University of Nevada, Las Vegas
Las Vegas (Nev.)
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Metals and alloys, when subjected to tensile loading beyond a limiting value, can undergo plastic deformation resulting in lattice defects such as voids and dislocations. These imperfections may interact with the crystal lattice, producing a higher state of internal stresses characterized by reduced ductility. Residual stresses can also be generated in welded structures due to rapid rate of solidification, and dissimilar metallurgical microstructures between the weld and the base metals. Premature failures can be experienced in engineering metals and alloys due to the presence of these residual stresses. Specific thermal treatments commonly known as stress relief operations can relieve these internal stresses.
This project is focused on the evaluation of residual stresses by the state-of-the-art destructive and non-destructive techniques. In addition, microstructural evaluations have also been performed by metallographic techniques. Future work will involve residual stress measurements on components, deformed plastically and subsequently irradiated. Further, the effect of postweld- thermal-treatment on the resultant internal stresses will also be evaluated.
Austenitic stainless steel; Deformations (Mechanics); Martensitic stainless steel; Nuclear reactors — Materials — Testing; Plasticity; Strains and stresses
Austenitic stainless steel; Martensitic stainless steel; Nuclear reactors--Materials--Testing
Materials Science and Engineering | Metallurgy | Nuclear Engineering | Oil, Gas, and Energy
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Roy, A. K.
Use of Positron Annihilation Spectroscopy for Stress-Strain Measurements.
Available at: https://digitalscholarship.unlv.edu/hrc_trp_sciences_materials/115