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The Application of Analytical Electron Microscopy to Improving the Sensitization Resistance of Type 304 Stainless Steels

Published online by Cambridge University Press:  25 February 2011

H. S. Betrabet  and
W. A. T. Clark
H. S. Betrabet
Affiliation:
The Ohio State University, Department of Metallurgical Engineering, 116 West 19th Avenue, Columbus, Ohio 43210
W. A. T. Clark
Affiliation:
The Ohio State University, Department of Metallurgical Engineering, 116 West 19th Avenue, Columbus, Ohio 43210
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Abstract

The sensitization resistance of austenitic stainless steels can be improved by replacing some of the C with N. Electrochemical potentionkinetic reactivation (EPR) tests indicate that this is effective up to ∼0.16 wt.%N, but that above this level sensitization is enhanced. Thermodynamic calculations indicate that N should continue to reduce sensitization up to at least 0.25 wt.%N, as it retards the growth kinetics of Cr carbides. Analytical electron microscopy was used to investigate this apparent conflict and showed that, while N did decrease the volume diffusion coefficient of Cr beyond 0.16 wt.%, an increase in the amount of discontinuous precipitation of carbides with increasing N was responsible for the sensitization at higher N levels.

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Articles
Information
MRS Online Proceedings Library (OPL) , Volume 62: Symposium Q – Materials Problem Solving with the Transmission Electron Microscope , 1985 , 183
Copyright
Copyright © Materials Research Society 1986

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