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The effects of b and zr on the creep and fatigue crack growth behavior of a Ni-base superalloy

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Abstract

The effects of 0.006 wt pct B and/or 0.05 wt pct Zr on the 650 °C creep and fatigue properties of a nickel-base superalloy were evaluated. Additions of B and Zr markedly improved the smooth specimen creep properties and the threshold stress intensity values for creep crack growth. The additions had no effect on the crack growth rates in creep or fatigue. No changes in microstructure, fracture appearance, or grain boundary sliding behavior due to B and Zr could be seen. The benefits of B and Zr were much greater in tests in air than in helium, and the primary effect of these additions was to minimize the harmful effects of oxygen. The general results can be explained by postulating that B and Zr minimize the deleterious change in interfacial energy caused by oxygen, but a clearer understanding of the nature of creep threshold values is needed. S. FLOREEN,, and J. M. DAVIDSON,, are both with

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Authors and Affiliations

  1. Inco Alloy Products Company Research Center, Sterling Forest, 10901, NY, Suffern

    S. Floreen (earch Fellow) & J. M. Davidson (earch Metallurgist)

Authors
  1. S. Floreen
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  2. J. M. Davidson
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Floreen, S., Davidson, J.M. The effects of b and zr on the creep and fatigue crack growth behavior of a Ni-base superalloy. Metall Trans A 14, 895–901 (1983). https://doi.org/10.1007/BF02644294

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  • DOI: https://doi.org/10.1007/BF02644294

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