Low frequency fatigue tests at load ratios 0.8 and 0.9 and constant load tests were run on sensitized Type 304 stainless steel (SS), Type 316 nuclear grade SS (316 NG) and the nickel-base Alloy 600 in simulated BWR environments. The environments simulated normal water chemistry (NWC) and hydrogen water chemistry (HWC) with 15 or 5 ppb O2, clean or with sulfate. Oxygen enhanced cracking of Type 304 SS and Alloy 600 but not Type 316 NG under fatigue load conditions. Under constant load conditions crack propagation was always very low in clean environments. Sulfate enhanced cracking in all three materials, most in Type 304 SS and least in Type 316 NG. Crack enhancement due to 0.1 ppm sulfate was worse under constant load than under fatigue load conditions, for Type 304 SS in NWC up to a factor of 100 in constant load and up to a factor of 10 in fatigue.

Subject
Environmental cracking, Constant load, Corrosion fatigue, Intergranular stress corrosion cracking, Stress intensity, Sulfates, Crack propagation, Stress cracking, Intergranular cracking, Impurities, Fatigue, Alloys, Stress corrosion cracking
© 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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