Dynamic adjustment of ferrite grains during dynamic strain induced transformation

Abstract

The dynamic adjustment of ferrite grains formed during ‘dynamic strain induced transformation (DSIT)’ is an important feature of this mechanism that has not been addressed previously. A novel experimental method was applied to follow the effect of deformation at different stages on ferrite formed initially through DSIT. It is shown that while the continuous dynamic recrystallisation (CDRX) appears to be an acceptable mechanism for re-refinement of coarser grain size (i.e. d α >2 d DSIT ), it cannot explain the steady state grain size for finer ferrite grains (i.e. d α <2 d DSIT ). Other potential mechanisms involved in this phenomenon are examined.