Oxidation behavior of V-Cr-Ti alloys in low-partial-pressure oxygen environments [electronic resource]
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| Online Access: |
Online Access |
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| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Oak Ridge, Tenn. : Oak Ridge, Tenn. :
Oak Ridge National Laboratory. ; distributed by the Office of Scientific and Technical Information, U.S. Department of Energy,
1998.
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| Abstract: | A test program is in progress at Argonne National Laboratory to evaluate the effect of pO₂ 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 × 10{sup −6} to 1 × 10{sup −1} torr for both the alloys. The activation energy for oxidation in air was significantly lower than in low-pO₂ environments, and for oxidation in pure O₂ at 760 torr was much lower than in low-pO₂ environments. X-ray diffraction analysis of the specimens showed that VO₂ was the dominant phase in low-pO₂ environments, while V₂O₅ was dominant in air and in pure oxygen at 76f0 torr. |
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| Item Description: | Published through SciTech Connect. 09/01/1998. "doe/er--0313/24" "DE98007433" Natesan, K.; Uz, M. |
| Physical Description: | pp. 73-76 : digital, PDF file. |