The critical stress for the initiation of stress corrosion cracking (SCC) of a corrosion resistant alloy in sour environments is investigated with various stress application techniques: a constant strain type, a constant load type, and slow strain rate technique. The critical stress for micro- and macroscopic cracks was determined for three types of SCC tests by detailed observation for alloy surface after SCC tests. The critical stresses for SCC initiation thus determined agreed well with each other, when a newly proposed index σc was adopted for slow strain rate test results and cracks were carefully examined.

The effect of cold work on corrosion resistance of a duplex stainless steel was also studied with various stress application techniques. It was found that cold work did not deteriorate the corrosion resistance of duplex stainless steel when SCC behaviors were controlled by pitting initiation. The critical stress as influenced by cold work is also discussed in relation to mechanical deformation behaviors of the materials, especially the general yielding.

Subject
Pits, Constant load, Materials, Sour environments, Microcracks, Nucleation, Crack initiation, Stress cracking, Stress, Corrosion resistance, Risk reduction, Cold working, 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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