ISSN:
1662-9752
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
Mass gain during oxidation, texture and residual stresses in oxide layers onpolycrystalline Armco iron substrates with different surface conditions are investigated usingthermogravimetry microscopy and synchrotron X-rays. The mass gain during oxidation in allsamples follows a parabolic law. The parabolic oxidation constant increases with increasingroughness of a mechanically ground respectively polished oxide layer. Electrolytic polishing (grainsurface etching) reduces while grain boundary etching increases the parabolic oxidation constantcompared to the mechanically polished sample. All oxide layers show columnar growth of themagnetite and a moderate fiber texture. The magnetite contains compressive residual stresses.Under the conditions chosen for the oxidation treatment the magnitude of these compressiveresidual stresses does not depend on the substrate surface condition
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.524-525.963.pdf
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