Radiation effects on grain boundary and near grain boundary microchemistries are modeled and compared to measured radiation effects. Nonequilibrium diffusion mechanisms are shown to be consistent with measured phosphorus impurity segregation and measured chromium depletion resulting from irradiation. Radiation-enhanced equilibrium segregation (impurity enrichment) and radiation-enhanced chromium depletion (sensitization) kinetics are predicted to be sufficient to promote equilibrium effects but measurements do not confirm the radiation enhanced mechanisms. Likely causes for the discrepancy are solute trapping and precipitation effects in the matrix promoted by irradiation. Ion and neutron irradiation of austenitic steels are evaluated relative to causes for irradiation-assisted stress corrosion cracking (IASCC).

Subject
Carbides, Fluxes, Diffusion, Chromium, Irradiation, Irradiation assisted stress corrosion cracking, Phosphorus, Vacancies, Kinetics, Defects, Impurities, Nickel, Grain boundary
© 1989 Association for Materials Protection and Performance (AMPP). All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form or by any means (electronic, mechanical, photocopying, recording, or otherwise) without the prior written permission of AMPP. Positions and opinions advanced in this work are those of the author(s) and not necessarily those of AMPP. Responsibility for the content of the work lies solely with the author(s).
1989
Association for Materials Protection and Performance (AMPP)
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