Microstructural Evolution of Ferrite Grains during Dynamic Transformation in 10Ni-0.1C Steel

Abstract

The effect of strain on the microstructural evolution of ferrite grains during dynamic transformation was investigated using a 10Ni-0.lC steel uniaxially compressed at a strain rate of 10−2 s−1 and temperature of 520 ℃. The deformation of the ferrite formed at relatively early stages of dynamic transformation led to the formation of subgrains inside the ferrite grains. The misorientation between subgrains changed from low angles to high angles with increasing strain. The formation of equiaxed grains surrounded by high angle boundaries was confirmed, of which volume fraction increased with increasing compression strain. The results indicated that the grain refinement in the process was not only due to dynamic transformation but also due to the deformation and dynamic recovery/recrystallization of ferrite grains transformed at relatively early stages of dynamic transformation.