Recrystallization and Texture in a Ferritic Stainless Steel: an EBSD Study

Sinclair, Chad W.; Robaut, F.; Maniguet, Laurent; Mithieux, Jean‐Denis; Schmitt, Jean-Hubert; Bréchet, Y.

doi:10.1002/adem.200300377

Cited by 40 publications

(39 citation statements)

References 14 publications

(11 reference statements)

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“…[13,14] Various explanations have been forwarded to aid in explaining this phenomenon, most being based on the inhomogeneity of the cold-rolled microstructure. [7,8,10,12,[15][16][17][18][19] It is generally agreed that the slow approach to final recrystallization is attributable to the low stored energy and rapid recovery in deformed grains with orientations near {001}Ͻ110Ͼ. [11] Thus, while new grains may form and grow in grains with other orientations, it is observed that deformed grains with near {001}Ͻ110Ͼ orientations are the last to be removed from the microstructure.…”

Section: Introductionmentioning

confidence: 99%

Recrystallization of stabilized ferritic stainless steel sheet

Sinclair

Mithieux²,

Schmitt

et al. 2005

Metall Mater Trans A

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An experimental study of the microstructural evolution attending recrystallization of cold-rolled Ti-stabilized ferritic stainless steel is presented. Particular attention is paid to the slow approach to full recrystallization. It is shown that this "sluggish" recrystallization can be attributed to the heterogeneity of microstructure and texture resulting from the processing of the material. In particular, it is shown that the presence of fine Ti(C,N) precipitates acts to significantly hinder the final approach to full recrystallization.

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Section: Introductionmentioning

confidence: 99%

Recrystallization of stabilized ferritic stainless steel sheet

Sinclair

Mithieux²,

Schmitt

et al. 2005

Metall Mater Trans A

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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%

“…Figure 10 shows the EBSD characterization of the cold rolled sheet of equi-axed cast strip after annealing at 860°C for 10 s. It can be seen that the cold rolled structure consisted of alternative bands of a and g-fiber deformed grains. During cold rolling, it is believed that crystals along initial grain boundaries rotate preferentially to ͗111͘//ND, accompanied by a remarkable increase of misorientation 17) and dislocation density. 30) In this work, similar observation has been obtained, as shown in Fig.…”

Section: Texture Developments In Columnar and Equiaxed Cast Stripsmentioning

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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“…Failures in ferritic stainless steel conformation are known to be related to problems of structural homogeneity caused by the remaining primary solidification structure in the final product [1][2][3][4]. However, recent investigations have revealed that such failures could also be due to chemical segregation [5,6].…”

Section: Introductionmentioning

confidence: 99%

“…It is also necessary to establish the deformation mechanisms of this 3 To whom any correspondence should be addressed. In this study, four AISI 430 (EN 1.4016) steel samples, of different composition, were subjected to uni-and bi-axial tension deformation.…”

Section: Introductionmentioning

confidence: 99%