Hydride embrittlement in ZIRCALOY-4 plate: Part I. Influence of microstructure on the hydride embrittlement in ZIRCALOY-4 at 20 °C and 350 °C

Bai, Jinbo; Prioul, C.; François, Dominique

doi:10.1007/bf02652293

Cited by 138 publications

(82 citation statements)

References 32 publications

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“…It is reported for Zircaloy-4 [28,29] that, in the ashydrided condition even with 500 wt ppm of hydrogen, no significant loss of the ductility is observed. However, Fig.…”

Section: Tensile Propertiesmentioning

confidence: 89%

Stress-reorientation of hydrides and hydride embrittlement of Zr–2.5 wt% Nb pressure tube alloy

Singh

Kishore

Singh

et al. 2004

Journal of Nuclear Materials

115

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“…It is reported for Zircaloy-4 [28,29] that, in the ashydrided condition even with 500 wt ppm of hydrogen, no significant loss of the ductility is observed. However, Fig.…”

Section: Tensile Propertiesmentioning

confidence: 89%

Stress-reorientation of hydrides and hydride embrittlement of Zr–2.5 wt% Nb pressure tube alloy

Singh

Kishore

Singh

et al. 2004

Journal of Nuclear Materials

115

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“…The observed substantial GAM or strain in d-ZrH 1.66 is attributed to the accommodation of large dilatational misfit strain associated with the a-Zr (hcp) fi d-ZrH 1.66 (fcc) transformation through the elastic lattice distortion or the generation of misfit dislocations. [6] During the hydride transition, it is speculated that the local misorientation is comprehensively developed in all hydride grains. In contrast, the local misorientation is generated only partially in some limited a-Zr grains adjacent to hydrides.…”

Section: A Phase Identification and Quantificationmentioning

confidence: 99%

“…[4,5] So far, research on the precipitation and distribution of hydrides in Zr-4 acting as a fracture initiator has received considerable attention. [5,6] Observation of hydride formation in Zr-4 alloys has been conducted via various techniques such as X-ray diffraction, optical or electron microscopy, and electron backscattered diffraction (EBSD). [1,2,4] Sufficient information in terms of the phase, morphology, and size of hydrides, and the orientation relationship between the hydride and matrix phases can be derived from these investigations.…”

Section: Introductionmentioning

confidence: 99%

Observations on the Zirconium Hydride Precipitation and Distribution in Zircaloy-4

Wang

Garbe

et al. 2013

Metall Mater Trans B

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Hydride precipitation and distribution in hot-rolled and annealed Zircaloy-4 plate samples artificially induced by gaseous hydrogen charging were studied primarily by neutron tomography, scanning electron microscopy (SEM), and SEM-based electron backscattered diffraction techniques. The precipitated hydride platelet (δ-ZrH1.66) at a hydrogen pressure of 20 atm was found following the {111}δ-ZrH1.66//(0001) α-Zr with the surrounding α-Zr matrix. The microstructural characterization indicated that hydrides with a relatively uniform distribution were precipitated on the rolling-transverse section of the plate, whereas, on the normaltransverse section, a hydride concentration gradient was present with a dense hydride layer near the surface. Further, the neutron tomography investigations clearly identified the nonuniform spatial distribution of hydrides. Thin hydride layers preferentially formed on the sample surface, and the concentrated hydrides precipitating at the edges/corner of the sample were observed. The causes for the localized hydride accumulation were also discussed. Disciplines Engineering | Science and Technology Studies Publication DetailsWang, Z., Garbe, U., Li, H., Harrison, R. P., Kaestner, A. & Lehmann, E. (2014 Hydride precipitation and distribution in hot-rolled and annealed Zircaloy-4 plate samples artificially induced by gaseous hydrogen charging were studied primarily by neutron tomography, scanning electron microscopy (SEM), and SEM-based electron backscattered diffraction techniques. The precipitated hydride platelet (d-ZrH 1.66 ) at a hydrogen pressure of 20 atm was found following the {111} d-ZrH1.66 //(0001) a-Zr with the surrounding a-Zr matrix. The microstructural characterization indicated that hydrides with a relatively uniform distribution were precipitated on the rolling-transverse section of the plate, whereas, on the normal-transverse section, a hydride concentration gradient was present with a dense hydride layer near the surface. Further, the neutron tomography investigations clearly identified the nonuniform spatial distribution of hydrides. Thin hydride layers preferentially formed on the sample surface, and the concentrated hydrides precipitating at the edges/ corner of the sample were observed. The causes for the localized hydride accumulation were also discussed.

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“…L'application d'une contrainte de traction ou de cisaillement favorise la précipitation d'hydrures au détriment des hydrures formés sans contrainte [75,76]. De plus, les hydrures précipitent dans un plan perpendiculaire à la plus grande contrainte principale en tension [77][78][79]. La teneur en éléments d'alliage influence la nature des hydrures précipités ( ou ) [80]; en particulier des concentrations en oxygène supérieures à 1000 ppm favorisent la précipitation de l'hydrure dans les alliages de zirconium.…”

Section: Structure Précipitation Et Croissanceunclassified

“…5) [107-109, 117, 128, 129]. Certains auteurs notent que les hydrures sont capables de s'aligner parallèlement à la contrainte appliquée avant de se rompre, démontrant ainsi une certaine capacité des hydrures à se déformer [59,77,78,121]. Les observations réalisées à l'échelle du MET ( fig.…”

Section: Plasticité Des Hydruresunclassified

Influence de l'hydrogène sur les mécanismes de déformation et d'endommagement des alliages de titane et de zirconium

Feaugas

Conforto

2009

PlastOx 2007 - Mécanismes Et Mécanique Des Interactions Plasticité - Environnement

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Résumé. L'hydrogène, élément rarement dissociable des alliages de titane et de zirconium, confèrent à ceux-ci des propriétés physico-chimiques particulières dont les conséquences sur les processus de déformation et d'endommagement sont incontestables. A travers cet écrit nous faisons une synthèse des résultats acquis dans ce domaine en nous attachant à préciser les relations connues entre les différents états microstructuraux des alliages et les propriétés mécaniques. Le point le plus marquant, dans ce contexte, est le rôle du couple oxygène-hydrogène sur les mécanismes de déformation et d'endommagement.

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Hydride embrittlement in ZIRCALOY-4 plate: Part I. Influence of microstructure on the hydride embrittlement in ZIRCALOY-4 at 20 °C and 350 °C

Cited by 138 publications

References 32 publications

Stress-reorientation of hydrides and hydride embrittlement of Zr–2.5 wt% Nb pressure tube alloy

Stress-reorientation of hydrides and hydride embrittlement of Zr–2.5 wt% Nb pressure tube alloy

Observations on the Zirconium Hydride Precipitation and Distribution in Zircaloy-4

Influence de l'hydrogène sur les mécanismes de déformation et d'endommagement des alliages de titane et de zirconium

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