Development of Recrystallization Texture in Severely Cold-rolled Pure Iron

Abstract

緒言The mechanism of recrystallization texture development is changed by the chemical composition of materials, cold-rolling reduction, and annealing treatment conditions. In this paper, we have discussed the development of the recrystallization texture for cold-rolled iron with 99.8% reduction.In cold-rolled iron with 99.8% reduction, the deformation texture was a strong α-fiber (RD//<110>) with high strain. During annealing in a temperature range from 200 to 800˚C, in this highly strained α-fiber, the microstructure started to recover from quite a low temperature. Then recrystallized grains began to appear at 350˚C, and many recrystallized grains were generated at rather random locations. Their textural components were {100}, {211}, {111}, and {411}, which were included in the α-fiber. At 550˚C, recrystallization was completed, and the texture after full recrystallization was similar to that of the cold-rolled iron. This texture developed by unique microstructural changes, which could be classified into continuous recrystallization. The recrystallization texture: α-fiber was changed into the {100}<012> component by selective growth of recrystallized grains following the completion of recrystallization.

Advances in research on deformation and recrystallization for the development of high-functional steels

“…First, the initial subgrain structure was constructed using EBSD data for 90% and 99.8% severely cold-rolled pure Fe (Figures 13(a) and 14(a)). The simulated results for recrystallization qualitatively reproduced the experimental ones in the 90% case in that recrystallization occurred in a pattern of nucleation and growth, and that the ND//<111> recrystallization texture developed (Figures 13 and 15(c,d)) [41]. When the cold-rolling reduction of pure Fe increased from 90% to 99.8%, continuous recrystallization-like behavior was also recognized by the PF simulation which reproduces the experimental results ( Figures 14 and 15(g,h)).…”

“…The simulated results for the 99.8% cold-rolling reduction revealed that the cold-rolling texture remains unchanged even when recrystallization is complete (Figure 15(e,g)), which is in accordance with the experimental results ( Figure 15(f,h)). Concerning the development of recrystallization texture after heavy cold-rolling, it has been reported that~{411} <148> texture develops in Fe-0.3Si alloy [42], ultralow C steel [43] and Fe-3.2Si alloy [44]; however, this tendency is different from that of pure Fe [41] and Fe-0.3Al alloy [42]. This implies that alloying elements significantly affect recrystallization behavior and texture formation.…”

“…(c) Simulated [40] and (d) experimentally determined [41] 90% cold-rolled and subsequently recrystallized Fe. (e) Converted[40] and (f) experimentally determined 99.8% cold-rolled Fe[41]. (g) Simulated[40] and (h) experimentally determined 99.8% cold-rolled and subsequently recrystallized Fe[41].…”

Recrystallization Behavior and Texture Evolution in Severely Cold-rolled Fe-0.3Mass%Si and Fe-0.3Mass%Al Alloys

“…Change in Vickers hardness as a function of annealing temperature for cold-rolled Fe-0.3%Si alloy, Fe-0.3%Al alloy and pure iron6) with reduction 99.8%.…”

Role of Nb on Microstructural Evolution during Intercritical Annealing in Low-carbon Steels

“…9 were not necessarily smaller than other grains with different orientations. In previous reports, 22,23) non-recrystallized α grains with RD// < 110 > in mild steels were consumed by recrystallized α grains with ND// < 111 > before the nucleation of recrystallized α grains with RD// < 110 > . Thus, it is unusual that the formation of subgrains with RD// < 110 > and ND// < 111 > occurs simultaneously during annealing, as confirmed in the present study.…”