Texture development of strip cast ferritic stainless steel

Raabe, Dierk; Hölscher, M.; Dubke, Mathias; Hanke, Karl‐Heinz; Pfeifer, Herbert; Lücke, K.

doi:10.1002/srin.199301036

Cited by 28 publications

(19 citation statements)

References 6 publications

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“…6(b) and 6(d). In the work by Raabe and co-workers, 12) the uniform g-fiber recrystallization texture had also been found in the final sheets of cast strips. The orientation densities along g-fiber, however, were weaker (center layer: f(g) max ϭ5.4; sub-surface layer: f(g) max ϭ3.3) than those in the present work.…”

Section: Texture Developments In Columnar and Equiaxed Cast Stripsmentioning

confidence: 82%

“…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%

“…Raabe calculated r-values for the cold rolled and annealed sheets of cast strips from the first four Fourier coefficients of the harmonic ODF, and indicated that its high rvalue might be attributed to more homogeneous texture through sheet thickness than conventional cold rolled and annealed sheets. 12) In the present paper, the texture gradients through the sheet thickness were measured by EBSD, Figs. 8(a) and 8(b).…”

Section: Recrystallization Textures and R-values Of Thementioning

confidence: 99%

“…[6][7][8][9] Strip casting, a "near-net-shape" forming process to bypass hot rolling, is considered to be able to compete with sheet production with conventional continuous casting and thermo-mechanical processing. 10) Extensive work on texture development of strip cast stainless steels has been carried out by Raabe and co-workers, [11][12][13] which indicated that initial textures in the cast strip were nearly random and homogenous through thickness. The final cold rolled and annealed sheet of strip cast FSS was also shown to exhibit good deep drawability, and could avoid surface ridging phenomenon.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: Texture Developments In Columnar and Equiaxed Cast Stripsmentioning

confidence: 82%

Section: Methodsmentioning

confidence: 99%

Section: Recrystallization Textures and R-values Of Thementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Liu¹,

Liu²,

Guo-dong³

2009

ISIJ Int.

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“…The topic of this study is to investigate some main along the process chain, placing particular attention on the recrystallization mechanisms occurring during annealing [1,2]. The ferritic-martensitic microstructure is designed by intercritical annealing in the ferritic-austenitic two-phase regime and subsequent quenching [3][4][5][6][7][8]. During intercritical annealing a complex interplay between recovery, recrystallization, grain growth, and phase transformation occurs [3][4][5][6][7][8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Microstructure Evolution during Recrystallization in Dual-Phase Steels

Peranio

Roters

Raabe

2012

MSF

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The microstructure and texture of rolled and annealed dual-phase steels with 0.147 wt. % C, 1.868 wt. % Mn, and 0.403 wt. % Si were analyzed using SEM, EDX, and EBSD. Hot rolled sheets showed a ferritic-pearlitic microstructure with a pearlite volume fraction of about 40 % and ferrite grain size of about 6 µm. Ferrite and pearlite were heterogeneously distributed at the surface and distributed in bands at the center of the sheets. The hot rolled sheets revealed a through-thickness texture inhomogeneity with a plane-strain texture with strong α-fiber and γ-fiber at the center and a shear texture at the surface. After cold rolling, the ferrite grains showed elongated morphology and larger orientation gradients, the period of the ferrite-pearlite band structure at the center of the sheets was decreased, and the plane-strain texture components were strengthened in the entire sheet. Recrystallization, phase transformation, and the competition of both processes were of particular interest with respect to the annealing experiments. For this purpose, various annealing techniques were applied, i.e., annealing in salt bath, conductive annealing, and industrial hot-dip coating. The sheets were annealed in the ferritic, intercritical, and austenitic temperature regimes in a wide annealing time range including variation of heating and cooling rates.

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Fast, Physically‐Based Algorithms for Online Calculations of Texture and Anisotropy during Fabrication of Steel Sheets

Winning¹,

Raabe²

2010

Adv Eng Mater

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The crystallographic texture or respectively, crystalline orientation distribution, is an important property of polycrystalline materials. [1,2] The texture of any given polycrystalline material depends on its thermo-mechanical processing history. [3][4][5][6] For example a sample exposed to cold rolling and subsequent heat treatment would result in different texture than a similar sample exposed to warm rolling and subsequent heat treatment. [7,8] Texture influences the response of materials to different external boundary conditions like stress, corrosion, or fatigue. A well-known example is the earing phenomenon occurring during stretching and drawing operations of auto parts or can stock material. [9][10][11][12][13][14][15] The amount of rolling and annealing (in terms of time and temperature) determines the crystallographic texture and hence the position and amount of earing. [12,13,[15][16][17] This applies in particular to low carbon steels. Cold rolling of such steel sheets leads to pronounced textures. The problem of predicting texture and anisotropy has been studied for a long time using various models. The established models range from Taylor-type models [18][19][20][21][22] and self-consistent [23][24][25] to crystal-plasticity FEM [26][27][28][29][30] methods. The simple models, which are also easy to implement, predict qualitatively correct tendencies in the texture development. The more sophisticated methods show better match to expected textures albeit not necessarily exact. Advanced models, however, are more computationally demanding than simpler models. Also, various models exist for predicting curvature-driven coarsening phenomena such as grain or subgrain growth and stored-energy driven transformations such as recrystallization. Typical approaches are Johnson-Mehl-AvramiKolmogorov (JMAK) methods, Ginzburg-Landau-type phase field models, cellular automata, Potts-type Monte Carlo models, vertex models, or front tracking algorithms. [31][32][33][34][35][36][37] Only some of these methods are usually applied for predicting crystallographic textures. More specific, the applicability of the various models in the field of texture research depends on their respective capability to integrate constitutive details that describe the mobility and interface anisotropy. The most prominent ones in the texture community are the Potts model, cellular automata, statistical JMAK models, and phase field models.Because of the complex microstructures and their evolution paths it is up to now not possible to obtain fast and on-line simulations of texture and anisotropy in the course of multi-stage deformation-and heat treatment procedures. In the present paper a hybrid approach for the on-line texture and anisotropy simulation will be developed for the fabrication of low-alloyed ferritic steel thin sheets during multiple cold rolling and subsequent annealing procedures. Our approach is based on an algorithm for the simulation of COMMUNICATION [*] M. WinningBecause of the complex microstructures of crystalline materia...

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Texture development of strip cast ferritic stainless steel

Cited by 28 publications

References 6 publications

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

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

Microstructure Evolution during Recrystallization in Dual-Phase Steels

Fast, Physically‐Based Algorithms for Online Calculations of Texture and Anisotropy during Fabrication of Steel Sheets

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