| Numéro |
J. Phys. Colloques
Volume 48, Numéro C6, Novembre 1987
34th International Field Emission Symposium / 34ème Symposium International d'Emission de Champ
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| Page(s) | C6-423 - C6-428 | |
| DOI | https://doi.org/10.1051/jphyscol:1987669 | |
34th International Field Emission Symposium / 34ème Symposium International d'Emission de Champ
J. Phys. Colloques 48 (1987) C6-423-C6-428
DOI: 10.1051/jphyscol:1987669
1 Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6376, U.S.A.
2 Department of Materials Science and Engineering, University of Florida, Gainsville, FL 32611, U.S.A.
3 Materials Engineering Associates, Inc., Lanham, MD 20706, U.S.A.
4 Westinghouse R & D Center, Pittsburgh, PA 15235, U.S.A.
J. Phys. Colloques 48 (1987) C6-423-C6-428
DOI: 10.1051/jphyscol:1987669
CHARACTERIZATION OF IRRADIATED MODEL PRESSURE VESSEL STEELS
M.K. Miller1, D.T. Hoelzer2, F. Ebrahimi2, J .R. Hawthorne3 et M.G. Burke41 Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831-6376, U.S.A.
2 Department of Materials Science and Engineering, University of Florida, Gainsville, FL 32611, U.S.A.
3 Materials Engineering Associates, Inc., Lanham, MD 20706, U.S.A.
4 Westinghouse R & D Center, Pittsburgh, PA 15235, U.S.A.
Abstract
The microstructure of model pressure vessel steels has been characterized after neutron irradiation and thermal aging by atom probe field-ion microscopy. A high density of small, roughly spherical or disc shaped copper clusters/precipitates were observed in the neutron irradiated alloys that contained copper. Small spherical phosphorus clusters were observed in the irradiated copper-free alloys, and copper phosphides were observed in a high phosphorus Fe-Cu-Ni-P alloy. None of these clusters/precipitates were observed in the thermally aged materials. The increases in the tensile and yield strengths that were observed after neutron irradiation resulted from the formation of these clusters and other lattice defects.