Master of Science (MS)
First Committee Member
Ajit K. Roy
Number of Pages
Consistent with the earlier observation, this investigation revealed that Zircaloy-2 (Zr-2) may exhibit enhanced ductility at elevated temperature when tested under the combined effect of applied stress and an acidic environment. Since the cracking susceptibility of Zr-2 may be influenced by applied potentials, SCC tests were performed in a similar environment under cathodic and anodic controlled potentials (Econt). While the effect of cathodic Econt was insignificant, Zr-2 exhibited enhanced cracking susceptibility when tested under an anodic Econt. The localized corrosion study using cyclic polarization indicates that the critical potentials became more active with increasing temperature. Secondary cracks were noted in a specimen tested under an anodic Econt, as determined by optical microscopy. The primary fracture surface of the same specimen examined by scanning electron microscope (SEM) revealed combined intergranular and transgranular cracks. However, all other specimens were characterized by dimpled microstructures indicating ductile failure.
Applied; Cracking; Potentials; Role; Zircaloy
University of Nevada, Las Vegas
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Valliyil, Unnikrishnan, "The role of applied potentials on cracking of Zircaloy-2" (2005). UNLV Retrospective Theses & Dissertations. 1859.