Local Orientation Investigation on the Ridging Phenomenon in Fe 17% Cr Steel

Bethke, Klaus; Lücke, K.; Hölscher, M.

doi:10.4028/www.scientific.net/msf.157-162.1137

Cited by 27 publications

(15 citation statements)

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“…The assessment of the contribution of the inhomogeneity in the through-thickness strain and outof-plane shear to surface roughening suggests that the latter is more important in causing ridging in FSS. This conclusion is supported by analysis of the resulting surface profiles, which, in accord with earlier studies, [15,18,22] proved that variations in the F 32 shear are accountable for the corrugated surfaces typical of FSS sheets with ridging (Figures 2(b) and 12(b)). A local inhomogeneity in F 33 gives rise to a ribbed surface profile, in contrast (Figures 2(a) and 12(a)).…”

Section: Discussionsupporting

confidence: 87%

“…With the appearance of fully automated electron backscattered diffraction (EBSD), such effects can nowadays readily be examined, [14] and several research groups have found well-defined grain colonies, i.e., assemblies of grains having similar orientations, in FSS specimens prone to ridging. [13,[15][16][17][18] In the earlier literature, there were several attempts to model ridging in FSS on the basis of an orientation-dependent anisotropy of plastic deformation. Chao [1] and, later, Wright [2] attributed ridging to differences in the r-value between the main recrystallization texture components.…”

Section: Introductionmentioning

confidence: 99%

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Crystal-plasticity analysis of ridging in ferritic stainless steel sheets

Engler

Huh

Tomé

2005

Metall Mater Trans A

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The occurrence of ridging in ferritic stainless steel (FSS) sheets is caused by the collective deformation of bandlike clusters of grains with a similar crystallographic orientation. In this article, largescale (1.8 ϫ 3.6 mm) orientation maps obtained by electron backscattered diffraction (EBSD) are input into a viscoplastic self-consistent polycrystal plasticity model to analyze the strain anisotropy caused by the topographic arrangement of the recrystallization-texture orientations. Two versions of the ridging model were devised: (1) the local dispersion in strain-rate components is analyzed for the full EBSD map, and (2) narrow bands in the EBSD maps aligned parallel to the ridges on the sheet surface are considered, and the variation in macroscopic strain response from band to band is derived. The effects caused by spatial variations in through-thickness strains and in out-of-plane shears are compared and related to ridging. The model is applied to two sheets distinguished by different levels of ridging.

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Section: Discussionsupporting

confidence: 87%

Section: Introductionmentioning

confidence: 99%

Crystal-plasticity analysis of ridging in ferritic stainless steel sheets

Engler

Huh

Tomé

2005

Metall Mater Trans A

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“…2,3,6,9,13,14,[22][23][24] Recently, the local orientation of recrystallized ferritic stainless steel sheets has been investigated by EBSP (Electron Back Scattering Pattern), the grain colony bands elongated parallel to the rolling direction have been observed and the ridging profiles have been simulated. 28,29) Various methods have been proposed to reduce the grain colony bands and improve ridging. 10,12,17,[19][20][21][22][25][26][27] It is thought that controlling the cast structure [19][20][21] is a key technology.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2003

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“…4,5) Even using this technique, the presence of grain colonies or clusters proposed in the theoretical models has not been identified. [6][7][8] The aim of present study is to identify the grain colonies associated with ridging by investigating the evolution of microstructure and texture in ferritic stainless steels. The investigation has been extended from the as-cast state to the cold-rolled and final annealed condition by using EBSD and ODF analyses.…”

Section: Introductionmentioning

confidence: 99%

“…The current results may support Chao 1) and Wright 3) 's ridging mechanisms among the previously proposed models. [1][2][3][6][7][8] …”

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confidence: 99%

Evolution of Microstructure and Texture Associated with Ridging in Ferritic Stainless Steels.

et al. 2002

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The evolution of microstructure and texture in two ferritic stainless steels was investigated in order to identify the existence of grain colonies associated with ridging and their origin. Special attentions were placed upon examining how the columnar crystals with an initial [001]//ND orientation in continuously-cast slabs can affect the formation of the grain colonies or band structures in the cold-rolled sheet specimens. The rolling and recrystallization textures at each process stage were examined by the orientation distribution function (ODF). Micro-texture measurements using an electron back-scattered diffraction (EBSD) technique were carried out on the ND, RD, and TD section, respectively. The existence of grain colonies having both {001}͗110͘ and {112}͗110͘ orientations at the central region of the sheets was clearly identified. These orientations were caused by both the crystal rotation toward a-fibre texture, which is stable orientation during rolling and the suppressed recrystallization. The relation between the presence of grain colonies and ridging phenomena was discussed.KEY WORDS: microtexture; ridging; grain colony; EBSD; stainless steel. 30 scanning electron microscope permitted the automatic micro-texture analysis by the on-line interpretation of the electron back-scattered diffraction (EBSD) patterns. Texture measurements were also made with an automated pole figure goniometer using MoKa radiation. The X-ray diffraction data were obtained on the mid-thickness sections of the ND plane. Orientation distribution function (ODF) was obtained from (110), (200), and (211) three pole figures. For the evaluation of the degree of ridging, uniaxial tensile tests were performed at a strain rate of 10 mm/min and interrupted at a strain of 0.15. The surface roughness due to ridging was measured using a Surftest 501 (Series 178) manufactured by Mitutoyo surface measuring instrument. ResultsFigure 2 shows the microstructural variation observed on the mid-thickness of ND plane at each process stage of 409L and 430 steels. In 409L steel, the initial columnar structure was elongated upon rolling. The initial columnar structure was found to be remained in a band shape in HRA and CRA conditions (Figs. 2(b) and 2(c)). However, in the case of 430 steel, the band structure originated from the initial columnar structure was reduced significantly, as shown in Fig. 2(f), due to the existence of austenitic phase in the hot rolling stage.Texture evolution of the two steels was also examined at each process stage. Figure 3 shows the variation of fibre intensities measured on the ND plane of central layer depending on process stage of 409L and 430 steels. The difference in fibre intensities was pronounced in a-fibre between the two steels, while that of g-fibre was negligible. The a-fibre intensities of 409L steel were found greater in both HRA and CRA condition than those of 430 steel. The a-fibre intensities measured at the CRA condition were relatively low in comparison to those measured at the HRA condition in both ste...

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Local Orientation Investigation on the Ridging Phenomenon in Fe 17% Cr Steel

Cited by 27 publications

References 0 publications

Crystal-plasticity analysis of ridging in ferritic stainless steel sheets

Crystal-plasticity analysis of ridging in ferritic stainless steel sheets

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

Evolution of Microstructure and Texture Associated with Ridging in Ferritic Stainless Steels.

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