Stress corrosion cracking (SCC) behaviors of four austenitic Fe-32Mn-9Al containing approximately 1 wt% carbon alloys were studied in this work. All of the four alloys are susceptible to stress, corrosion cracking in room temperature and 160°C NaCl solution. The SCC can be enhanced by applying anodic potential. The mechanism of SCC is mainly active path corrosion. The crack path is transgranular. The addition of 1.23% Mo or 1.27% Si to the austenitic Fe-32Mn- 9A1 alloy does not change the SCC mechanism and crack path. The addition of 1.27% Si makes the alloy more susceptible to SCC but no such effect was observed with 1.23% Mo. All four alloys studied are susceptible to hydrogen embrittlement in 3.5% NaCl solution at negative enough cathodic applied potential. The addition of Mo, Cr or Si in the alloy displaces the embrittlement potential to a more cathodic range.

Subject
Materials, Intergranular stress corrosion cracking, Anode potential, Secondary cracks, Cathodic potential, Molybdenum alloys, Transgranular stress corrosion cracking, Corrosion cracking, Intergranular cracking, Sodium chloride solution, Defects, Alloys, Stress corrosion cracking
Keywords:
stress corrosion cracking, austenitic Fe-Mn-Al alloy, hydrogen embrittlement, applied potential, transgranular crack, intergranular crack
© 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)
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