Solid state phase transformation kinetics in Zr-base alloys

We present a kinetic model for solid state phase transformation ( α ⇌ β ) of common zirconium alloys used as fuel cladding material in light water reactors. The model computes the relative amounts of β or α phase fraction as a function of time or temperature in the alloys. The model accounts for the...

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Bibliographic Details
Published in:Scientific reports 2021-03, Vol.11 (1), p.7022-7022, Article 7022
Main Authors: Massih, A. R., Jernkvist, Lars O.
Format: Article
Language:English
Subjects:
639/301/1023
639/301/1034
Alloys
Computer programs
Cooling
Genetic transformation
Heating
Humanities and Social Sciences
Kinetics
multidisciplinary
Oxidation
Reactors
Science
Science (multidisciplinary)
Zirconium
Zirconium alloys
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Summary:We present a kinetic model for solid state phase transformation ( α ⇌ β ) of common zirconium alloys used as fuel cladding material in light water reactors. The model computes the relative amounts of β or α phase fraction as a function of time or temperature in the alloys. The model accounts for the influence of excess oxygen (due to oxidation) and hydrogen concentration (due to hydrogen pickup) on phase transformation kinetics. Two variants of the model denoted by A and B are presented. Model A is suitable for simulation of laboratory experiments in which the heating/cooling rate is constant and is prescribed. Model B is more generic. We compare the results of our model computations, for both A and B variants, with accessible experimental data reported in the literature covering heating/cooling rates of up to 100 K/s. The results of our comparison are satisfactory, especially for model A. Our model B is intended for implementation in fuel rod behavior computer programs, applicable to a reactor accident situation, in which the Zr-based fuel cladding may go through α ⇌ β phase transformation.
ISSN:2045-2322
2045-2322
DOI:10.1038/s41598-021-86308-w