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Theoretical Study of Swelling of Structural Materials in Light Water Reactors at High Fluencies

  • S. I. Golubov
  • A. V. Barashev
Conference paper
Part of the The Minerals, Metals & Materials Series book series (MMMS)

Abstract

A mean-field, cluster dynamics model of the microstructure evolution in austenitic steels of light water reactors which reproduces the incubation period of swelling has been developed for the first time. In agreement with observations, it predicts that, although the void nucleation starts from the very beginning of irradiation, their growth beyond certain, relatively small size is delayed until the onset of the transient period of swelling. Such a delayed growth of voids is explained by the frequent interaction of voids randomly distributed over the volume with one-dimensionally migrating clusters of self-interstitial atoms, which are produced in cascades of atomic displacements. The incubation period of swelling is followed by the transient stage, when voids start to grow with increasing rate due to development of the experimentally-observed spatial correlations between voids and extended defects, such as second-phase precipitates and dislocations, which screen voids from the mobile clusters. A critical role of residual gas on void nucleation, which diminishes importance of He atoms from transmutation reactions, is revealed.

Keywords

Swelling Reactor materials Theory 

Notes

Acknowledgements

Research was supported by the Light Water Reactor Sustainability Program, Office of Nuclear Energy, Science and Technology, U.S. Department of Energy.

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Copyright information

© The Minerals, Metals & Materials Society 2019

Authors and Affiliations

  1. 1.Materials Science and Technology Division, Oak Ridge National LaboratoryOak RidgeUSA
  2. 2.Department of Materials Science and Engineering, Center for Materials ProcessingUniversity of TennesseeKnoxvilleUSA

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