Abstract
A delayed hydride cracking (DHC) in Zr-2.5 wt % Nb alloy in various structural-phase states at temperatures of 144–283°C using compact specimens for tension tests after a preliminary hydrogenating to 0.0038–0.0072 wt % hydrogen contents was investigated. The temperature dependences and energies of activation of the DHC velocities and spacings between the striations in the hydride crack rupture are determined. Specimens that are characterized by a higher yield strenght and the presence of extended β-Zr phase intermediate layers in the structure have a higher DHC velocity and a smaller interstriation spacing. The obtained results are compared with the previously published data and are considered from the positions of the available DHC theoretical models.
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