Destruction of Crystallographic Texture in Zirconium Alloy Tubes

Grytsyna, V.; Stukalov, A. I.; Chernyayeva, T. P.; Krasnorutskyy, V.S.; Malykhin, D. G.; Voyevodin, V.N.; Брык, В.В.

doi:10.1520/jai12339

Cited by 8 publications

(3 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The set of I 0i values for a given alloy was obtained by synthesis of the calculated and experimental data. The latter were obtained on the basis of a series of studies on texture destruction of the given alloy by microwave heat treatment [13].…”

Section: On the Ipfs Methodsmentioning

confidence: 99%

Regularities of Changes in Kearns Texture Coefficient at Cold Rolling of Zr-2.5%Nb Alloy

Grytsyna

Malykhin

Yurkova

et al. 2019

EEJP

View full text Add to dashboard Cite

-ray studies of the changes in characteristics of crystallographic texture with cold deformation of Zr‑2.5%Nb alloy plates by longitudinal and cross rolling up to 56% at the speed of 5…10 sec-1 were carried out. The original plates were made from longitudinal fragments and rings cut from Æ15.0´1.5 mm² tube, and were then annealed at 580 °C. Texture of the plates was studied by the method of inverse pole figures with calculation of the Kearns texture coefficient along the normal to the plate plane. Dependences of the texture coefficient on degrees of deformation of the plates are built. A discrepancy was found between texture coefficient values measured on different sides of the plates, which is associated with the straightening of the original tube fragments and invariance of “c”-axes distribution after subsequent annealing of the initial plates. By introducing corrections to the degree of deformation calculated from the parameters of the cross section of the original tube, such discrepancies were eliminated for the data on cross-rolling of the material. As a result, for both deformation schemes, two stages of changes in the texture coefficient with alloy deformation were revealed: the initial stage of its growth and the subsequent stage of minor changes. Both stages are mainly linear and have the boundary value of the texture coefficient equal to 0.65...0.68. To study the structural mechanisms of changes in the texture of the alloy, an original technique of comparative analysis of changes in the texture coefficient of the material and in the distribution of crystallographic orientations is applied. It is established that at the initial stage of changes in the texture coefficient with deformation in both schemes, the rotation of the crystallographic “c” axes of the material occurs abruptly, and it does at angles of more than 60°. This confirms the essential role of twinning in the texture changes of the alloy. In particular, we have shown that the initial stage is significantly dominated by the {102}á011ñ system of tensile twins. Connection of twinning with differences in texture changes at the longitudinal and cross rolling of the alloy is discussed.

show abstract

Section: On the Ipfs Methodsmentioning

confidence: 99%

Regularities of Changes in Kearns Texture Coefficient at Cold Rolling of Zr-2.5%Nb Alloy

Grytsyna

Malykhin

Yurkova

et al. 2019

EEJP

View full text Add to dashboard Cite

show abstract

“…The method was tested at its application to the Zr-2.5% Nb alloy texture investigations. So, the refined intensities I 0i were obtained by averaging the results for the samples of this alloy, obtained in three projections [6]. After comparing the results with the calculated values, the final set of values was obtained, the error of each of them is estimated at a limit of 5%.…”

Section: Technique and Materialsmentioning

confidence: 99%

Influence of Cold Rolling to the Texture Parameter of Pure Hafnium and Zirconium

Ковтун¹,

Kovtun²,

Malykhin³

et al. 2017

EEJP

View full text Add to dashboard Cite

Results of X-ray investigations of dependence of the crystallographic texture of hafnium and zirconium on degrees of cold rolling are presented. To obtain numerical principles, the method of inverse pole figures (IPF) with calculation of the texture parameters of Kearns (TP) for a chosen direction has been used. Measuring was carried out in the plane of the plates, as well as in the other two directions relating to rolling. The trigonal diagram of TP changes with degrees of deformation was built. Two stages of TP changes with deformation degrees are revealed: rate of the TP changes at the initial stage and, in part, characteristics of the subsequent stage depend on the initial texture of the materials. The second stage is characterized either by achievement of a minimum of TP in the rolling direction of the plates, or by moderate and even slight changes of them. In an example of hafnium, it has established that the increased rate of initial changes in TP is exclusively associated with intensive twinning predominantly by the {1012} 1011 system.Arguments for dominance of twinning in the texture formation in hafnium and zirconium on the subsequent stage of rolling deformation are given. KEYWORDS: X-ray analysis, texture, inverse pole figures, texture parameter, cold rolling, hafnium, zirconium, twinning , . , 1Zirconium and hafnium are the basis of materials intended for use in the construction of nuclear reactors. Products made of such materials, especially from zirconium-niobium alloys, undergo a special thermo-mechanical treatment aimed to maximize their satisfactory performance. Their crystallographic texture is an important characteristic on which the mechanical and radiation properties of these materials depend, as well as concerning to other hcp metals. Obtaining skills to predict its development after a necessary cycle of treatments is of practical interest. Study of principles of its changes after elementary processing cycles and analysis of the structural mechanisms responsible for these changes is

show abstract

“…At elevated temperatures, α-Zr can be transformed into β-Zr with a body centred cubic (bcc) structure through allotropic phase transformation. During fabrications of Zr alloy products (like tubes and sheets), heat treatments at near the β-transus temperatures are often employed, which could not only markedly change their microstructural characteristics [8][9][10][11], but also effectively alter the textures developed earlier [12,13].…”

Section: Introductionmentioning

confidence: 99%

Intensified texture of Zr702 sheet after slow cooling from near β-transus temperature

Zeng

Zhu

et al. 2019

Materials Science and Technology

View full text Add to dashboard Cite

Microstructures and textures of a Zr702 sheet subjected to slow cooling (air cooling (AC) and furnace cooling (FC)) from a near β-transus temperature (980°C) were characterised by electron channelling contrast imaging and electron backscatter diffraction techniques. Results show that textural intensities of both the AC and the FC are markedly higher than that of the initial specimen and the FC specimen owns the strongest texture. After both the heat treatments, the initial bimodal basal textural features are retained with the recrystallisation textural component (0°, 30°, 30°) becoming dominant but the deformation textural component (0°, 30°, 0/60°) largely weakened. The textural intensification is attributed to strong variant selection during the β → α phase transformation and slow cooling-induced sufficient growth of residual prior α grains.

show abstract

Destruction of Crystallographic Texture in Zirconium Alloy Tubes

Cited by 8 publications

References 17 publications

Regularities of Changes in Kearns Texture Coefficient at Cold Rolling of Zr-2.5%Nb Alloy

Regularities of Changes in Kearns Texture Coefficient at Cold Rolling of Zr-2.5%Nb Alloy

Influence of Cold Rolling to the Texture Parameter of Pure Hafnium and Zirconium

Intensified texture of Zr702 sheet after slow cooling from near β-transus temperature

Contact Info

Product

Resources

About