Evaluation of intragranular misorientation parameters measured by EBSD in a hot worked austenitic stainless steel

Jorge-Badiola, D.; Iza-Mendia, A.; Gutiérrez, Isabel

doi:10.1111/j.1365-2818.2007.01850.x

Cited by 60 publications

(27 citation statements)

References 22 publications

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“…As a consequence of the alternating orientation in the microbands, the misorientation does not accumulate across the deformed grain. [24] B. Microstructural Evolution at 1273 K (1000°C)…”

Section: Resultsmentioning

confidence: 99%

“…This small point-to-point misorientation with a large cumulative misorientation signifies the formation of geometrically necessary boundaries (GNBs) inside the deformed grain. [24] The GNBs are formed to ensure the plastic strain compatibility between neighboring grains as well as to accommodate plastic strain gradients. [25,26] The misorientation profile over a distance CD across another deformed grain on the same sample (Figure 2(c)) is shown in Figure 2(d).…”

Section: Resultsmentioning

confidence: 99%

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A Study on Microstructural Evolution and Dynamic Recrystallization During Isothermal Deformation of a Ti-Modified Austenitic Stainless Steel

Mandal

Bhaduri

Sarma

2010

Metall Mater Trans A

216

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Dynamic recrystallization (DRX) behavior in hot deformed (by uniaxial compression in a thermomechanical simulator in the temperatures range 1173 K to 1373 K [900°C to 1100°C]) Ti-modified austenitic stainless steel was studied using electron back scatter diffraction. Grain orientation spread with a ''cut off'' of 1 deg was a suitable criterion to partition dynamically recrystallized grains from the deformed matrix. The extent of DRX increased with strain and temperature, and a completely DRX microstructure with a fine grain size~4 lm (considering twins as grain boundaries) was obtained in the sample deformed to a strain of 0.8 at 1373 K (1100°C). The nucleation of new DRX grains occurred by the bulging of the parent grain boundary. The DRX grains were twinned, and a linear relationship was observed between the area fraction of DRX grains and the number fraction of R3 boundaries. The deviation from the ideal misorientation of R3 boundaries decreased with an increase in the fraction of R3 boundaries (as well as the area fraction of DRX) signifying that most R3 boundaries are newly nucleated during DRX. The generation of these R3 boundaries could account for the formation of annealing twins during DRX. The role of R3 twin boundaries on DRX is discussed.

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“…As a consequence of the alternating orientation in the microbands, the misorientation does not accumulate across the deformed grain. [24] B. Microstructural Evolution at 1273 K (1000°C)…”

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

A Study on Microstructural Evolution and Dynamic Recrystallization During Isothermal Deformation of a Ti-Modified Austenitic Stainless Steel

Mandal

Bhaduri

Sarma

2010

Metall Mater Trans A

216

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“…[3,12] Comparing present ( Figure 4) and former results, it is remarkable that, in spite of the difference in materials, deformation modes, conditions, and techniques, a common trend is observed and the evolution of the dislocation density is not essentially different from the one exhibited by the Kernel average misorientation or by other EBSD ingrain misorientation parameters. [9,35] The reversal produces some net dissolution of the ingrain microstructure during roughly the first half of the transient and a net reconstruction during the second half. It has to be noted that at the Bauschinger strain, the microstructural parameters are slightly lower than the corresponding ones at the prestrain.…”

Section: Discussionmentioning

confidence: 99%

“…However, clear tendencies of the different EBSD parameters with strain path were recorded. [9,35] Here, only two of these parameters will be considered: the Kernel average misorientation, K aver , and the fraction in length of the R3 boundaries (twin boundaries), F R3 . A step size of 0.5 lm was applied.…”

Section: Methodsmentioning

confidence: 99%

Combined Model to Describe Both the Mechanical and Microstructural Transients under a Reversal of Strain

Jorge-Badiola

Lanzagorta

Gutiérrez

2011

Metall Mater Trans A

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A strain reversal produces microstructural and mechanical transients that cannot be described with conventional models applicable under monotonic deformation conditions. State-of-the-art models incorporating plastic strain path effects are polarized into continuum constitutive models of cyclic plasticity and multiscale constitutive approaches extrapolating crystallographic hardening models for monocrystals to polycrystals. The present work proposes a model midway between these two approaches that describes the mechanical transient through a combined kinematic-isotropic hardening model and the microstructural transient and its effect on the subsequent static recrystallization kinetics. The incorporation of an effective strain concept makes the link among the different submodels and allows for the first time an accurate reproduction with a reduced number of parameters both for mechanical and microstructural experimental data during the transient following a strain reversal.

