Abstract
Preferred orientations of hydride platelets formed in seamless Zircaloy tubing were related to the process variables of tubing fabrication. The preferred hydride orientations were described by computer-analyzed frequency distributions of the orientations of individually counted platelets. Nine samples of tubing were studied. Analyses indicated that the hydride orientations in the transverse and longitudinal tubing planes were primarily related to the three-dimensional strain history of fabrication. A new parameter termed the “Directional Strain Parameter” (DεP) was developed to analyze and express fabrication strains. The relationship between DεP and hydride orientation appeared to correlate satisfactorily for rolled plate as well as seamless tubing. The type of fabrication process did not appear to be significant except for its effect on strain history. The mechanism of hydride platelet orientation inferred from these results is discussed.
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