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The effects of oxygen concentration and temperature on cyclic creep in niobium-oxygen alloys

  • Machanical Behavior
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Abstract

The effects of dynamic solute-dislocation interactions on cyclic creep in niobium-oxygen alloys have been examined by comparing static and cyclic creep in the dynamic strain-aging temperature range. In all comparisons, the peak stress in cyclic creep tests was identical to the constant stress in static creep tests.

Niobium purified of interstitial solutes exhibits classical logarithmic creep at these temperatures under both static and cyclic loading. Alloying with oxygen in solid solution promotes dynamic strain-aging effects under both static and cyclic loading, as indicated by incubation periods and the discontinuous cessation of creep.

Reflecting the large contribution of the initial strain, the total accumulated strains observed for static and cyclic creep were virtually identical at all temperatures and oxygen concentrations investigated. Because the initial strain observed under static loading was distributed over several cycles under cyclic loading, it appeared that cyclic creep acceleration occurred early in the tests. However, comparing creep rates at identical strains rather than elapsed times demonstrated that the rate of cyclic creep was slightly less than the static creep rate with the following exception. At 295 K, cyclic creep acceleration that is independent of solute concentration was observed.

The observations are considered as manifestations of classical dynamic strain aging behavior.

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Authors and Affiliations

  1. Department of Metallurgy and Mining Engineering, University of Illinois, 61801, Urbana, IL

    R. A. Yeske (Assistant Professor)

Authors
  1. G. P. Sheldon
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  2. R. A. Yeske
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Formerly Graduate Research Assistant, University of Illinois, is now Metallurgist, Southwest Research Institute, San Antonio, TX 78201.

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Sheldon, G.P., Yeske, R.A. The effects of oxygen concentration and temperature on cyclic creep in niobium-oxygen alloys. Metall Trans A 9, 5–12 (1978). https://doi.org/10.1007/BF02647164

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  • DOI: https://doi.org/10.1007/BF02647164

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