It is crucial to obtain reproducible slow strain rate test (SSRT) data when evaluating materials for service. Erratic results can be obtained for nickel-base alloys in high temperature sour environments if important variables are not controlled. This work demonstrates that proper deaeration and axial stressing, without twisting or bending, are important if reproducible results are to be obtained. Although UNS N07716 was used in this work, the principles discussed should apply to a wide range of alloys.

Subject
Test methods, Materials, Valves, Autoclaves, Sour environments, Sodium chloride, Argon, Liquids, Deaeration, Purging, Oxygen, Risk reduction, Stress corrosion cracking
Keywords:
sour environment, autoclave testing, sodium chloride, hydrogen sulfide, carbon dioxide, slow strain rate test, deaeration, axial stressing, nickel-base alloy, Uns N07716
© 1994 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).
1994
Association for Materials Protection and Performance (AMPP)
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