Tensile properties and microstructural evolution of Zircaloy-4 processed through rolling at different temperatures

Fuloria, Devasri; Kumar, Nikhil; Goel, Shivani; Jayaganthan, R.; Jha, S.K.; Srivastava, D.

doi:10.1016/j.matdes.2016.04.052

Cited by 38 publications

(5 citation statements)

References 27 publications

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“…(3), the strain rate of superplastic deformation has an inverse relationship with grain size to the power "p." Moreover, with the advent of severe plastic deformation methods, fabrication of ultrafine grain (UFG) and nano-sized grains can be obtained using cryo forming [8,9], multiaxial forging, equal-channel angular pressing (ECAP), friction stir processing (FSP), and high-pressure torsion (HPT). According to the Hall-Petch relationship, improvement in room-temperature mechanical properties in different alloys was studied extensively [10][11][12][13]. The advancement in superplastic deformation due to these UFG and nano-grain sizes is multifold.…”

Section: Introductionmentioning

confidence: 99%

Effect of Grain Size on Superplastic Deformation of Metallic Materials

Raja¹,

Jayaganthan²,

Tiwari³

et al. 2020

Aluminium Alloys and Composites

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The superplastic deformation exhibited by metals with different grain sizes and their corresponding deformation mechanism influences the industrial metalforming processes. The coarse-grained materials, which contain grain size greater than 20 μm, exhibited superplastic deformation at high homologous temperature and low strain rate of the order of 10 −4 s −1. Fine grain materials (1-20 μm) are generally considered as favorable for superplastic deformation. They possess highstrain-rate sensitivity "m" value, approximately, equal to 0.5 at the temperature of 0.5 times the melting point and at a strain rate of 10 −3 to 10 −4 s −1. Ultrafine grains (100 nm to less than 1 μm) exhibit superplasticity at high strain rate as well as at low temperature when compared to fine grain materials. It is attributed to the fact that both temperature and strain rates are inversely proportional to the grain size in Arrhenius-type superplastic constitute equation. The superplastic phenomenon with nano-sized grains (10 nm to less than 100 nm) is quite different from their higher-scale counterparts. It exhibits high ductility with high strength. Materials with mixed grain size distribution (bimodal or layered) are found to exhibit superior superplasticity when compared to the homogeneous grain-sized material. The deformation mechanisms governing these superplastic deformations with different scale grain size microstructures are discussed in this chapter.

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Section: Introductionmentioning

confidence: 99%

Effect of Grain Size on Superplastic Deformation of Metallic Materials

Raja¹,

Jayaganthan²,

Tiwari³

et al. 2020

Aluminium Alloys and Composites

View full text Add to dashboard Cite

show abstract

“…Indeed, Ko et al stated that the most important factor in increasing the hardness value of the thickness reduction is due to the evolution of a fine grain microstructure and the formation of low angle grain boundaries [15]. At the same time, it can be said that the high hardness in the near-surface regions occurs due to the increase in dislocation density and the reduction in grain size, making the dislocation movement of the grain boundaries more difficult [16].…”

Section: Resultsmentioning

confidence: 99%

Effect of Temper Rolling Reduction Ratio on Microhardness and Microstructure of DC04 Grade Sheet Material

Özakın

Kurgan

2022

Bitlis Eren Üniversitesi Fen Bilimleri Dergisi

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With temper rolling, which is the final stage of the cold rolling manufacturing process, to the surface of sheet metal materials is transferred roughness with specially roughened rolls. In this study, microhardness and microstructural evolution occurring in the section along the thickness of DC04 grade sheet materials temper rolled with various reduction ratios were investigated. As a result, it was concluded that the microhardness distribution taken from the section along the thickness increases with the increase of reduction ratio and the microhardness distribution from the surface to the center in the section decreases. In the temper rolling process with a reduction ratio of 250 µm and 500 µm an increase of approximately 5% and 15% has occurred, respectively compared to before the temper rolling process. It was also concluded that with the increase in reduction ratio, the grains in the section along the thickness elongated and thinned on the surface and this change in the center compared to the regions close to the surface was less.

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“…The EBSD data of the first sample are measured on a zirconium-hydrogen alloy zircaloy-4, which is typically used for constructive components in the nuclear power industry due to combination of excellent corrosion resistance, good neutron penetration and suitable mechanical properties. This sample only consists of the hexagonal phase, which has the symmetry group '6/mmm' [31,54]. The position of image I 1 and image I 2 differs by a rotation of 50 degrees, as can be seen in the top row of Figure 3.…”

Section: Reconstruction Of Rotated Ebsd Measurementsmentioning

confidence: 99%

An Image Registration Model in Electron Backscatter Diffraction

Gräf¹,

Neumayer²,

Hielscher³

et al. 2021

Preprint

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Recently, variational methods were successfully applied for computing the optical flow in gray and RGB-valued image sequences. A crucial assumption in these models is that pixel-values do not change under transformations. Nowadays, modern image acquisition techniques such as electron backscatter tomography (EBSD), which is used in material sciences, can capture images with values in nonlinear spaces. Here, the image values belong to the quotient space SO(3)/S of the special orthogonal group modulo the discrete symmetry group of the crystal. For such data, the assumption that pixel-values remain unchanged under transformations appears to be no longer valid. Hence, we propose a variational model for determining the optical flow in SO(3)/Svalued image sequences, taking the dependence of pixel-values on the transformation into account. More precisely, the data is transformed according to the rotation part in the polar decomposition of the Jacobian of the transformation. To model non-smooth transformations without obtaining so-called staircasing effects, we propose to use a total generalized variation like prior. Then, we prove existence of a minimizer for our model and explain how it can be discretized and minimized by a primal-dual algorithm. Numerical examples illustrate the performance of our method.

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Tensile properties and microstructural evolution of Zircaloy-4 processed through rolling at different temperatures

Cited by 38 publications

References 27 publications

Effect of Grain Size on Superplastic Deformation of Metallic Materials

Effect of Grain Size on Superplastic Deformation of Metallic Materials

Effect of Temper Rolling Reduction Ratio on Microhardness and Microstructure of DC04 Grade Sheet Material

An Image Registration Model in Electron Backscatter Diffraction

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