In fatigue both monotonic and cyclic plastic zones are formed ahead of the crack tip, inside which the strain history can be studied on the basis of stable hysteresis loops and their development. A 533-B pressure vessel steel was prefatigued to represent the material structure anticipated in the crack-tip process zone and in the area of the maximum tensile stress ahead of the crack tip. With these materials slow strain rate tests were performed both in bulk PWR-environments and in the simulated crack tip environments (MnS-contaminated PWR-water). Environment-sensitive cracking occurred in the simulated crack tip environment at low corrosion potentials, -550…-700 mV(SHE), and in pure PWR-water after anodic polarization to 0.0 mV(SHE).

Subject
Pressure vessels, Crack growth, Corrosion fatigue, Water, Materials, Dislocation, Notches, Crack initiation, Corrosion cracking, Stress cracking, Steel, Corrosion potential, 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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