Hydride precipitation and its influence on mechanical properties of notched and unnotched Zircaloy-4 plates

Wang, Zhiyang; Garbe, Ulf; Li, Huijun; Harrison, Robert; Toppler, Karl; Studer, Andrew J.; Palmer, Tim; Planchenault, Guillaume

doi:10.1016/j.jnucmat.2013.01.330

Cited by 24 publications

(12 citation statements)

References 32 publications

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“…Rietveld refinement of the representative neutron diffraction patterns of the hydrided Zr-4 samples obtained at specific sample orientations was performed to quantify the hydrides formed, using GSAS with the generalized spherical-harmonics description for texture (Larsen & Von Dreele, 2004). The basis of this phase quantification analysis is the correlation between the weight fraction of a phase and the scale factor derived from the Rietveld analysis, which can be written as (Hill & Howard, 1987;Wang et al, 2013)…”

Section: Phase Analysismentioning

confidence: 99%

Microstructure and texture analysis of δ-hydride precipitation in Zircaloy-4 materials by electron microscopy and neutron diffraction

Wang

Garbe

et al. 2014

J Appl Crystallogr

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This work presents a detailed microstructure and texture study of various hydrided Zircaloy‐4 materials by neutron diffraction and microscopy. The results show that the precipitated δ‐ZrH1.66 generally follows the δ(111)//α(0001) and δ[]//α[] orientation relationship with the α‐Zr matrix. The δ‐hydride displays a weak texture that is determined by the texture of the α‐Zr matrix, and this dependence essentially originates from the observed orientation correlation between α‐Zr and δ‐hydride. Neutron diffraction line profile analysis and high‐resolution transmission electron microscopy observations reveal a significant number of dislocations present in the δ‐hydride, with an estimated average density one order of magnitude higher than that in the α‐Zr matrix, which contributes to the accommodation of the substantial misfit strains associated with hydride precipitation in the α‐Zr matrix. The present observations provide an insight into the behaviour of δ‐hydride precipitation in zirconium alloys and may help with understanding the induced embrittling effect of hydrides.

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Section: Phase Analysismentioning

confidence: 99%

Microstructure and texture analysis of δ-hydride precipitation in Zircaloy-4 materials by electron microscopy and neutron diffraction

Wang

Garbe

et al. 2014

J Appl Crystallogr

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“…In general, hydride nucleation mainly occurs at grain boundaries, but in some cases, many researchers have observed hydrides within the grains. Wang [18] found in his study that the sharp structures in the form of scratches or cracks were hydride platelets that can occur at the grain boundaries and within the grains as shown in Fig. 8.…”

Section: Microstructure Evolutionmentioning

confidence: 98%

“…Finally, due to the combination effects of defect and large concentration, the nucleation and growth of hydrides are facilitated in the zircaloy-4 specimens. Referring to the XRD analysis, where the presence of δ-hydride phase was indicated, the appearance of the structure mentioned by Wang [18] as hydride platelets can be explained due to the brittle nature of δ-hydride either when it is at room temperature or at high temperature. It has been proven during preparation of test material for the XRF purposes.…”

Section: Microstructure Evolutionmentioning

confidence: 99%

Characterization of Zircaloy-4 after Gaseous Hydriding at the Temperature Range of 350-600<sup>°</sup>C

2016

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The degradation of the mechanical properties of zircaloy-4 as nuclear fuel cladding is inevitable due to its interaction with hydrogen during normal reactor operation. This experiment observed the occurence of hydride phases after gaseous hydriding with hydrogen at elevated temperature, and their effects were evaluated based on the material's microstructure and mechanical properties. The zircaloy-4 cladding materials were annealed for two hours. It was followed by hydriding with the pressure from 100 up to 1200 mbar at various temperatures of 350°C, 500°C, 550°C and 600°C. The pressure-composition-isotherm (PCI) diagram showed that the hydrogen absorbed by specimen namely 0.18% wt, 0.38% wt, 0.44% wt and 0.74% wt at 350°C, 500°C, 550°C and 600°C, respectively. This result confirmed that the hydrogen content were 10, 128, 250, and 1357 ppm at 350°C, 500°C, 550°C, and 600°C, respectively, as measured by an ONH analyzer. X-ray diffraction showed that δ-hydride peaks were very weak based on fitting with the hydride database. The results from optical microscope and scanning electron microscope confirmed the presence of hydrides at the specimens, identified by the growth of needle-like structure at those temperatures.

