Effect of precipitate dispersion on recrystallization texture of niobium-added extra-low carbon cold-rolled steel sheet.

Abstract

The effect of precipitate dispersion on the development of annealing texture in an interstitial free steel was investigated using a Nb-added extra-low C steel. Size and dispersion o f precipitates in a Nb-added extra-low C steel was widely changed using the same steel and keeping the grain size similar. Strong {111} recrystallization texture was developed in the specimen with coarse and sparse precipitates, but not in the specimen with fine and dense precipitates. Solute C dissolved from fine precipitates after cold rolling and during heating exists at the recovery stage and at the beginning of recrystallization in the specimen with fine and dense precipitates, but this effect cannot be considered as an important factor because of little change in {11O} texture. However, independent o f precipitate dispersion, {111} recrystallized grains recover faster than {100} oriented grains and { 111 } recrystallized grains nucleate in situ in the deformed matrices. Fine and dense precipitates strongly suppress the growth o f recrystallized grain, and results in a decrease in {111} texture. Therefore a pinning effect of precipitates for grain boundary moving during recrystallization is considered to be the most important factor controlling the recrystallization texture in an interstitial free steel. Research Article (737)

Precipitation behavior in ultra-low-carbon steels containing titanium and niobium

“…In other words, the precipitation behaviors in these two types of steel were thought to be similar, if not identical, except for the amount of precipitates formed. [8][9][10][11][12][13][14][15][16][17][18][19] The precipitation sequence has been speculated to be TiN, TiS, Ti 4 C 2 S 2 , and TiC, as the temperature decreases. For example, in Ti and/or Nb microalloyed steels of typical S, C, and N contents (atomic ratio S:C:N Ϸ 1:10:10), the major C-bearing precipitates are free-standing carbonitride (MCN) particles that are formed by the classic nucleation and growth process.…”

Effect of Chemical Composition and Thermomechanical Processing on Texture in Hot Bands of Ti and Ti+Nb Containing Ultra-low Carbon Steels

“…The effect of Nb-and Ti-bearing precipitates on texture has been studied by many researchers who have emphasized the effect of these precipitates on recrystallization and grain growth. [18][19][20][21] Especially Nb precipitation can inhibit the recrystallization of austenite during hot rolling and lead to sharp rolling textures in austenite.…”

Precipitation and Recrystallization Behavior in Extra Low Carbon Steels.

“…The grain size, precipitate size and distribution, and the residual solute content were reported as important hot band parameters, influencing the recrystallization behavior of IF steels. 8,9) Steels A and B have a similar hot band grain size. The rest of parameters such as the solute Ti content or the precipitate size and distribution are expected to be responsible for the differences in the recrystallization behavior of the two steels.…”