The high temperature tensile test and microstructure characterization of 0.10C5Mn2Al steel with strain rates 10
-2
/s at 750 ~ 850 ℃ are carried out. The results show that the elongation of 0.10C5Mn2AI steel strain rate 10
-2
/s at 750 °C
800 °C and 850 ℃ is 320%
570% and 730% respectively to obtain superplasticity. In the process of superplastic deformation
both austenite and ferrite grains grow due to the combination of deformation and high temperature and the reformation is the main cause of grain growth.