Development of ferritic stainless steel sheets with excellent deep drawability by ?111? recrystallization texture control

Yazawa, Yoshihiro; Ozaki, Yoshihiro; Kato, Yasushi; Furukimi, Osamu

doi:10.1016/s0389-4304(03)00082-1

Cited by 82 publications

(45 citation statements)

References 6 publications

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“…Unfortunately, the high-chromium ferritic stainless steels may develop an undesirable surface defect in deep drawing known as roping and the appearance of which is closely related to the texture of the steel, e.g. 1,2) The composition of the stabilized high-chromium ferritic stainless steels is such that the austenite -ferrite phase transformation, which would affect the texture, does not occur. Therefore, in the course of hot rolling, the texture of the hot band can only be changed from the solidification texture, which is generally considered harmful, by deformation and recrystallization.…”

Section: Introductionmentioning

confidence: 99%

Microstructural and Texture Development during Multi-Pass Hot Deformation of a Stabilized High-Chromium Ferritic Stainless Steel

et al. 2014

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With the ultimate target of improving the deep drawability of a dual-stabilized 21%Cr ferritic stainless steel, the evolution of the flow stress, microstructure, texture, dislocation structures and precipitation during multi-pass hot deformation were studied. Plane strain compression in three passes with 0.4 -0.5 pass strains and 20 s inter-pass times was employed together with scanning electron microscopy combined with electron backscatter diffraction (SEM-EBSD) and transmission electron microscopy (TEM). The temperature of the final pass was varied between 1 223 K and 923 K and the final cooling took place either by water quenching to room temperature or water cooling to 923 K followed by cooling at 0.33 K/s to room temperature. At 1 223 K, static recrystallization was almost complete during the 20 s inter-pass times and this randomized the texture. When the deformation temperature was lowered to 1 073 K or 923 K, in-grain shear bands were formed in the grains belonging to the γ fibre. The deformation temperature of the third pass had only a minor effect on the deformation texture intensity maxima. The final dislocation structure was not changed by the cooling rate from 923 K, but slow cooling enabled precipitation to occur. The results indicate that although the deformation conditions affect the deformed microstructures and dislocation structures, the effect of the deformation temperature on the texture was insignificant.

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Section: Introductionmentioning

confidence: 99%

Microstructural and Texture Development during Multi-Pass Hot Deformation of a Stabilized High-Chromium Ferritic Stainless Steel

et al. 2014

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“…Yazawa et al 11 reported that the r ̅ value is related to the γ-fiber in the recrystallization texture. Furthermore, the enhancement and uniformity of the γ-fiber is essential in order to improve the r ̅ value [10][11][12] .…”

Section: Discussionmentioning

confidence: 99%

“…Huh and Engler 7 cited that an improvement in formability can be obtained by controlling the crystallographic texture. Control methods for the improvement of the γ-fiber recrystallization texture have been attempted by some approaches, such as refinement of the hot rolled microstructure, annealing of the hot rolled bands, optimization of cold rolling, intermediate annealing in cold rolling, and reduction of carbon in a solid solution [10][11][12] .…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Intermediate Annealing on Nb-Stabilized Ferritic Stainless Steel

Rodrigues

Alcântara²,

Oliveira³

et al. 2017

Mat. Res.

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This study seeks to evaluate the effect of intermediate annealing on the microstructure, texture, and formability of Nb-stabilized ferritic stainless steel. Two routes -direct cold rolling and cold rolling with an intermediate annealing were performed. The total reduction was 80%, 3-0.6 mm and 3-1.2-0.6 mm. The characterization of the samples was conducted using X-ray diffraction, electron backscatter diffraction, and tensile tests to evaluate the formability by the average normal anisotropy coefficient, r ̅ value. The results showed that intermediate annealing promoted the strongest γ-fiber with peak at {111}〈112〉 and weak α-fiber after cold rolling. After the final annealing, it was observed that intermediate annealing reduces the banded microstructure and θ-fiber, and improves the γ-fiber uniformity and the r ̅ value. It is worth noting that the γ-fiber fraction was the same for direct reduction. The increase in r ̅ value was related to the reduction in θ-fiber and the uniformity of texture recrystallization.

