Effects of rolling processes on ridging generation of ferritic stainless steel

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

doi:10.1016/j.matchar.2018.01.031

Cited by 30 publications

(12 citation statements)

References 30 publications

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“…Shin et al [27] suggested that the ridging of ferritic stainless steel mainly resulted from different plastic deformations of the grains with different crystal orientations when subjected to tension, and the longitudinal alignment of grain clusters could also arouse the formation of a corrugated surface [28,29]. Moreover, Ma et al [30] also revealed that the grain refinement was effective in reducing the ridging height of ferritic stainless steel during the forming process. From this work, we can understand that the formability of ferritic stainless steel can be significantly improved as long as high intensity γ-fiber texture, refinement of microstructure and dispersed distribution of recrystallization grains with various orientations were developed after cold rolling and annealing.…”

Section: Mechanical Properties and Formabilitymentioning

confidence: 99%

Influence of Finish Rolling Temperature on Microstructure and Mechanical Properties of a 19Cr1.5Mo0.5 W Ferritic Stainless Steel

Liu

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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A 444-type heat-resistant ferritic stainless steel containing 0.05 wt% Ce (rare earth element) and 2 wt% (Mo + W) was adopted as an experimental material to study the effect of finish rolling temperature on microstructure and texture evolution as well as on mechanical properties and formability. The rolling processes contain hot rolling at two different finish rolling temperatures (860 °C and 770 °C) and annealing, cold rolling and subsequent annealing. It was found that the microstructures after hot rolling and annealing could be refined by lowering finish rolling temperature. The resultant microstructures after cold rolling and annealing were hereditarily refined. Lowering finish rolling temperature can weaken α-fiber texture in hotrolled or cold-rolled ferritic stainless steel strip, while γ-fiber texture in the final product was homogeneously strengthened. Additionally, enhanced mechanical property and formability in terms of strength and average plastic strain ratio could be obtained via decreasing finish rolling temperature.

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Section: Mechanical Properties and Formabilitymentioning

confidence: 99%

Influence of Finish Rolling Temperature on Microstructure and Mechanical Properties of a 19Cr1.5Mo0.5 W Ferritic Stainless Steel

Liu

et al. 2020

Acta Metall. Sin. (Engl. Lett.)

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“…In this sense, the desired γ-fibre texture associated with Fe-Cr steels occurs during recrystallization and is described by <111> parallel to Normal Direction (ND), thus resulting in good deep drawability and improved strength and toughness. On the other hand, α-fibre is a cold rolling texture component that transforms in such a way that <110> orientates parallel to the Rolling Direction (RD), hence reducing formability [12][13][14][15][16][17]. Additionally, the anisotropic behaviour of flat products can be evaluated using the Lankford coefficients, with high values of normal plastic anisotropy, rm, greater than one, and planar plastic anisotropy, ∆r, as close to zero as possible, being good indicators of Components that occur during the phase transformation of austenite to ferrite in the hot rolling process are {001} <100> Cube, {110} <112> Brass, {332} <113>, {112} <111> Copper and {113} <110>.…”

Section: Introductionmentioning

confidence: 99%

Transformation of the Microstructure of Fe-Cr Steel during Its Production

Núñez

Collado

Almagro

et al. 2021

Metals

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EN 1.4016 stainless steels combine good corrosion resistance with good formability and ductility. As such, their most popular applications are related to sheet forming. During re-crystallisation of Fe-Cr steels, deviations from the desired γ-fibre (gamma fibre, <111>||ND) texture promote a decrease in deep drawability. Additionally, α-fibre (alpha fibre, <110>||RD) has been found to be damaging to formability. In this study, an EN 1.4016 basic material and a modified one with optimised settings as regards to chemical composition and manufacturing process, in order to improve the formability properties, are characterised. The phase diagram, microstructure, Lankford coefficients and Electron Backscatter Diffraction (EBSD) (results confirm the evolution of texture during the processing of ferritic stainless steel. Texture is analysed by the interpretation of Orientation Distribution Function (ODF), using orientation density results for each sample obtained in the processing route. The cube ({001} <100>) and rotated cube ({001} <110>) textures dominate the crystal orientation from the slab until the intermediate annealing stage. After final annealing, there is a texture evolution in both materials; the γ-fibre component dominates the texture, which is much more intense in modified material supported by components that show good deep drawability, {554} <225>, and good transition from hot to cold rolling, {332} <113>. The modified composition and process material delivers a better re-crystallisation status and, therefore, the best drawability performance.

