Static (non-deformation) and dynamic (deformation) continuous cooling transformation (CCT) curves of steel0.33C-1.0Mn-0.8Si was measured by Gleeble-3500 thermo-mechanical simulator

and structure of steel was observed. Results showed that the deformation of overcooling austenite could increase initial transformation temperature of ferrite

but had no obvious influence on temperature of completion of transformation

the zone of ferrite transformation of deformed overcooling austenite enlarged

and Ar

3

value for deformed austenite was higher by 100 ℃ than that for non-deformed austenite while effect of deformation on Ar

1

was no-obvious; and with increasing cooling rate

the morphology of fer- rite grain changed from polygonal to lath and long leaf structure and the pearlite colonies became more fine and dispersed

and the continuous cooling structure fo

r deformed austenite was finer than that for non-deformed austenite.