Scanning transmission electron microscopy (STEM) analyses, in-reactor swelling mandrel tests, and laboratory constant extension rate tensile (CERT) tests were conducted on nine custom Type 348SS alloys, in an attempt to correlate grain boundary composition with IASCC resistance. Phosphorus enrichment showed the best correlation with in-reactor test results, and Cr depletion the best correlation with laboratory results. Silicon and P enrichment were found to be quantitatively dependent on the bulk concentrations of these elements, while the amount of Cr depletion seemed to be at least partially dependent on the amounts of Si and/or P enrichment. Silicon and P enrichment and Cr depletion are suppressed by higher C contents, such as that present in CP Type 348SS.

Subject
Materials, Intergranular stress corrosion cracking, Stainless alloys, Correlation, Irradiation assisted stress corrosion cracking, Phosphorus, Commercial alloys, Swelling, Stainless steel, Elements, Grain boundary, Alloys, Test specimen
Keywords:
STEM, swelling mandrel tests, CERT tests, Type 348SS, IASCC, Penrichment, Si enrichment, Cr depletion
© 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)
You do not currently have access to this content.