Award Date

1-1-2006

Degree Type

Thesis

Degree Name

Master of Science (MS)

Department

Mechanical Engineering

First Committee Member

Ajit K. Roy

Number of Pages

116

Abstract

The tensile properties of Waspaloy, a candidate structural material to be used in nuclear hydrogen generation, were evaluated at temperatures up to 1000°C. The results indicate that this alloy was capable of maintaining appreciably high tensile strength up to 600°C, followed by a substantial drop beyond this temperature. Between ambient temperature and 300°C, the failure strain was lowest at 300°C due to a maximum dislocation density, as determined by transmission electron microscopy. The lowest ductility was, however, observed at 800°C, possibly due to the formation of brittle sigma phase. The cracking susceptibility of Waspaloy in an acidic solution was enhanced at a higher temperature when tested by the slow strain rate (SSR) technique. Slight variations in ductility parameters, true failure stress and time to failure were observed under anodic controlled potentials in SSR testing. The magnitudes of critical potentials, determined by an electrochemical method, became more active (negative) with increasing temperature. The general corrosion rate was gradually reduced with the longer exposure period. Combinations of ductile and brittle failures were observed depending on the testing temperature.

Keywords

Deformation; Degradation; Environment; High; Induced; Temperature; Waspaloy; Hydrogen

Controlled Subject

Materials science

File Format

pdf

File Size

3952.64 KB

Degree Grantor

University of Nevada, Las Vegas

Language

English

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