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“…La severidad de dichos gradientes, y por ende la heterogeneidad en la deformación plástica dentro de los granos, pueden determinarse a partir de varios parámetros [1,[15][16][17][18], entre los cuales uno de los más usados es la desorientación promedio en núcleos, KAM (Kernel Average Misorientation) [5,19]. Este índice, que resulta dependiente del tamaño de paso con el que se efectúa la medición [20,21], puede usarse para estimar densidad de dislocaciones geométricamente necesarias, compatible con el campo de tensiones presentes en el material [22,23].…”

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Gradientes de orientación en cercanías del borde de grano estudiados por EBSD

et al. 2018

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RESUMENEl objetivo de este estudio es evaluar la desorientación local, su distribución y el gradiente de orientación en el desarrollo de la microestructura de una chapa de acero de calidad de embutido profundo (AKDQ). La microestructura se caracteriza con una resolución espacial a nivel de sub-grano usando difracción de electrones retrodifundidos (EBSD) en muestras sometidas a tensión uniaxial interrumpida en una probeta entallada y a solicitaciones típicas de procesos de conformado a través de ensayos Nakajima con diferentes geometrías de probeta. El empleo de la probeta entallada permite el estudio local de la evolución de la microestructura sobre un conjunto de granos identificables a medida que el material deforma, mientras las muestras correspondientes a los ensayos Nakajima se emplean para estudiar el comportamiento del gradiente de orientación con la distancia a los bordes de grano, bajo un enfoque estadístico. A partir de este último análisis se introducen dos nuevos parámetros basados en EBSD, llamados severidad promedio del gradiente (GAS) y espesor efectivo del borde (BET). En láminas de acero AKDQ de 0.67 mm de espesor, el valor del BET como indicador de la zona de influencia del BG resulta, en un sentido promedio, independiente del tamaño del grano y la condición de carga, sin superar los 3 μm. La severidad del gradiente muestra una buena correlación con la deformación plástica mesoscópica. Se observa además que la desorientación local se acumula en las proximidades de los bordes de grano mostrando diferencias en cada condición de carga.Palabras clave: Gradiente de orientación, EBSD, Deformación plástica, Chapa de acero AKDQ, condiciones de deformación en plano. ABSTRACTThe goal of this study is the evaluation of local misorientation, its distribution and orientation gradient in the microstructural development of a deep drawing quality steel sheet (AKDQ). The microstructure is characterized at sub-grain level spatial resolution using Electron Backscatter Diffraction (EBSD) in samples submitted to interrupted uniaxial tension in a notched sample and to typical solicitations in forming process through Nakajima tests with different sample geometries. The use of a notched sample allows performing a local study of the microstructural evolution in a set of identifiable grains as the material deforms, while the samples corresponding to Nakajima tests are used to study the behavior of the orientation gradient with the distance to the grain boundary under a statistical approach. From the latter analysis, two new EBSD-based parameters are introduced, named Gradient Average Severity (GAS) and Boundary Effective Thickness (BET). In 0.67 mm thick AKDQ steel sheets, the BET value as an indicator of GB influence zone is, in an average sense, independent on the grain size and the loading condition, below 3 μm. The gradient severity shows a good correlation with the mesoscopic plastic deformation. It is also observed that local misorientation accumulates in the grain boundary proximity, showing differences for each ...

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Evaluation of intragranular misorientation parameters measured by EBSD in a hot worked austenitic stainless steel

Cited by 60 publications

References 22 publications

A Study on Microstructural Evolution and Dynamic Recrystallization During Isothermal Deformation of a Ti-Modified Austenitic Stainless Steel

A Study on Microstructural Evolution and Dynamic Recrystallization During Isothermal Deformation of a Ti-Modified Austenitic Stainless Steel

Combined Model to Describe Both the Mechanical and Microstructural Transients under a Reversal of Strain

Gradientes de orientación en cercanías del borde de grano estudiados por EBSD

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