The high-temperature oxidation behavior of chromia-forming alloys is significantly influenced by the presence of silicon additions, particularly under thermal cycling conditions. This paper compares and analyzes the cyclic oxidation resistance of the low-silicon alloy N08811 (0.15 wt% Si) and the high-silicon alloys N06045 (2.66 wt% Si), N12160 (2.75 wt% Si) and D-205 (5.3 wt% Si). Oxidation testing was conducted at 1000°C in still air and the specific aspects studied were scale spallation resistance, nature by which the silicon oxidized, and the influence of silicon on the subsurface depletion of chromium. The N08811 alloy performed the worst, undergoing rapid weight-loss kinetics after a period of relatively protective oxidation. The N06045 alloy exhibited the best oxidation resistance, which was believed to be due in part to the formation of a fine distribution of silica precipitates in the vicinity of the alloy/scale interface.

Subject
Oxidation resistance, Chromium, Oxidation behavior, Metal oxides, Silica, Commercial alloys, Silicon, Interfaces, Scale formation, Scale, Titanium alloys, Alloys, Oxidation
Keywords:
chromia-former, cyclic oxidation, silicon effect, scale spallation, chromium depletion
© 2002 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).
2002
Association for Materials Protection and Performance (AMPP)
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