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X-Ray Examination of Type 310S Stainless Steel during its Oxidation in Air at 900°C*

Published online by Cambridge University Press:  06 March 2019

O. Burl Cavin  and
J. S. Wolf
O. Burl Cavin
Affiliation:
Oak Ridge National Laboratory Oak Ridge, TN 37831-6064
J. S. Wolf
Affiliation:
Clemson University Clemson, SC 29634-0921
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Abstract

Type 310S stainless steel was exposed in air at 900°C and simultaneously examined periodically by X-ray diffraction in an attempt to determine the structural evolution of the compounds formed on its surface. The adherent oxide product was found to be a two-layered scale composed of an inner sesquioxide and an outer spinel layer. Both of these compounds exhibited systematic changes in their unit cell sizes as a function of increasing exposure time at constant temperature. The spinel showed an increase in its lattice parameter while the sesquioxide and stainless steel substrate both had decreases in their parameters proportional to the square root of exposure time. In each of the three phases, the rate of change was constant up to approximately four hours after which the parameters approached a limiting value. Evidence also exists for the presence of at least localized stresses in the scales.

Type
VIII. High-Temperature and Non-Ambient Applications of XRD
Information
Advances in X-Ray Analysis , Volume 36: Forty-First Annual Conference on Applications of X-ray Analysis, August 3-7, 1992 , 1992 , pp. 423 - 431
Copyright
Copyright © International Centre for Diffraction Data 1992

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Footnotes

*

Research sponsored by the U. S. Department of Energy, Assistant Secretary for Conservation and Renewable Energy, Office of Transportation Technologies, as part of the High Temperature Materials Laboratory User Program and the AR and TD Fossil Energy Materials Program under contract DE-AC05-84OR21400, managed by Martin Marietta Energy Systems, Inc.

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