De L'anisotropie Du Fluage en Réacteur Des Tubes en Zr-2,5 Nb

ISBN-10
0660151898
ISBN-13
9780660151892
Category
Nuclear reactors
Pages
22
Language
English
Published
1993
Publisher
Chalk River, Ont. : Reactor Materials Research Branch, Chalk River Laboratories
Authors
A. R. Causey, Chalk River Nuclear Laboratories. Reactor Materials Research Branch

Description

The anistropy of creep deformation of Zr-2.5Nb pressure tubes during service in CANDU reactors is related to the anisotropic physical properties of the hexagonal crystal structure of zirconium. These physical properties contribute to the development during fabrication of an anisotropic microstructure, including crystallographic textures, grain morphologies, and dislocation structures. A number of studies tried to relate the anisotropic deformation of the polycrystalline zirconium alloys to those of their individual grains by accounting for the microstructural features, particularly the crystallographic texture, but they suffered from a lack of experimental data from biaxial creep tests on materials that have crystallographic texture similar to that of the pressure tubes. This experiment contributes to the development of a reliable model for Zr-2.5Nb tubes by using two batches of small tubes, one of which has a crystallographic texture similar to that of the CANDU power reactor pressure tubing, the other having a texture that is completely different. The results are analyzed in terms of texture using a self-consistent model to account for the effects of the grain interactions.

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