This paper presents the failure analysis of a high pressure hydrogen vessel operating in cryogenic service that failed instantaneously along the fusion line of a dissimilar metal weld. Failure was attributed to sulfide stress cracking (SSC) of the hard fusion line that developed after welding the 3-1/2 Ni steel plate with an austenitic stainless steel filler metal.

Subject
Filler metals, Microstructure, Fracture surfaces, Base metals, Mechanical failure, Steel, Sulfide stress cracking, Fracture, Dissimilar metals, Weld metal, Stress corrosion cracking, Hydrogen, Martensite
Keywords:
hydrogen sulfide, sulfide stress cracking, dissimiliar metal welds, hydrogen
© 1991 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).
1991
Association for Materials Protection and Performance (AMPP)
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