Doctor of Philosophy (PhD)
First Committee Member
Ajit K. Roy
Number of Pages
Austenitic nickel-base Alloy 617 has been tested under tensile loading at temperatures relevant to both the Nuclear Hydrogen Initiative and the Next Generation Nuclear Plant programs of the U.S. Department of Energy. Two important metallurgical phenomena, namely dynamic strain aging (DSA) and yield strength anomaly (YSA), have been identified based on the resultant data. DSA was characterized by reduced plastic strain and serrations in the engineering stress versus engineering strain diagrams. YSA was manifested by enhanced yield strength at relatively higher temperatures. A mechanistic understanding of DSA and YSA phenomena has been developed based on the estimation of dislocation density, activation energy, work-hardening index and precipitate morphology, where applicable. Stress-intensity-factor and crack-growth-rates of this alloy have been evaluated with and without the presence of an acidic solution at different temperatures using fracture-mechanics-based principles. Fractographic evaluations of all tested specimens have also been performed to characterize the extent and morphology of failures resulting from different modes of loaDing
Alloy; Crack; Crack Propagation; Deformation; Dynamic Strain Aging; Fracture Toughness
Mechanical engineering; Materials science; Materials science
University of Nevada, Las Vegas
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Marthandam, Vikram, "Tensile deformation, toughness and crack propagation studies of alloy 617" (2007). UNLV Retrospective Theses & Dissertations. 2792.
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