Microstructure, Texture, and Deep Drawability Under Two Different Cold-Rolling Processes in Ferritic Stainless Steel

Abstract

In the present study, the through-thickness texture evolution and grain colony distribution in ferritic stainless steel under two different cold-rolling processes have been investigated with the aim to enhance deep drawability. It was shown that in the case of conventional cold-rolling process, at the surface, midthickness between the surface and the center, and center layers, all the textures consisted of very sharp afiber and weak c-fiber with a peak at {111}AE110ae after cold rolling, and non-uniform c-fiber recrystallization textures were formed after final annealing. In case of two-step cold-rolling process, by contrast, all the textures were dominated by sharp a-fiber and weak c-fiber after cold rolling to 50% reduction, and {111}AE112ae became the prominent component after subsequent annealing. The a-fiber and c-fiber with a peak at {111}AE112ae were intensified after cold rolling to 60% reduction, resulting in the formation of uniform c-fiber recrystallization textures after final annealing. Furthermore, after two-step cold-rolling process, the final sheet exhibited a more homogeneous distribution of grain colonies. Therefore, the deep drawability of final sheet was significantly improved after two-step cold-rolling process. It was elucidated that the selective growth mechanism was responsible for the characteristics of c-fiber recrystallization texture under conventional cold-rolling process, whereas c-fiber recrystallization texture development was controlled by the oriented nucleation mechanism in the two-step cold-rolling process.

Ordered Structure, Dislocation, and Grain Boundary Character Distribution and Their Effects on Warm Deformation in Soft‐Magnetic Fe–6.9Si–0.01B Alloy

“…Due to the segregation of γ‐fiber and α‐fiber textures, a high adjacent probability for γ‐fiber and α‐fiber texture orientations provides more opportunities for occurring large fraction of CSL boundaries. [ 18 ]…”

Evaluation of Intermediate Annealing on Nb-Stabilized Ferritic Stainless Steel

“…2) favored the formation of the {111}〈112〉 components after annealing. According to Gao et al 19 , the weak texture after cold rolling is unfavorable for the intensification of the recrystallization texture. Thus, it could be concluded that the stronger texture after 80% of reduction improved the γ-fiber intensity.…”

Texture Evolution, Formability and Ridging Resistance of a Sn-bearing Ferritic Stainless Steel Under Different Hot Band Annealing Temperatures

“…Figure 11 shows the formability for Sn-bearing ferritic stainless steel with different HBA temperatures. The average plastic strain ratio (r) and earring coefficient (Δr) are important indexes in evaluating the formability of ferritic stainless steels [24,25], and these parameters are determined in our present study so as to assess the formability of our experimental steel. As shown in the figure, the average r value increases first and then decreases with the rising HBA temperature, and it reaches a maximum of 1.71 when HBA temperature is 950 °C.…”

“…The Δr value also has a close relationship with crystallographic texture, and distinct orientations have distinct Δr values. In body-centered cubic (bcc) metals, {111} <110> and {111} <112> orientations have a small Δr value, while {001} <110> and{112} <110> orientations possess a larger Δr value [25]. Combining with the ODFs of the final sheets, the {111} <112> recrystallization texture slightly increases first and then significantly decreases with the rising HBA temperature, and the texture intensity reaches a maximum when it is at 950 °C.…”