Existing capabilities to quantitatively model carbide precipitation and sensitization development in austenitic stainless steels are assessed and critically analyzed. A theoretically-based, empirically-modified model is described which predicts carbide nucleation kinetics, chromium depletion characteristics and material degree of sensitization (DOS) as measured by the electrochemical potentiokinetic reactivation (EPR) test. Individual model components are validated by correlation to the available data base including direct comparisons to grain boundary chromium depletion. Model is shown to quantitatively predict isothermal sensitization development in a large number of commercial Type 304 and 316 stainless steel heats. This work represents a first step to evolve methods that realistically assess microstructural characteristics and structural reliability in stainless steel components and weldments.

Subject
Materials, Carbides, Thermodynamics, Precipitation (solids), Composition, Chromium, Nucleation, Experimental data, Heat, Sensitization, Carbon, Stainless steel, Grain boundary
© 1989 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).
1989
Association for Materials Protection and Performance (AMPP)
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