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:
It is shown from the oxidation results that, for Fe-Cr, Ni-Cr, Co-Cr binary alloys with andwithout internal Cr2O3 precipitations after exposure, continuous external Cr2O3 scales formed ontheir surfaces, especially at the initial stage. It is therefore suggested that the transitions of oxidationfor these alloys take place from externally to internally. There are two types of transitions for alloys:(1) the transition from temporary external oxidation to internal oxidation; and (2) the transition frompermanent external oxidation to internal oxidation. The thermodynamic conditions for thesetransitions have been analyzed, and the criterion for prediction of the minimum solute concentrationof a binary solid solution alloy required for the second transition has been derived. It is alsosuggested that the external oxide scale is an important factor to determine the formation of puresolvent metal nodules on the surfaces
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/02/13/transtech_doi~10.4028%252Fwww.scientific.net%252FMSF.522-523.45.pdf
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