University of Nevada, Las Vegas
Las Vegas (Nev.)
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Highlights of Test Results:
• Residual stress measurements by the RC method on cold-worked specimens showed tensile residual stresses in austenitic stainless steel. However, compressive residual stresses were observed in martensitic stainless steel. This difference may be attributed to the difference in metallurgical phases and microstructures resulting from different thermal treatments imparted to them.
• Residual stress measurements by both ND and RC techniques on welded specimens showed similar patterns. Welded specimens consisting of similar material showed tensile residual stresses in the vicinity of the fusion line (FL). However, welded specimens consisting of dissimilar materials (austenitic and martensitic stainless steel on opposite side) showed a different pattern, in that residual stresses were compressive near the FL on the martensitic stainless steel side as opposed to tensile residual stresses on austenitic stainless steel side of the same specimen.
• The measurements of residual stresses by the PAS technique revealed a reduction in Tparameter with the increased plastic deformation for both austenitic and martensitic stainless steels. A reduced T-parameter indicates enhanced residual stresses in either Alloy.
• One graduate student performed PAS measurements on welded specimens consisting of both similar and dissimilar materials at Idaho State University (ISU) during the summer of 2004. Also, tensile test specimens were subjected to the activation process using ISU accelerator to develop calibration curves. Data analyses are ongoing.
• Several papers, based on recent data, were presented in technical society meetings. Some of these papers are currently under review for publication in technical journals.
• Significant progress has been made to characterize residual stresses in terms of dislocation density by using TEM.
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: Quarterly Progress Report (June 01 – August 31, 2004).
Available at: https://digitalscholarship.unlv.edu/hrc_trp_sciences_materials/109