Hydride behavior in Zircaloy cladding tube during high-temperature transients

Abstract:The mechanical properties of the hydrogenated zirconium alloy Zr-1Nb are studied under different conditions for hydrogen removal by an electron beam and thermal heating. The mechanical testing of zirconium samples is analyzed during hydrogenation and irradiation with a low energy electron beam. The plasticity of the samples is shown to be increased during the radiation stimulation of hydrogen removal from zirconium by even a weak electron beam. In this case, the tensile strength (ultimate strength) is practically not changed.

Section: Investigation Of Gas Release From Zirconium Alloy Samplesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mechanical Property Testing of Hydrogenated Zirconium Irradiated with Electrons

Kudiiarov

Ларионов

Tyurin

2018

“…With the exceedance of the hydrogen solubility limit in zirconium alloys, the formation of hydride phases takes place; the latter causes the greatest embrittlement, as hydrides possess significantly lower plasticity in comparison with zirconium. Furthermore, hydrides in the zirconium matrix can serve as the locations for crack initiation, followed by a subsequent crack opening [11][12][13] and the formation of through-the-thickness damage.…”

Section: Introductionmentioning

confidence: 99%

Hydride Rim Formation in E110 Zirconium Alloy during Gas-Phase Hydrogenation

Kudiiarov

Sakvin

Сыртанов

et al. 2020

The work is devoted to the study of the laws of the formation of a hydride rim in E110 zirconium alloy claddings during gas-phase hydrogenation. The problem of hydrogen penetration and accumulation and the subsequent formation of hydrides in the volume of zirconium cladding tubes of water-cooled power reactors remain relevant. The formation of brittle hydrides in a zirconium matrix firstly, leads to a significant change in the mechanical properties, and secondly, can cause the destruction of the claddings by the mechanism of delayed hydride cracking. The degree of the hydride’s effect on the mechanical properties of zirconium cladding is mainly determined by the features of the hydride’s distribution and orientation. The problem of hydride rim formation in zirconium alloys with niobium is quite new and poorly studied. Therefore, the study of hydride rim formation in Russian zirconium alloy is important and necessary for predicting the behavior of claddings during the formation of the hydride rim.

“…This may cause changes in the structure due to the penetration of gases into the material. Many macroscopic properties of metals and their alloys depend on hydrogen, which is a common impurity found in structural materials after their usage [3][4][5][6][7][8]. Hydrogen can cause phase transformations leading to hydride formation [9][10][11][12][13][14][15][16], interactions with structural defects modifying the plastic activity of materials [17], the interplay with point defects provoking swelling [18][19][20][21], or so-called hydrogen embrittlement.…”

Section: Introductionmentioning

confidence: 99%

Glow Discharge Optical Emission Spectrometer Calibration Using Hydrogenated Zr-2.5Nb Alloy Standard Samples

Priamushko¹,

Mikhaylov²,

Babikhina³

et al. 2018

Abstract:Currently, standard samples of hydrogen-metal systems meeting the requirements of glow discharge optical emission spectrometers (GD-OES) are not available on the market. This article describes the preparation of Zr-Nb-H standard samples and the calibration of GD-OES with the usage of these samples. Samples of Zr-2.5Nb were chosen as the material for sample production. The creation procedure includes five main steps: sample preparation (polishing to an average roughness, Ra, of 0.04 m using sandpaper), annealing, hydrogenation, maintenance in an inert gas atmosphere, and characterization of the samples. The absolute hydrogen concentration in the samples was determined volumetrically and calculated from the weight change. The distribution of hydrogen was studied using GD-OES Profiler 2 by Jobin Yvon Emission Horiba Group. As a result of this work, calibration curves of Zr, H, Nb, O, and other elements were obtained. The calibration errors were in the range of 1-5%.