Hostname: page-component-77c89778f8-gvh9x Total loading time: 0 Render date: 2024-07-20T01:31:31.148Z Has data issue: false hasContentIssue false

Neutron Damage in Reactor Pressure-Vessel Steel Examined with Positron Annihilation Lifetime Spectroscopy

Published online by Cambridge University Press:  15 February 2011

Stephen E. Cumblidge
Affiliation:
Nuclear Engineering Dept., The Pennsylvania State University, University Park, PA, USA
Arthur T. Motta
Affiliation:
Nuclear Engineering Dept., The Pennsylvania State University, University Park, PA, USA
Gary L. Catchen
Affiliation:
Nuclear Engineering Dept., The Pennsylvania State University, University Park, PA, USA
Get access

Abstract

We have used positron annihilation lifetime spectroscopy to study the development of damage and annealing behavior of neutron-irradiated reactor pressure-vessel steels. We irradiated samples of ASTM A508 nuclear reactor pressure-vessel steel to fast neutron 172 fluences of up to 1017 n/cm2, and we examined these samples using positron annihilation lifetime spectroscopy (PALS) to study the effects of neutron damage in the steels on positron lifetimes. Non-irradiated samples show two positron lifetimes: a 110 ps component corresponding to annihilations in the bulk material, and a 165 ps lifetime corresponding to annihilations in dislocation defects. The irradiated samples show an additional lifetime component of 300 ps in the PAL spectra and an increase in the proportion of annihilations with a 165 ps lifetime, suggesting that vacancies and vacancy clusters are present in the material after room temperature irradiation. The samples were then annealed to temperatures ranging from 210° C to 450° C. The positron lifetimes introduced by neutron damage disappear after annealing the samples at 280° C.

Type
Research Article
Copyright
Copyright © Materials Research Society 1997

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

[1] Jean, Y.C., Positron and Positronium Chemistry, World Scientific, Singapore (1990)Google Scholar
[2] Berko, S. and Weisenburg, H., Physical Review B 154 (2) (1967) 249 Google Scholar
[3] Kirkegaard, P., Eldrup, M., Mogensen, O. E., and Pedersen, N. J., Comput. Phys. Commun. 23 (1981) 307 Google Scholar
[4] Birringer, H. E., Wurschum, R., Birringer, R., and Gleiter, H., Phys.Rev.B, 38 (14) (1998) 37 Google Scholar
[5] Brauer, G., Liszakay, L., Molnar, B., and Krause, R., Nuc. Eng. Des. 127 (1991) 4768 Google Scholar
[6] Brauer, G., Journal de Physique IV (5) Jan. (1995) C1 143 Google Scholar
[7] Schultz, P. J. and Snead, C. L. Jr., Metallurgical Transactions A (1990) 21 Google Scholar