Abstract
The effect of radial hydride on the room temperature fracture toughness of the Zr-2.5Nb pressure tube material with 100% radial hydrides and hydrogen content up to 320wppm was investigated using curved compact tension (CCT) specimens. The hydride continuity coefficients (HCC) representing hydrogen content and hydride orientation were determined between 0 and 1. It was observed that the role of plastic deformation on the fracture toughness mechanism decreases with increase in HCC. On a semi-log scale the fracture toughness of the Zr-2.5Nb pressure tube varied linearly with HCC at room temperature and this is characteristic feature for the Zirconium alloys.
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