Doctor of Philosophy (PhD)
First Committee Member
Ajit K. Roy
Number of Pages
Austenitic Alloy C-22 exhibited reduced failure strain (ef) and serrations under tensile loading within susceptible temperature regimes, indicating the occurrence of dynamic-strain-aging (DSA) phenomenon. A maximum dislocation density was observed at 600Ã‚Â°C at which the lowest ef was noted. An average activation energy of 46 kJ/mole was liable for diffusion of solute elements, causing serrations. A maximum work hardening was observed at the slowest strain rate. A slope of 4.0 was determined from crack-growth testing, satisfying the Paris law. A combination of elevated temperature and acidic pH resulted in enhanced cracking tendency. More noble (positive) applied potential led to greater susceptibility to cracking in the acidic solution. The critical potentials became more active (negative) at higher temperatures. The increased wedge-loads caused greater cracking tendency of double-cantilever-beam (DCB) specimens. C-ring and U-bend specimens did not show any cracking in an acidic solution. The cylindrical specimens, used in tensile and environmental-cracking studies, showed ductile failures.
Alloy; Base; Characterization; Corrosion; Crack; Crack Growth; Deformation; Growth; Nickel; Nickel Alloys; Tensile Deformation
Materials science; Materials science
University of Nevada, Las Vegas
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Koripelli, Rama S, "Tensile deformation, corrosion and crack-growth characterization of a nickel-base alloy" (2007). UNLV Retrospective Theses & Dissertations. 2768.