The stress corrosion cracking (SCC) behavior of differently heat treated specimens of Inconel 600 in boiling 25 molal NaOH solution has been studied as a function of potential by using the slow strain rate technique. Three distinct anodic potential regions of cracking were identified for mill-annealed specimens on the basis of failure mode and fracture area ratio measurement. IGSCC was observed within the primary passive potential region, while TGSCC was obtained at the open circuit potential and within the secondary passive region. Heat treatment at 700°C reduced the susceptibility to either IGSCC or TGSCC (at the open circuit potential). Also, material with small grain size exhibited better resistance to IGSCC. Electrochemical and metallurgical aspects relevant to the SCC behavior were also studied. It was concluded that the beneficial effect of heat treatment might be due to intragranular precipitation of chromium carbides which affect the slip behavior by acting as barriers to moving dislocations.

Subject
Grain size, Intergranular stress corrosion cracking, Anode potential, Precipitates, Nickel based alloys, Transgranular stress corrosion cracking, Open circuits, Intergranular cracking, Heat, Grain boundary, Heat treatment, Primary passive potential, Stress corrosion cracking
© 1982 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).
1982
Association for Materials Protection and Performance (AMPP)
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