This study was undertaken to better define the effects of hydrogen absorption on the ductility of alloy UNS N05500. Samples were cathodically charged with hydrogen followed by slow strain rate tensile testing. The samples consisted of forged rods and one piece of cold rolled strip. For comparison, alloy UNS N07718 was also tested in rod and strip form.

Tensile strength increased as a function of charging time (1-15 days) and the ductility clearly dropped as measured by percent loss in elongation. Strip material was more susceptible to hydrogen embrittlement than the rod specimens for both materials. The degree of ductility loss for the UNS N07718 alloy was clearly less than the UNS N05500 alloy.

Finally, a series of tests were conducted to measure the galvanic corrosion potential between alloy UNS N05500 and carbon steel in a 0.1 N NaCl solution at 77 F (25 C) and 176 F (80 C) purged with carbon dioxide (CO2) and a second series purged with air.

Subject
Hydrogen embrittlement, Corrosion failures, Materials, Nickel based alloys, Sodium chloride, Free corrosion potential, Density, Corrosion losses, Film formation, Steel, Alloys, Ductility, Hydrogen
© 1988 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).
1988
Association for Materials Protection and Performance (AMPP)
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