Evaluation of residual stresses in electron-beam welded Zr2.5Nb0.9Hf Zircadyne flange mock-up of a reflector vessel beam tube flange

Muránsky, O.; Holden, T. M.; Kirstein, O.; James, J. A.; Paradowska, A. M. and Edwards, L. (2013). Evaluation of residual stresses in electron-beam welded Zr2.5Nb0.9Hf Zircadyne flange mock-up of a reflector vessel beam tube flange. Journal of Nuclear Materials, 438(1-3) pp. 154–162.

DOI: https://doi.org/10.1016/j.jnucmat.2013.02.045

URL: http://www.sciencedirect.com/science/article/pii/S...

Abstract

The dual-phase alloy Zr2.5Nb alloy is an important nuclear material,because of its use in current and possible use in future nuclear reactors. It is,however,well-known that Zr2.5Nb weldments can fail through a time-dependent mechanism called delayed hydride cracking which is typically driven bythe presence of tensile residual stresses. With a view to understanding the development of residual stresses associated with Zr2.5Nb welds the current study focuses on the evaluation ofthe residual stresses in a mock-up of a reactor beam tube flange made from Zr2.5Nb0.9Hf. The present results suggests that, like ferritic welds which undergo a solid-state phase transformation upon welding, Zr2.5Nb0.9Hf welds also develop high tensile residual stresses in the heat-affected zone whereas the stresses closer to the weld tip are reduced by the effects of the β → α solid-state phase transformation.

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