Oxidation behavior of a V-4Cr-4Ti alloy during the commercial processing of thin-wall tubing

A. F. Rowcliffe; D. T. Hoelzer; R. J. Kurtz; C. M. Young

doi:10.1016/j.jnucmat.2007.03.073

Oxidation behavior of a V-4Cr-4Ti alloy during the commercial processing of thin-wall tubing

A. F. Rowcliffe, D. T. Hoelzer, R. J. Kurtz, C. M. Young

Alloy Behavior & Design

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

Because of the high solubility and mobility of oxygen in vanadium, composition control during the fabrication of thin (0.25 mm) wall tubing from vanadium alloys by cold drawing and annealing, presents a technological challenge. During intermediate annealing at 1000 °C in the 10^-4 Torr vacuum regime, oxygen penetration into the tube wall is controlled by the development of a semi-protective surface oxide (linear-parabolic oxidation conditions); oxygen-hardened surface layers lead to a high incidence of surface cracking during the final stages of cold drawing. In the 10^-5 Torr regime, under linear kinetic oxidation conditions, rapid oxygen penetration results in unacceptably high levels of oxygen pick-up (∼1500 wppm). In the 10^-7 Torr vacuum regime, molecular impingement rates are reduced to the point where overall oxygen pick-up is reduced to <100 wppm. Improved cleaning/gettering procedures also restrict carbon and nitrogen pick-up to very low levels.

Original language	English
Pages (from-to)	839-843
Number of pages	5
Journal	Journal of Nuclear Materials
Volume	367-370 A
Issue number	SPEC. ISS.
DOIs	https://doi.org/10.1016/j.jnucmat.2007.03.073
State	Published - Aug 1 2007

Funding

This work was sponsored by the Office of Fusion Energy Sciences, US Department of Energy under Contract DE-AC05-00OR22725 with UT-Battelle and DE-AC06-76RLO1830 with Battelle Memorial Institute. The authors wish to acknowledge the technical support provided by L.T. Gibson and M.J. Gardner.

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title = "Oxidation behavior of a V-4Cr-4Ti alloy during the commercial processing of thin-wall tubing",

abstract = "Because of the high solubility and mobility of oxygen in vanadium, composition control during the fabrication of thin (0.25 mm) wall tubing from vanadium alloys by cold drawing and annealing, presents a technological challenge. During intermediate annealing at 1000 °C in the 10-4 Torr vacuum regime, oxygen penetration into the tube wall is controlled by the development of a semi-protective surface oxide (linear-parabolic oxidation conditions); oxygen-hardened surface layers lead to a high incidence of surface cracking during the final stages of cold drawing. In the 10-5 Torr regime, under linear kinetic oxidation conditions, rapid oxygen penetration results in unacceptably high levels of oxygen pick-up (∼1500 wppm). In the 10-7 Torr vacuum regime, molecular impingement rates are reduced to the point where overall oxygen pick-up is reduced to <100 wppm. Improved cleaning/gettering procedures also restrict carbon and nitrogen pick-up to very low levels.",

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AU - Rowcliffe, A. F.

AU - Hoelzer, D. T.

AU - Kurtz, R. J.

AU - Young, C. M.

PY - 2007/8/1

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N2 - Because of the high solubility and mobility of oxygen in vanadium, composition control during the fabrication of thin (0.25 mm) wall tubing from vanadium alloys by cold drawing and annealing, presents a technological challenge. During intermediate annealing at 1000 °C in the 10-4 Torr vacuum regime, oxygen penetration into the tube wall is controlled by the development of a semi-protective surface oxide (linear-parabolic oxidation conditions); oxygen-hardened surface layers lead to a high incidence of surface cracking during the final stages of cold drawing. In the 10-5 Torr regime, under linear kinetic oxidation conditions, rapid oxygen penetration results in unacceptably high levels of oxygen pick-up (∼1500 wppm). In the 10-7 Torr vacuum regime, molecular impingement rates are reduced to the point where overall oxygen pick-up is reduced to <100 wppm. Improved cleaning/gettering procedures also restrict carbon and nitrogen pick-up to very low levels.

AB - Because of the high solubility and mobility of oxygen in vanadium, composition control during the fabrication of thin (0.25 mm) wall tubing from vanadium alloys by cold drawing and annealing, presents a technological challenge. During intermediate annealing at 1000 °C in the 10-4 Torr vacuum regime, oxygen penetration into the tube wall is controlled by the development of a semi-protective surface oxide (linear-parabolic oxidation conditions); oxygen-hardened surface layers lead to a high incidence of surface cracking during the final stages of cold drawing. In the 10-5 Torr regime, under linear kinetic oxidation conditions, rapid oxygen penetration results in unacceptably high levels of oxygen pick-up (∼1500 wppm). In the 10-7 Torr vacuum regime, molecular impingement rates are reduced to the point where overall oxygen pick-up is reduced to <100 wppm. Improved cleaning/gettering procedures also restrict carbon and nitrogen pick-up to very low levels.

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Oxidation behavior of a V-4Cr-4Ti alloy during the commercial processing of thin-wall tubing

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