Susceptibility to stress corrosion cracking (SCC) of candidate materials for the inner container of the multi-barrier nuclear waste package was evaluated by using wedge-loaded precracked double-cantilever-beam (DCB) specimens in deaerated acidic brine (pH ≈ 2.70) at 90°C. Materials tested include Alloys 825, G-30, C-4, 625 and C-22; and Ti Grade-12. Duplicate specimen of each material was loaded at different initial stress intensity factor (KI) values ranging between 23 and 46 ks√in. Both metallography and compliance method were used to determine the final crack length. The final stress intensity for SCC (KISCC) was computed from the measured final wedge load and the average crack length. The results indicate that, in general, the final crack length measured by metallography and compliance was very close to each other, thus, providing very similar KISCC values. While tests are still ongoing, the preliminary results suggest that, compared to other five alloys tested, Alloy 825 may exhibit the maximum tendency to SCC

Subject
Test methods, Crack growth, Materials, Stress intensity, Nickel chromium molybdenum alloys, Stress cracking, Acidity, Crack length, Aluminum alloys, Titanium alloys, Alloys, Cracks, Stress corrosion cracking
Keywords:
Stress corrosion cracking, double-cantilever-beam specimen, nickel-rich and nickel-base alloys, titanium alloy, stress intensity factor
© 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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