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“…Especially, for recent years, due to the promotion of application fields and amounts of usage, attentions have been increasingly focused on the surface ridging behavior of this kind of steel. [ 5–7 ]…”

Section: Introductionmentioning

confidence: 99%

“…[ 11,12 ] Ma et al found that using Steckel‐mill rolling in the hot rolling stage can reduce the ridging height by 20–30% as compared with the tandem rolling. [ 6 ] Simultaneously, using differential cold rolling speed and intermediate annealing are also effective. [ 7,13 ]…”

Section: Introductionmentioning

confidence: 99%

Crystal Plasticity Analysis of the Relation between Micro‐Texture and Surface Ridging for a 21%Cr Ferritic Stainless Steel

Zhang

et al. 2020

steel research int.

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As a nickel-saving stainless steel, ferritic stainless steel has excellent cost and recyclable advantages. However, it has some special properties, such as magnetism, low thermal expansion, excellent high-temperature oxidation resistance, high thermal conductivity, excellent creep resistance, not prone to stress corrosion cracking (SCC), easily cutting and forming, and so on. It is stated that ferritic stainless steel can also be used as an substitute for some carbon steels because of its special durable and low-maintenance advantages. [1] With high purification and alloying design, some ferritic stainless steel grades were developed recently to possess comparable corrosion resistance as AISI 304 or even AISI 316 austenitic stainless steels. [2,3] One problem that restricts the application of ferritic stainless steel is surface quality. After deep drawing or stretching, ferritic stainless steel sheet usually forms an undulation surface morphology, i.e., surface ridging. The deformed sheet displays a corrugated surface, with ridges on one side coinciding with troughs on the opposite side, deteriorating the surface quality, and increasing the polishing cost. [4] Some fluid or dirty chemicals would accumulate at the concave regions, resulting in a severe corrosion tendency. Especially, for recent years, due to the promotion of application fields and amounts of usage, attentions have been increasingly focused on the surface ridging behavior of this kind of steel. [5-7] Surface ridging is normally supposed to be generated by the different plastic deformation responses occurring for the grains with different crystal orientations. Ferritic stainless steel composes a single phase steel when the Cr content is higher than 17 wt%; i.e., no phase transformation occurs at high temperatures. Thus, the solidification structure with columnar and big grains can only be refined through deformation and recrystallization during hot/cold rolling and annealing processes to some extent. As a result, ferritic stainless steel often exhibits intense recrystallization texture after final annealing. [8,9] Meanwhile, the crystallographic orientations distribute inhomogeneously in mesoscale, because they are evolved from the grains with different initial orientations. Sinclair et al. (2003) reported that some columnar grains with <001>//normal direction (ND) orientations possess low Schmid factors and store less energy for subsequent recrystallization process, resulting in texture inhomogeneity. [10] These micro-textures would cause heterogeneous distributed strains in mesoscale during deformation, leading to the formation of surface ridging. Numerous researches have been devoted to improve the surface quality through optimizing the processing technology. For example, Lee et al. recently reported a method that reducing the grain size of as-cast state by increasing nitrogen can reduce the surface

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Effects of rolling processes on ridging generation of ferritic stainless steel

Cited by 30 publications

References 30 publications

Influence of Finish Rolling Temperature on Microstructure and Mechanical Properties of a 19Cr1.5Mo0.5 W Ferritic Stainless Steel

Influence of Finish Rolling Temperature on Microstructure and Mechanical Properties of a 19Cr1.5Mo0.5 W Ferritic Stainless Steel

Transformation of the Microstructure of Fe-Cr Steel during Its Production

Crystal Plasticity Analysis of the Relation between Micro‐Texture and Surface Ridging for a 21%Cr Ferritic Stainless Steel

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