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“…[5][6][7]16,[21][22][23] During hot rolling, FSS undergo no or merely phase transformation and rapid recovery occurs instead of recrystallization. Hence, strong {001}͗110͘ component can be easily formed in the center layer of hot rolled band due to easy crystal rotation toward stable orientation during rolling.…”

Section: Texture Developments During Conventional Processingmentioning

confidence: 99%

Texture Development and Formability of Strip Cast 17% Cr Ferritic Stainless Steel

Liu¹,

Liu²,

Guo-dong³

2009

ISIJ Int.

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In order to optimize the formability of ferritic stainless steel (FSS), control of the crystallographic texture is essential. In the present work, texture development of cast strips with different initial solidification structure during rolling and subsequent annealing and the formability of final sheets were investigated. Fully equiaxed and columnar grained cast strips of Fe17%Cr FSS were fabricated by a pilot twin-roll strip caster. The equi-axed and columnar grained bars cut from a conventional continuous cast slab were used as comparable specimens. It was shown that in the cold rolled and annealed sheet of fully equi-axed cast strip, uniform and strong g-fiber recrystallization texture was formed and {001}͗110͘ component was almost eliminated. By contrast, the recrystallization texture in the conventional sheets with equi-axed and columnar initial solidification structures exhibited typical shift towards high-index {334}͗483͘, which led to a reduced r-value as compared to that of the equi-axed cast strip. The final annealed sheet of fully columnar cast strip, however, showed weaker g-fiber recrystallization texture and lower r-value than those of conventional sheets. It is, therefore, believed that twin-roll strip casting can improve the formability of 17 % Cr FSS only under the precondition that appropriate solidification structure is obtained.KEY WORDS: ferritic stainless steel; twin-roll strip casting; solidification structure; texture; formability. ent strips in cold rolling and annealing were studied. Equiaxed and columnar bars were cut from a continuous cast slab, and hot rolling, hot band annealing, cold rolling and final recrystallization annealing were performed for both bars to simulate the industrial processes. The texture developments of the two bars were also studied and compared with those of cast strips to understand the evolutions of microstructure, texture and properties in the cast strips. Experimental ProceduresFe17%Cr FSS with a composition of Cr, 16.9; Ni, 0.114; C, 0.03; Mn, 0.154; Si, 0.243; P, 0.016; S, 0.004 (in mass%) was used. Cast strips were produced by using a pilot twinroll strip caster, in which the molten steel was poured into a preheated tundish under Ar shield to flow through a nozzle into the rotated water-cooled rolls.15) The casting speed was set up to be 0.25 m/s and the initial roll gap was set to be 1.5 mm to produce strips with thickness of about 1.8 mm. The pool melt temperature was measured by a thermo-detector installed above the melting pool. In the present work, pool melt superheats were controlled to be about 140 K and 20 K, respectively, to produce fully columnar and fully equi-axed cast strips, Fig. 1. The average diameters of columnar and equi-axed grains were about 400 mm and 200 mm, respectively. Both strips were cold rolled by using a laboratory rolling mill with a thickness reduction of 80 %, and were annealed at 860°C for 2 min.Columnar and equi-axed bars in the size of 250 Lϫ 110 Wϫ45 T (mm) were cut from a cast slab of Cr17 FSS, Fig. 2. The average...

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Development of ferritic stainless steel sheets with excellent deep drawability by ?111? recrystallization texture control

Cited by 82 publications

References 6 publications

Microstructural and Texture Development during Multi-Pass Hot Deformation of a Stabilized High-Chromium Ferritic Stainless Steel

Microstructural and Texture Development during Multi-Pass Hot Deformation of a Stabilized High-Chromium Ferritic Stainless Steel

Evaluation of Intermediate Annealing on Nb-Stabilized Ferritic Stainless Steel

Texture Development and Formability of Strip Cast 17% Cr Ferritic Stainless Steel

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