Oxidation behavior of V-Cr-Ti alloys in low-partial-pressure oxygen environments

Content Provider	United States Department of Energy Office of Scientific and Technical Information (OSTI.GOV)
Author	Natesan, K. Uz, M.
Organization	Oak Ridge National Lab., TN (United States)
Abstract	A test program is in progress at Argonne National Laboratory to evaluate the effect of pO{sub 2} in the exposure environment on oxygen uptake, scaling kinetics, and scale microstructure in V-Cr-Ti alloys. The data indicate that the oxidation process follows parabolic kinetics in all of the environments used in the present study. From the weight change data, parabolic rate constants were evaluated as a function of temperature and exposure environment. The temperature dependence of the parabolic rate constants was described by an Arrhenius relationship. Activation energy for the oxidation process was fairly constant in the oxygen pressure range of 1 {times} 10{sup {minus}6} to 1 {times} 10{sup {minus}1} torr for both the alloys. The activation energy for oxidation in air was significantly lower than in low-pO{sub 2} environments, and for oxidation in pure O{sub 2} at 760 torr was much lower than in low-pO{sub 2} environments. X-ray diffraction analysis of the specimens showed that VO{sub 2} was the dominant phase in low-pO{sub 2} environments, while V{sub 2}O{sub 5} was dominant in air and in pure oxygen at 76f0 torr.
Related Links	https://www.osti.gov/biblio/330614
Starting Page	73
Ending Page	76
Page Count	4
File Format	PDF
DOI	10.2172/330614
Language	English
Publisher Date	1998-09-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	MATERIALS SCIENCE PLASMA PHYSICS AND FUSION OXIDATION PARTIAL PRESSURE TEMPERATURE DEPENDENCE MICROSTRUCTURE CORROSION PRODUCTS THERMONUCLEAR REACTOR MATERIALS VANADIUM BASE ALLOYS CHROMIUM ALLOYS TITANIUM ALLOYS EXPERIMENTAL DATA
Content Type	Text
Resource Type	Technical Report