Effect of Initial Orientation on the Recrystallization Behavior of Solidified Columnar Crystals in a 19% Cr Ferritic Stainless Steel.

Tsuji, Nobuhiro; Tsuzaki, Kaneaki; Maki, Tadashi

doi:10.2355/isijinternational.33.783

Cited by 48 publications

(18 citation statements)

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“…The columnar grain specimen still had strong {001}͗110͘ after annealing, and it seems to be caused that the grains with {001}͗110͘ orientation are very hard to recrystallize during annealing. 32,33) Thus, it is concluded that the textures in the hot-rolling and annealing process depend on the initial orientation and this is similar to the results obtained by Tsuji et al [31][32][33] The ridging phenomenon has been explained by the anisotropic plastic flow due to the orientational colonies in the final grain structure. 2,3,6,9,13,14,[22][23][24] Figure 11 showed that the columnar grain specimen with annealing after hot rolling had the grain colonies with {001}͗110͘ and {112}͗110͘ which would have relatively low plastic strain ratio compared to that of ͗111͘//ND.…”

Section: Relationship Between Ridging and Texturesupporting

confidence: 78%

“…The present results were similar to the results of cold rolling and recrystallization behaviors in a 19 % Cr ferritic stainless steel with an a-single phase. [31][32][33] …”

Section: Methodsmentioning

confidence: 99%

“…Tsuji et al [31][32][33] studied the effect of initial orientation on the cold rolling and recrystallization behavior in 19 % Cr ferritic stainless steel with columnar crystals. It was suggested that columnar crystals show a lower recrystallization rate than equiaxed crystals, and the {001}͗uv0͘ initiallyorientated columnar grains may be technologically unfavorable for ridging.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Initial Solidified Structure on Ridging Phenomenon and Texture in Type 430 Ferritic Stainless Steel Sheets

et al. 2003

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Section: Relationship Between Ridging and Texturesupporting

confidence: 78%

“…The present results were similar to the results of cold rolling and recrystallization behaviors in a 19 % Cr ferritic stainless steel with an a-single phase. [31][32][33] …”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of Initial Solidified Structure on Ridging Phenomenon and Texture in Type 430 Ferritic Stainless Steel Sheets

et al. 2003

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“…6(a). This is in good agreement with the result of Tsuji et al [1][2][3][4] that the {001}͗010͘ oriented grains were difficult to rotate and maintained their initial orientation during cold rolling. Figure 9 shows the EBSD characterization of the microstructure in ND plane of the cold rolled columnar cast strip with a reduction of 80 %.…”

supporting

confidence: 82%

“…However, the continuous cast slabs usually contain developed columnar grains with strong ͗001͘ texture parallel to the normal direction (ND), which leads to {001}͗110͘ and {001}͗010͘ textures in the hot rolled bands and cold rolled sheets. [1][2][3][4][5][6][7] Furthermore, unlike in low carbon steel, FSS undergoes no or merely limited gamma-to-alpha phase transformation and recrystallization during hot rolling. Accordingly, the hot bands of FSS usually display pronounced textures and strong through-thickness gradients in both microstructure and texture, which deteriorates the deep drawability and surface quality of final cold rolled and annealed sheets.…”

Section: Introductionmentioning

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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Combined Processing of ECAP and Cold Rolling to Enhance the Performance of Metallic Materials

Miyamoto¹,

Xiao²,

Uenoya³

2011

Supplemental Proceedings

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Effect of Initial Orientation on the Recrystallization Behavior of Solidified Columnar Crystals in a 19% Cr Ferritic Stainless Steel.

Cited by 48 publications

References 1 publication

Effect of Initial Solidified Structure on Ridging Phenomenon and Texture in Type 430 Ferritic Stainless Steel Sheets

Effect of Initial Solidified Structure on Ridging Phenomenon and Texture in Type 430 Ferritic Stainless Steel Sheets

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

Combined Processing of ECAP and Cold Rolling to Enhance the Performance of Metallic Materials

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