Quantification of texture-induced ridging in ferritic stainless steels 430 and 430LR during tensile deformation

Ma, Xiaoguang; Zhao, Jingwei; Du, Wei; Zhang, Xin; Jiang, Laizhu; Jiang, Zhengyi

doi:10.1016/j.jmrt.2018.12.019

Cited by 22 publications

(7 citation statements)

References 25 publications

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“…The terms ‘roping’ and ‘ridging’ refer to the surface appearance of the material that shows rope-like features parallel to the prior rolling direction and distributed along the transverse direction. This phenomenon was observed in ferritic stainless steels [ 1 , 2 ] as well as aluminum alloys [ 3 , 4 ]. Both materials are often used for exterior applications whose surface appearance is important (e.g., automotive body applications).…”

Section: Introductionmentioning

confidence: 92%

Quantification of the Morphological Signature of Roping Based on Multiscale Analysis and Autocorrelation Function Description

2020

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Roping or ridging is a visual defect affecting the surface of ferritic stainless steels, assessed using visual inspection of the surfaces. The aim of this study was to quantify the morphological signature of roping to link roughness results with five levels of roping identified with visual inspection. First, the multiscale analysis of roughness showed that the texture aspect ratio Str computed with a low-pass filter of 32 µm gave a clear separation between the acceptable levels of roping and the non-acceptable levels (rejected sheets). To obtain a gradation description of roping instead of a binary description, a methodology based on the use of the autocorrelation function was created. It consisted of several steps: a low-pass filtering of the autocorrelation function at 150 µm, the segmentation of the autocorrelation into four stabilized portions, and finally, the computation of isotropy and the root-mean-square roughness Sq on the obtained quarters of function. The use of the isotropy combined with the root-mean-square roughness Sq led to a clear separation of the five levels of roping: the acceptable levels of roping corresponded to strong isotropy (values larger than 10%) coupled with low root-mean-square roughness Sq. Both methodologies can be used to quantitatively describe surface morphology of roping in order to improve our understanding of the roping phenomenon.

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Section: Introductionmentioning

confidence: 92%

Quantification of the Morphological Signature of Roping Based on Multiscale Analysis and Autocorrelation Function Description

2020

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“…To investigate the microstructural evolution of specimens with different rolling processes, the crystallographic orientations of grains inside FSS were obtained and analyzed on the basis of the orientation distribution functions (ODFs). It is known that FSS has a body-centered cubic (BCC) crystal structure, the microstructural evolution of FSS strips were analyzed based on ODFs inside the ϕ2 = 45°s ection of the Euler space [25].…”

Section: Materials and Experimental Proceduresmentioning

confidence: 99%

An analysis of microstructure and mechanical properties of ferritic stainless steel 430 during cold rolling and subsequent annealing

Sun

et al. 2022

Int J Adv Manuf Technol

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Systematic study on the microstructural evolution and mechanical properties of ferritic stainless steel (FSS) 430 with different annealing processes were carried out in the present work. The results show that microstructural re nement can be achieved by optimization of annealing processes, improving elongation, yield strength and tensile strength of FSS 430. An optimal annealing temperature of 950 ℃ is found with better homogeneity and enhanced mechanical properties among the cold-rolled and annealed FSSs. During annealing processes, the fraction of high angle grain boundaries of FSS 430 annealed at 950 ℃ is found to be the highest, indicating that a homogeneous microstructure with high recrystallization rate is formed inside the FSS 430 strips. In addition, high fraction of the hard grains (SF < 0.4) and low fraction of the soft grains are found inside FSS 430 annealed at 950 ℃, improving the plasticity of material. Overall, the optimization of annealing processes bene ts the microstructural re nement of FSS and thereby improving the mechanical properties of materials.

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“…Several studies have investigated the texture evolution of FSSs during forming processes using different techniques such as X-ray diffraction (XRD) [8][9][10][11][12], electron backscatter diffraction (EBSD), and scanning electron microscopy (SEM), [8][9][10][11][12][13][14][15][16][17][18] and only a small number of studies employed transmission electron microscopy (TEM) [13,19]. Some of these studies focused on cold-worked FSSs.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, Rodrigues et al [8] found that the grain size and initial texture had a significant influence on the texture development and the anisotropy of Nb-stabilised FSS manufactured using two-step cold rolling. Others studied the texture evolution to understand the ridging process that FSSs may experience during forming, like Ma et al [16], who found that this defect is avoided by preventing the formation of coarse bands and grains with the {001} component in 430 and 430 LR. However, most of these studies focused on the most popular standard grade of FSSs, AISI 430 [11,16], while others explored the texture evolution of modified grades with higher contents of Ti and Nb, which have improved corrosion resistance and weldability [8][9][10][13][14][15][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

A Combined Microscopy Study of the Microstructural Evolution of Ferritic Stainless Steel upon Deep Drawing: The Role of Alloy Composition

Núñez,

Collado,

De la Mata

et al. 2024

JMMP

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Ferritic stainless steel (FSS) is widely used to manufacture deep-drawn products for corrosion resistance applications, being the alloy drawability strongly affected by its microstructural anisotropy. This study combines a variety of microscopy techniques enabling in-depth analyses of the microstructural evolution of two different FSSs correlated to their deep drawing performance. One of the steels has a good correspondence with the standard EN-1.4016 (AISI 430). The other is a modified version of the previous one with higher contents of the ferrite-stabilising elements Si and Cr, and lower contents of the austenite-stabilising elements C, N, and Mn. Electron Backscatter Diffraction results confirm that the microstructural properties and drawability of FSS in the deep drawing process are improved in the modified steel version. Scanning transmission electron microscopy under low-angle annular dark field conditions evidences that the deformation mechanism of FSS during deep drawing follows a microstructural distortion model based on the grain size gradient and shows a variation of the deformation texture depending on the alloy composition. This work demonstrates the potential of advanced microscopy techniques for optimising the processing and design of ferritic stainless steels, with slight variations in the alloy composition, for deep drawing applications.

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Quantification of texture-induced ridging in ferritic stainless steels 430 and 430LR during tensile deformation

Cited by 22 publications

References 25 publications

Quantification of the Morphological Signature of Roping Based on Multiscale Analysis and Autocorrelation Function Description

Quantification of the Morphological Signature of Roping Based on Multiscale Analysis and Autocorrelation Function Description

An analysis of microstructure and mechanical properties of ferritic stainless steel 430 during cold rolling and subsequent annealing

A Combined Microscopy Study of the Microstructural Evolution of Ferritic Stainless Steel upon Deep Drawing: The Role of Alloy Composition

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