Delayed hydride cracking of Zr-2.5%Nb pressure tube material due to partially constrained precipitates

JOURNAL OF NUCLEAR MATERIALS

卷:513

Article

Murty, T. Narayana^1,2  Singh, R. N.^1,2  Stahle, P.³ 

[1] Bhabha Atom Res Ctr, Mech Met Div, Bombay 400085, Maharashtra, India

[2] Homi Bhabha Natl Inst, Bombay 400094, Maharashtra, India

[3] Lund Univ, Div Solid Mech, S-22100 Lund, Sweden

关键词: Zr-25%Nb alloy;    Hydride blister;    Oxide nodule;    Finite element method;    Stress field;    Delayed hydride cracking;   

DOI  :  10.1016/j.jnucmat.2018.10.040

来源: Elsevier

【 摘 要 】

Formation of partially constrained precipitates such as hydride blisters and oxide nodules have been reported on surfaces of Zr-alloy components of pressurised heavy water reactors and is associated with a large increase in volume. Such a change in volume imposes large stresses in the material surrounding the precipitate and may facilitate stable crack growth through delayed hydride cracking. In this work, the stress field of the partially constrained precipitates with different depth and aspect ratio has been computed using a finite element method. The computed stress field is used to predict the region in the matrix in which radial hydride is likely to form and fracture, by taking into consideration grain-size, texture and multi-axial state of stress. For a hypothetical crack just below the precipitate, stress intensity factors are estimated using material properties for both unirradiated and irradiated pressure tube materials. The results are compared with the threshold stress intensity factors required for crack growth due to delayed hydride cracking. (C) 2018 Elsevier B.V. All rights reserved.

【 授权许可】

Free