Microstructural Evaluation of High Temperature Creep Behavior in Hydrided E11 0 Cladding

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F26722445%3A_____%2F16%3AN0000202" target="_blank" >RIV/26722445:_____/16:N0000202 - isvavai.cz</a>

Výsledek na webu

<a href="https://www.djs.si/proc/nene2016/html/pdf/NENE2016_601.pdf" target="_blank" >https://www.djs.si/proc/nene2016/html/pdf/NENE2016_601.pdf</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Microstructural Evaluation of High Temperature Creep Behavior in Hydrided E11 0 Cladding

Popis výsledku v původním jazyce

In this work, EllO cladding creep behaviour at dry storage conditions is studied. Test specimen was oxidized in an autoclave to have 334 ppm of hydrogen by weight. Creep test was performed in a horizontal furnace with internal pressure of 55 MPa at 530°C test temperature for a period of 30 hours. Optical and transmission electron microscopy investigations were made on creep tested specimen to reveal hydride re-orientation, interaction of dislocations, secondary precipitate particles and location of hydrides with grain boundaries owing to different deformed zones. Optical micrographs revealed hydrides oriented in the circumferential direction and absence of re-oriented hydrides (radial hydrides). TEM images showed polyhedral grains of a - Zr phase with hexagonal lattice and lattice parameters a = b = 3.136 A, c = 5.039 A, a = ~ = 90 0 , Y = 120 ° with grain size ranges from ~ 3-5 microns. Grains are recrystallized with boundaries straight or slightly curved, and often there are sub-grains and twinning. Numerous dislocations and precipitates of secondary phases in a - phase were observed. From these observations it is concluded that at the applied stress and hydrogen level, though the cladding is deformed and ballooned, no radial hydrides are formed that could further reduce the mechanical integrity of the cladding. Increase of dislocations in grains linked together with grain boundary sliding could cause the ballooning/deformation of cladding with reduction in thickness at the applied stress level, temperature and hydrogen content.

Název v anglickém jazyce

Microstructural Evaluation of High Temperature Creep Behavior in Hydrided E11 0 Cladding

Popis výsledku anglicky

In this work, EllO cladding creep behaviour at dry storage conditions is studied. Test specimen was oxidized in an autoclave to have 334 ppm of hydrogen by weight. Creep test was performed in a horizontal furnace with internal pressure of 55 MPa at 530°C test temperature for a period of 30 hours. Optical and transmission electron microscopy investigations were made on creep tested specimen to reveal hydride re-orientation, interaction of dislocations, secondary precipitate particles and location of hydrides with grain boundaries owing to different deformed zones. Optical micrographs revealed hydrides oriented in the circumferential direction and absence of re-oriented hydrides (radial hydrides). TEM images showed polyhedral grains of a - Zr phase with hexagonal lattice and lattice parameters a = b = 3.136 A, c = 5.039 A, a = ~ = 90 0 , Y = 120 ° with grain size ranges from ~ 3-5 microns. Grains are recrystallized with boundaries straight or slightly curved, and often there are sub-grains and twinning. Numerous dislocations and precipitates of secondary phases in a - phase were observed. From these observations it is concluded that at the applied stress and hydrogen level, though the cladding is deformed and ballooned, no radial hydrides are formed that could further reduce the mechanical integrity of the cladding. Increase of dislocations in grains linked together with grain boundary sliding could cause the ballooning/deformation of cladding with reduction in thickness at the applied stress level, temperature and hydrogen content.

Druh

D - Stať ve sborníku

CEP obor

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OECD FORD obor

20501 - Materials engineering

Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2016

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

NENE 2016 : 25th International Conference Nuclear Energy for New Europe

ISBN

978-961-6207-39-3

ISSN

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e-ISSN

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Počet stran výsledku

14

Strana od-do

1-14

Název nakladatele

Nuclear Society of Slovenia

Místo vydání

Ljubljana, Slovenia

Místo konání akce

Portorož, Slovenia

Datum konání akce

5. 9. 2016

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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