the deformation amount increases to 65％,the dynamic recrystallization can be completed at 950 ℃,and uniform fine grains can be obtained.The holding time after deformation has a significant effect on the recrystallization when the deformation was two passes(20％+20％).The material can complete recrystallization at 900 ℃ and form uniform grains within 60 s.When the material was quickly cool immediately after deformation,the temperature of completed recrystallization can rise to more than 1 000 ℃.
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