Calculation of Deformation Behavior and Texture Evolution during Equal Channel Angular Pressing of IF Steel Using Dislocation Based Modeling of Strain Hardening

Baik, Seung‐Chul; Estrin, Yuri; Kim, Hyoung Seop; Jeong, Heon; Hellmig, Ralph Jörg

doi:10.4028/www.scientific.net/msf.408-412.697

Cited by 48 publications

(27 citation statements)

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“…The notations are the same as in Weertman and Sanders [104], Sanders [105], Sanders et al [106] and Ungár et al [30,103]. Submicron grain-size copper samples were prepared by ECAP either in the laboratory of Professor Valiev [107] or in the laboratory of Professor Estrin [108] denoted as ECAP(a) or ECAP(b), respectively. The twin densities, b are shown as a function of the areaweighted mean crystallite size, hxi area for the different nanocrystalline and submicron grain size specimens in Fig.…”

Section: Planar Faults In Nanocrystalline Metallic Materialsmentioning

confidence: 99%

Characterization of defect structures in nanocrystalline materials by X-ray line profile analysis

Gubicza

Ungár

2007

Zeitschrift Für Kristallographie - Crystalline Materials

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Abstract. X-ray line profile analysis is a powerful alternative tool for determining dislocation densities, dislocation type, crystallite and subgrain size and size-distributions, and planar defects, especially the frequency of twin boundaries and stacking faults. The method is especially useful in the case of submicron grain size or nanocrystalline materials, where X-ray line broadening is a well pronounced effect, and the observation of defects with very large density is often not easy by transmission electron microscopy. The fundamentals of X-ray line broadening are summarized in terms of the different qualitative breadth methods, and the more sophisticated and more quantitative whole pattern fitting procedures. The efficiency and practical use of X-ray line profile analysis is shown by discussing its applications to metallic, ceramic, diamond-like and polymer nanomaterials.

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Section: Planar Faults In Nanocrystalline Metallic Materialsmentioning

confidence: 99%

Characterization of defect structures in nanocrystalline materials by X-ray line profile analysis

Gubicza

Ungár

2007

Zeitschrift Für Kristallographie - Crystalline Materials

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“…The finite element method (FEM) has been successfully employed for simulation of ECAP process. [7][8][9][10][11][12] The finite element method (FEM) analyses with two ductile fracture models were employed to simulate plastic deformation and fracture behavior of the workpiece. A validity of the fracture models for ECAP of magnesium was assessed by comparing their numerical results with experimental ones.…”

Section: Introductionmentioning

confidence: 99%

Comparison in Deformation and Fracture Behavior of Magnesium during Equal Channel Angular Pressing by Experimental and Numerical Methods

et al. 2008

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Equal channel angular pressing (ECAP) is so far the most viable severe plastic deformation procedure to extrude material by using specially designed channel dies without any substantial changes in geometry and to prepare an ultrafine grained material. Magnesium is the lightest of all structural metallic materials, but a typical hard-to-deform metallic material due to its HCP structure and associated slip systems. ECAP has been applied for a processing method of severe plastic deformation to achieve grain refinement of magnesium and to enhance it's low ductility. In particular, we investigated the deformation and fracture behavior of pure magnesium workpiece using experimental and numerical methods. The finite element method with different ductile fracture models was employed to simulate plastic deformation and fracture behavior of the workpiece.

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“…In cold ECAP processing, the plastic deformation theory supposes that flow stress is independent of temperature [9][10][11][12], and is dependent on work hardening and strain rate sensitivity [13][14][15][16][17]. The assumption of strain and temperature independent, strain hardening and strain rate dependent material properties is acceptable for most cases of the cold plastic deformation of metallic materials, but at elevated temperatures the flow stress of metallic materials is affected considerably by both temperature and strain rate [18,19].…”

Section: Introductionmentioning

confidence: 99%

Upper bound analysis of deformation and dynamic ageing behavior in elevated temperature equal channel angular pressing of Al-Mg-Si alloys

2010

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In the present study, the plastic deformation and dynamic strain ageing behavior of Al-6082 (Al-Mg-Si) alloy treated with elevated temperature equal channel angular pressing (ECAP) were investigated using upper bound analyses. Tensile tests were carried out over wide ranges of temperature and strain rate in order to evaluate the dynamic ageing conditions. ECAP processing was then experimentally performed at temperatures from room temperature up to 200°C under various strain rates ranging between 10 −4 s −1 and 10 −1 s −1. The upper bound analysis solutions and the experimental results are comparable. A theoretical dynamic ageing region was found to be in the temperature range of 90°C to 260°C, which is in agreement with the experimental observations in the temperature range of 75°C to 175°C.

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Calculation of Deformation Behavior and Texture Evolution during Equal Channel Angular Pressing of IF Steel Using Dislocation Based Modeling of Strain Hardening

Cited by 48 publications

References 0 publications

Characterization of defect structures in nanocrystalline materials by X-ray line profile analysis

Characterization of defect structures in nanocrystalline materials by X-ray line profile analysis

Comparison in Deformation and Fracture Behavior of Magnesium during Equal Channel Angular Pressing by Experimental and Numerical Methods

Upper bound analysis of deformation and dynamic ageing behavior in elevated temperature equal channel angular pressing of Al-Mg-Si alloys

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