Dynamic recrystallization of ferrite in a low carbon steel during hot rolling in the (F+A) two-phase range

Effect of Undercooling of Austenite on Strain Induced Ferrite Transformation Behavior.

“…This phenomenon could be explained by dynamic continuous recrystallization of ferrite after transformation. Wang and Lei 18) reported that the misorientation across sub-boundaries of ferrite increased continu- ously with strain until the sub-boundaries were changed into high angle boundaries during the hot deformation (85 % reduction) at strain rate of 10 s Ϫ1 and at 800°C (Zϭ4.3ϫ10 14 s…”

“…Grain refinement during the hot deformation could be attained either by discontinuous recrystallization or by continuous recrystallization. [18][19][20][21][22][23] Hot deformation of metallic materials with low stacking fault energy such as austenite leads to the formation of new grain structure, that is, the occurrence of dynamic discontinuous recrystallization (DRX). On the other hand, it is generally considered that dynamic recovery is the main restoration of ferrite phase with high stacking fault energy rather than DRX.…”

“…The dynamic continuous recrystallization was mainly caused by absorption of dislocation into the sub-boundary of ferrite constrained by a/g boundaries in two phase structure. 18) The phase boundary between strain induced ferrite and austenite played an important role to enhance the dynamic continuous recrystallization. Thus, further grain refinement via dynamic continuous recrystallization took place by relatively low strain of 70 % reduction.…”

Dynamic recrystallization of ferrite in a low-carbon steel

“…However, since the 1970s, dynamic recrystallization (DRX) of ferrite has been found to occur in highly pure irons, [2,3] interstitial-free (IF) steels, [4,5,6] ferritic stainless steels, [7,8,9] and low-carbon steels, which deformed in the (F ϩ A) twophase range. [10,11,12] Further, in our study of deformationenhanced transformation of austenite to ferrite in a low-carbon steel, [13] it was found that the occurrence of DRX of ferrite led to the further refinement of ferrite grains after the transformation of austenite to ferrite.…”

“…The process described previously is a typical continuous DRX (CDRX) process described in a ferritic stainless steel [8] and low-carbon steels deformed in the (F ϩ A) two-phase region, [10,11,12] the characteristic of which is that the stressstrain curve is nearly flat although a slight decrease after the peak stress strain leads to the formation of substructures. With increasing strain, substructures develop continually, leading to the rotation and coalescence of subgrains.…”