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“…Interaksi ini akan menyebabkan terjadi peristiwa embrittlement yang akan menurunkan sifat mekanik Zr-4 dan telah menjadi perhatian utama para peneliti sejak peristiwa Fukushima 11 Maret 2011 [4]. Adanya endapan hidrogen di dalam Zr-4 pada burnup yang tinggi merusak kekuatan Zr-4, khususnya dalam hal tensile, ductility, ultimate strength, dan fracture toughness pipa Zr-4 [5,6].…”

Section: Pendahuluanunclassified

Hydride Formation Kinetics on Gaseous Hydriding of Zircaloy-4 Using Avrami Equation

Hadi

Sigit

2018

jsmi

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KINETIKA PEMBENTUKAN FASA HIDRIDA PADA ZIRCALOY-4 SELAMA PROSES GASEOUS HYDRIDING DENGAN PENDEKATAN PERSAMAAN AVRAMI. Sebagai salah satu paduan zirkonium, zircaloy-4 telah lama digunakan sebagai kelongsong bahan bakar nuklir. Interaksi zircaloy-4 dengan hidrogen baik selama operasi normal reaktor maupun kondisi transien akan mengakibatkan terjadinya degradasi sifat mekanik. Telah dilakukan analisis kinetika hydriding kelongsong Zircaloy-4 pada suhu 500 o C, 550 o C dan 600 o C dalam atmosfer hidrogen dengan metode AVRAMI untuk memperkirakan waktu pembentukan fasa hidrida yang rapuh dan observasi fisik kelongsong akibat interaksi kelongsong dengan hidrogen. Percobaan dilakukan dengan mereaksikan zircaloy-4 dengan hidrogen di sebuah alat hydriding. Analisis kinetika menunjukkan bahwa kecepatan reaksi hydriding mengikuti reaksi order dua dengan energi aktivasi 35 kJ/mol. Pembentukan fasa ε-ZrH, sebagai indikasi Zircaloy-4 mulai mengalami degradasi terbentuk dalam waktu 180 menit pada suhu 500 o C, 150 menit pada suhu 550 o C dan 100 menit pada suhu 600 o C. Penampakan visual zircaloy-4 pasca hydriding menunjukkan degradasi sifat mekanik seiring dengan kenaikan serapan hidrogen dan pembentukan fasa hidrida rapuh pada suhu yang lebih tinggi. Hal ini dikonfirmasi dengan kerusakan yang terlihat pada kelongsong pasca hydriding. Kelongsong mengalami penggelembungan pada suhu 550 o C dan menjadi hancur pada suhu 600 o C. Besarnya degradasi sifat mekanik akan ditentukan dengan uji mekanik lebih lanjut.

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Hydride precipitation and its influence on mechanical properties of notched and unnotched Zircaloy-4 plates

Cited by 24 publications

References 32 publications

Microstructure and texture analysis of δ-hydride precipitation in Zircaloy-4 materials by electron microscopy and neutron diffraction

Microstructure and texture analysis of δ-hydride precipitation in Zircaloy-4 materials by electron microscopy and neutron diffraction

Characterization of Zircaloy-4 after Gaseous Hydriding at the Temperature Range of 350-600<sup>°</sup>C

Hydride Formation Kinetics on Gaseous Hydriding of Zircaloy-4 Using Avrami Equation

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