Abstract：With continue observing the microstructural of TWIP steel at different tension, we find that: lots of dislocation can been seen in crystal grains and twin can’t be found at ε=5%; when the tension is up to 10%, lots of flakes like twins can be seen in crystal grain by optical microscope, and more higher density can be seen by transmission electronic microscope; in the larger tension, lots of deformation twins were produced, and more twinning systems were activated and twin bands intersected each other. Crystal grain is cut to cell by twins.
The TWIP effect were found during tension: (a) dislocation were against by twins, work handing were raised in this part so made the tension in other parts. (b) The twins which were produced in the fist were against the twins which were produced as follow, and the more twin boundaries also against dislocation to move, so work handing continue raised. (c) The process of twins have a lot of deformation.
2010, Vol. 45 
