Award Date

1-1-2005

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical Engineering

First Committee Member

Ajit K. Roy

Number of Pages

93

Abstract

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.

Keywords

Applied; Cracking; Potentials; Role; Zircaloy

Controlled Subject

Mechanical engineering

File Format

pdf

File Size

2334.72 KB

Degree Grantor

University of Nevada, Las Vegas

Language

English

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