Destruction of Crystallographic Texture in Zirconium Alloy Tubes

Grytsyna, V; Stukalov, A; Chernyayeva, T; Krasnorutskyy, V; Malykhin, D; Voyevodin, V; Bryk, V

doi:10.1520/stp37513s

Cited by 3 publications

(15 citation statements)

References 18 publications

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“…As a result, as in the case of cross rolling of plates with specific preparation conditions (see Experimental) [4], during longitudinal rolling of such a material, oscillations in the TP changes are also observed (Fig. 1b).…”

Section: Et Almentioning

confidence: 53%

“…We also present and analyze the results of studies of plates straightened from rings of the same tube, with similar preparation conditions, including the degree of rolling with other details, and subsequent etching [4]. In view of the texture feature of the original tube, deformation for this series of samples was considered as cross rolling.…”

Section: Methodsmentioning

confidence: 99%

“…According to the experience of work [2,4], the deformation degrees were corrected taking in account its inhomogeneity along the thickness of the plates. The correction was calculated based on the values of the thickness and diameter of the original tube -and was introduced as a deformation of the medium on the surface of the original plates similarly to rolling.…”

Section: Et Almentioning

confidence: 99%

“…In the course of the research, a task was formed to study an effect of stress relaxation in Zr-2.5%Nb alloy, expressed in the instability of the process of texture changes after deformation, as well as to analyze conditions for manifestation of this effect. Preliminary studies have established that this effect is initiated on the surface of deformed plates [4]. Comparison of the results of works [2][3][4] gives reason to assume that this is due to surface impurities.…”

mentioning

confidence: 99%

“…Preliminary studies have established that this effect is initiated on the surface of deformed plates [4]. Comparison of the results of works [2][3][4] gives reason to assume that this is due to surface impurities. Such a circumstance can occur under usual conditions of materials machining.…”

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confidence: 99%

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Surface Purity Effect on Irregularities of Changes in Deformation Texture of Zr-2.5% Nb Alloy

Malykhin

Kovtun

Yurkova

et al. 2021

EEJP

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This work is a continuation of a series of works on the study of regularities and structural mechanisms of changes in characteristics of crystallographic texture during cold deformation of plates made of Zr2.5%Nb alloy. Effects of influence of surface cleanliness of the plates on the textural regularities during their rolling were investigated. For this, longitudinal fragments of the tube Æ15.0´1.5 mm² were used, flattened, annealed at 580°C in a vacuum of 1.5...3.0 Pa and rolled along the axis of the original tube with various degrees deformation up to 56%, which is likened to longitudinal rolling of plates. Techniques of maximally uniform straightening of tube fragments were used. An analysis of the results of studies of textural changes during cross rolling of plates, straightened from rings of the same tube and pretreated under similar conditions, is also carried out. To analyze the results, the method of inverse pole figures was used, which, in these studies, is distinguished by the possibility of achieving satisfactory accuracy in calculating the integral characteristics of texture. On this basis, the Kearns textural coefficient was calculated along the normal to the plates’ plane. Corrections were introduced for texture dissimilarity along the thickness of the plates, which is caused by the unbending of the preliminary blanks. Additionally, the analysis of texture distributions was carried out using original techniques. According to the results obtained – as a result of X-ray measuring from the plates’ surface – oscillations of the course of changes in the texture coefficient were revealed. This is associated with an alternating process of relaxation of residual stresses during deformation. It has been established that this effect is initiated from the near-surface regions, is associated with a near-surface impurity, and in some cases can penetrate to a considerable depth of the plates. The twinning nature of such regularities is confirmed and active systems of twins are noted.

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Section: Et Almentioning

confidence: 53%

Section: Methodsmentioning

confidence: 99%

Section: Et Almentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Surface Purity Effect on Irregularities of Changes in Deformation Texture of Zr-2.5% Nb Alloy

Malykhin

Kovtun

Yurkova

et al. 2021

EEJP

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Investigation of Irradiation Hardening and Embrittlement of Zr-2.5%Nb Alloy with High-Energy (e,γ)-Beams

Parkhomenko

Grytsyna

Chernyayeva

et al. 2008

Journal of ASTM International

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The paper researches into the effect of the initial structural condition of Zr-2.5%Nb alloy, which is widely used in reactor engineering to manufacture reactor core components (mainly as a structural material for RBMK and CANDU pressure tubes), and of irradiation conditions (temperature, applied stress) on irradiation hardening and embrittlement. The reactor damage of Zr-2.5%Nb alloy was modeled with a method of high-energy 225 MeV (e,γ)-beam irradiation, which allows samples to be irradiated under strictly controlled stress conditions. The research has been carried out on Zr-2.5%Nb alloy exposed to four types of thermo-mechanical treatment. It has been found that the alloy is susceptible to intensive irradiation embrittlement irrespective of its initial condition, and the intensity of Zr-2.5%Nb irradiation hardening greatly depends on pre-treatment. In contrast to other conditions, Zr-2.5%Nb alloy is virtually not susceptible to irradiation hardening after high-speed high-frequency (SHF) heating, quenching, and subsequent annealing in the high-temperature range of the α-region, during which the double-phase α+βNb state with high dispersion of βNb (∼1023 m−3) precipitates develops. The obtained results are in good agreement with the post-reactor irradiation tensile test results. The study demonstrates the efficiency of high-energy (e,γ)-beam irradiation for investigating the irradiation hardening and embrittlement of zirconium alloys.

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TEXTURAL AND STRUCTURAL REGULARITIES OF DEFORMATION BY ROLLING OF Zr-2.5%Nb ALLOY

Malykhin,

Grytsyna,

Kovtun

2023

Problems of Atomic Science and Technology

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A review of studies of regularities of changes in the crystallographic texture of the longitudinal and cross rolling of the Zr-2.5%Nb alloy is given. Accordingly with this, plates were made from longitudinal fragments and rings of a tube 15.01.5 mm from the fuel assemblies of Russian RBMK reactors. The plates were annealed at 580 °C for 3 h. X-ray studies of texture changes with the degree of deformation of the plates by rolling were carried out. The principle of method of inverse pole figures was used with the calculation of the Kearns texture coefficients, as well as measurements of tilt curves (0002) was. Non-uniformiity of deformation during straightening of the tube blanks was taken into account. It is found that the main rotations of crystallographic c-axes in the plates at any rolling direction are carried out in the plane corresponding to the cross-section of the original tube. Existence of an initial stage of increased textural changes during deformation of the plates is found, what is qualitatively and quantitatively related to activity of tensile twins of the {1012}[1011] system. Regularities in texture changes at the subsequent moderate stage of deformation with the participation of compression twins are considered. The purely twinning nature of the textural doublet, which latter is characteristic of the rolling texture of metals of the titanium subgroup, is explained. It is noted and explained a fact that during cross rolling of plates (made from tube rings), textural changes occur at a rate twice as high as during longitudinal rolling. As considered, all similar regularities can be carried out for the metals of the titanium subgroup.

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Destruction of Crystallographic Texture in Zirconium Alloy Tubes

Cited by 3 publications

References 18 publications

Surface Purity Effect on Irregularities of Changes in Deformation Texture of Zr-2.5% Nb Alloy

Surface Purity Effect on Irregularities of Changes in Deformation Texture of Zr-2.5% Nb Alloy

Investigation of Irradiation Hardening and Embrittlement of Zr-2.5%Nb Alloy with High-Energy (e,γ)-Beams

TEXTURAL AND STRUCTURAL REGULARITIES OF DEFORMATION BY ROLLING OF Zr-2.5%Nb ALLOY

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