Modeling Dynamic Recrystallization of As-Cast 25Mn Steel under Hot Deformation Conditions

Ju Li, Yongtang Li, Yuchao Qi, Bufang Lei


To investigate dynamic recrystallization (DRX) of as-cast 25Mn steel, the hot compression experiments corresponding to a height reduction of 70% was conducted on Gleeble-3500 simulator in the temperature range from 900 to 1200 ℃ at an interval of 100 ℃ and the stain rate of 0.1, 0.5, 1 and 2 s-1. By analyzing and calculating the true stress-strain data, the deformation activation energy, characteristics strain model, DRX kinetic model and grain size model were obtained. The experimental results revealed that strain hardening and flow softening characterized the flow behavior. The higher temperature and the lower strain rate made DRX of as-cast 25Mn easier. The best final forging temperature is no less than 900 ℃ and strain rate is no more than 2 s-1. In addition, through the detailed comparison between predicted and experimental fraction of DRX, the predicted showed a very good agreement with the actual experimental.


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