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Experimental study and modelling of the phase transformation of Zircaloy-4 alloy under high thermal transients

Authors
  • Jailin, T.
  • TARDIF, Nicolas
  • Desquines, J.
  • Coret, M.
  • Baietto, M.-C.
  • Georgenthum, V.
Publication Date
Jan 01, 2020
Source
Kaleidoscope Open Archive
Keywords
Language
English
License
Unknown
External links

Abstract

Dilatometry tests were performed to study the phase transformation kinetic of nuclear fuel claddings made of Zircaloy-4 upon fast heating rates (up to 2000 °C/s). These tests highlighted that from equilibrium to 500 °C/s the temperature at which the transformation starts shifts towards higher temperatures with increasing heating rates. Above 500 °C/s, no impact of the heating rate was observed. The temperature at which the transformation ends remains close to 960 °C with no clear dependence on heating rate. Metallurgical analyses were carried out and were in agreement with the results obtained by dilatometry. A phase transition model was identified from equilibrium to 2000 °C/s.

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