SYMPOSIA PAPER Published: 01 January 1987
STP25662S

Investigation of Neutron Irradiated Reactor Pressure Vessel Steel by Positron Annihilation and Electron Microscopy

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Positron lifetime, annihilation line shape, and electron microscopic measurements have been carried out on neutron irradiated pressure vessel steel (HSST Plate 03) meeting ASTM A533-B (Unified Numbering System [UNS] K12539). The positron annihilation parameters for specimens irradiated at 423 K to a dose of 1.5 × 1018 n/cm2 are found to decrease sharply during the post-irradiation annealing interval, 473 to 623 K. This correlates well with the stage seen in the recovery of Vickers hardness. On the basis of known evidence for carbon migration in α-iron and the interpretation of present results, enhancement and recovery of radiation hardening have been qualitatively understood in terms of formation and dissolution of carbon decorated vacancy complexes.

Author Information

Sastry Viswanathan, B
Materials Science Laboratory, Indira Gandhi Centre for Atomic Research, Tamil Nadu, India
Pachur, D
Kernforschungsanlage Jülich, Jülich, Federal Republic of Germany
Nandedkar, RV
Materials Science Laboratory, Indira Gandhi Centre for Atomic Research, Tamil Nadu, India
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Developed by Committee: E10
Pages: 369–378
DOI: 10.1520/STP25662S
ISBN-EB: 978-0-8031-5017-1
ISBN-13: 978-0-8031-0963-6