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Characterization of Residual Stresses in Structural Materials for Nuclear Applications

[+] Author Affiliations
Ajit K. Roy, Subhra Bandyopadhyay, Silpa Budugur Suresh

University of Nevada at Las Vegas, Las Vegas, NV

Douglas Wells

Idaho State University, Pocatello, ID

Paper No. PVP2005-71490, pp. 113-118; 6 pages
doi:10.1115/PVP2005-71490
From:
  • ASME 2005 Pressure Vessels and Piping Conference
  • Volume 5: High Pressure Technology, Nondestructive Evaluation, Pipeline Systems, Student Paper Competition
  • Denver, Colorado, USA, July 17–21, 2005
  • Conference Sponsors: Pressure Vessels and Piping Division
  • ISBN: 0-7918-4190-1 | eISBN: 0-7918-3763-7
  • Copyright © 2005 by ASME

abstract

Residual stresses may be generated in target structural material used in accelerator-driven transmutation due to plastic deformation. Nondestructive positron annihilation spectroscopic (PAS) method has been used to estimate residual stresses in candidate structural materials such as martensitic Alloy EP-823 and Alloy HT-9. Different line shape parameters (S, W & T) obtained from the PAS measurements have been related to the degree of cold deformation. The results indicate that the magnitude of S parameter was enhanced at the intermediate level of cold deformation followed by an almost identical S value at the highest level of cold reduction. Conversely, the T parameter was reduced at higher level of cold deformation. The evaluation of the cold-worked specimens by transmission electron microscopy revealed the presence of dislocations, as expected.

Copyright © 2005 by ASME

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