The polythionic acid stress corrosion cracking (PA-SCC) susceptibility was determined for welded and unwelded heat and corrosion-resistant alloys, both with and without thermal stabilization. The thermal effects of welding produced only a slight decrease in the PA-SCC resistance of alloys in the solution annealed condition, but counteracted the benefits of thermal stabilization for these materials. Thermal stabilization provided complete PA-SCC resistance for Types 321H (Ti/C - 6.8) and 347 (Nb/C = 12.0) stainless steels. Subsequent welding destroyed this resistance within the portion of the heat affected zone exposed to a peak temperature near the titanium or niobium carbide dissolution temperature. The PA-SCC resistance of Alloy 601 (Ti/C = 9.5) was significantly improved by thermal stabilization, while Alloy 800H (Ti/C = 5.0) exhibited only slight improvement.

Subject
Materials, Stainless alloys, Nickel based alloys, Steel coupons, Welding, Metal coupons, Heat, Sensitization, Titanium, Stainless steel, Titanium alloys, Grain boundary, Alloys
Keywords:
polythionic acid, sensitization, stainless steels, nickel alloys, stress corrosion cracking
© 1993 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).
1993
Association for Materials Protection and Performance (AMPP)
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