Contribution to Modeling of Hydrogen Effect on Oxygen Diffusion in Zy-4 Alloy During High Temperature Steam Oxidation

Mazères, Benoît; Desgranges, Clara; Toffolon-Masclet, Caroline; Monceau, Daniel

doi:10.1007/s11085-012-9335-1

Cited by 15 publications

(15 citation statements)

References 10 publications

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“…ppm of hydrogen. Then, the effect of hydrogen on the diffusion of oxygen during oxidation at high temperature [1,8,23] was expected to be similar for this work and for the study of Le Saux et al In this work, the thermal treatments consisted in oxidizing the samples at high temperature in order to reproduce the phenomenon of reduction of the low temperature oxide at four different temperatures, e.g. 1100, 1150, 1200 and 1250 • C. The experimental device used to perform the oxidation is composed by two different areas.…”

Section: Methodsmentioning

confidence: 99%

“…The displacement of the ␣ Zr (O)/␤ Zr interface is calculated with the same procedure (Eqs. (7) and (8)).…”

Section: General Descriptionmentioning

confidence: 98%

“…The numerical tool EKINOX-Zr [6][7][8] was designed to simulate the oxidation at high temperature of zirconium alloys. The kinetics of growth of both the oxide scale and the layer of ␣ Zr (O) phase were calculated.…”

Section: General Descriptionmentioning

confidence: 99%

“…3 ThermoCalc calculates the equilibrium concentrations which are implemented backward as boundaries conditions at oxide/metal (i.e. oxide/␣ Zr (O)) and ␣ Zr (O)/␤ Zr interfaces [8].…”

Section: General Descriptionmentioning

confidence: 99%

“…EKINOX-Zr model is able to simulate both oxide and ␣ Zr (O) phase growth kinetics [6][7][8]. It is also possible to calculate the weight gain due to high temperature oxidation.…”

Section: Numerical Simulationsmentioning

confidence: 99%

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Experimental study and numerical simulation of high temperature (1100–1250 °C) oxidation of prior-oxidized zirconium alloy

et al. 2016

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Previous experiments showed that the thickness of a thick prior-oxide layer formed on Zircaloy-4 fuel cladding can decrease during the first seconds at very high-temperature, before re-growing. We confirmed these results with oxidations performed at 1200 • C on prior-oxidized Zircaloy-4. The initial reduction of the prior-oxide was explained by the balance of the oxygen fluxes at the metal/oxide interface and successfully reproduced by numerical simulations using a diffusion-reaction model. Different hypotheses were considered for the diffusion coefficients of oxygen in the different layers. This allowed discussing the effect of the prior-oxidation on the kinetics of oxygen embrittlement of the metallic substrate. Abbreviations: ␣ red , ␣Zr(O) phase formed by reduction of the low temperature oxide layer; Exp, experimental, i.e. data link with experimental results; EKINOX-Zr, Estimation KINetics OXidation numerical model for Zr alloys; HCP, hexagonal close-packed; HT, high temperature; HTox/HT ZrO2, oxide layer formed at high temperature (T ≥ 1000 • C); LOCA, loss-of-coolant-accident; LT, Low temperature, i.e. the in-service temperature of the PWR (T≈320 • C); LTox/LT ZrO2, oxide layer formed at low temperature; Num., numerical, i.e. data link to numerical results; PBR, Pilling-Bedworth ratio; Prior-␤Zr, phase formed from the cooling of ␤Zr phase stable at high temperature; PWR, pressurized-light-water-reactor.

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Section: Methodsmentioning

confidence: 99%

“…The displacement of the ␣ Zr (O)/␤ Zr interface is calculated with the same procedure (Eqs. (7) and (8)).…”

Section: General Descriptionmentioning

confidence: 98%

Section: General Descriptionmentioning

confidence: 99%

“…3 ThermoCalc calculates the equilibrium concentrations which are implemented backward as boundaries conditions at oxide/metal (i.e. oxide/␣ Zr (O)) and ␣ Zr (O)/␤ Zr interfaces [8].…”

Section: General Descriptionmentioning

confidence: 99%

“…EKINOX-Zr model is able to simulate both oxide and ␣ Zr (O) phase growth kinetics [6][7][8]. It is also possible to calculate the weight gain due to high temperature oxidation.…”

Section: Numerical Simulationsmentioning

confidence: 99%

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Experimental study and numerical simulation of high temperature (1100–1250 °C) oxidation of prior-oxidized zirconium alloy

et al. 2016

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Modeling Two- and Three-Stage Oxygen Tracer Experiments during High-Temperature Oxidation of Metals with a High Oxygen Solubility

et al. 2017

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The numerical tool EKINOX-Zr has been upgraded to simulate oxygen tracer experiments during the high-temperature oxidation of a metal with a high oxygen solubility limit. The penetration of 18 O tracer is calculated during the dynamic evolution of the ZrO 2-x /a Zr(O) /b zr system. The numerical approach allows to explicitly take into account the variation of the tracer diffusion coefficient through the oxide scale as a function of the vacancy concentration. A classical twostages 16 O 2 / 18 O 2 tracer experiment has been simulated. It is shown that a classical fitting procedure on the 18 O concentration profile obtained for short-time experiments leads to the identification of the oxygen chemical diffusion coefficient. The second type of tracer experiment is proposed using a three-stages 16 O 2 / 18 O 2 / 16 O 2

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High temperature steam oxidation of chromium-coated zirconium-based alloys: Kinetics and process

et al. 2020

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Contribution to Modeling of Hydrogen Effect on Oxygen Diffusion in Zy-4 Alloy During High Temperature Steam Oxidation

Abstract: OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible.

Cited by 15 publications

References 10 publications

Experimental study and numerical simulation of high temperature (1100–1250 °C) oxidation of prior-oxidized zirconium alloy

Experimental study and numerical simulation of high temperature (1100–1250 °C) oxidation of prior-oxidized zirconium alloy

Modeling Two- and Three-Stage Oxygen Tracer Experiments during High-Temperature Oxidation of Metals with a High Oxygen Solubility

High temperature steam oxidation of chromium-coated zirconium-based alloys: Kinetics and process

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