Through single pass and two pass thermal simulation experiment

the rolling process in recrystallization zone with deformation 20% ~ 50% at deformation temperature 980

1 000

1 020 °C

and with different deformation 25%~40% at 1000°C

and interval time (1~20 s) after deformed at 1000°C is studied. And the affect of deformation process interval time

deformation temperature and deformation quantity on grain size

cleavage unit size and texture are characterized and analyzed through metallographic examination

EBSD ( Electron Backscattering Diffraction) and X-ray deffraction (XRD). The results show that microstructure grain size and cleavage unit size greatly refine with recrystallization interval time decreasing

deformation temperature decreasing in recrystallization zone and deformation increasing. When deformation temperature decreases to 980°C，more{110} glide plane can be obtained

thereby increasing toughness.