Patterns of Recrystallization in Warm- and Hot-Deformed AA6022

ND//<111> Recrystallization in Interstitial Free Steel: The Defining Role of Growth Inhibition

“…Equation (5) is purely geometrical, but Ni can provide numerical estimates of preferred nucleation. 18,22,25,47) Nis for It needs to be noted that past studies 43) had shown that changes in texture estimated r-bar scales well with conventional mechanically tested r-bar values. 2 Similarly, the estimated increase in θ frequency/size advantage should correlate with the changes in the recrystallized θ -fibre volume fraction.…”

“…As the separation between deformed γ -fibre bands (λ i )) reduces 3 , even with the same magnitude of nucleation factor an increase in recrystallized γ -texture is expected. 18,22,25,47) This was not the case: see (Fig. 6(b)), while frequency advantage actually increased.…”

“…The frequency advantage or preferred nucleation can be further quantified through the so-called 'Nucleation Factor'. 18,22,25,47) This concept was originally proposed in a study on cube recrystallization in fcc aluminium, 25) and subsequently extended 18) to bcc LC steel. It was proposed that a recrystallization texture of a component 'i' can be seen as: (5) where Ai, di and λ ι are the respective area fraction, average recrystallized grain size and deformed band separation for 'i' orientation: all estimated along ND in a long transverse plane (containing RD and ND).…”

“…(1). For automated grain classification 22,23) the presence of a continuous boundary above 5° misorientation was used: the relatively small misorientation criterion was essential to bring out subtle differences in frequency and size advantages. 10,19) on the boundary mobility is expected to be even more dominating in growth inhibition.…”

“…2,[4][5][6][7][9][10][11]20,21) A recrystallized grain can be distinguished from rest of the deformed matrix by its strain-free nature and a minimum size. 10,19,22,23) This is the only way to distinguish a recrystallized grain from a large sub-grain. 10) The 'minimum' size criterion, on the other hand, brings an interesting contradiction.…”