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The Measurement of Stresses within Oxides Produced on Austenitic and Ferritic Steels Using Raman Spectroscopy

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Abstract:

Raman spectroscopy has been used by various workers to provide a measure of the stresses within the oxides grown on metal substrates at high temperatures. In this paper, we consider thermally grown oxides produced on a Type 316 austenitic stainless steel and an iron 3% silicon ferritic steel. The oxides were grown in air at temperatures of 950oC and 650oC respectively over a range of times. These oxides have been characterised by producing cross-sections using focused ion beam milling. The variation of the Raman spectra wave number (He, Ne laser; λ = 633nm) for the oxides produced on the polycrystalline austenitic stainless steel and the ferritic steel were measured as a function of oxide thickness. This shift in wave number was a function of stress. For a fixed oxide thickness on the stainless steel substrate the specimen has been subject to a bending force. A back face strain gauge fixed to the metal substrate provided a measure of the applied strain. The peak wave number varied with applied strain. The results are discussed with respect to the potential to characterise the stresses produced in thermally grown oxides and as a tool to monitor applied stress.

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Periodical:

Materials Science Forum (Volumes 524-525)

Pages:

957-962

DOI:

https://doi.org/10.4028/www.scientific.net/MSF.524-525.957

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Online since:

September 2006

Authors:

Gabrielle Hilson, K.R. Hallam, Peter E.J. Flewitt

Keywords:

Austenitic Steel, Ferritic Steel, Oxidation, Raman Spectroscopy, Residual Stress

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© 2006 Trans Tech Publications Ltd. All Rights Reserved

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