The effect of testing direction on DHC growth rate using a Zr-2.5Nb plate
36th Annual CNS-CNA Student Conference - 2012 June 12

Presented at:
36th Annual CNS-CNA Student Conference
2012 June 12
Saskatoon, Canada
Session Title:
CNS/CNA Student Conference 2012

Sean Hanlon (Carleton University )
Scott Read (Carleton University )
Alain Douchant (Atomic Energy of Canada Limited (AECL) )
Mona Primeau (AECL )
Ken Kidd (AECL )
Patrick Wilson (AECL )
Glenn McRae (Carleton University )
Christopher Coleman (AECL )


Delayed Hydride Cracking (DHC) is a fracture mechanism responsible for several failures of zirconium alloy components. These components have anisotropic grain structure due to extrusion and heat treatment. Disk shaped hydrides preferentially form on certain planes, thus giving rise to orientation of bulk hydrides that are hypothesized to slow crack growth rates depending on the relative direction of the cracking. This hypothesis suggests that no difference in crack velocities will be observed upon cooling to temperatures above the terminal solid solubility for precipitation (TSSP) for hydrogen because there will be no hydrides in the bulk, but that the velocities will begin to diverge at lower temperatures as oriented hydrides interfere more-or-less depending on the relative direction of crack propagation. By extension, comparing crack velocities in different directions can be used to determine TSSP directly from DHC experiments. Cantilever beam samples from a Zr-2.5Nb plate with pressure tube structure were used to produce plots to estimate TSSP.

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