Quasi in-situ analysis of geometrically necessary dislocation density in α-fibre and γ-fibre during static recrystallization in cold-rolled low-carbon Ti-V bearing microalloyed steel

Kapoor, Ishwar; Lan, Ya‐Qian; Rijkenberg, Arjan; Li, Zushu; Janík, Vít

doi:10.1016/j.matchar.2018.09.032

Cited by 22 publications

(13 citation statements)

References 62 publications

(115 reference statements)

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“…The main reason is that the deformation energy stored in the two textures is different. The deformation energy stored in the γ texture is higher than the α texture [24]. As a result, the γ texture preferentially nucleates and recrystallizes, and further grows due to the size advantage (during the growth stage).…”

Section: Discussionmentioning

confidence: 99%

Texture Evolution with Different Rolling Parameters of Ferritic Rolled IF Steel

Cai²,

Wang

et al. 2021

Metals

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Interstitial free (IF) steel is widely used in the automotive industry, due to its excellent deep drawing performance. In this study, in order to study the influence of different rolling processes on the texture evolution and deep drawing performance of IF steel, we conducted rolling experiments on IF steel with different temperatures, different reduction rates, and different lubrication conditions. The impact of texture on the deep drawing performance of the steel was also analyzed. The microscopic and macroscopic texture analyses were performed using electron backscatter diffraction (EBSD) and X-ray diffraction (XRD), respectively. Deep drawing performance was analyzed by measuring the r-value. The results showed that in non-lubricated rolling, the r-value increased with the decrease in the reduction rate, and the r-value increased with the increase in the deformation temperature. The maximum value of r is 0.85. But in the case of lubricated rolling, the r-value increased significantly from 0.74 to 1.47 compared to non-lubricated (keeping the reduction rate and the rolling temperature constant). The lubrication reduced the shear deformation of the steel surface, resulting in a γ texture on the surface. Texture uniformity along the thickness direction resulted in an increase in the r-value of the steel.

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Section: Discussionmentioning

confidence: 99%

Texture Evolution with Different Rolling Parameters of Ferritic Rolled IF Steel

Cai²,

Wang

et al. 2021

Metals

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“…Since higher dislocation density promotes recovery and recrystallization, subtle differences in deformation microstructure and heating conditions determine where recovery takes place [21]. It is obvious from the spatially resolved analysis (Section 3.6) that grains with higher dislocation density are consumed first, hence it can be assumed that the first effect dominates under the heating conditions investigated here.…”

Section: Annealing Conditionsmentioning

confidence: 95%

Site-specific quasi in situ investigation of primary static recrystallization in a low carbon steel

Diehl

Kertsch

Τράκα

et al. 2019

Materials Science and Engineering: A

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Low-alloyed steels with body-centered cubic crystal structure are a material class that is widely used for sheet metal forming applications. When having an adequate crystallographic texture and grain morphology, their mechanical behavior is characterized by an isotropic in-plane flow behavior in combination with a low yield strength. The decisive processing steps for obtaining these beneficial mechanical properties are cold rolling and subsequent annealing. While for the former the number of passes, the deformation rates, and the total thickness reduction are the main processing parameters, the latter is described mainly by the heating rate and the holding temperature and time. Primary static recrystallization during annealing subsequent to the cold rolling process alters mainly two aspects of the material state: It firstly replaces the elongated and heavily deformed grains of the cold rolled microstructure by small, globular grains with low dislocation density and secondly it changes the crystallographic texture insofar as it typically diminishes the α-and strengthens the γ-fiber texture components. In the present work, the recrystallization behavior of a commercial non-alloyed low carbon steel is studied. A quasi in situ setup that enables site-specific characterization is employed to gain a local picture of the nucleation and recrystallization process. From the Kernel Average Misorientation (KAM) values of the deformation structure, the tendency to be consumed by new grains can be predicted. Crystallographic analysis shows that the most deformed regions have either a γ-fiber orientation or belong to heavily fragmented shear band regions. New grains nucleate especially in such highly deformed regions and inherit often the orientation from the deformation microstructure.

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“…Grain growth, on other hand, is the increase in the size of grains at high temperatures, where strain-free grains consume the deformed matrix 2 . It has been previously highlighted in literature that the deformation textures in silicon steel; α-and γ-fiber, have different recovery rates and thus recrystallization rates 3,4 . It has been theorized that this is due to α-fiber having a lower lattice curvature, i.e., lower GND, resulting in less potential sites for nucleation 5 .…”

Section: Introductionmentioning

confidence: 99%