Master of Science (MS)
First Committee Member
Ajit K. Roy
Number of Pages
The tensile properties of Waspaloy, a candidate structural material to be used in nuclear hydrogen generation, were evaluated at temperatures up to 1000Ã‚Â°C. The results indicate that this alloy was capable of maintaining appreciably high tensile strength up to 600Ã‚Â°C, followed by a substantial drop beyond this temperature. Between ambient temperature and 300Ã‚Â°C, the failure strain was lowest at 300Ã‚Â°C due to a maximum dislocation density, as determined by transmission electron microscopy. The lowest ductility was, however, observed at 800Ã‚Â°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.
Deformation; Degradation; Environment; High; Induced; Temperature; Waspaloy; Hydrogen
University of Nevada, Las Vegas
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Yelavarthi, Jagadesh K, "High-temperature deformation and environment-induced degradation of Waspaloy" (2006). UNLV Retrospective Theses & Dissertations. 2017.