Post-irradiation annealing effects on the thermal sensitization and IASCC recovery for highly irradiated types 304 and 316L stainless steels were investigated using EPR and SSR tests.

Irradiated type 316L stainless steel (neutron fluence: 8x1025 n/m2, E>1MeV) was not sensitized and IGSCC susceptibility significantly was reduced to 7-0% at 400-700°C(x1h) from 23% at as-irradiated condition. Irradiated type 304 stainless steel (neutron fluence: 1.2x1026 n/m2, E>1MeV) was more easily sensitized than unirradiated material and IGSCC susuceptibility was reduced to 62-45% at 400-500°C from 95% at the as-irradiated condition. These results on types 304 and 316L stainless steels indicated that the thermal healing technic enhanced IASCC recovery.

Subject
Materials, Piping, Intergranular stress corrosion cracking, Dislocation, Diffusion, Welding, Inspection, Irradiation assisted stress corrosion cracking, Surface morphology, Sensitization, Stainless steel, Fracture, Annealing
Keywords:
stainless steel, irradiation-assisted stress corrosion (IASCC), post-irradiation annealing, thermal sensitization, EPR tests, IGSCC, light water reactor
© 1998 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).
1998
Association for Materials Protection and Performance (AMPP)
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