Recrystallization of stabilized ferritic stainless steel sheet

Sinclair, Chad W.; Mithieux, Jean‐Denis; Schmitt, Jean-Hubert; Bréchet, Y.

doi:10.1007/s11661-005-0091-6

Cited by 52 publications

(41 citation statements)

References 27 publications

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“…The slowing down of SRX kinetics towards the completion of the recrystallization process in ferritic stainless steels has been previously reported by the present authors 18) and also by Sinclair et al 19) At 1 223 K, DRV is intense as evident from the flow stress curves in Fig. 1(a), and therefore it effectively reduces the stored energy and therefore also the driving force for SRX.…”

Section: Microstructure and Texture Evolutionsupporting

confidence: 84%

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: Microstructure and Texture Evolutionsupporting

confidence: 84%

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

et al. 2014

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“…This shift has been observed for ferritic steel sheets with 90% cold rolling reduction. 14,40) Figure 15 shows the changes in orientation density along {h,1,1}<1/h,1,2> fiber in the surface and center layers of Type 436L sheets annealed at 950°C with Type A and C cold rolling textures. Although in Type A the difference of the intensities of {h,1,1}<1/h,1,2> orientations in the surface and center layers are small, the dependence of the intensity on the location in Type C is large in comparison with Type A.…”

Section: Effect Of Through-thickness Texture Gradientmentioning

confidence: 99%

“…Relation between the average r-value and the limiting drawing ratio for sheets of various ferritic stainless steels with a thickness of 0.5-0.9 mm. © 2011 ISIJ effects of cold rolling reduction and precipitation, 9,10,13,14) no detailed study has been made on the quantitative understanding of its contribution to the r-value.…”

Section: Introductionmentioning

confidence: 99%

Effect of Texture on r-value of Ferritic Stainless Steel Sheets

2011

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The effects of cold rolling texture on the formation of recrystallization texture and the relationship between recrystallization texture and r-value were investigated for sheets of titanium-stabilized extra-high purity Type 436L and Type 409L ferritic stainless steels. The recrystallization texture and average r-value were affected by the cold rolling texture. Annealed sheets with a sharp γ-fiber texture and very high average r-values were obtained from cold-rolled sheets with a strong γ-fiber texture (Type A). On the other hand, the {h,1,1}<1/h,1,2> fiber texture developed from cold-rolled sheets with a strong α-fiber texture (Type C). In terms of the relationship between {111} intensity and the average r-value, chromium content had less effect than the cold rolling texture. The planar anisotropies of r-values and the average r-values of Type 436L and 409L sheets with Type A cold rolling textures agreed well with those calculated from the textures in the center layers by using the relaxed-constraints model and the CRSS ratio τc{211}/τc{110} of 1.1. On the other hand, for the sheets with Type C cold rolling textures and a marked texture gradient, it was necessary to consider the texture gradient in the thickness direction. The texture inhomogeneity by the orientations other than {111} texture affected the relationship between {111} intensity and average rvalue.

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“…4(c) and 4(f), which could lead to a reduction in rvalue. 7,12,[16][17][18][19][20] However, the {001}͗110͘ component, which is deleterious to r-value, was not completely removed. It can be seen that the densities of the recrystallization texture in cold rolled and annealed sheet of equi-axed bar was a bit greater than those of the columnar bar.…”

Section: Methodsmentioning

confidence: 99%

“…[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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Recrystallization of stabilized ferritic stainless steel sheet

Cited by 52 publications

References 27 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

Effect of Texture on r-value of Ferritic Stainless Steel Sheets

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

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